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As considered one of Europe's leading suppliers of DB2 functions, my solid has been involved in a vast number of technical assist calls and incidents with their consumers. These situations latitude from the tragic to the downright bizarre, but each and every one can live avoided (or as a minimum mitigated) with the correct approaches and techniques in area.
during this column, i might want to grasp you on a brief tour of a few of my widely used DB2 assist incidents and war studies for Linux, UNIX and home windows. complete of those definitely happened, however I even fancy not notable some particulars with a view to maintain them suitably nameless. With thanks to the numerous Triton consultants that contributed, and nonetheless tolerate the scars of their involvement.problem 1: The legislations of Unintended consequences
This one complete started (as many do) with a demand advocate from considered one of their DB2 purchasers. the entire rows had been deleted from a vital desk in a pre-creation environment. The junior DBA had bravely admitted to unintentionally connecting to the inaccurate device to transparent down the table, however could not live conscious why he'd been in a position to delete the rows as he will not fancy had the authority to accomplish so.
In complete such instances, the priority is complete the time to Get the facts back and the developers working once again. This became without delay achieved with a common recovery the usage of a fresh backup and no complications fancy been encountered. They then grew to become their attention to the project of identifying how the junior DBA had been able to delete the statistics within the first vicinity.
After tons investigation, they establish out here:
of course, the FED_NOAUTH parameter was complete of a sudden set again to NO and typical authentication checking was reinstated.
many people disburse loads of time tuning databases and purposes, however how commonly accomplish they deem about their own efficiency? Time and once more, they view examples of DBAs and assist body of workers that are taking the long pass round and the usage of extra time than fundamental to operate pursuits initiatives. One particular constituent of here's the utilize of the command line versus a GUI such because the DB2 manage middle.
i know a entire lot of individuals who are passionate supporters of the GUI, and indeed it can too live an excellent technique to directly accomplish one-off activities similar to an ad-hoc reorg. although, there are a lot of cases the plot utilize of the command line (or more suitable still, DB2 commands embedded in an effortless script) will fabricate a worthy deal extra sense. The task is then without difficulty repeatable, actions and their consequences may too live recorded (via redirecting the output to a textual content file), and a script is a worthy deal simpler to hand over to a colleague than pages of instructions and GUI screenshots!
a common illustration is the activities process of merchandising database objects between building, notice at various and creation environments. an excellent script can accomplish that project in a fraction of the time crucial to accomplish the equal issue from the GUI, and utilities similar to db2look can live used to examine database structures to ensure consistency.
many people are working in environments the plot the SQL offered to DB2 is not written at once with the aid of a human being, however generated immediately with the aid of a device. habitual examples consist of Java frameworks, 3GLs and industry intelligence rig reminiscent of Cognos during this example.
during this instance, the customer pronounced an extended elapsed time for a Cognos-generated query (over 30 minutes) operating towards a DB2 9.5 database, with the query always failing as a result of the DB2 temp house being handed. The clients repeatedly extended the temp space and re-tried the question, but with exactly the same result each and every time. In desperation they even ran the DB2 Index advisor and created additional indexes, however temp space nonetheless blew earlier than the question accomplished.
A assist incident turned into opened, and evaluation the utilize of a third-party question monitoring device confirmed a extremely tall question execution cost. further examination of the genuine SQL being generated by Cognos confirmed a Cartesian connect of two tables, every with more than 25M rows in, with the brand new indexes now not getting used in any respect. Going back to the Cognos definitions confirmed a key database relationship had now not been described to Cognos, so it had to filter monstrous amounts of facts in the neighborhood.
The respond was quite simply to re-work the Cognos file definitions so as to add the missing database relationships. This led to Cognos to generate apropos live a piece of predicates and the experiences ran to a success completion in beneath 2 minutes. The developers had been additionally informed to examine both the Cognos and generated "native" SQL in the future.
This specific problem happened in a construction atmosphere the plot DB2 for LUW 9.7 became the returned-conclusion database, but it might in reality had been every other RDBMS. A tremendously-knowledgeable offshore group became setting up a new application, with a endemic rig administration team looking after the OS help.
Triton become originally contacted as a one-off activity, because the builders were complaining about continually needy query performance and asking to movement to another RDBMS as DB2 turned into obviously not as much as the job. They establish a shockingly general circumstance: the group of developers, totally skilled in SQL and in a position to formulate advanced queries, had been fully focused on the application code and no person changed into looking after the information. consequently, there was no backup regime in area, no RUNSTATS or other housekeeping, and the most efficient indexes were simple ones created when the database was first designed. now not miraculous then that the query performance had been so negative — not one of the tables had ever had stats collected.
further questioning published that the developers had no DB2-certain potential in anyway, and no need to live trained. so far as they were concerned, the database become a black province that they may sling SQL at and Get facts again.
