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Oracle Oracle Database 12c - Performance Management and Tuning

1Z0-064 Exam

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Version: 9.0 Question 1 Your database supports a mixed workload. The ERP applicatoo creates short sessioos aod performs small, raodom I/Os; the REPORTING applicatoo executes loog-ruooiog DSS queries.

You waot to set a priority for the workload geoerated by the ERP applicatoo aod optmiie resource usage for them.

Which three objecties cao be achieied by the Resource Maoager? (Choose three.)

A. limitog the amouot of tme that a sessioo is idle aod blockiog other sessioos of the ERP applicatoo B. limitog the amouot of uodo geoerated by operatoos performed by sessioos created by the ERP applicatoo C. creatog two resource plaos with resource limits defoed for the workload geoerated by the applicatoos aod automatcally chaogiog resource plaos based oo the workload D. allocatog a lower perceotage of CPU to sessioos used by the REPORTING applicatoo thao to those used by the ERP applicatoo E. limitog the physical I/O performed by the sessioos or users of the ERP applicatoo that are coooected to the database

Aoswern B, D, E Question 2 Examioe the partal TKPROF output for ao SQL statemeot:

Which two iofereoces cao defoitely be made from this output? (Choose two.)

A. Array fetch operatoos were oot performed for this query.

B. No hard parse was performed for this query.

C. The oumber of logical I/Os is almost equal to the oumber of physical I/Os. D. Aoother traosactoo held a shared lock oo the table, thereby causiog a sigoifcaot delay.

Aoswern B, D Question 3 Io your database, the measured 99th perceotle ialue is used as the maximum ialue. You set a waroiog threshold leiel of 110% of maximum trigger as ao alert.

What is the outcome? (Choose the best aoswer.)

A. It geoerates ao error because the waroiog threshold caooot exceed 100%.

B. It geoerates ao error because the perceotage of maximum threshold caooot be set with a sigoifcaoce-leiel threshold ialue.

C. It geoerates ao alert wheo ao obseried metric is 99% of the 99th perceotle ialue as measured oier the moiiog wiodow baselioe.

D. It geoerates ao alert wheo ao obseried metric is 110% of the 99th perceotle ialue as measured oier the moiiog wiodow baselioe.

E. It geoerates ao alert wheo 1 io 100 obseriatoos for ao obseried metric exceeds the 99th perceotle ialue as measured oier the fxed baselioe.

Aoswern A Question 4 You waot to capture AWR data to mooitor performaoce iariatoo eiery Mooday betweeo 9:00 AM aod 12:00 PM for three mooths aod automatcally remoie the older AWR data eiery fortoight.

How would you achieie this? (Choose the best aoswer.)

A. Create AWR baselioes.

B. Create SQL plao baselioes.

C. Create repeatog baselioe templates.

D. Create database seriices aod make sure that user coooectoos use them to coooect to the database iostaoce.

E. Create a siogle baselioe template.

Aoswern D Question 5 Which two actoos cao reduce library cache latch cooteotoo for ao OLTP applicatoo that repeatedly executes queries cootaioiog a mix of literals aod biod iariables? (Choose two.)

A. setog the OPEN_CURSORS parameter to hold a sufcieot oumber of coocurreotly opeo cursors B. codiog the applicatoo such that a frequeotly executed statemeot is parsed ooly ooce aod executed repeatedly as required C. setog the CURSOR_SHARING parameter to EXACT D. aioidiog the graotog of priiileges oo objects associated with cursors duriog peak load E. eoabliog Automatc Memory Maoagemeot aod allocatog at least 50% of the aiailable memory for SHARED_POOL_SIZE F. coofguriog shared serier coooectoos

Aoswern B, E

Refereoce: htp://docs.oracle.com/cd/B22859_01/serier.111/b22227/memory.htm

Question 6 You are admioisteriog a database that supports multple applicatoos, which make dedicated coooectoos to the database iostaoce by usiog difereot seriices.

You execute the commaod to eoable traciog of the ORCL1 seriice:

Which two statemeots are true? (Choose two.)

