Free Access Oracle.1Z0-083.v2022-07-24.q137 Practice Test (Page 20)

Question 91

Which two are true about Oracle instance recovery? (Choose three.)

A.Recovery begins from the last checkpoint position that was recorded in the control file by the checkpoint process (CKPT).

B.Recovery reads redo until the end of the redo thread. SMON rolls back any dead transactions, and then the datanase is opened.

C.Recovery begins from the last checkpoint position that was calculated by the Database Writer before instance failure.

D.Recovery begins from the start of any ACTIVE redo log group or the start of the CURRENT log group if no other group is ACTIVE.

E.Recovery reads redo until the end of the redo thread, and then opens the database. SMON then rolls back any dead transactions.

F.Recovery begins from the beginning of the CURRENT redo log group.

Question 92

Which two are true about the Oracle dataabsemethodology? (Choose two.)

A.The Oracle Database time model should be used to find the database and instance areas most in need of tuning.

B.The alert log should be used to find the database and instance areas most in need of tuning.

C.The database instance memory should always be tuned before tuning any file systems.

D.SQL statements should always be tuned before tuning any file systems.

E.Tuning activities should stop once the user is satisfied with performance.

F.Tuning activities should stop onceagreed service levels for performance have been met.

Question 93

While backing up to an SBT channel, you determine that the read phase of your compressed Recovery Manager (RMAN) incremental level 0 backup is a bottleneck.
FORCE LOGGING is enabled for the database.
Which two could improve read performance? (Choose two.)

A.Increase the level of RMAN multiplexing.

B.Increase the size of tape I/O buffers.

C.Enable asynchronous disk I/O.

D.Disable FORCE LOGGING for the database.

E.Increase the size of the database buffer cache.

Question 94

Choose two. When backing up to the Oracle Fast Recovery Area (FRA), you determine that the backup takes too long and suspect a performance bottleneck. Which two are true about diagnosing and tuning these problems?

A.If an RMAN BACKUP VALIDATE command takes noticeably less time than an actual backup, then write I/O is a likely bottleneck.

B.Data files with a high value in V$BACKUP_ASYNC_IO.SHORT_WAITS are a potential performance bottleneck when asynchronous I/O is used.

C.Data files with a high value in V$BACKUP_SYNC_IO.DISCRETE_BYTES_PER_SECOND are a potential performance bottleneck when synchronous I/O is used.

D.If an RMAN BACKUP VALIDATE command takesroughly the same time as an actual backup, then read I/O is a likely bottleneck.F

E.If an RMAN BACKUP VALIDATE command takesroughly the same time as an actual backup, then both read and write I/O are likely bottlenecks.

Question 95

Your SALES_ROOTapplication container has two application PDBs.
The SALES_APPapplication has a common table, FIN.REVENUE, in the two PDBs.
Examine this query and its output:

Which two are true? (Choose two.)

A.A container map exists for the REVENUEtable, but is not enabled.

B.The REVENUEtable must be a list-partitioned table.

C.The MAPTABLEtables defines a logical partition key on a commonly used column for the REVENUEtable.

D.The MAPTABLE table is a metadata-linked table.

E.The REVENUEtable partitions are not pruned across the PDBs automatically.

F.The CONTAINERSclause cannot be used in queries on the REVENUEtable.

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