Online Access Free Oracle.1Z0-083.v2024-11-04.q291 Practice Test (Page 54)

1Z0-083 Exam Question 261

Which two are true about Oracle Optimizer Statistics, their use, and their collection? (Choose two.)

A.The number of table rows is considered when evaluating the cost of accessing a table using an index.

B.Index balanced B*Tree height is considered when evaluating the cost of using an index.

C.The Statistics Advisor can help recommend the best way to gather statistics.

D.Statistics collected using DBMS_STATS always yield the best optimizer result.

E.The Statistics Advisor generates actions for all recommendations.

1Z0-083 Exam Question 262

Choose three. In which three situations can you use threshold server-generated alerts to help diagnose and fix problems?

A.when free space in a dictionary managed tablespace falls below a specified percentage

B.when the number of logons per second exceeds a specific value

C.when the total number of logons exceeds a specific value

D.when free space in a locally managed tablespace falls below a specified percentage

E.when the total number of locked user account exceeds a specific value

F.when a resumable statement is suspended

1Z0-083 Exam Question 263

While backing up to the Oracle Fast Recovery Area (FRA), you determined the backup istaking too long and suspect a performance bottleneck. Which three are true about diagnosing and tuning these problems? (Choose three.)

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

B.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.

C.If an RMAN BACKUP VALIDATE command takes noticeably lessthan an actual backup, then write I/O is a likely bottleneck.

D.Setting DBWR_IO_SLAVES to a non zero value can improve backup performance when using asynchronous I/O/

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

F.Setting DBWR_IO_SLAVES to a non zero value can improve backup performance when using synchronous I/O.

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

1Z0-083 Exam Question 264

choose two Examine these RMAN commands: RMAN> CONNECT TARGET "sbu@prod AS SYSBACKUP"; RMAN> CONNECT AUXILIARY "sbu@dup_db AS SYSBACKUP"; RMAN> DUPLICATE TARGET DATABASE TO dup_db FROM ACTIVE DATABASE PASSWORD FILE SECTION SIZE 400M; Which two statements are true about the DUPLICATE command?

A.Itsucceeds only if the target database is greater than 400M.

B.No catalogued backup of the TARGET is used to duplicate the database.

C.It fails because no parallel channels are allocated for the auxiliary database.

D.It succeeds.

E.It fails because connection to the AUXILIARY instance must be as SYSDBA.

1Z0-083 Exam Question 265

Choose two. Which two are true about monitoring waits for sessions and services?

A.V$SESSION_EVENT displays all waits events for those events that have occurred at least once for sessions that have now terminated.

B.V$SESSION_WAIT and V$SESSION both contain details of the event on which a non-waiting session last waited.

C.V$SESSION_WAIT and V$SESSION both contain details of the event on which a waiting session is currently waiting.

D.V$SERVICE_EVENT displays wait counts for every wait event for each service even including counts of zero for waits that never occurred.

E.V$SESSION_WAIT_CLASS displays waits broken down by wait class only for terminated sessions.

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