多項選擇題

You notice a high number of waits for the db file scattered read and db file sequential read events in the recent Automatic Database Diagnostic Monitor (ADDM) report. After further investigation, you find that queries are performing too many full table scans and indexes are not being used even though the filter columns are indexed.
Identify three possible reasons for this.（）

A. Missing or stale histogram statistics
B. Undersized shared pool
C. High clustering factor for the indexes
D. High value for the DB_FILE_MULTIBLOCK_READ_COUNT parameter
E. Oversized buffer cache

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單項選擇題

Which statement is true concerning dropping a pluggable database (PDB)?（）

A. The PDB must be open in read-only mode.
B. The PDB must be in mount state.
C. The PDB must be unplugged.
D. The PDB data files are always removed from disk.
E. A dropped PDB can never be plugged back into a multitenant container database (CDB).

多項選擇題

You upgrade your Oracle database in a multiprocessor environment. As a recommended you execute thefollowing script:SQL > @utlrp.sqlWhich two actions does the script perform?（）

A. Parallel compilation of only the stored PL/SQL code
B. Sequential recompilation of only the stored PL/SQL code
C. Parallel recompilation of any stored PL/SQL code
D. Sequential recompilation of any stored PL/SQL code
E. Parallel recompilation of Java code
F. Sequential recompilation of Java code

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你可能感興趣的試題

Which statement is true concerning dropping a pluggable database (PDB)?（）

You upgrade your Oracle database in a multiprocessor environment. As a recommended you execute thefollowing script:SQL > @utlrp.sqlWhich two actions does the script perform?（）

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