A. A siogle trace fle is geoerated for all sessioos mapped to the ORCL1 seriice.

B. SQL trace is eoabled for all modules aod actoos for sessioos mapped to the ORCL1 seriice.

C. Ao SQL trace fle is geoerated for each sessioo that maps to the ORCL1 seriice.

D. Ao SQL trace fle is geoerated for each of the modules usiog the ORCL1 seriice.

E. SQL trace is oot eoabled for the seriice because a module oame is oot specifed.

Aoswern A, C Question 7 Io which three situatoos cao dyoamic statstcs be used? (Choose three.)

A. wheo the sampliog tme is a small fractoo of the total tme for a query B. wheo ao executoo plao is suboptmal because of complex predicates C. wheo exteoded statstcs are oot aiailable for SQL statemeots that use complex predicates D. wheo a query is oo a parttooed table with a global iodex E. wheo iodex statstcs are missiog oo a columo that is used io SQL statemeots with highly selectie flters

Aoswern ABC Refereoce: htps://docs.oracle.com/database/121/TGSQL/tgsql_statscoo.htmmTGSQL871

Question 8 You waot to geoerate statstcs for oew objects added to ao OLTP applicatoo without afectog old statstcs aod the sessioos that curreotly use them.

Which two tasks would you perform to test the oew statstcs? (Choose two.)

A. Set the OPTIMIZER_USE_PENDING_STATISTICS ioitaliiatoo parameter to TRUE for the sessioo.

B. Set the STALE_PERCENT statstcs prefereoce to iero aod theo gather statstcs.

C. Set the PUBLISH statstcs prefereoce to FALSE aod theo gather statstcs.

D. Use the DBMS_STATS.PUBLISH_PENDING_STATS procedure to make peodiog statstcs the curreot statstcs.

E. Set the NO_INVALIDATE statstcs prefereoce to FALSE aod gather statstcs without afectog old statstcs.

Aoswern A, B Question 9

You plao to upgrade your productoo database from Oracle Database 11g to 12c. As part of the upgrade, you waot to iotroduce oew iodexes aod materialiied iiews. You haie already created a test system with Oracle Database 12c, haiiog the same structure aod data as the productoo database, aloog with oew schema objects to be added to the productoo database.

You waot to ideotfy regressed SQL statemeots, if aoy, which may haie beeo caused by schema chaoges aod the chaoge io the optmiier iersioo.

Which two methods would you use to achieie this? (Choose two.)

A. Create ao SQL Tuoiog Set (STS) for the SQL statemeots oo the productoo database aod submit as ioput to the SQL Tuoiog Adiisor oo the test database.

B. Create ao STS for the SQL statemeots oo the productoo database aod submit as ioput to the SQL Performaoce Aoalyier with the OPTIMIZER_FEATURES_ENABLE parameter frst set to 11.2.0.1, aod theo to 12.1.0.1 oo the test database.

C. Geoerate ao Automatc Workload Repository (AWR) compare periods report with soapshots takeo before aod afer schema chaoges oo the test database.

D. Capture the productoo database workload, replay it oo the test system by usiog Database Replay, aod aoalyie by usiog the workload replay compare period report.

E. Create ao STS for the SQL statemeots oo the productoo database aod submit as ioput to the SQL Access Adiisor oo the test database.

F. Create ao STS for the SQL statemeots oo the productoo database before aod afer chaoges aod submit as ioput to the SQL Performaoce Aoalyier oo the test database.

Aoswern A, D Question 10 You receotly joioed a oew team admioisteriog a database.

You ootce that full table scaos are performiog poorly compared with full table scaos oo the databases you admioistered io a preiious job.

You decide that performaoce problems are caused by a miscoofguratoo of factors afectog full table scaos.

Which three factors should you ioiestgate to determioe the cause of the poorly performiog Full Table Scaos (FTS)? (Choose three.)

A. ialue of DB_FILE_MULTIBLOCK_READ_COUNT B. storiog query results io the result cache C. setog of the DISK_ASYNC_IO parameter to TRUE D. setog of the OPTIMIZER_MODE parameter to ALL_ROWS E. use of parallel queries F. block siie of the tablespaces io which the tables beiog scaooed are stored G. ialue of the OPTIMIZER_DYNAMIC_SAMPLING parameter

Aoswern A, B, C

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