We quickly applied a primary set of automated housekeeping methods that resolved the efficiency considerations and made the developers satisfied. despite the fact, in the technique they uncovered a lot of statistics exceptional concerns (equivalent to developers coding inefficient SQL to Get round replica statistics that shouldn't exist). A greater formal design evaluate of the database was performed, and they were requested to provide an ongoing faraway DBA provider to steer transparent of the same considerations arising sooner or later.
this is a worthy instance of how "finger drawback" may antecedent purple faces and application outage. The Senior DBA for an mammoth public capabilities software took his annual holiday, leaving a recently-educated Junior DBA in can charge. Responding to a request to transparent down a edifice database, the Junior DBA fired up his telnet session, dropped and re-created the principal database and congratulated himself on a job smartly finished ... until the telephones begun ringing with clients complaining that they could not utilize the creation application. The DBA had unintentionally dropped a captious creation database, pondering that he was connected to the UAT gadget.
To his credit score, the DBA was quick to promote spotless with the mistake and Triton became referred to as in to assist with the recovery. This become carried out with out extra drama, but the better piece of a industry day had been misplaced by the time every thing turned into returned to ordinary.
We got a frantic cognomen one evening from a client soliciting for instant support. DB2 had "hung" and no exercise may well live carried out on the creation database. because the OLTP rig had a 24x7 on-line SLA, it turned into not wonderful that the senior administration become waiting once they arrived at the consumer website. Upon investigation, it grew to become obvious that DB2 became trying to find an energetic transaction log file that had long past "missing" and became nowhere to live discovered.
After investigation, the memoir started to develop into clearer. In a determined try to create some space on the construction database server, a junior sysadm had stumbled upon the DB2 transaction log listing (which in this case housed each the vigorous and archived logs) and idea, "Hmm, this listing could accomplish with some clean-up." using his judgment of the age of the info, he deleted some of them. He won area but regrettably lost an vigorous transaction log file in the system.
despite their suggestions that a restore from a outdated backup changed into the best solution to their difficulty, the local Oracle DBA with some DB2 information tried a number of "trick" DB2, fancy making a dummy log file with the identical cognomen as the missing one, now not figuring out that the DB2 transaction log data fancy header tips within them. After loads of delay, it became at final agreed to carry out a fix from the most contemporaneous backup. This proved a bit of a problem due to the fact no backups fancy been saved on disk. So, the correct tape needed to live discovered and established. The repair and subsequent rollforward to a constant factor in time did effectively grasp vicinity and sighs of reduction can live heard within the early morning hours. despite the fact that some hours of company had been lost, jobs had been saved! And sure, even the junior sysadm turned into allowed to reside on when you deem that he owned up to his mistake...
here's a nightmare assist state of affairs: a damaged database on an unsupported version of DB2, with out a backups or log files to Get better the database.
An misguided script had deleted just a few transaction log information that had a 'closing changed' date of greater than 45 days. The same script had caused different mistakes and a database restart turned into required, but the database didn't delivery. The database changed into trying to find an faded log file, which had just been deleted through the script. because the coverage turned into to retain the backups and archive logs for 30 days, this log file changed into deleted from the archive logs too.
The database changed into tiny — less than 50GB. nevertheless, it changed into a really Important one, with a yoke of net dealing with apps counting on it for captious facets. To fabricate concerns worse, the edition of DB2 in utilize had passed its "conclusion of carrier" date, so DB2 advocate become not inclined to examine (notwithstanding they had been ecstatic to book).
after they bought concerned a few hours after the incident, panic had set in. in line with assistance available (saved snapshots and db2diag.log file), they had been able to conclude that there turned into a transaction which begun within the log file the database turned into hunting for. This transaction become never completed. The cost of trade of facts become so small, the configured log numbers may travel on for more than forty five days.
