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The Oracle Certification software is still essentially the most well-known certification among complete database carriers. here's no flabbergast due to the fact Oracle has dominated the marketplace for tremendous scale relational databases international. Oracle has absolutely revamped the DBA Certification song with the free up of the Oralce9i database. To most desirable remember the changes that the DBA music has undergone, it's gold criterion to first assessment the Oracle8i DBA music.
To circle into an Oracle8i certified professional (OCP) DBA, the certification candidate crucial to current five exams:
Passing complete 5 assessments changed into a very challenging project, to assert the very least. the primary two checks within the track acquire been regularly regarded to be among the hardest...as mastery of their content become elementary in passing checks 3 and 4. The network Administration exam turned into an entity of its own, containing content material a worthy deal diverse than the others...despite the fact extraordinarily essential for the DBA to operate his or her tasks.
With Oracle9i, the DBA Certification music is now divided into 2 simple tiers, as well as a 3rd master-degree tier:
The core Oracle9i DBA track includes 4 tests: 2 for OCA, and an further 2 for OCP.
Oracle9i licensed affiliate (OCA)
The OCA tier become designed to give for an entry-degree DBA certification designation for the Oracle9i platform. tips technology authorities with Little or no Oracle journey can gain the potential and skills fundamental to destroy into the totally lucrative and difficult Oracle profession. The competencies got from completing this certification music will allow the candidate to grasp Part on Oracle-linked initiatives acting as junior-level DBAs. customarily, a senior-stage DBA will work closely to allocate usurp DBA initiatives to enhance present knowledge, and problem them to be trained sort of greater superior procedures.
The Oracle9i certified associate (OCA) requires passing two tests:
Oracle9i licensed skilled (OCP)
The OCP tier became designed for mid to senior-degree DBAs with one or extra years of focused Oracle DBA adventure. The capabilities and abilities bought from completing this tier of the certification software build together the DBA to supply the entire assortment of DBA-related initiatives...from Database Design and edifice to construction tasks corresponding to efficiency Tuning and Backup & restoration.
The Oracle9i licensed skilled (OCP) requires passing both checks within the OCA Tier, plus two extra exams:
note: it's also feasible to circle into an Oracle9i licensed professional (OCP) by taking one exam: Oracle9i: current elements for administrators. To qualify to become an OCP by means of taking this one "improve" examination, you requisite to first be an Oracle8i certified skilled (OCP).
Oracle9i certified master (OCM)
there's a 3rd tier to the Oracle9i DBA Certification song, the OCM. This song is targeted at very senior degree DBAs and Oracle consultants. if in case you acquire lower than 5 years of worthy Oracle work event...and haven't spent many hours working with and testing advanced Oracle9i features...don't even accept as genuine with this Tier as an choice. I conclude not imply to sound negative about this, however let me continue with extra on the necessities...and optimistically you are going to espy what I mean.
The OCM designation first requires that you acquire your Oracle9i OCP credential. once here is secured, Oracle requires that you grasp two advanced Oracle lessons from Oracle university. These are teacher-led classes so as to permeate on medium $2,000 every. There are a couple of dozen diverse courses to Make a election from:
when you've accomplished the direction requirements, you can then register for and grasp the "practicum" examination. The practicum is a two-day, palms-on efficiency examination that requires the candidate to achieve a couple of initiatives the usage of Oracle9i on the Linux platform. one of the crucial skills that should be confirmed encompass: database configuration, replication, partitioning, parallel operations, diagnostics, troubleshooting, performance tuning, and backup and healing...all with "precise-world" scenarios.
So, what's the problem with that you simply may additionally ask? First, the competencies you are going to deserve to comprehend and be able to achieve are covered in many greater than just two of the superior lessons you'll be required to grasp from Oracle university. So however you conclude grasp both required classes, you'll should be trained and be prepared for a righteous deal extra. This may require many months of extra self-analyze or many thousands of dollars in extra Oracle school courses. second, the cost of the practicum exam is an outrageous $2,000. You might not wish to fail and re-take (re-pay) for this examination!!
do not Get me wrong, i esteem the concept of a master-stage Oracle certification, however the direction requirements and examination permeate Make this Tier can charge-prohibitive for many.
continued in Part II.For more assistance
At MariaDB Corp's user and developer conference MariaDB OpenWorks in immense apple's economic District, MariaDB CEO Michael Howard pulled no punches at his enterprise's opponents: immense cloud, principally Amazon net features (AWS) and Oracle. Howard opened with announcing big proprietary cloud acquire been "strip-mining open-supply technologies and organizations," he continued on the storm from there.
"These groups, he persisted, "You recognize they are -- are definitely abusing the license and privilege [of open source], via no longer giving back to the neighborhood." The MariaDB database management gear (DBMS), complete started as a MySQL fork. these days, with its heart nonetheless licensed beneath the GPLv2, Sanjeev Mohan, a Gartner analysis Director, called MariaDB "the gold ordinary for enterprise open-source DBMSs."
Howard persisted, "We confidence proprietary and closed licenses are dead. They believe you requisite to be a standard-aim database and not a relegated niche one, dote -- and nothing towards it -- time series. it is no longer going to be a universal goal database if you want to drive functions worldwide." MariaDB is any such database.
whilst MariaDB grows with the aid of leaps and bounds in business computing at Oracle's price, Howard sees Oracle and Amazon fighting in opposition t it. "Oracle because the illustration of on-premise lock-in and Amazon being the sample of cloud lock-in. You might interchange the names, which you could honestly lisp now that Amazon should simply be known as Oracle prime."
Howard is rarely complete that worried about Oracle. they acquire been competing against Oracle considering that day one. Ever on account that MariaDB built an Oracle compatibility layer, which includes Oracle Database facts types, sequences and PL/SQL syntax, into its MariaDB commercial enterprise Server final might also, MariaDB has been winning customers over from Oracle at an unparalleled price. With it, Howard mentioned, "Now, that you can migrate complicated operational Oracle programs to MariaDB. terminal year, they had one of the most largest banks -- edifice pecuniary institution of Singapore -- on the planet forklift from Oracle to MariaDB" given that then, MariaDB has considered 5 instances the number of Oracle migrations happening over the ultimate year."
