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NEW QUESTION: 1
How many lines does the following snippet output?
A. one
B. four
C. two
D. three
Answer: D
NEW QUESTION: 2
データベース·インスタンスのパラメータを検査します:
どの3つのステートメントはカーディナリティのフィードバックを使用して、自動最適化のプロセスに関して正しいですか。
A. オプティマイザはカーディナリティのフィードバックを使用して一度だけクエリを再最適化することができます。
B. オプティマイザは問合せの最初の実行後にカーディナリティフィードバックの監視を可能にします。
C. 動的なサンプリングおよび複数列の統計情報が有効になっている場合、オプティマイザはカーディナリティのフィードバックを監視しません。
D. オプティマイザは再最適化候補としてクエリを特定した後、コレクターの間で収集された統計はオプティマイザに提出されます。
E. オプティマイザの推定と実行統計に大きな差がある場合、オプティマイザは自動的にSQLステートメントの後の実行中に計画を変更します。
Answer: B,C,E
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
A. learning
B. discarding
C. backup
D. listening
E. disabled
Answer: A,B
Explanation:
Port States
There are only three port states left in RSTP that correspond to the three possible operational states. The 802.1D disabled, blocking, and listening states are merged into a unique 802.1w discarding state.
NEW QUESTION: 4
Compared with VPLS, what are the characteristics of EVPN?
A. EVPN enables a device to implement load balancing among multiple EVPN routes with the same destination MAC address but different next hops when managing MAC addresses.
B. EVPN needs to be configured to be in full connection state on all PEs on the carrier's backbone network. That is, PWs must be set up between any two PEs.
C. The PE learns the local and remote MAC addresses and their IP addresses through ARP and MAC address advertisement routes, and caches the information locally to prevent ARP request packets from being broadcast to other PEs and reduce network resource consumption.
D. By using the EVPN technology, PB on the carrier's backbone network do not need to establish full connections, which greatly reduces the network complexity and reduces the number of signaling messages.
Answer: A