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As considered one of Europe's leading suppliers of DB2 functions, my firm 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 exist avoided (or as a minimum mitigated) with the redress approaches and techniques in area.
during this column, i might want to select you on a brief tour of a few of my widely used DB2 assist incidents and war studies for Linux, UNIX and home windows. bar not anything of those definitely happened, however I even gain not preeminent some particulars with a view to maintain them suitably nameless. With thanks to the numerous Triton consultants that contributed, and nonetheless bear the scars of their involvement.problem 1: The legislations of Unintended consequences
This one bar not anything started (as many do) with a require 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 pellucid down the table, however could not exist watchful why he'd been in a position to delete the rows as he will not gain had the authority to conclude so.
In bar not anything such instances, the priority is bar not anything the time to derive the facts back and the developers working once again. This became without retard achieved with a common recovery the usage of a fresh backup and no complications gain 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 found out here:
of course, the FED_NOAUTH parameter was bar not anything 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 conclude they respect about their own efficiency? Time and once more, they contemplate examples of DBAs and aid corpse of workers that are taking the long course round and the usage of extra time than fundamental to operate pursuits initiatives. One particular ingredient of here's the use of the command line versus a GUI such because the DB2 manage middle.
i know a total lot of individuals who are passionate supporters of the GUI, and indeed it can too exist an excellent technique to directly accomplish one-off activities similar to an ad-hoc reorg. although, there are a lot of cases the state use of the command line (or more suitable still, DB2 commands embedded in an smooth script) will earn a Great deal extra sense. The assignment is then without difficulty repeatable, actions and their consequences may too exist recorded (via redirecting the output to a textual content file), and a script is a Great deal simpler to hand over to a colleague than pages of instructions and GUI screenshots!
a common instance is the activities process of merchandising database objects between building, gawk at various and creation environments. an excellent script can accomplish that project in a fraction of the time crucial to conclude the equal issue from the GUI, and utilities similar to db2look can exist used to examine database structures to ensure consistency.
many people are working in environments the state 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. customary examples consist of Java frameworks, 3GLs and business 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 identical 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 aid incident turned into opened, and evaluation the use 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 associate 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 concede 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 exist a section 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 state 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 autochthonous rig administration team looking after the OS help.
Triton become originally contacted as a one-off activity, because the builders were complaining about continually poor query performance and asking to movement to another RDBMS as DB2 turned into obviously not as much as the job. They found 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 efficacious 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 necessity to exist trained. so far as they were concerned, the database become a black sphere that they may pitch SQL at and derive 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 derive 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 pellucid of the identical considerations arising sooner or later.
this is a Great 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 pellucid down a building 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 use the creation application. The DBA had unintentionally dropped a faultfinding creation database, pondering that he was connected to the UAT gadget.
To his credit score, the DBA was quick to arrive spotless with the mistake and Triton became referred to as in to aid with the recovery. This become carried out with out extra drama, but the better section of a business 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 exist carried out on the creation database. because the OLTP rig had a 24x7 on-line SLA, it turned into not astonishing 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 exist discovered.
After investigation, the tale 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 active and archived logs) and idea, "Hmm, this listing could conclude with some clean-up." using his judgment of the age of the info, he deleted some of them. He won belt but regrettably lost an active 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 knowledge 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 gain header tips within them. After loads of delay, it became at last agreed to carry out a fix from the most concomitant backup. This proved a bit of a problem due to the fact no backups gain been saved on disk. So, the redress tape needed to exist discovered and established. The repair and subsequent rollforward to a constant factor in time did effectively select vicinity and sighs of reduction can exist 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 respect that he owned up to his mistake...
here's a nightmare aid state of affairs: a damaged database on an unsupported version of DB2, with out a backups or log files to derive 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 identical 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 primitive 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 notable one, with a yoke of net dealing with apps counting on it for faultfinding facets. To earn concerns worse, the edition of DB2 in use had passed its "conclusion of carrier" date, so DB2 advocate become not inclined to examine (notwithstanding they had been cheerful 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 glide on for more than forty five days.
The options available gain 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 better essentially the most concomitant data.
without further extend, they ran db2dart on the database to check for any blunders and to derive the Tablespaceid, Tableid and the total variety of pages allocated to each and every table. They were then in a position to use the guidance to construct the db2dart command with the DDEL alternative to extract the records in delimited layout. db2dart with the DDEL choice is interactive (i.e., when the command is run, it prompts for the tablesapce id, tableid and the web page sweep to extract the information). This intended that the extract could not exist scripted but needed to exist 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. not much an achievement below the instances!
We commonly should inquire customers for the DB2 diagnostic log file (db2diag.log), handiest to learn "it's too grandiose to send" or "it's taking too lengthy to open." this is since the DB2 diagnostic information gain been appended best on account that time immemorial, their boom most efficacious restricted by the maximum house obtainable in the file gadget they stay in. The most efficacious solution to curb this growth could exist to rename the info, which would then compel the creation of latest ones. Scripts needed to exist written to automate this procedure and to delete historic files after a undeniable period. Many customers didn't gain these tactics in vicinity.
With the creation of DB2 9.7, bar not anything 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 expense (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 sane satisfactory to spotless up primitive 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 use of a shell script.
On the basic web page, a number of disks failed, which brought about probably the most tablespaces to exist set aside in "Rollforward Pending" State. Transactions gaining access to records in these tablespaces failed but the others were successful. The last 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 identical oversight as on the fundamental website — not respectable!
a list tablespaces command confirmed a few tables in "Rollforward Pending" state. To derive 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 contemplate 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 state there. HADR continued to apply logs for the other tablespaces and became reporting to exist 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 gain basic techniques in location for contacting IBM assist within the event of a major DB2 challenge.
if you are having a grave creation issue and you want IBM's counsel, each minute is a must-have. That isn't the time to exist scrabbling round to try to dig out consumer numbers and URLs for the IBM assist Portal. they now gain even considered situations where the IBM advocate site is blocked through the business enterprise's internet looking coverage!
IBM is frequently satisfied that you should open "examine" PMRs to prove that the procedure works and authenticate that you can contact them privilege away and efficiently if the necessity arises. eventually, bethink 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 import of route.
i am hoping you'll exist able to learn some thing from as a minimum some of these situations, and select steps to forestall identical situations going on in your ambiance.
See bar not anything articles by Julian Stuhler
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