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Question ID 21715

Which three factors influence the optimizer's choice of an execution plan?

Option A

the optimizer_mode initialization parameter

Option B

operating system (OS) statistics

Option C

cardinality estimates

Option D

object statistics in the data dictionary

Option E

fixed baselines

Correct Answer A,B,D
Explanation Reference: http://docs.oracle.com/cd/B19306_01/server.102/b14211/optimops.htm


Question ID 21716

Examine the resources consumed by a database instance whose current Resource Manager plan is displayed.
SQL> SELECT name, active_sessions, queue_length,
Consumed_cpu_time, cpu_waits, cpu_wait_time
FROM v$rsrc_consumer_group;
NAMEACTIVE_SESSIONS QUEUE_LENGTH CONSUMED_CPU_WAITS
CPU_WAIT_TIME
----------------------------------- -------------------- -------------------- --------------------- ----------------
OLTP__ORDER__ENTRY1029690 467
OTHES__GROUPS 0 059823664089
60425
SYS_GROUP 1 02420704 914
19540
DS.S_QUERIES4245946603004
55700
Which two statements are true?

Option A

An attempt to start a new session by a user belonging to DSS_QUERIES fails with an error.

Option B

An attempt to start a new session by a user belonging to OTHE_GROUPS fails with an error.

Option C

The CPU_WAIT_TIME column indicates the total time that sessions in the consumer group waited for the CPU due to resource management

Option D

The CPU_WAIT_TIME column indicates the total time that sessions in the consumer group waited for the CPU due to I/O waits and latch or enqueue contention.

Option E

A user belonging to the DSS__QUERIES resource consumer group can create a new session but the session will be queued.

Correct Answer C,E
Explanation

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