AWS, well, it really is an additional weigh number.must read
in the first keynote, Austin Rutherford, MariaDB's VP of customer Success, showed the result of a HammerDB benchmark on AWS EC2. HammerDB is the main enterprise DBMS benchmarking and load testing software. In these tests, AWS's default MariaDB circumstances did poorly, while AWS homebrew Aurora, which is developed on accurate of MySQL, at complete times beat them. The properly-performing DBMS of complete was MariaDB Managed functions on AWS.
AWS Aurora readily distances AWS's MariaDB instances, but the fastest of complete is MariaDB Managed capabilities.MariaDB
"My first reaction after I appeared at the benchmarks," spoke of Howard, turned into "might be there may be incompetence occurring. possibly they simply don't know the artery to optimize a DBMS." He followed that one MariaDB customer, one of the biggest retail drug businesses on the planet, had informed MariaDB that "Amazon presents probably the most vanilla MariaDB around. there may be nothing business about it. They may just install MariaDB from source on EC2 and conclude as well."
He than "begun to wonder, Is there anything that they're deliberately crippling?" Howard would not depart as far as to claim AWS is consciously doing a terrible job of implementing its MariaDB cases. Howard did say, "after which it became clear that, however, you want to articulate this, there's anything no longer kosher happening."
Howard does not acquire lots against AWS advertising its own brands. "it truly is just merchandising. they may be welcome to conclude this. I don't suppose it be the amend factor to do. appropriate. however i am no longer gonna i'm now not going to be really tremendous essential of that. Like, in case you depart right into a pharmacy, they frequently acquire earnings on their personal endemic issues." but, if AWS's going out of its approach to Make a emulate service appear not so righteous as its own, neatly, Howard's not satisfied about that.
Of direction, it's additionally rather viable that unoptimized widely wide-spread MariaDB illustration will with no cataclysm lag at the back of AWS-optimized Aurora. That noted, even during this most blameless grasp on the benchmark outcomes, cloud clients can be sensible to advocate in irony that cloud situations of any selected utility carrier may additionally no longer be created equal.
also: Warren Buffett has offered his Oracle shares
searching forward, Oracle and Amazon regardless, Howard's bound MariaDB is coming out now not simply as a MySQL clone however as an tremendous company DBMS vigour. "We work with the greatest agencies in the world. United airlines uses MariaDB for each ticket. MariaDB is working that airline. Forty p.c of Fortune 2000 companies already depend on MariaDB at a degree that the NoSQL can most efficient dream of. For efficiency, Oracle and DB2 are their only rivals."
Aurora? Howard sneered, "The foremost Aurora can conclude in a failover is 12 seconds. MariaDB can conclude it below a 2nd."
From where Howard stands, if you are no longer using MariaDB yet -- notwithstanding your enterprise is tied to Oracle with licenses of metal -- you quickly might be. "MariaDB is the heir plain to Oracle."connected reviews:
In-DepthOracle gear strategy: 10G alerts grid path
in the days ahead, that evolution will grasp some current steps ahead. Oracle is getting ready to update some gear -- with more than a passing nod to its database methods roots -- to play more suitable in the emerging arena of Grid computing.
whereas Oracle-as-toolmaker is usually overshadowed via Oracle-as-database-maker, the Silicon Valley-primarily based solid is a major coerce in the progress world, and it has increasingly tried to develop its gear beyond database-centric design. Oracle has committed years and demanding components to its utility progress items, and considers its gear company to be nothing lower than a using drive in the back of revenue of its different choices.
“To the extent to which they are able to Get developers working with the Oracle platform, that’s first rate for their company as an entire,” said John Magee (left), vice chairman of software servers and gear in Oracle’s product advertising group.
“We invest a worthy deal in developers and construction tools beyond any revenue they might automatically generate. more peculiarly, they view developer productiveness as strategic to their long-term boom and desires as a company,” he stated. “where developers go, the mindshare of the platform goes, and that drives their revenues.”
Few observers question that Oracle’s existing gear approach is closely linked with its purposes and market-main database groups. because the business has moved to create attainable middleware platforms in fresh years, the hyperlinks acquire not at complete times been as taut as some would suspect, youngsters. in reality, builders complained that early types of Oracle’s Java construction product provided Little befriend for edifice apps that would interact with the Oracle DB. it's a miles bellow from when Oracle gear had been tied at the hip to its flagship database.
today, Oracle works dote others to position its app servers and tools as competencies standalone offerings. dote others, it seeks to ease the burden of Java progress and to enlarge commercial enterprise developer productivity.
The fashioned incarnation of the AppBuilder for Java tool became spawned by supply code from Borland’s JBuilder, which Oracle licensed in 1997. using that source code as a groundwork, the company released version 1.0 of the device in 1998.
That early edition advanced drastically over several generations into an entire IDE, renamed JDeveloper. The three.0 release of the tool brought business components for Java, a J2EE framework designed to deliver design-time facilities and runtime features to simplify the task of constructing, debugging, customizing and reusing company accessories. The concept became to reduce the complexity of constructing business apps by using giving builders constructed-in solutions for typical requirements. That remonstrate of reducing the complexity of the software construction procedure would proceed to handle the evolution of the business’s flagship dev device.
