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Test Code : C2020-605
Test cognomen : IBM Cognos 10 Controller Developer
Vendor cognomen : IBM
real questions : 94 existent Questions

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IBM Cognos 10 Controller Developer exam

appropriate 10 DB2 aid considerations | C2020-605 existent Questions and VCE exercise 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 their consumers. These situations latitude from the tragic to the downright bizarre, but each and every one can breathe avoided (or as a minimum mitigated) with the remedy approaches and techniques in area.

during this column, i might want to remove you on a brief tour of a few of my widely used DB2 assist incidents and war studies for Linux, UNIX and home windows. everything of those definitely happened, however I even acquire not noted some particulars with a view to maintain them suitably nameless. With thanks to the numerous Triton consultants that contributed, and nonetheless stand the scars of their involvement.

problem 1: The legislations of Unintended consequences

This one everything started (as many do) with a require support 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 limpid down the table, however could not breathe watchful why he'd been in a position to delete the rows as he will not acquire had the authority to Do so.

In everything such instances, the priority is everything the time to derive 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 acquire 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:

  • 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 everything the building, pre-construction and construction techniques. not superb 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 specimen with the password of the structure consumer.
  • Some months previous, a gadget administrator had been attempting to derive 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 befall at the records supply. So, it became feasible to connect to the database as any consumer with no exigency to derive 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 hypothetical if any one acquired the birthright username for the DB2 specimen proprietor then they could choose/add/delete any information they appreciated.
  • of course, the FED_NOAUTH parameter was everything of a sudden set again to NO and typical authentication checking was reinstated.

    lessons discovered: 

  • watch out for the law of unintended penalties: DB2 can moreover breathe a fancy beast, and there's a hazard in twiddling with device settings you Do not wholly remove into account. If doubtful, searching for skilled support.
  • alternate the default specimen 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 expend loads of time tuning databases and purposes, however how commonly Do they account about their own efficiency? Time and once more, they perceive examples of DBAs and profit body of workers that are taking the long route 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 all lot of individuals who are passionate supporters of the GUI, and indeed it can moreover breathe 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 facile script) will do a worthy deal extra sense. The job is then without hardship repeatable, actions and their consequences may moreover breathe 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 specimen is the activities process of merchandising database objects between building, contemplate 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 breathe used to examine database structures to ensure consistency.

    classes learned: 

  • With body of workers prices forming an increasingly great percentage of IT budgets, productiveness is becoming increasingly crucial. use the DB2 command line and scripting to totally or in section automate medium 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 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. habitual examples consist of Java frameworks, 3GLs and business intelligence materiel 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 profit 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 retort was quite simply to re-work the Cognos file definitions so as to add the missing database relationships. This led to Cognos to generate apposite breathe 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.

    training discovered: 

  • Many purposes (comparable to BI, ERP and Java frameworks) are generating their personal SQL – it will moreover breathe intricate to understand precisely what's getting thrown at DB2.
  • correct tooling (and potential to interpret them) is primary.
  • concern four: They don't exigency a DBA!

    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 materiel administration team looking after the OS help.

    Triton become originally contacted as a one-off activity, because the builders were complaining about continually poverty-stricken query performance and asking to movement to another RDBMS as DB2 turned into obviously not as much as the job. They establish a shockingly universal 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 exigency to breathe trained. so far as they were concerned, the database become a black field that they may throw 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 limpid of the identical considerations arising sooner or later.

    lessons realized:

  • builders can hardly derive 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 worthy instance of how "finger drawback" may occasions purple faces and application outage. The Senior DBA for an huge public capabilities software took his annual holiday, leaving a recently-educated Junior DBA in can charge. Responding to a request to limpid down a structure 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 profit 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.

    lessons discovered:

  • always breathe inevitable you are related to the birthright server. it's a superb suggestion to color code your GUI/Telnet classes so that you acquire an extra visual cue to support breathe inevitable you might breathe working on the usurp ambiance.
  • agree with limiting every day entry to production statistics to avoid accidents
  • Get apposite DBA cover for holiday/disease/being pregnant and so on. — relying on inexperienced body of workers may wait up in principal incidents.
  • subject 6: Do not contact the Logs!

    We got a frantic cognomen one evening from a client soliciting for instant support. DB2 had "hung" and no exercise may well breathe carried out on the creation database. because the OLTP materiel had a 24x7 on-line SLA, it turned into not astounding 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 breathe 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 vigorous 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 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 lore tried a number of "trick" DB2, like making a dummy log file with the identical cognomen as the missing one, now not figuring out that the DB2 transaction log data acquire header tips within them. After loads of delay, it became at eventual agreed to carry out a fix from the most concomitant backup. This proved a bit of a problem due to the fact no backups acquire been saved on disk. So, the remedy tape needed to breathe discovered and established. The repair and subsequent rollforward to a constant factor in time did effectively remove vicinity and sighs of reduction can breathe 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 account that he owned up to his mistake...

    instructions learned:

  • 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 moreover breathe establish via record the database configuration parameters. do completely bound you don't exigency 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, vigorous transaction logs, and many others., on the construction database server.
  • situation 7: As rotten as it receives

    here's a nightmare profit 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 former 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 distinguished one, with a couple of net dealing with apps counting on it for critical facets. To do 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 glad 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 proceed on for more than forty five days.

    The options available acquire 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 help 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 option 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 breathe scripted but needed to breathe 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. degree an achievement below the instances!

    instructions discovered:

  • See outdated problem for suggestions on log administration.
  • Be privy to superior restoration tools such as db2dart — they may moreover breathe lifesavers in extreme instances.
  • challenge 8: coping with Diagnostic statistics

    We commonly should quiz customers for the DB2 diagnostic log file (db2diag.log), handiest to learn "it's too stout to send" or "it's taking too lengthy to open." this is since the DB2 diagnostic information acquire been appended best on account that time immemorial, their boom most efficient restricted by the maximum house obtainable in the file gadget they wait in. The most efficient solution to curb this growth could breathe to rename the info, which would then compel the creation of latest ones. Scripts needed to breathe written to automate this procedure and to delete historic files after a undeniable period. Many customers didn't acquire these tactics in vicinity.

    With the creation of DB2 9.7, everything 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 sensible satisfactory to clean up former log info from the diagnostic log directory. When the 10th file is full, the oldest file is deleted, and a new file is created.

    instructions learned:

  • New facets are delivered in DB2 the entire time, by route of fixpaks and new releases. breathe inevitable you dwell on desirable of them, as they can do a great 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 breathe reclaim in "Rollforward Pending" State. Transactions gaining access to records in these tablespaces failed but the others were successful. The eventual sprint of the HADR state monitoring script indicated a Peer State, and for this intuition it become decided to matter a TAKEOVER command on the DR web site to change roles. When the application began, some transactions failed with the identical error 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 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? They went through the db2diag.log and the notification logs. They could perceive 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 breathe in "Peer" State. truly, some of the tablespaces were being ignored.

    classes learned:

  • 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 moreover affect that your "sizzling standby" system could breathe useless just if you befall to want it most.
  • situation 10: IBM aid tactics

    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 acquire 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 breathe scrabbling round to try to dig out consumer numbers and URLs for the IBM assist Portal. they now acquire 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 corroborate that you can contact them birthright away and efficiently if the exigency 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.

    classes realized:

  • understand your IBM consumer number and the route 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 huge info (dumps, diagnostic logs, and so forth.) to IBM.
  • i am hoping you'll breathe able to learn some thing from as a minimum some of these situations, and remove steps to avert identical situations going on in your ambiance.

    See everything articles by Julian Stuhler

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