READ Free Dumps For Oracle- 1z0-062

Question ID 21737	Which two statements are true concerning dropping a pluggable database (PDB)?
Option A	The PDB must be open in read-only mode.
Option B	The PDB must be in mount state.
Option C	The PDB must be unplugged.
Option D	The PDB data files are always removed from disk.
Option E	A dropped PDB can never be plugged back into a multitenant container database (CDB).
Correct Answer	B,C

Explanation Explanation: http://docs.oracle.com/database/121/ADMIN/cdb_plug.htm#ADMIN13658

Question ID 21738	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.
Option A	Missing or stale histogram statistics
Option B	Undersized shared pool
Option C	High clustering factor for the indexes
Option D	High value for the DB_FILE_MULTIBLOCK_READ_COUNT parameter
Option E	Oversized buffer cache
Correct Answer	A,C,D

Explanation Explanation: D: DB_FILE_MULTIBLOCK_READ_COUNT is one of the parameters you can use to minimize I/O during table scans. It specifies the maximum number of blocks read in one I/O operation during a sequential scan. The total number of I/Os needed to perform a full table scan depends on such factors as the size of the table, the multiblock read count, and whether parallel execution is being utilized for the operation.

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