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NEW QUESTION: 1
Which two characteristics apply to policy Secure Demonstration and training edition (DTE) virtual appliances?
A. you can't add licenses
B. only for lab
C. only 5 users
D. can you upgrade
Answer: A,B,C,D
NEW QUESTION: 2
どのステートメントは、ルートガードで設定されたポートが上位BPDUを受信したときに何が起こりますかを説明しますか。
A. ポートはerrdisableステート状態になり、トラフィックの転送を停止します。
B. ポートはルート不整合状態になり、トラフィックの転送を停止します。
C. ポートはBPDU-一貫性のない状態になり、トラフィックの転送を停止します。
D. ポートはループ不整合状態になり、トラフィックの転送を停止します。
Answer: B
NEW QUESTION: 3
Examine the parameters for your database instance:
Which three statements are true about the process of automatic optimization by using cardinality feedback?
A. After the optimizer identifies a query as a re-optimization candidate, statistics collected by the collectors are submitted to the optimizer.
B. The optimizer enables monitoring for cardinality feedback after the first execution of a query.
C. The optimizer does not monitor cardinality feedback if dynamic sampling and multicolumn statistics are enabled.
D. 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.
E. The optimizer can re optimize a query only once using cardinality feedback.
Answer: B,C,D
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.