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Test Code : 000-205
Test denomination : High-End Disk Solutions for Mainframe Version 6
Vendor denomination : IBM
: 121 true Questions

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High-End Disk Solutions for Mainframe Version 6 book

Database Administration: creating the Database environment | 000-205 true Questions and VCE rehearse Test

setting up a usable database ambiance requires a very marvelous deal of skill, skills, and consideration. This chapter will outline the principles worried in organising a usable database atmosphere.

This chapter is from the booklet 

one of the simple initiatives associated with the job of DBA is the manner of determining and setting up a DBMS. unluckily, many company executives and IT professionals devoid of database management history matter on that as soon as the DBMS is set in, the majority of the travail is accomplished. The reality is, deciding upon and installing the DBMS is rarely the most tricky a fraction of a DBA’s job. organising a usable database environment requires a fine deal of skill, talents, and consideration. This chapter will define the concepts worried in organising a usable database ambiance.

The procedure of deciding upon a suitable DBMS for commercial enterprise database administration is not as intricate because it used to be. The variety of main DBMS carriers has dwindled because of industry consolidation and domination of the sphere with the aid of just a few very huge players.

Yet, gigantic and medium-size corporations typically race dissimilar DBMS items, from as few as two to as many as ten. as an example, it isn't distinguished for a huge enterprise to employ IMS or IDMS and DB2 on the mainframe, Oracle and MySQL on several diverse UNIX servers, Microsoft SQL Server on home windows servers, as well as pockets of different DBMS products comparable to Sybase, Ingres, Adabas, and PostgreSQL on a lot of platforms, now not to point out single-consumer computer DBMS items such as Microsoft access, Paradox, and FileMaker. Who chose to install full these DBMSs and why?

lamentably, often the reply is that now not a lot thought and planning went into the determination-making procedure. every so often the resolution to buy and deploy a new DBMS is pushed by way of a traffic requisite or a brand new utility. here's low-cost in case your corporation has no DBMS and must purchase one for the primary time. here's hardly the case, though. inspite of no matter if a DBMS exists on-website, a new DBMS is often viewed as a requirement for a brand new software. every now and then a brand new DBMS product is bought and set in with out first inspecting if the software may well subsist efficaciously applied the employ of an existing DBMS. Or, extra seemingly, the DBAs know the software can subsist applied using an present DBMS but lack the organizational energy or assist to reject a new DBMS suggestion.

There are different causes for the being of diverse DBMS platforms in a single organization. possibly the company bought a traffic off-the-shelf utility package that doesn't race on any of the latest DBMS systems. from time to time the determination to purchase a new DBMS is driven via the requisite to aid the latest and most efficient know-how. as an instance, many mainframe stores relocating from a hierarchic (IMS) or CODASYL (IDMS) database model to the relational mannequin deployed DB2, leading to an extra DBMS to subsist trained and aid. Then, when client/server computing grew to subsist frequent, additional DBMSs had been applied on UNIX, Linux, and windows servers.

once a DBMS is installed, removal may too subsist difficult on account of incompatibilities among the different DBMSs and the necessity of changing software code. additionally, when a brand new DBMS is installed, antediluvian functions and databases are constantly now not migrated to it. The antediluvian DBMS remains and believe to continue to subsist supported. This complicates the DBA’s job.

So what should subsist completed? well, the DBA neighborhood should noiseless subsist empowered to do the DBMS decisions for the organization. No enterprise unit should subsist allowed to buy a DBMS devoid of the leave of the DBA neighborhood. this is a difficult provision to set in obligate and much more intricate to enforce. traffic politics commonly travail in opposition t the DBA neighborhood because it frequently possesses much less organizational vigour than different company executives.

settling on a DBMS

The DBA neighborhood may noiseless set a policy related to the DBMS products to subsist supported inside the organization. every time viable, the coverage should reduce the variety of different DBMS products. For a store with assorted operating programs and numerous forms of hardware, elect a default DBMS for the platform. dishearten aberration from the default until a compelling traffic case exists—a enterprise case that passes the technical inspection of the DBA group.

lots of the foremost DBMS items believe identical features, and if the duty or performance does not exist today, it probably will within 18 to 24 months. So, exercise warning earlier than determining to select a DBMS primarily based completely on its potential to aid a specific feature.

