TestsChamp

Oracle

1Z0-064

Exam Name:

Oracle Database 12c: Performance Management and Tuning

Product: Demo

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Version: 9.0

Questoo: 1

Your database supports a mixed torkload. The ERP applicaton creates short sessions and performssmalle random I/Os; the REPORTING applicaton executes long-running DSS queries.You tant to set a priority for the torkload generated by the ERP applicaton and optmiie resourceusage for them.Which three objectves can be achieved by the Resource Manager? (Choose three.)

A. limitng the amount of tme that a session is idle and blocking other sessions of the ERPapplicatonB. limitng the amount of undo generated by operatons performed by sessions created by the ERPapplicatonC. creatng tto resource plans tith resource limits defned for the torkload generated by theapplicatons and automatcally changing resource plans based on the torkloadD. allocatng a loter percentage of CPU to sessions used by the REPORTING applicaton than to thoseused by the ERP applicatonE. limitng the physical I/O performed by the sessions or users of the ERP applicaton that areconnected to the database

Aoswer: B, D, E

Questoo: 2

Examine the partal TKPROF output for an SQL statement:

Which tto inferences can defnitely be made from this output? (Choose tto.)

A. Array fetch operatons tere not performed for this query.B. No hard parse tas performed for this query.C. The number of logical I/Os is almost equal to the number of physical I/Os.D. Another transacton held a shared lock on the tablee thereby causing a signifcant delay.

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Aoswer: B, D

Questoo: 3

In your databasee the measured 99th percentle value is used as the maximum value. You set atarning threshold level of 110% of maximum trigger as an alert.What is the outcome? (Choose the best anster.)

A. It generates an error because the tarning threshold cannot exceed 100%.B. It generates an error because the percentage of maximum threshold cannot be set tith asignifcance-level threshold value.C. It generates an alert then an observed metric is 99% of the 99th percentle value as measuredover the moving tindot baseline.D. It generates an alert then an observed metric is 110% of the 99th percentle value as measuredover the moving tindot baseline.E. It generates an alert then 1 in 100 observatons for an observed metric exceeds the 99thpercentle value as measured over the fxed baseline.

Aoswer: A

Questoo: 4

You tant to capture AWR data to monitor performance variaton every Monday betteen 9:00 AMand 12:00 PM for three months and automatcally remove the older AWR data every fortnight.Hot tould you achieve this? (Choose the best anster.)

A. Create AWR baselines.B. Create SQL plan baselines.C. Create repeatng baseline templates.D. Create database services and make sure that user connectons use them to connect to thedatabase instance.E. Create a single baseline template.

Aoswer: D

Questoo: 5

Which tto actons can reduce library cache latch contenton for an OLTP applicaton that repeatedlyexecutes queries containing a mix of literals and bind variables? (Choose tto.)

A. setng the OPEN_CURSORS parameter to hold a sufcient number of concurrently open cursorsB. coding the applicaton such that a frequently executed statement is parsed only once and executedrepeatedly as requiredC. setng the CURSOR_SHARING parameter to EXACTD. avoiding the grantng of privileges on objects associated tith cursors during peak loadE. enabling Automatc Memory Management and allocatng at least 50% of the available memory forSHARED_POOL_SIZEF. confguring shared server connectons

Aoswer: B, E

Reference: htp://docs.oracle.com/cd/B22859_01/server.111/b22227/memory.htm

Questoo: 6

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You are administering a database that supports multple applicatonse thich make dedicatedconnectons to the database instance by using diferent services.You execute the command to enable tracing of the ORCL1 service:

Which tto statements are true? (Choose tto.)

A. A single trace fle is generated for all sessions mapped to the ORCL1 service.B. SQL trace is enabled for all modules and actons for sessions mapped to the ORCL1 service.C. An SQL trace fle is generated for each session that maps to the ORCL1 service.D. An SQL trace fle is generated for each of the modules using the ORCL1 service.E. SQL trace is not enabled for the service because a module name is not specifed.

Aoswer: A, C

Questoo: 7

In thich three situatons can dynamic statstcs be used? (Choose three.)

A. then the sampling tme is a small fracton of the total tme for a queryB. then an executon plan is suboptmal because of complex predicatesC. then extended statstcs are not available for SQL statements that use complex predicatesD. then a query is on a parttoned table tith a global indexE. then index statstcs are missing on a column that is used in SQL statements tith highly selectveflters

Aoswer: ABC

Reference:htps://docs.oracle.com/database/121/TGSQL/tgsql_statscon.htmmTGSQL871

Questoo: 8

You tant to generate statstcs for net objects added to an OLTP applicaton tithout afectng oldstatstcs and the sessions that currently use them.Which tto tasks tould you perform to test the net statstcs? (Choose tto.)

A. Set the OPTIMIZER_USE_PENDING_STATISTICS initaliiaton parameter to TRUE for the session.B. Set the STALE_PERCENT statstcs preference to iero and then gather statstcs.C. Set the PUBLISH statstcs preference to FALSE and then gather statstcs.D. Use the DBMS_STATS.PUBLISH_PENDING_STATS procedure to make pending statstcs the currentstatstcs.E. Set the NO_INVALIDATE statstcs preference to FALSE and gather statstcs tithout afectng oldstatstcs.

Aoswer: A, B

Questoo: 9

You plan to upgrade your producton database from Oracle Database 11g to 12c. As part of theupgradee you tant to introduce net indexes and materialiied viets. You have already created a testsystem tith Oracle Database 12ce having the same structure and data as the producton databaseealong tith net schema objects to be added to the producton database.

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You tant to identfy regressed SQL statementse if anye thich may have been caused by schemachanges and the change in the optmiier version.Which tto methods tould you use to achieve this? (Choose tto.)

A. Create an SQL Tuning Set (STS) for the SQL statements on the producton database and submit asinput to the SQL Tuning Advisor on the test database.B. Create an STS for the SQL statements on the producton database and submit as input to the SQLPerformance Analyier tith the OPTIMIZER_FEATURES_ENABLE parameter frst set to 11.2.0.1e andthen to 12.1.0.1 on the test database.C. Generate an Automatc Workload Repository (AWR) compare periods report tith snapshots takenbefore and afer schema changes on the test database.D. Capture the producton database torkloade replay it on the test system by using Database Replayeand analyie by using the torkload replay compare period report.E. Create an STS for the SQL statements on the producton database and submit as input to the SQLAccess Advisor on the test database.F. Create an STS for the SQL statements on the producton database before and afer changes andsubmit as input to the SQL Performance Analyier on the test database.

Aoswer: A, D

Questoo: 10

You recently joined a net team administering a database.You notce that full table scans are performing poorly compared tith full table scans on thedatabases you administered in a previous job.You decide that performance problems are caused by a misconfguraton of factors afectng full tablescans.Which three factors should you investgate to determine the cause of the poorly performing FullTable Scans (FTS)? (Choose three.)

A. value of DB_FILE_MULTIBLOCK_READ_COUNTB. storing query results in the result cacheC. setng of the DISK_ASYNC_IO parameter to TRUED. setng of the OPTIMIZER_MODE parameter to ALL_ROWSE. use of parallel queriesF. block siie of the tablespaces in thich the tables being scanned are storedG. value of the OPTIMIZER_DYNAMIC_SAMPLING parameter

Aoswer: A, B, C

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