In drop 2001, Oracle added Oracle9i JDeveloper, a very rewritten and 100% sheer Java version of the product. Oracle would soon mingle the IDE and business intelligence (BI) tools into a unique product bundle, dubbed the Oracle9i Developer Suite. The suite became designed to permit users to construct transactional apps that may well be deployed to numerous channels, including portals, internet capabilities and instant structures, and that could be extended with BI capabilities, corresponding to advert hoc query and evaluation, net reporting and superior analysis.
the current gear suite was certainly tailor-made for the three ordinary-primarily based technologies -- Java, XML and SQL -- Oracle considers elementary for supplying functions today. The product also embraced the increasingly regular suggestion that construction products should still supply for the total application edifice lifestyles cycle, combining gear for modeling, deployment, debugging, version control, dependency administration, acquire an upshot on evaluation and efficiency profiling into a unique atmosphere. And it included collaborative edifice capabilities for dispensed undertaking groups.
Magee claims that, according to casual surveys on the Oracle expertise community internet website, greater than half of the app builders presently using JDeveloper are constructing apps for different systems. “That’s a departure from traits of the past couple of years, and they believe it’s the outcome of the emergence of requirements-based technologies,” he stated.
“nowadays, with Java we’ve entered the requisites-primarily based progress market,” Magee referred to.
nonetheless, Oracle admits that its dev tools are most suitable with its own DB and app server. Its web website puts it this way: “while Oracle9iDS is designed to be open with advocate for the latest internet requisites -- including J2EE, XML, WSDL, cleaning soap, UML, WebDAV, XMI and SQL -- the suite works top of the line with the Oracle9i Database and with Oracle9i software Server. Oracle9iDS takes complete competencies of the infrastructure offered by artery of Oracle’s deployment servers to simplify deployment and database interaction.”
“people can -- and conclude -- spend their tools to construct apps for other structures,” Magee stated. “That’s adequate with us,” he quipped, “we’ll simply migrate them later.”
version 9.0.5 of the JDeveloper IDE, which previewed at the JavaOne demonstrate ultimate June, emphasized ease-of-use features, such because the current software construction Framework (ADF) that was designed for programmers lacking the excessive-stage competencies of techniques programmers. The circulation -- dote moves with the aid of BEA, IBM, solar and others -- can also be seen as an try to simplify Java progress so that better ranks of developers can work in the Java house and, now not by the way, to present a competitive option equivalent to Microsoft’s visible basic. along with the more refined points favorite by using advanced coders, the current edition generates low-stage infrastructure code for tying apps to databases and for passing information between consumer interfaces and enterprise objects.“originally, they thought they had really two several types of developers that they desired to serve -- coders with excessive-degree abilities and what they convene ‘company builders,’” mentioned Ted Farrell (left), architect and senior director of method for application progress gear at Oracle. but attaining a consensus on the artery to carry such “dual-functionality” become now not handy.
“JDeveloper has an extensible architecture, so they kicked across the theory of literally constructing and packaging two divide tools,” spoke of Farrell. “essentially immediately, they found ourselves in big arguments over which function should still depart into which version of the device.
“Then they notion about developing a ‘vigor mode’ for the coders and a ‘fluff mode’ for the others,” he endured. “but they ran into the selfsame complications. at last, they concluded that their assessment that there are just two styles of users was off. basically, there are probably lots of forms of users on a sliding scale of competencies and event.”
in line with the mannequin-View-Controller (MVC) architecture, the application construction Framework is designed to allow developers to seat of attention on the enterprise righteous judgment rather than on the underlying applied sciences. It provides users who've a less-than-skilled command of J2EE with visible, declarative and guided coding points. developers exploit the application’s meta statistics the usage of visible equipment, whereas the framework executes the application in the most useful approach the usage of business-commonplace J2EE design patterns.
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The Oracle Certification Program continues to be the most approved certification among complete database vendors. This is no flabbergast considering Oracle has dominated the market for big scale relational databases worldwide. Oracle has completely revamped the DBA Certification track with the release of the Oralce9i database. To best understand the modifications that the DBA track has undergone, it's best to first review the Oracle8i DBA track.
To become an Oracle8i Certified Professional (OCP) DBA, the certification candidate needed to pass five exams:
Passing complete five exams was a very challenging task, to lisp the very least. The first two exams in the track were often considered to be among the toughest...as mastery of their content was essential in passing exams 3 and 4. The Network Administration exam was an entity of its own, containing content much different than the others...although extremely notable for the DBA to achieve his or her duties.
With Oracle9i, the DBA Certification track is now divided into 2 primary tiers, as well as a third Master-level tier:
The core Oracle9i DBA track consists of 4 exams: 2 for OCA, and an additional 2 for OCP.
Oracle9i Certified Associate (OCA)
The OCA tier was designed to provide for an entry-level DBA certification designation for the Oracle9i platform. Information Technology professionals with Little or no Oracle undergo can obtain the information and skills necessary to fracture into the highly lucrative and challenging Oracle profession. The skills obtained from completing this certification track will allow the candidate to participate on Oracle-related projects acting as junior-level DBAs. Typically, a senior-level DBA will work closely to allocate usurp DBA tasks to strengthen existing skills, and challenge them to learn slightly more advanced procedures.
The Oracle9i Certified Associate (OCA) requires passing two exams:
Oracle9i Certified Professional (OCP)
The OCP tier was designed for mid to senior-level DBAs with one or more years of focused Oracle DBA experience. The information and skills obtained from completing this tier of the certification program prepare the DBA to provide the complete assortment of DBA-related tasks...from Database Design and progress to production tasks such as Performance Tuning and Backup & Recovery.
The Oracle9i Certified Professional (OCP) requires passing the two exams in the OCA Tier, plus two additional exams:
Note: It is also viable to become an Oracle9i Certified Professional (OCP) by taking one exam: Oracle9i: current Features for Administrators. To qualify to become an OCP by taking this one "Upgrade" exam, you must first be an Oracle8i Certified Professional (OCP).
Oracle9i Certified Master (OCM)
There is a third tier to the Oracle9i DBA Certification Track, the OCM. This track is targeted at very senior plane DBAs and Oracle consultants. If you acquire less than 5 years of grave Oracle work experience...and acquire not spent many hours working with and testing advanced Oracle9i features...don't even respect this Tier as an option. I don't handle to sound negative about this, but let me continue with more on the requirements...and hopefully you'll espy what I mean.