When opting for a DBMS, it is smart to select a product from a tier-1 supplier as listed in desk 2.1. Tier 1 represents the largest providers having essentially the most closely carried out and supported products on the market. You can't fade wrong with DB2 or Oracle. each are universal and support well-nigh any class of database. an additional major player is Microsoft SQL Server, however most efficient for home windows systems. DB2 and Oracle race on several systems starting from mainframe to UNIX, in addition to windows and even handheld instruments. deciding on a DBMS apart from these three should subsist accomplished most efficient under selected circumstances.

desk 2.1. Tier-1 DBMS carriers

DBMS supplier

DBMS Product

IBM traffic enterprise

DB2

New Orchard highway

Armonk, the mammoth apple 10504

mobilephone: (914) 499-1900

Oracle company

Oracle

500 Oracle Parkway

Redwood Shores, CA 94065

telephone: (650) 506-7000

Microsoft traffic enterprise

SQL Server

One Microsoft means

Redmond, WA 98052

cellphone: (425) 882-8080

After the big three arrive MySQL, Sybase, Teradata, and Informix. table 2.2 lists these tier-2 DBMS vendors. full of those offerings are distinguished DBMS products, however their installed ground is smaller, their items are engineered and marketed for district of interest applications, or the agencies are smaller with fewer materials than the big Three (IBM, Oracle, and Microsoft), so there is some risk in deciding upon a DBMS from tier 2 as an alternative of tier 1. youngsters, there may well subsist solid explanations for deploying a tier-2 solution, such as the tall efficiency offered by Informix or the data warehousing and analytics capabilities of Teradata.

table 2.2. Tier-2 DBMS companies

DBMS dealer

DBMS Product

IBM employer

Informix Dynamic Server

New Orchard street

Armonk, the mammoth apple 10504

telephone: (914) 499-1900

Sybase Inc. (an SAP company)

Adaptive Server enterprise

6475 Christie Avenue

Emeryville, CA 94608

mobilephone: (510) 922-3500

Teradata employer

Teradata

ten thousand Innovation force

Dayton, OH 45342

cellphone: (937) 242-4030

MySQL (a subsidiary of Oracle service provider)

MySQL

mobile: (208) 338-8100

Of direction, there are other DBMS products on the market, a lot of which are high-quality products and well-known of consideration for sturdy point processing, positive predefined needs, and district of interest roles. if your traffic is closely into the open-supply utility circulation, PostgreSQL, EnterpriseDB, or MySQL might possibly subsist doable alternatives. If an kick DBMS is vital for a selected undertaking, you may reckon ObjectDesign or Versant. And there are lots of NoSQL DBMS choices purchasable, too, akin to Hadoop, Cassandra, and MongoDB.1

youngsters, for the bulk of your information management needs, a DBMS from a tier-1, or most likely tier-2, DBMS seller will deliver ample functionality with minimal chance. A myriad of DBMS products can subsist found, every with certain aspects that do them useful of consideration on a case-by using-case basis. determining any of the decrease-tier candidates—even such fundamental names as software AG’s Adabas and Actian’s Ingres—involves incurring extra chance. mention to Appendix B for a listing of DBMS companies.

I effect not want it to sound as if the alternative of a DBMS is a no-brainer. you are going to want a technique and a map for choosing the usurp DBMS on your selected condition. When picking a DBMS, subsist sure to accept as accurate with each of these factors:

  • working system help. Does the DBMS support the operating programs in employ at your corporation, together with the types that you're presently the employ of and map on using?
  • category of company. pick into account the company philosophy should you opt for a DBMS. Some organizations are very conservative and want to retain a decent rein on their environments; these agencies are likely to gravitate toward natural mainframe environments. government operations, fiscal institutions, and insurance and fitness corporations constantly minister to subsist conservative. more-liberal agencies are sometimes willing to accept as accurate with election architectures. It isn't special for manufacturing corporations, dot-coms, and universities to subsist much less conservative. at last, some organizations just effect not faith windows as a mission-important environment and prefer to do employ of UNIX; this guidelines out some database providers (Microsoft SQL Server, in selected).
  • Benchmarks. What efficiency benchmarks are available from the DBMS vendor and other users of the DBMS? The Transaction Processing efficiency Council (TPC) publishes legit database efficiency benchmarks that may too subsist used as a tenet for the basic benchmark efficiency of numerous styles of database processing. (consult with the sidebar “The Transaction Processing efficiency Council” for greater details.) In familiar, performance benchmarks may too subsist helpful as a vast indicator of database performance however should now not subsist the best determinant when settling on a DBMS. lots of the TPC benchmarks are race against database implementations that don't appear to subsist consultant of most production database techniques and hence are not indicative of the specific efficiency of a specific DBMS. furthermore, benchmarks are at full times up-to-date to present new and stronger efficiency measurements for each and every of the most well-known DBMS items, rendering the benchmark “winners” out of date very rapidly.
  • Scalability. Does the DBMS capitalize the number of users and database sizes you map to set in force? How are massive databases built, supported, and maintained—easily or with lots of ache? Are there impartial clients who can verify the DBMS supplier’s scalability claims?
  • Availability of helping utility equipment. Are the assisting outfit you require available for the DBMS? These items may consist of query and analysis equipment, statistics warehousing support tools, database administration tools, backup and recovery equipment, efficiency-monitoring tools, means-planning equipment, database utilities, and support for numerous programming languages.
  • The Transaction Processing performance Council is an independent, now not-for-earnings organization that manages and administers efficiency benchmark tests. Its mission is to define transaction processing and database benchmarks to provide the traffic with purpose, verifiable performance facts. TPC benchmarks measure and evaluate desktop features and operations.

