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Oracle 1z1-064問題集

1z1-064

試験コード:1z1-064

試験名称:Oracle Database 12c: Performance Management and Tuning

バージョン:V13.25

最近更新時間:2021-06-24

問題と解答:120 Q&As

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質問 1:
You want to generate statistics for new objects added to an OLTP application without affecting old statistics and the sessions that currently use them.
Which two tasks would you perform to test the new statistics? (Choose two.)
A. Set the OPTIMIZER_USE_PENDING_STATISTICS initialization parameter to TRUE for the session.
B. Set the NO_INVALIDATE statistics preference to FALSE and gather statistics without affecting old statistics.
C. Set the PUBLISH statistics preference to FALSE and then gather statistics.
D. Set the STALE_PERCENT statistics preference to zero and then gather statistics.
E. Use the DBMS_STATS.PUBLISH_PENDING_STATS procedure to make pending statistics the current statistics.
正解:A,D

質問 2:
You want to set a priority for the workloads generated by the applications in your database instance such that report-generating tasks are assigned a lower priority.
How would you do this?
A. by using services for the applications and creating job classes associated with each service
B. by using job classes with the Resource Manager
C. by using services that are assigned different priorities with the Resource Manager
D. by creating an active session pool using the Resource Manager
正解:C

質問 3:
Which two statements are true about gathering statistics? (Choose two.)
A. If an application has only SQL statements with bind variables, it is better to drop existing histograms, disable creation of histograms, and allow the optimizer to select the best execution plans.
B. If concurrent statistics gathering is done by using parallel execution, the Resource Manager should be used for efficient resource management.
C. If end users query newly inserted data, it is possible to get a suboptimal execution plan even if the automatic statistics gathering job is enabled.
D. For each session that is accessing a global temporary table, the optimizer uses only the shared statistics.
正解:B,D

質問 4:
You have been asked to assess if using column store compression (previously known as hybrid columnar compression or HCC) would help improve the performance of queries on some large tables.
Which three aspects should you consider before you choose this compression method? (Choose three.)
A. Check whether the table is frequently queried using full table scans as column store compression only minimizes I/O during full table scans.
B. Check whether the table is frequently updated because it will have overhead for insert and update operations.
C. Check whether the table has LOB columns as it will minimize I/O for the queries.
D. Check whether the table blocks are sparsely populated as this will defragment the blocks.
E. Check whether direct path load operations are used to insert rows in the table.
正解:A,C,E

質問 5:
Which two statements are true about wait events?
A. A single resource wait event may be recorded as multiple waits, depending on the number of session timeouts during that wait.
B. A wait event can be defined in multiple wait classes.
C. Wait events for an instance include statistics for both background and foreground processes.
D. Wait event countries are incremented by the server process that waits.
E. Wait event statistics are cumulatively collected only at the instance level.
正解:B,D

質問 6:
You are administrating a database that supports a mixed workload. Applications are running on a middle tier and use connection pooling to connect to the database instance. You want to trace all applications and modules that use the ORCL1 service to connect to the database instance.
How would you consolidate the SQL statements for sessions that are connected by using the ORCL1 service?
A. by using the DBMS_TRACE package to enable tracing and the tkprof utility to consolidate and interpret trace files
B. by using the DBMS_MONITOR package to enable tracing, the trcsess utility to consolidate trace files, and the tkprof utility to interpret trace files
C. by setting SQL_TRACE = TRUE and using the tkprof utility to consolidate and interpret trace files
D. by using the DBMS_MONITOR package to enable tracing, the tkprof utility to consolidate trace files, and the trcsess utility to interpret trace files
E. by setting TRACE_ENABLED = TRUE and using the tkprof utility to consolidate and interpret trace files
正解:C

質問 7:
A senior DBA asks you to decrease the values of the connect_time_scale and think_time_scale replay processing parameters to 50 to preprocess the workload for replay.
What three could be reasons for this change? (Choose three.)
A. to decrease the number of concurrent users during replay
B. to reduce the time of replay
C. to decrease the wait for a query, caused by noncommitted transactions
D. to increase the number of concurrent users during replay
E. to reduce the elapsed time between two successive user calls from a session.
正解:B,C,D

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