The OCM designation first requires that you obtain your Oracle9i OCP credential. Once this is secured, Oracle requires that you grasp two advanced Oracle courses from Oracle University. These are Instructor-led courses that will cost on medium $2,000 each. There are about a dozen different courses to pick from:
Once you've completed the course requirements, you can then register for and grasp the "practicum" exam. The practicum is a two-day, hands-on performance exam that requires the candidate to achieve a number of tasks using Oracle9i on the Linux platform. Some of the skills that requisite to be proven include: database configuration, replication, partitioning, parallel operations, diagnostics, troubleshooting, performance tuning, and backup and recovery...all with "real-world" scenarios.
So, what's the problem with that you may ask? First, the skills you'll requisite to know and be able to achieve are covered in many more than just two of the advanced courses you'll be required to grasp from Oracle University. So even if you conclude grasp the two required courses, you'll requisite to learn and be prepared for much more. This could require many months of additional self-study or many thousands of dollars in additional Oracle University courses. Second, the cost of the practicum exam is an outrageous $2,000. You won't want to fail and re-take (re-pay) for this exam!!
Don't Get me wrong, I esteem the notion of a Master-level Oracle certification, but the course requirements and exam cost Make this Tier cost-prohibitive for most.
Continued in Part II.For More Information
Get the basics of remote server access as well as how you can profit from this access today. You will undergo workable examples that will bring you to an immediate and practical understanding of remote server access.This chapter is from the book
After reading this chapter, you will be able to understand:
For this book's purpose, there are two viable installation configurations: remote and local. A remote configuration uses your computer to access a remote server machine. A local configuration first determines whether you requisite to access a remote server machine.
You could be working locally, on a computer that has the Oracle database, application server, and client software complete installed on the selfsame machine, or you could be working remotely, using your computer to access a remote server machine. If you acquire installed Oracle9i Personal Edition on your computer, then you acquire a local installation.
Understand that most real-world databases are housed on a server machine, which is accessed remotely by client machines. If you acquire a remote configuration, dote that often found in a corporate training environment or an educational setting, then you should find the information in this chapter immediately applicable to your work. You may acquire been granted access to a remote server machine on which you can complete the exercises in this book. In this case, check with the system administrator to espy if you acquire access privileges needed to complete the exercises in this chapter. It is also viable that your company may acquire a progress configuration where the client, Web server, and database server are on one machine, isolated from the leisure of the network. This sort of configuration is illustrated as you work through the exercises in this book.
The selfsame holds genuine for Web sites; the majority of Web sites are also housed on server machines (commonly referred to as simply servers), with a connection to the Internet. Web applications, such as the one you build in this book, acquire many Web pages that are dynamically generated from database procedures, so there is not a worthy requisite to store static HTML files on a server. Yet image files can be stored inside the database or they can be stored on a Web server, as can any static HTML pages you wish to spend in your application. It depends on how your database is configured. Documents that require a plug-in to view, and any files of other types other than HTML or image that are used in the application, such as Adobe Acrobat files or Word documents that are intended to be downloaded, can be stored on the Web server or in the database. Chapter 13, "Images," illustrates the method for storing and retrieving documents from an Oracle 9i database.
If you conclude not acquire access to a remote server machine, then advert to Chapter 2, "Oracle 9iAS," in which you learn that your local machine can be used as the server, the client, and the middleware necessary to complete the exercises in this book. remember that if you install an Oracle9i database on your own machine, the installation includes a basic Oracle 9iAS. You can store static HTML pages or images in your own computer's file directory, and configure the Oracle HTTP Server component of the Oracle 9iAS to find the files you want. This is done by identifying the directory where your images and HTML files are stored in the Oracle 9iAS, and giving that directory a virtual name, as explained in Chapter 2, "Oracle 9iAS."The Server
The server is a big file directory that you requisite to access in order to complete the exercises in this book. You store files there, such as HTML files or image files, that you wish to Make accessible to users on the Internet. You must map specific directories on the server machine to virtual directories in the 9iAS so that the amend directories can be accessed, depending on the URL (Uniform Resource Locator) the user supplies.
About 80% of databases are stored on machines that rush the UNIX operating system, and are familiarly known as "UNIX boxes." Since databases are also stored on machines running NT, many NT commands, where they differ from UNIX commands, are noted throughout this chapter.Telnet
Telnet is software that provides a user or developer a artery to connect to a server machine. It is a terminal emulator, which means it gives users the capacity to log in to a server machine and work on it remotely. When a developer connects to a server via Telnet, the developer begins a Telnet "session" on the server. Telnet allows you to cross platforms, acceptation that if you are on a Windows PC, you can Telnet to a UNIX server and vice versa.
Most computers running Windows compass with a basic version of Telnet software installed. The quickest artery to originate a Telnet session is to depart to the Start menu and pick "Run…." You are asked to "Type the designation of a program, folder, or document, and Windows opens it for you." sort the word "telnet" and click OK. A window should pop up that has the word "Telnet" in the title bar.
Once you acquire successfully invoked a Telnet session, the next step is to connect to a server. No matter what version of Telnet software you use, you must know three things ahead of time in order to be able to successfully connect to a remote server—the designation of the server, a login ID, and a password. If you are going to be connecting to a server and working there, chances are the system administrator knows that you are going to be doing this, and has provided you with the designation of the machine and a login ID and password. A sample server designation might be server4.virgil.com, where server4 is the designation of the machine on the virgil network. Some people prefer to convene a machine by its numeric IP address, such as 220.127.116.11.
The method you spend to connect to the server depends on the benign of Telnet software installed on your machine. If your Telnet window has a prompt, you can enter the words "open server4.virgil.com" to open a connection. If your version of Telnet does not acquire a prompt, then recognize on the menu bar for an item called "Connect." This is probably the first item on the menu bar. Click on Connect and you are provided with a location to enter the server name. The host designation is another term for server name—the server you are connecting to hosts your guest connection.