    The definition of transaction espoused through the TPC is a enterprise one. a customary TPC transaction comprises the database updates for things such as stock manage (goods), airline reservations (capabilities), and banking (money).

    The benchmarks produced by using the TPC measure performance when it comes to how many transactions a given gadget and database can operate per unit of time, as an example, variety of transactions per second. The TPC defines three benchmarks:

  • TPC-C, for planned production workload in a transaction environment
  • TPC-H, a convoke guide benchmark which comprise a set of company-oriented ad hoc queries and concurrent statistics changes
  • TPC-E, an updated OLTP workload (in accordance with economic transaction processing)
  • additional info and in-depth definitions of those benchmarks may too subsist discovered at the TPC net site at www.tpc.org (see figure 2.1).

  • Technicians. Is there a satisfactory supply of expert database professionals for the DBMS? believe your wants when it comes to DBAs, technical assist personnel (equipment programmers and administrators, operations analysts, and so on.), and software programmers.
  • cost of ownership. what's the total impregnate of possession of the DBMS? DBMS providers impregnate wildly various fees for his or her technology. complete impregnate of ownership should noiseless subsist calculated as a composite of the license impregnate of the DBMS; the license can impregnate of any required helping software; the can impregnate of database authorities to software, guide, and administer the DBMS; and the cost of the computing materials required to operate the DBMS.
  • unencumber agenda. How commonly does the DBMS dealer free up a new edition? Some providers believe speedily free up cycles, with new releases popping out every 12 to 18 months. This will too subsist marvelous or unhealthy, reckoning on your approach. in case you requisite cutting-aspect elements, a speedy unencumber cycle is first rate. despite the fact, if your shop is extra conservative, a DBMS that adjustments frequently will too subsist complicated to aid. A swift liberate cycle will trigger conservative corporations both to better extra frequently than they would fancy or to reside with out of date DBMS application it really is not likely to believe the identical stage of aid because the newest releases.
  • Reference consumers. Will the DBMS dealer give existing person references? are you able to locate different clients in your personal who might give greater neutral solutions? talk with current clients to elicit considerations and concerns you might too believe left out. How is aid? Does the dealer respond smartly to complications? effect issues generally travail as marketed? Are there a lot of bug fixes that requisite to subsist utilized continuously? what is the high-quality of latest releases? These questions may too subsist answered most efficient by means of the individuals in the trenches.
  • When settling on a DBMS, do sure to pick into consideration the complexity of the items. DBMS application is awfully advanced and is getting extra complicated with each new unencumber. functionality that used to subsist supported only with add-on software or independent courses is more and more being brought as elements of the DBMS, as proven in figure 2.2. you're going to deserve to map for and assist full of the aspects of the DBMS. even though there isn't any present requirement for positive points, when you set in obligate the DBMS the programmers and builders will discover a intent to do employ of very nearly anything else the supplier threw into it. it is stronger to map and subsist organized than to permit elements for employ without a map for aiding them.

    Figure 2.2

    determine 2.2. Convergence of features and performance in DBMS software

    DBMS Architectures

    The assisting structure for the DBMS environment is very well-known to the success of the database applications. One incorrect alternative or poorly implemented component of the basic architecture may antecedent atrocious efficiency, downtime, or unstable functions.

    When mainframes dominated traffic computing, DBMS architecture changed into a simpler problem. everything ran on the mainframe, and that become that. youngsters, nowadays the IT infrastructure is disbursed and heterogeneous. The universal architecture—even for a mainframe DBMS—will probably comprise dissimilar structures and interoperating gadget application. A group inclusive of traffic and IT consultants, in spot of a single person or community, should do the last structure choice. company experts should encompass representatives from a lot of departments, in addition to from accounting and criminal for application compress concerns. Database administration representatives (DA, DBA, and SA), as well as members of the networking neighborhood, operating system experts, operations ply personnel, programming consultants, and another involved events, should subsist protected in this crew.

    furthermore, subsist sure that the DBMS you opt for is applicable for the nature and benevolent of processing you intend to set into effect. 4 ranges of DBMS architecture can subsist found: commercial enterprise, departmental, very own, and cellular.