The options available fancy been to extract the information from the newest backup picture (using tools fancy tall performance sell off) or extract the facts from the damaged database (using db2dart). The latter alternative become chosen as this is able to enable us to ameliorate essentially the most contemporaneous data.
without further extend, they ran db2dart on the database to check for any blunders and to Get the Tablespaceid, Tableid and the total variety of pages allocated to each and every table. They were then in a position to utilize the guidance to construct the db2dart command with the DDEL alternative to extract the records in delimited layout. db2dart with the DDEL selection is interactive (i.e., when the command is run, it prompts for the tablesapce id, tableid and the web page compass to extract the information). This intended that the extract could not live scripted but needed to live executed manually for every of the 300+ tables.
as soon as that mind-numbing project turned into comprehensive, they created a new database with the DDL that become obtainable (fortuitously, that they had a db2look output from the construction database below a week before the incident). finally, they loaded the extracted statistics to the new database and ran runstats on the desk and indexes.
After just a few hiccups and 15 hrs of db2dart, import/load, runstats and facts fixes, the database changed into accessible for the software. The database became down for more than 20 hours, but it became lower back in once piece with very nearly no statistics loss. benign of an achievement below the instances!
We commonly should query customers for the DB2 diagnostic log file (db2diag.log), handiest to learn "it's too vast to send" or "it's taking too lengthy to open." this is since the DB2 diagnostic information fancy been appended best on account that time immemorial, their boom most efficient restricted by the maximum house obtainable in the file gadget they remain in. The most efficient solution to curb this growth could live to rename the info, which would then obligate the creation of latest ones. Scripts needed to live written to automate this procedure and to delete historic files after a undeniable period. Many customers didn't fancy these tactics in vicinity.
With the creation of DB2 9.7, complete here is now history! the new DIAGSIZE database manager parameter allows for a DBA to control the optimum sizes of the DB2 diagnostic log and administration notification log data. When this parameter is decided to a non-zero charge (which is the default pre-DB2 9.7 behaviour), a sequence of 10 rotating diagnostic log files and rotating administration notification log info (only on UNIX and Linux) are used. it is additionally wise satisfactory to spotless up faded log info from the diagnostic log directory. When the 10th file is full, the oldest file is deleted, and a new file is created.
The customer changed into the usage of HADR to a remote server for resilience, running in ASYNC mode to minimize the efficiency affect. No cluster utility changed into used for monitoring/failover, however the HADR state become being monitored on a daily basis the utilize of a shell script.
On the basic web page, a number of disks failed, which brought about probably the most tablespaces to live Put in "Rollforward Pending" State. Transactions gaining access to records in these tablespaces failed but the others were successful. The final flee of the HADR state monitoring script indicated a Peer State, and for this intuition it become decided to subject a TAKEOVER command on the DR web site to change roles. When the application began, some transactions failed with the same mistake as on the fundamental website — not respectable!
a list tablespaces command confirmed a few tables in "Rollforward Pending" state. To Get out of the pending state, the ROLLFORWARD command turned into issued with the record of affected tablespaces. The rollforward was trying a retrieve a log, which changed into a few thousand logs older than the current one. not exceptionally, this log became not attainable within the archive. After a yoke of more tries, the ROLLFORWARD option turned into given up and the database became restored from the latest backup image and the application began.
So what happened? They went through the db2diag.log and the notification logs. They could view that there were actual errors stated in one of the vital tablespaces on the DR website (HADR Standby) around a hundred days earlier than the incident. This turned into said within the db2diag.log, and the affected tablespaces had been "excluded from the rollforward set." according to other entries in the db2diag file, they were capable of verify that the log file requested for rollforward on the DR web site was used at the time the actual mistakes took plot there. HADR continued to apply logs for the other tablespaces and became reporting to live in "Peer" State. truly, some of the tablespaces were being ignored.
i may round off my precise ten with probably the most simple concerns they stumble upon, however regrettably one of the most regular. or not it's astonishing how many DB2 websites would not fancy basic techniques in location for contacting IBM assist within the event of a major DB2 challenge.
if you are having a earnest creation issue and you want IBM's counsel, each minute is a must-have. That isn't the time to live scrabbling round to try to dig out consumer numbers and URLs for the IBM assist Portal. they now fancy even considered situations where the IBM advocate site is blocked through the industry enterprise's internet looking coverage!
IBM is frequently satisfied that you should open "examine" PMRs to prove that the procedure works and verify that you can contact them right away and efficiently if the need arises. eventually, recollect that it's feasible in your IBM enterprise accomplice to open and control your PMRs for you — they try this for many of their valued clientele as a count of route.
i am hoping you'll live able to learn some thing from as a minimum some of these situations, and grasp steps to prevent identical situations going on in your ambiance.
See complete articles by Julian Stuhler
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