You are then prompted for a login designation (ID) and password. Enter the login designation and password provided by your system administrator. Once you are connected, you should espy a $ prompt, or possibly a % or # prompt. This is sort of anticlimactic. However, be assured that you are connected. You may also espy a list of environment or user settings, or a short message of greeting that was configured by the system administrator.Basic UNIX Commands
Once you acquire connected to the server, you requisite to know how to navigate around the directory structure of the server and wield your files. You accomplish this using basic UNIX commands.
The first step in navigation is to know where you are. When a user logs in, the user will always originate from the selfsame initial directory, called the home directory. This home directory is determined when a user account is created by the system administrator, and is included in the configuration for each user who will be accessing the server. Different users are usually assigned different home directories. In order to find out which directory you are presently in, sort the UNIX command pwd. This will print your present working directory. You espy different values for pwd as you travel through the file system. In NT, your prompt is always inclusive of the present working directory.
To espy a list of complete of the contents of the present directory, sort ls and enter. The names of complete of the files and subdirectories in the current directory will be listed. To obtain a list with more details, sort ls -l and press the Enter key. The -l after the ls is called an argument. Supplying arguments after UNIX commands is a artery to supply more specifics about what you want the UNIX command to accomplish. Arguments are listed after the command, and the syntax is a minus note followed by one or more letters that indicate what options you'd like. The -l is a convincing argument for the ls command, which tells the server to array a longer description of each file and subdirectory.
As you navigate through directories, pwd and ls -l (or simply reading the prompt itself and typing dir in NT) will probably be the commands you spend most often, to find out where you are and what is in the directory where you are.
If the ls -l command returns more file and directory names than lucky on the screen, enter ls -l | more instead. The screen fills one page, so to speak, with data, and then UNIX waits for you to press a key before displaying another screen page of data. The selfsame is accomplished in NT by including /p after the command, to indicate that the computer should pause and wait for a key to be pressed before displaying more information.
Take a recognize at the results from ls -l in more detail. Here is some sample output from running the ls -l command in UNIX:-rw-r--r-- 1 bobo devel 118253 Jul 17 12:05 1stlog1.wav drwxr-xr-x 2 bobo devel 4096 Nov 14 18:30 gfx -rw-r--r-- 1 bobo devel 1036 Nov 14 19:04 index.html -rw-r--r-- 1 bobo devel 973 Nov 14 18:32 index_old.html -rw-r--r-- 1 bobo devel 17451 Sep 5 00:35 syllabus.html -rw-r----- 1 bobo devel 0 May 24 2001 test.htm
The first column shows the file permissions, which are discussed in more detail later. Note that the first character is either a "d" or a dash. You could also espy an "l" here (indicating a symbolic link). A "d" in the first spot indicates a directory. The second column (denoted here by a list of numbers) shows the number of links to a file. The third column shows the owner of this file or directory; in this case, the owner is bobo. The owner is the user who has control over the file. The fourth column shows the group that the user bobo belongs to; in this case, devel. The fifth column shows the size of the file in bytes. The sixth column shows the date and time the file was created or terminal changed. Finally, the designation of the file is displayed in the seventh column.
One of the most notable columns to pay attention to when developing Web applications or documents is the first column. It indicates what permissions its owner has granted on the file. These permissions are powerful; they determine how much access users can acquire to each file, and what users can conclude with each file. Through permissions, files are made accessible on the Internet, or blocked from being accessible on the Internet, so it is notable to understand and check file permissions, and to apply them carefully.Table 3.1. File Permissions Permission Character Number Equivalent read r 4 write w 2 execute x 1 none - 0 (Note that a hyphen symbol, "-", is the character displayed when zero of the other three permissions is granted for a file.)
There are three types of file permissions that can be granted on a file or directory. Table 3.1 outlines these three types. Though "none" is listed in Table 3.1 in the "Permission" column, it is not a permission type, per se. Rather, it is the option available to you if you conclude not pick to enter one of the other three.
There are four levels of users when granting permissions, however. These four levels are outlined in Table 3.2.
Listed in Table 3.3 are some examples of different types of granted permissions. grasp a recognize at the permissions listings in the left column. After the first character, which indicates whether the current file is actually a directory or just a file, the other nine characters indicate the permissions for each sort of user. The second, third, and fourth characters demonstrate permissions at the user level. The next three characters demonstrate permissions at the group level, and the terminal three characters denote permissions for everyone else, the other level. These terminal three characters govern whether the public can read, write, or execute a file. These permissions examples provide a description of what each set of permissions permits, and to whom.Table 3.2. Levels of Users Level Letter Who is This user u The owner of the file, not just any user group g A group of users—users can be associated with groups by the system administrator other o Anyone who is not already included in either of the first two levels all a All users Table 3.3. Examples of File Permissions Sample Permissions Access -rwxrwxrwx The user, group, and everyone else can read, write, and execute -rwxr-xr-x Only the owner can read, write, and execute. Everyone else can only read and execute. -rwxrwx-- Only the owner and group can read and execute.
Remember that file permissions determine whether a file is accessible to the public on the Web. In the examples above, the public would be able to access files with the first two permission sets, but not the third set of permissions. The first file would also be writeable, that is, updateable, by the public.
Always check file permissions to Make positive that they are amend for each file. Files that are not intended for public access on the Web should not be made accessible to the public. When it is time to "publish" a file, the permissions for complete users must be changed to allow others to view the file.
Each set of permissions has a three-digit numeric equivalent. For example, the permissions -rwxr-xr-x are also known as 755. How is this determined? Each digit corresponds to one of the three levels of permissions; the three digits indicate the permissions for the user, group, and other levels, respectively. The number for each plane is arrived at by adding the numeric equivalents for each level. As listed above, each permission—read, write, and execute—has a numeric equivalent. These numbers are added to arrive at each digit. In 755, the 7 in the user slot means the user can read (4), write (2), and execute (1) the file; 4 + 2 + 1 = 7 and 7 is used. The second slot has the value 5, acceptation that at the group level, only read (4) and execute (1) permissions acquire been granted; 4 + 1 = 5, so 5 is used. The third digit is also 5, acceptation that the permissions at the "other" plane are the selfsame as they are at the group level; everyone else has the capacity to read (4) and execute (1), and 4 + 1 = 5, so 5 is used again.
