Online Access Free Oracle.1Z0-083.v2022-12-23.q164 Practice Test (Page 14)

1Z0-083 Exam Question 61

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, and then opens the database. SMON then rolls back any dead transactions.

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

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

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

1Z0-083 Exam Question 62

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 63

Choose two. Your SALES_ROOT application container has two application PDBs. The SALES_APP application has a common table, FIN.REVENUE, in the two PDBs. Examine this query and its output: SELECT containers_default, container_map, table_name FROM dba_tables WHERE owner='FIN' ; CONTAINERS_DEFAULT CONTAINER_MAP CONTAINER_MAP_OBJECT TABLE_NAME -------------------------------------------------------------------------------------------------------------------------------NO YES NO REVENUE NO NO YES MAPTABLE Which two are true?

A.The REVENUE table must be a composite-partitioned table.

B.The REVENUE table partitions are not pruned across the PDBs automatically.

C.The CONTAINERS clause cannot be used in queries on the REVENUE table.

D.The REVENUE table must be a list-partitioned table.

E.The MAPTABLE table defines a logical partition key on a commonly used column for the REVENUE table.

1Z0-083 Exam Question 64

You notice that the performance of your production 24/7 Oracle 12c database has significantly degraded. Sometimes you are not able to connect to the instance because it hangs. You do not want to restart the database instance. How can you detect the cause of the degraded performance?

A.Run ADDM in diagnostic mode.

B.Use emergency monitoring to fetch data directly from SGA for analysis.

C.Enable Memory Access Mode, which reads performance data from SGA.

D.Use Active Session History (ASH) data and hang analysis in regular performance monitoring,

E.Run Automatic Database Diagnostic Monitor (ADDM) to fetch information from the latest Automatic Workload Repository (AWR) snapshots.

1Z0-083 Exam Question 65

Which two are true about gathering optimizer statistics? (Choose two.)

A.Executing DBMS_STATS.GATHER_DATABASE_STATSwhile connected to CDB$ROOTgathers object statistics in all open PDBs except PDB$SEED.

B.Executing DBMS_STATS.GATHER_DATABASE_STATSwhile connected to a PDB opened in read/write mode gathers object statistics for that PDB.

C.Executing DBMS_STATS.GATHER_DATABASE_STATSwhile connected to CDB$ROOTgathers object statistics only in CDB$ROOT.

D.System statistics can be gathered only while connected to CDB$ROOT.

E.Executing DBMS_STATS.GATHER_DATABASE_STATSwhile connected to CDB$ROOTgathers object statistics in all open pluggable databases (PDBs)

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1Z0-083 Exam Question 61

1Z0-083 Exam Question 62

1Z0-083 Exam Question 63

1Z0-083 Exam Question 64

1Z0-083 Exam Question 65

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