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NEW QUESTION: 1
Which two fields and settings must be verified on the system-parameters customer-options form when adding 16xx or 96xx type telephones? (Choose two.)
A. Maximum Off-PBX Telephones greater than "0"
B. IP Stations field is "y"
C. Digital Stations field is "y"
D. Maximum Media Gateway VAL Sources greater than "0"
E. Maximum Concurrently Registered IP Stations greater than "0"
Answer: E
NEW QUESTION: 2
Examine the parameters for your database instance:
Which three statements are true about the process of automatic optimization by using cardinality
feedback? (Choose three.)
A. The optimizer enables monitoring for cardinality feedback after the first execution of a query.
B. The optimizer does not monitor cardinality feedback if dynamic sampling and multicolumn statistics are
enabled.
C. The optimizer automatically changes a plan during subsequent execution of a SQL statement if there is
a huge difference in optimizer estimates and execution statistics.
D. After the optimizer identifies a query as a re-optimization candidate, statistics collected by the collectors
are submitted to the optimizer.
E. The optimizer can re optimize a query only once using cardinality feedback.
Answer: A,B,C
Explanation:
Explanation/Reference:
Explanation:
C: During the first execution of a SQL statement, an execution plan is generated as usual.
D: if multi-column statistics are not present for the relevant combination of columns, the optimizer can fall
back on cardinality feedback.
(not B)* Cardinality feedback. This feature, enabled by default in 11.2, is intended to improve plans for
repeated executions.
optimizer_dynamic_sampling
optimizer_features_enable
* dynamic sampling or multi-column statistics allow the optimizer to more accurately estimate selectivity of
conjunctive predicates.
Note:
* OPTIMIZER_DYNAMIC_SAMPLING controls the level of dynamic sampling performed by the optimizer.
Range of values. 0 to 10
* Cardinality feedback was introduced in Oracle Database 11gR2. The purpose of this feature is to
automatically improve plans for queries that are executed repeatedly, for which the optimizer does not
estimate cardinalities in the plan properly. The optimizer may misestimate cardinalities for a variety of
reasons, such as missing or inaccurate statistics, or complex predicates. Whatever the reason for the
misestimate, cardinality feedback may be able to help.
NEW QUESTION: 3
Why should the vxfentsthdw utility be used with great care?
A. By default, the utility destroys existing data on the disks.
B. By default, the utility initializes the disks.
C. By default, the utility will stop the High Availability Daemon.
D. By default, the utility will freeze the cluster.
Answer: A
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