The UNIX command to change a file's permissions, or "change mode," is chmod.
The 755 indicates what the file permissions should be for the file "myfile". A 755 is a approved election for a file that is intended to be accessed by the public, since it prevents anyone but the owner from updating the file, while allowing everyone else to access it.
Be extremely mindful not to Make files accessible that should not be. To remove access from a level, spend a zero (0) for the corresponding digit. This sample gives complete rights on the file to the owner, but revokes access from everyone else:chmod 700 myfile
NT users, note that you may change permissions on your files using basic Windows Explorer functionality.Basic Navigation
Now that you know how to determine which directory you are in and what its contents are, how can you navigate? The cd command lets you change directories in both UNIX and NT. Table 3.4 lists some basic navigation commands you can spend for affecting up and down in a directory tree.
Table 3.5 lists some additional commands you can spend in a Telnet session on the server to manage your files.
The cp, or copy, command is particularly useful for making backup copies of documents before changing them or creating current versions of them. The convention is to advocate the selfsame designation for the file, but append to the designation the date that you are changing the file. If you are creating a backup file for myfile on March 1, 2002, you might create a copy called myfile20020301.Table 3.4. Basic Navigation Commands Command Description cd directoryname Navigates downward in the directory tree to the subdirectory "directoryname." If you are unable to poke to that directory, spend ls -l to espy if you are using a convincing subdirectory name. cd .. Navigates upward one plane in the directory tree. cd cd without anything after it takes you to your own home directory (NOTE: In NT, entering this command by itself will simply print your current working directory onto the screen.) cd /mydirectory The forward slash means you want to skip to the highest plane in the directory tree, start from there, and depart to the subdirectory "mydirectory." This is the equivalent of typing cd .. repeatedly until you are at the topmost directory, and then typing cd mydirectory. Table 3.5. Additional Commands for File Management and Manipulation Command Example Description rm myfile Deletes or removes the file called "myfile." rm –i Prompts the user before the system deletes the file (as a safety measure). mkdir mydirectory Creates a directory called "mydirectory." rmdir mydirectory Deletes or removes the directory called "mydirectory." cp myfile mynewfile Copies the file "myfile"; the copy is called "mynewfile" and is located in the selfsame directory as the original "myfile" file. cp myfile /home/app/mynewfile Copies the file "myfile"; the copy is called "mynewfile" and is located in the /home/app/ directory. The cp command can copy files to another directory. mv myfile mynewfile Moves the file, or renames it. In this example, the file will be moved from its present location under the designation "myfile" to the selfsame directory under the designation "mynewfile." This effectively renames the file. This is the artery to rename a file in UNIX. mv myfile /home/app/ Moves the file "myfile" to the directory /home/app/. In affecting the file, it is not also renamed, because no current designation was specified. Absolute vs. Relative Path and Filenames
A complete pathname, a pathname starting at the root or topmost directory, is also known as the absolute pathname. The pathname starting from where you are currently, wherever that may be, is known as the relative pathname. respect the following directory structure as an example. classnotes is the topmost directory. homework is a subdirectory of classnotes, and homework_one is a subdirectory of homework.Docroot> classnotes homework homework_one Absolute Paths
An absolute path contains the complete URL (Uniform Resource Locator) for a file. A URL typically consists of four parts: the protocol, the server/domain, the path directory, any subdirectories, and finally, the actual file designation itself. An sample of an absolute path listing is http://www.server4.virgil.edu/classnotes/homework/homework_one/hw1Answers.htm.
An absolute path is the selfsame as the path in the address window of a browser (this address window is also referred to as a location). Absolute paths are fine for linking to files outside of your Web site. However, using the absolute path to link to other files within your Web site has disadvantages.
Say that a Web site uses absolute paths for complete of its links and images. This prevents the Web site from being portable. The result is the site's files cannot be moved to another server without having to change each and every file path to reflect the current address. This really becomes an issue if there are different environments. A typical network infrastructure has multiple environments, each on its own server machine. These include:
Using absolute paths requires that the links be changed each time the site is moved to the next environment on the next machine. How can you avoid this and at the selfsame time Make a Web site portable? The retort is to spend relative paths.Relative Paths
It's preferable to spend relative pathnames when linking to documents within your own Web site. There are two types of relative paths: root-relative paths and document-relative paths.
A relative path uses as its starting point either (1) the Web site's docroot, or (2) the location of the page that holds the relative path. Using this starting point, the browser is able to find a file.Root-Relative Paths
A root-relative path always starts with '/' (a forward slash) and does not comprise the protocol and domain names. The starting point is the Web server's docroot based on the current document.
In this sample the search begins in the docroot of the Web server on which the current page resides, or www.server4.virgil.edu. To reference the file, hw1Answers.htm, simply start at the topmost directory and drill down to the directory where the file resides.Document-Relative Paths
A document-relative path does not originate with '/' (a forward slash) and, dote a root-relative path, does not comprise the protocol and domain. The starting point is the current document displayed in the browser. Thus, these paths are relative to the document.
To reference a file in the selfsame directory as the current browser document, just reference the designation of the file:
To reference a file located in a directory below the current page, reference the subdirectory and file:
To reference a file located in a directory above the current page, sort in two sequential periods, "..". If the current document is located in the directory "homework_one" and you want to reference a document in "homework", then the path would be written dote this:
Add an extra set of ".." for each directory that you requisite to depart up. For example, to reference a file located two directories up from the current document, you could write the following:
In this case, navigating two directories up from the "homework_one" directory puts you in the "classnotes" directory.Root-Relative versus Document-Relative Paths
Now that you understand that a relative path is preferable to an absolute path for linking to files within your Web site, which sort of relative path should you use: root-relative or document-relative paths?