    An traffic DBMS is designed for scalability and tall performance. An enterprise DBMS must subsist in a position to assisting very significant databases, a huge number of concurrent clients, and varied styles of functions. The commercial enterprise DBMS runs on a large-scale desktop, typically a mainframe or a excessive-end server working UNIX, Linux, or windows Server. additionally, an commercial enterprise DBMS offers full the “bells and whistles” accessible from the DBMS vendor. Multiprocessor guide, guide for parallel queries, and different superior DBMS elements are core accessories of an commercial enterprise DBMS.

    A departmental DBMS, now and again referred to as a workgroup DBMS, serves the hub floor. The departmental DBMS supports small to medium-dimension workgroups within an organization; typically, it runs on a UNIX, Linux, or windows server. The dividing line between a departmental database server and an traffic database server is quite grey. Hardware and utility enhancements can permit a departmental DBMS to tackle projects that prior to now could subsist carried out simplest by means of an commercial enterprise DBMS. The steadily falling impregnate of departmental hardware and utility accessories additional contributes to decreasing the overall can impregnate of operation and enabling a workgroup environment to scale up to serve the enterprise.

    a private DBMS is designed for a single consumer, customarily on a low- to medium-powered computing device platform. Microsoft entry, SQLite, and FileMaker2 are examples of personal database software. Of course, the foremost DBMS vendors too market personal types of their larger-powered solutions, akin to Oracle Database very own version and DB2 very own version. every so often the competitively priced of a private DBMS effects in a faulty attempt to elect a personal DBMS for a departmental or commercial enterprise solution. besides the fact that children, effect not subsist lured via the competitively priced. a private DBMS product is usurp simplest for terribly small-scale projects and will by no means subsist deployed for multiuser purposes.

    ultimately, the mobile DBMS is a really marvelous version of a departmental or commercial enterprise DBMS. it's designed for far flung users who aren't constantly linked to the network. The mobile DBMS permits local database entry and amendment on a desktop or handheld device. in addition, the cell DBMS gives a mechanism for synchronizing far flung database changes to a centralized traffic or departmental database server.

    A DBMS designed for one classification of processing could subsist sick proper for other uses. for example, a private DBMS is not designed for multiple users, and an commercial enterprise DBMS is commonly too complicated for single clients. do sure to understand the changes amongst business, departmental, very own, and cell DBMS application, and determine the usurp DBMS for your specific data-processing needs. You may requisite to select multiple DBMS varieties—that is, a DBMS for each level—with usage decided by using the needs of each pile assignment.

    if your company requires DBMS solutions at different stages, elect the alternative of a gaggle of DBMS solutions from the identical vendor whenever possible. Doing so will lower alterations in entry, development, and administration. for instance, want Oracle Database personal edition to your single-user DBMS wants if your corporation makes employ of Oracle because the enterprise DBMS of option.

    DBMS Clustering

    Clustering is the employ of numerous “independent” computing programs working collectively as a single, particularly attainable device. a latest DBMS offers clustering guide to enhance availability and scalability. the two predominant architectures for clustering are shared-disk and shared-nothing. These names effect a superb job of describing the character of the architecture—at the least at a tall stage.

    Shared-nothing clustering is depicted in figure 2.3. In a shared-nothing architecture, every system has its own inner most resources (reminiscence, disks, and so on.). The clustered processors talk through passing messages through a community that interconnects the computer systems. additionally, requests from purchasers are immediately routed to the gadget that owns the aid. just one of the clustered systems can “personal” and access a selected useful resource at a time. within the event a failure happens, resource ownership may too subsist dynamically transferred to yet another system within the cluster. The main advantage of shared-nothing clustering is scalability. In thought, a shared-nothing multiprocessor can scale up to lots of processors as a result of they don't tamper with one an extra—nothing is shared.

    In a shared-disk ambiance, full of the connected methods share the identical disk instruments, as shown in figure 2.4. every processor noiseless has its own inner most reminiscence, but full the processors can without delay ply full of the disks. usually, shared-disk clustering doesn't scale as smartly for smaller machines as shared-nothing clustering. Shared-disk clustering is greater acceptable to big-business processing in a mainframe environment. Mainframes—very significant processors—are able to processing massive volumes of labor. extraordinary merits will too subsist received with simplest a pair of clustered mainframes, whereas many notebook and midrange processors would deserve to subsist clustered to obtain equivalent merits.

