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When creating a company, the administrator selects a consolidation type. What does the consolidation type allow the administrator to do?
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IBM Cognos 10 Controller Developer exam
appropriate 10 DB2 aid considerations | C2020-605 Real Questions and VCE Practice Test
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 our consumers. These situations latitude from the tragic to the downright bizarre, but each and every one can be avoided (or as a minimum mitigated) with the correct approaches and techniques in area.
during this column, i might want to take you on a brief tour of a few of my widely used DB2 assist incidents and war studies for Linux, UNIX and home windows. All of those definitely happened, however I even have not noted 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 all started (as many do) with a demand support from considered one of our 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 clear down the table, however could not be aware why he'd been in a position to delete the rows as he will not have had the authority to do so.
In all such instances, the priority is all 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 have been encountered. We then grew to become our attention to the project of identifying how the junior DBA had been able to delete the statistics within the first vicinity.
After tons investigation, we found out here:
The junior DBA has linked to the inaccurate DB2 illustration by means of mistake, the usage of an instance proprietor userid that turned into common to all the building, pre-construction and construction techniques. not good follow, but at the least the passwords had been distinctive on every — which nevertheless left the question of why he'd been capable of connect to the pre-construction example with the password of the building consumer.
Some months previous, a gadget administrator had been attempting to get federation to work and in addition to enabling the FEDERATED database supervisor parameter, the FED_NOAUTH (skip federated authentication) parameter had additionally been set to sure.
When FED_NOAUTH is decided to sure, FEDERATED is set to sure, and authentication is set to SERVER or SERVER_ENCRYPT, authentication at the illustration is bypassed, as it is believed that authentication will happen at the records supply. So, it became feasible to connect to the database as any consumer with no need to get the password right! as soon as related to the database, you simplest had access to the tables that the person (community) had entry to. despite the fact, this supposed if any one acquired the right username for the DB2 example proprietor then they could choose/add/delete any information they appreciated.
of course, the FED_NOAUTH parameter was all of a sudden set again to NO and typical authentication checking was reinstated.
watch out for the law of unintended penalties: DB2 can also be a fancy beast, and there's a hazard in twiddling with device settings you do not wholly take into account. If doubtful, searching for skilled support.
alternate the default example proprietor, and use different owners for building, pre-creation and production environments to avoid unintentionally connecting to the incorrect system. subject 2: DBA efficiency is critical Too
many people spend loads of time tuning databases and purposes, however how commonly do we consider about our own efficiency? Time and once more, we see examples of DBAs and help body of workers that are taking the long way round and the usage of extra time than fundamental to operate pursuits initiatives. One particular element of here's the use of the command line versus a GUI such because the DB2 manage middle.
i know a whole lot of individuals who are passionate supporters of the GUI, and indeed it can also be an excellent technique to directly accomplish one-off activities similar to an ad-hoc reorg. although, there are a lot of cases the place use of the command line (or more suitable still, DB2 commands embedded in an easy script) will make a great deal extra sense. The task is then without difficulty repeatable, actions and their consequences may also be 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 example is the activities process of merchandising database objects between building, look at various and creation environments. an excellent script can accomplish that project in a fraction of the time crucial to do the equal issue from the GUI, and utilities similar to db2look can be used to examine database structures to ensure consistency.
With body of workers prices forming an increasingly large percentage of IT budgets, productiveness is becoming increasingly crucial. Use the DB2 command line and scripting to totally or in part automate average activities to in the reduction of human error and pressure down the elapsed time crucial to comprehensive them. problem three: watch out for the SQL Generator
many people are working in environments the place 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. usual examples consist of Java frameworks, 3GLs and business intelligence equipment 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 help incident turned into opened, and evaluation the use of a third-party question monitoring device confirmed a extremely high question execution cost. further examination of the genuine SQL being generated by Cognos confirmed a Cartesian join 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 answer was quite simply to re-work the Cognos file definitions so as to add the missing database relationships. This led to Cognos to generate relevant be a part 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.
Many purposes (comparable to BI, ERP and Java frameworks) are generating their personal SQL – it will also be elaborate to understand precisely what's getting thrown at DB2.
correct tooling (and potential to interpret them) is primary. concern four: We don't need a DBA!
This specific problem happened in a construction atmosphere the place 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 native equipment 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. We 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 effective 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 be trained. so far as they were concerned, the database become a black field that they may throw 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 we 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 we were requested to provide an ongoing faraway DBA provider to steer clear of the same considerations arising sooner or later.
builders can hardly get away with searching at the database as a widespread black box — specific talents is required to obtain the optimal efficiency.
knowledgeable builders aren't satisfactory — a DBA is needed for most functions, otherwise efficiency or records integrity will usually endure. difficulty 5: When the Senior DBA is Away...
this is a great instance of how "finger drawback" may cause purple faces and application outage. The Senior DBA for an enormous public capabilities software took his annual holiday, leaving a recently-educated Junior DBA in can charge. Responding to a request to clear 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 critical creation database, pondering that he was connected to the UAT gadget.