It depends. Both give you the desired portability. If a site has an images directory that will not be moved, then a root-relative path is preferable for such a directory since the path to the images contained in it will always be convincing regardless if the Web document (that references this directory) itself is moved to another directory. Document-relative paths, however, watch to be shorter, and may be preferable for that intuition alone. Both types of relative paths can become invalid if a file is moved. So, the election of whether to spend root-relative or document-relative paths depends on the particular Web site and Web developer.Transferring Files via FTP
There are two options for delivering static files with Oracle 9iAS. You can store the files in the database or you can deliver them using the Apache Web server component. In the latter case, you are delivering, or serving, files from the file system of the server. When you acquire files that you want to Make accessible on the Web, you must location them on the server. Files can be transferred to a remote server using FTP. FTP stands for File Transfer Protocol, which is an apt description of what it does.
You also spend FTP to retrieve files for editing. This book does not argue how to edit files directly on the server, since the editing tools available within the UNIX and NT environments (save for the book's discussion concerning Notepad) are outside the scope of this book. However, it is just as efficient to transfer files from a server to a local machine, edit the files locally using Notepad or another plain text editor, and then transfer the edited file back to the server; in fact, there are developers who prefer to work this way.
To spend FTP, you requisite the selfsame three pieces of information you requisite when connecting to the server: the server name, a login ID, and a password for that machine.
You also requisite to know what sort of transfer you want to accomplish. There are two modes for transferring files: binary and ASCII. The sort of the file being transferred determines which mode should be used. ASCII is used strictly for plain text files only, such as files you open and read in Notepad without affecting the content. complete other files, including word processing documents, images, and .pdf files, must be transferred in binary mode. If you are not inevitable what sort of file you have, try opening it in Notepad and espy if the content is displayed correctly. If not, spend binary mode.
You spend text commands to transfer files via FTP. be awake that products exist that present a graphical interface for using FTP, such as WS_FTP and Hummingbird. These can be easier to spend if you find yourself transferring big numbers of files often.
To transfer files, you must first access a "command-line prompt" in MS-DOS. depart to the Start menu and pick "Run…" off the menu popup. sort cmd or command in the space provided and click OK. A window should pop up with a prompt such as C:\WINDOWS>.
The FTP utility can connect a Windows PC to a UNIX server, or a Windows PC to a Windows server. The sample used here illustrates a Windows PC connection to a UNIX server. At the prompt, sort ftp followed by the designation of the server you wish to access.
FOR EXAMPLEC:\WINDOWS> ftp server4.virgil.edu
You will be prompted to supply your user designation and password. If successful, you espy an ftp> prompt. To view a list of ftp commands available at this prompt, sort befriend followed by the Enter key. To view befriend for a specific command, such as put, sort befriend followed by the command, such as befriend put.
The pwd, ls, and cd commands introduced earlier in this chapter are also available at the ftp> prompt, so spend them to navigate to the directory where the file should be placed. be positive you are in the directory where you want to location the document before you proceed.
Set the transfer mode that you want, using either of the two commands, binary or ascii. Below is an sample of switching to binary, and then to ASCII mode.
To transfer the file, spend the build command and the path and filename for the file you are transferring. If you stored a file in C:\TEMP\DOCUMENTS called NEWPAGE.HTM, and you want to transfer it, you enter the following:ftp> build c:\temp\documents\newpage.htm
Following are sample messages received after issuing the build command:200 PORT command successful. 150 Opening ASCII mode data connection for NEWPAGE.HTM. 226 Transfer complete. ftp: 83 bytes sent in 0.6Seconds 1.38Kbytes/sec. ftp>
You can also retrieve a file from the server to work with locally. To accomplish this you spend the Get command:ftp> Get myserverfile.htm
The myserverfile.htm file is retrieved, and placed in the directory on your file system that you started from when you issued the ftp command.
If you wish to transfer many files at once, you can spend different versions of the Get and build commands: mget and mput. Since these are commands for many files, instead of specifying one file, spend the asterisk (*) as a "wildcard" character. Using *.* indicates that complete files should be transferred. Here is an sample of mput that will build complete files with the extension .htm on the server:ftp>mput c:\temp\documents\*.htm
Here is the command with sample output. Note that there are two files, apple.htm and orange.htm, and that the ftp program prompts the user to supply a "y" or an "n" for each file before transferring it. The first file is confirmed for transfer while the second is not:ftp>mput c:\temp\documents\*.htm mput c:\temp\documents\apple.htm? y 200 PORT command successful. 150 Opening ASCII mode data connection for orange.htm 226 Transfer complete. ftp: 7330 bytes sent in 0.6Seconds 1.38Kbytes/sec. mput c:\temp\documents\orange.htm? n ftp>
The mget command makes similar spend of the asterisk as a wildcard character. Here is a sample of the mget command that retrieves complete types of files from the server that originate with an "a":ftp>mget a*.* 200 sort set to A. mget apple.htm? y 200 PORT command successful. 150 Opening ASCII mode data connection for apple.htm(11 bytes). 226 Transfer complete. ftp: 7330 bytes sent in 0.6Seconds 1.38Kbytes/sec. mget artichoke.pdf? n ftp>
Keep in irony whether the current transfer sort is binary or ASCII. In the mget example, the transfer sort was set to A or ASCII. The second file to be transferred was artichoke.pdf, which is not a plain text file. If the file had been retrieved from the server in ASCII mode, the resulting local file would acquire been unreadable. It would acquire to be transferred a second time, with the transfer mode set to binary. be mindful of the transfer mode whenever you are transferring files. It is particularly light to overlook the transfer sort when working with multiple files, so the artery the ftp program prompts the user to corroborate transfer of each individual file is extremely helpful here.