    Shared-disk clustering is constantly preferable for purposes and functions requiring most efficient modest shared entry to records and for purposes or workloads that are very problematic to partition. functions with massive data update requirements are likely more advantageous carried out as shared-nothing. desk 2.3 compares the capabilities of shared-disk and shared-nothing architectures.

    table 2.3. assessment of Shared-Disk and Shared-Nothing Architectures

    Shared-Disk

    Shared-Nothing

    quick adaptability to changing workloads

    Can do the most easier, more affordable hardware

    excessive availability

    practically unlimited scalability

    Performs surest in a massive examine ambiance

    Works smartly in a high-quantity, read-write atmosphere

    records don't requisite to subsist partitioned

    records is partitioned throughout the cluster

    The predominant DBMS vendors deliver aid for various kinds of clustering with diverse capabilities and necessities. as an example, DB2 for z/OS offers shared-disk clustering with its statistics Sharing and Parallel Sysplex capabilities; DB2 on non-mainframe systems makes employ of shared-nothing clustering. Oracle’s precise utility Clusters supply shared-disk clustering.

    for many users, the simple capitalize of clustering is the enhanced availability that accrues with the aid of combining processors. In some cases, clustering can support an enterprise to obtain 5-nines (ninety nine.999 percent) availability. additionally, clustering may too subsist used for load balancing and failover.

    DBMS Proliferation

    customarily of thumb, create a coverage (or at least some essential instructions) that should subsist adopted earlier than a brand new DBMS will too subsist brought into the firm. Failure to effect so can antecedent a proliferation of distinctive DBMS products that may subsist problematic to aid. it could actually additionally trigger confusion regarding which DBMS to do employ of for which construction effort.

    As mentioned previous, there's a plethora of DBMS providers, every touting its advantages. As a DBA, you can subsist bombarded with marketing and revenue efforts that try to convince you that you requisite one more DBMS. try to withstand unless a extremely compelling antecedent is given and a brief-term recur on investment (ROI) can too subsist established. Even when confronted with legitimate motives and respectable ROI, subsist sure to double-check the arguments and ROI calculations. now and again the motives special are old-fashioned and the ROI figures effect not pick every thing into consideration—such because the further cost of administration.

    be aware, each DBMS requires database administration support. furthermore, every DBMS makes employ of diverse how one can duty similar projects. the less DBMS products set in, the less complicated database administration turns into, and the greater your options circle into of featuring valuable records management materials to your organization.

    Hardware issues

    When establishing a database environment for utility development, identifying the DBMS is just fraction of the equation. The hardware and operating gadget on which the DBMS will race will enormously believe an effect on the reliability, availability, and scalability (RAS) of the database atmosphere. as an instance, a mainframe platform similar to an IBM zEC12 operating z/OS will probably give greater RAS than a midrange IBM xSeries computing device working AIX, which in flip will likely exceed a Dell server running windows. That is not to title every thing should noiseless race on a mainframe; other concerns such as can charge, journey, manageability, and the needs of the functions to subsist developed believe to subsist regarded. The ground line is that you just should do certain to ingredient hardware platform and working outfit constraints into the DBMS option criteria.

    Cloud Database methods

    Cloud computing (see the sidebar) is expanding in usage, principally at small to medium-dimension groups. A cloud implementation can too subsist more economical than pile a entire aboriginal computing infrastructure that requires management and aid.

    A cloud database device grants DBMS capabilities over the information superhighway. The exchange-off basically comes down to trusting a cloud provider to store and exploit your facts in recur for minimizing database administration and renovation cost and effort. using cloud database techniques can enable businesses, principally smaller ones without the supplies to set money into an enterprise computing infrastructure, to hub of attention on their traffic as an alternative of their computing ambiance.

    by way of consolidating statistics sources in the cloud, it is feasible to enlarge collaboration amongst partners, fork offices, far flung people, and mobile gadgets, because the statistics becomes purchasable as a service. There is not any deserve to set up, install, patch, or manage the DBMS utility since the cloud provider manages and cares for these administrative tasks. Of path, the draw back is that your data is now saved and controlled by using an exterior agent—the cloud issuer. an extra inherent possibility of cloud computing is the probability of nefarious brokers posing as answerable shoppers.

    An specimen of a cloud database platform is Microsoft SQL Azure. it is constructed on SQL Server applied sciences and is a fraction of the windows Azure platform.


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