最新的Oracle Database 19c Performance and Tuning Management - 1Z0-084免費考試真題

A. STATISTICS_LEVEL=ALL and
CONTROL_MANAGEMENT_PACK_ACCESS=DIAGOSTIC+TUNING

B. STATISTICS_LEVEL=BASIC and CONTROL_MANAGEMENT_PACK ACCESS=DIAGOSTIC

C. STATISTICS_LEVEL=TYPICAL and CONTROL_MANAGEMENT_PACK_ACCESS-
DIAGOSTIC*TUNING

D. STATISTICS_LEVEL=TYPICAL and CONTROL_MANAGEMENT_PACK_ACCESS=DIAGOSTIC

A. It can generates the INMEMORY clause that matches the table settings at export time.

B. It always gives preference to the IM column store clause defined at the tablespace level over table-level definitions.

C. Its INMEM0RY_CLAUSE of the Data Pump Export allows modifications to IM column store clause of a table with existing INMEMORY setting.

D. It ignores the IM column store clause of the exporting objects.

E. It must always transports existing INMEMORY attributes.

F. Its TRANSFORM clause can be used to add the INMEMORV clause to exported tables that lack them.

A. Parse Time Elapsed accounts for successful soft and hard parse operations only.

B. When WAIT TIME is high, instance tuning may improve performance.

C. The proportion of WAIT TIME to CPU TIME always increases with increased system load.

D. Systems in which CPU time is dominant need more tuning that those in which WAIT TIME is dominant.

E. Statspack cannot account for high CPU time when CPU TIME is a Top 10 event in DB time. When CPU time is high, SQL tuning may improve performance.

F. DB Time accounts for all time used by background processes and user sessions.

A. Create an index on SALES.CUST_ID to force an INDEX RANGE SCAN on this index followed by a NESTED LOOP join between CUSTOMERS and SALES.

B. Create an index on SALES.TIME_ID to force the return of rows in the order specified by the ORDER BY clause.

C. Collect a new set of statistics on PRODUCT, CUSTOMERS, and SALES because the current stats are inaccurate.

D. Replace the FETCH FIRST clause with ROWNUM to enable the use of an index on SALES.

E. Enable Adaptive Plans so that Oracle can change the Join method as well as the Join order for this query.

A. The buffer cache advisory view v$db_cache_advice provides advice on cache hit ratios appropriate for the instance workload.

B. The performance of workloads that primarily generate full table scans and fast full index scans are always affected by the cache hit ratio.

C. A 99% cache hit ratio can be observed for database instances which have very poor I/O performance.

D. Both the RECYCLE and KEEP buffer caches should always have a very high cache hit ratio.

E. A 60% cache hit ratio can be observed for database instances which have very good I/O performance.

A. The SQL Profiles as well as SQL Plan Baseline are implemented using hints, so they both generate the same plan.

B. The conflict between the two plan stability methods results in an error.

C. The execution plan is the one enforced by the SQL Profile.

D. The execution plan is the one enforced by the SQL Plan Baseline.

E. The existence of two concurrent plan stability methods generates a child cursor for every execution.

F. The SQL Plan Baseline must be accepted in order to be used for the execution plan.