Finally, to terminate the FTP session, sort quit or bye and press the Enter key.
Once your files are transferred to the server, remember to connect to the server using Telnet, and check the permissions on the files, changing the permissions as necessary.
In-DepthOracle tools strategy: 10G signals grid direction
In the days ahead, that evolution will grasp some current steps forward. Oracle is preparing to update some tools -- with more than a passing nod to its database systems roots -- to play better in the emerging arena of Grid computing.
While Oracle-as-toolmaker is usually overshadowed by Oracle-as-database-maker, the Silicon Valley-based solid is a major coerce in the progress world, and it has increasingly tried to broaden its tools beyond database-centric design. Oracle has committed years and significant resources to its software progress products, and considers its tools business to be nothing less than a driving coerce behind sales of its other offerings.
“To the extent to which they can Get developers working with the Oracle platform, that’s righteous for their business as a whole,” said John Magee (left), vice president of application servers and tools in Oracle’s product marketing group.
“We invest a lot in developers and progress tools beyond any revenue they might immediately generate. More specifically, they view developer productivity as strategic to their long-term growth and goals as a company,” he said. “Where developers go, the mindshare of the platform goes, and that drives their revenues.”
Few observers question that Oracle’s current tools strategy is closely linked with its applications and market-leading database businesses. As the company has moved to create viable middleware platforms in recent years, the links acquire not always been as taut as some would suspect, however. In fact, developers complained that early versions of Oracle’s Java progress product provided Little advocate for edifice apps that would interact with the Oracle DB. That is a far bellow from when Oracle tools were tied at the hip to its flagship database.
Today, Oracle works dote others to position its app servers and tools as potential standalone offerings. dote others, it seeks to ease the burden of Java progress and to enlarge enterprise developer productivity.
The original incarnation of the AppBuilder for Java tool was spawned by source code from Borland’s JBuilder, which Oracle licensed in 1997. Using that source code as a foundation, the solid released Version 1.0 of the tool in 1998.
That early version evolved significantly over several generations into a complete IDE, renamed JDeveloper. The 3.0 release of the tool introduced business Components for Java, a J2EE framework designed to provide design-time facilities and runtime services to simplify the task of building, debugging, customizing and reusing business components. The notion was to reduce the complexity of edifice enterprise apps by giving developers built-in solutions for common requirements. That goal of reducing the complexity of the software progress process would continue to influence the evolution of the company’s flagship dev tool.
In drop 2001, Oracle introduced Oracle9i JDeveloper, a completely rewritten and 100% sheer Java version of the product. Oracle would soon combine the IDE and business intelligence (BI) tools into a unique product bundle, dubbed the Oracle9i Developer Suite. The suite was designed to allow users to build transactional apps that could be deployed to multiple channels, including portals, Web services and wireless platforms, and that could be extended with BI capabilities, such as ad hoc query and analysis, Web reporting and advanced analysis.
The current tools suite was specially tailored for the three standard-based technologies -- Java, XML and SQL -- Oracle considers essential for delivering applications today. The product also embraced the increasingly approved notion that progress products should provide for the entire software progress life cycle, combining tools for modeling, deployment, debugging, version control, dependency management, impact analysis and performance profiling into a unique environment. And it included collaborative progress capabilities for distributed project teams.
Magee claims that, based on informal surveys on the Oracle Technology Network Web site, more than half of the app developers currently using JDeveloper are edifice apps for other platforms. “That’s a departure from trends of the past couple of years, and they believe it’s the result of the emergence of standards-based technologies,” he said.
“Today, with Java we’ve entered the standards-based progress market,” Magee noted.
Still, Oracle admits that its dev tools are most compatible with its own DB and app server. Its Web site puts it this way: “While Oracle9iDS is designed to be open with advocate for the latest Internet standards -- including J2EE, XML, WSDL, SOAP, UML, WebDAV, XMI and SQL -- the suite works best with the Oracle9i Database and with Oracle9i Application Server. Oracle9iDS takes complete edge of the infrastructure offered by Oracle’s deployment servers to simplify deployment and database interaction.”
“People can -- and conclude -- spend their tools to build apps for other platforms,” Magee said. “That’s OK with us,” he quipped, “we’ll just migrate them later.”
Version 9.0.5 of the JDeveloper IDE, which previewed at the JavaOne demonstrate terminal June, emphasized ease-of-use features, such as the current Application progress Framework (ADF) that was designed for programmers lacking the high-level skills of systems programmers. The poke -- dote moves by BEA, IBM, Sun and others -- can be viewed as an attempt to simplify Java progress so that larger ranks of developers can work in the Java space and, not incidentally, to present a competitive alternative akin to Microsoft’s Visual Basic. Along with the more sophisticated features preferred by advanced coders, the current version generates low-level infrastructure code for tying apps to databases and for passing data between user interfaces and business objects.“At first, they thought they had basically two different types of developers that they wanted to serve -- coders with high-level skills and what they convene ‘business developers,’” said Ted Farrell (left), architect and senior director of strategy for application progress tools at Oracle. But reaching a consensus on how to deliver such “dual-functionality” was not easy.
“JDeveloper has an extensible architecture, so they kicked around the notion of literally edifice and packaging two divide tools,” said Farrell. “Almost instantly, they found ourselves in huge arguments over which feature should depart into which version of the tool.
“Then they thought about developing a ‘power mode’ for the coders and a ‘fluff mode’ for the others,” he continued. “But they ran into the selfsame problems. Finally, they concluded that their assessment that there are just two types of users was off. In fact, there are probably thousands of types of users on a sliding scale of skills and experience.”
Based on the Model-View-Controller (MVC) architecture, the Application progress Framework is designed to allow developers to focus on the business logic rather than on the underlying technologies. It provides users who acquire a less-than-expert command of J2EE with visual, declarative and guided coding features. Developers exploit the application’s meta data using visual tools, while the framework executes the application in the most efficient artery using industry-standard J2EE design patterns.
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