To his credit score, the DBA was quick to come clean with the mistake and Triton became referred to as in to help with the recovery. This become carried out with out extra drama, but the better part of a business day had been misplaced by the time every thing turned into returned to ordinary.
always be certain you are related to the right server. it's a good suggestion to color code your GUI/Telnet classes so that you have an extra visual cue to support be certain you might be working on the appropriate ambiance.
agree with limiting every day entry to production statistics to avoid accidents
Get relevant DBA cover for holiday/disease/being pregnant and so on. — relying on inexperienced body of workers may end up in principal incidents. subject 6: do not contact the Logs!
We got a frantic name one evening from a client soliciting for instant support. DB2 had "hung" and no exercise may well be carried out on the creation database. because the OLTP equipment had a 24x7 on-line SLA, it turned into not amazing that the senior administration become waiting once we 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 be discovered.
After investigation, the story 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 do 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 active transaction log file in the system.
despite our 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, like making a dummy log file with the identical name as the missing one, now not figuring out that the DB2 transaction log data have header tips within them. After loads of delay, it became at last agreed to carry out a fix from the most contemporary backup. This proved a bit of a problem due to the fact no backups have been saved on disk. So, the correct tape needed to be discovered and established. The repair and subsequent rollforward to a constant factor in time did effectively take vicinity and sighs of reduction can be 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 consider that he owned up to his mistake...
do not contact the lively log listing.
Configure a log archiving strategy that archives log info to a special region than that of the energetic log listing.
Have a scheduled clean up technique for the archive log listing.
probably the most fresh energetic transaction log file can also be found via record the database configuration parameters. Make completely bound you don't need a log file before deleting it.
If possible, hold as a minimum one backup image on disk.
do not provide permissions to any Joe Blow to entry tablespace information, active transaction logs, and many others., on the construction database server. situation 7: As bad as it receives
here's a nightmare help 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 old 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 couple of net dealing with apps counting on it for critical facets. To make concerns worse, the edition of DB2 in use had passed its "conclusion of carrier" date, so DB2 support become not inclined to examine (notwithstanding they had been happy to book).
after we bought concerned a few hours after the incident, panic had set in. in line with assistance available (saved snapshots and db2diag.log file), we 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 go on for more than forty five days.
The options available have been to extract the information from the newest backup picture (using tools like high 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 improve essentially the most contemporary data.
without further extend, we 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. We 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 range to extract the information). This intended that the extract could not be scripted but needed to be executed manually for every of the 300+ tables.
as soon as that mind-numbing project turned into comprehensive, we 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, we 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. somewhat an achievement below the instances!
See outdated problem for suggestions on log administration.
Be privy to superior restoration tools such as db2dart — they may also be lifesavers in extreme instances. challenge 8: coping with Diagnostic statistics
We commonly should ask customers for the DB2 diagnostic log file (db2diag.log), handiest to learn "it's too big to send" or "it's taking too lengthy to open." this is since the DB2 diagnostic information have been appended best on account that time immemorial, their boom most effective restricted by the maximum house obtainable in the file gadget they stay in. The most effective solution to curb this growth could be to rename the info, which would then force the creation of latest ones. Scripts needed to be written to automate this procedure and to delete historic files after a undeniable period. Many customers didn't have these tactics in vicinity.
With the creation of DB2 9.7, all 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 price (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 clean up old log info from the diagnostic log directory. When the 10th file is full, the oldest file is deleted, and a new file is created.
New facets are delivered in DB2 the entire time, by way of fixpaks and new releases. be certain you dwell on desirable of them, as they can make a large change. subject 9: HADR problems
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 be put in "Rollforward Pending" State. Transactions gaining access to records in these tablespaces failed but the others were successful. The last run of the HADR State monitoring script indicated a Peer State, and for this reason 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 error 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 couple 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? We went through the db2diag.log and the notification logs. We could see 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, we 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 place there. HADR continued to apply logs for the other tablespaces and became reporting to be in "Peer" State. truly, some of the tablespaces were being ignored.
regular monitoring on the log files is primary to determine and unravel any considerations on the DR web site in strengthen of any incident. Failure to do so might also mean that your "sizzling standby" system could be useless just if you happen to want it most. situation 10: IBM aid tactics
i may round off my precise ten with probably the most simple concerns we stumble upon, however regrettably one of the most regular. or not it's astonishing how many DB2 websites would not have basic techniques in location for contacting IBM assist within the event of a major DB2 challenge.
if you are having a serious creation issue and you want IBM's counsel, each minute is a must-have. That isn't the time to be scrabbling round to try to dig out consumer numbers and URLs for the IBM assist Portal. we now have even considered situations where the IBM support 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 confirm that you can contact them right away and efficiently if the need arises. eventually, remember that it's feasible in your IBM enterprise accomplice to open and control your PMRs for you — we try this for many of our valued clientele as a count of route.
understand your IBM consumer number and the way to carry and song PMRs the use of the guide Portal.
If indispensable, open a "test" PMR to prove the manner works easily — specifically after adjustments to your web infrastructure (browser enhancements, new information superhighway firewall policy, etc.).
Have a confirmed system in region for transmitting enormous info (dumps, diagnostic logs, and so forth.) to IBM.
i am hoping you'll be able to learn some thing from as a minimum some of these situations, and take steps to prevent identical situations going on in your ambiance.
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