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NEW QUESTION: 1
Examine the parameters for your database instance:
NAME TYPE VALUE
----------------------------------------------------------------------------------------------------- optimizer_adaptive_reporting_onlyboolean FALSE optimizer_capture_sql_plan_baselinesboolean FALSE optimizer_dynamic_samplinginteger 2 optimizer_features_enablestring 12.1.0.1 Which three statements are true about the process of automatic optimization by using statistics feedback?
A. The optimizer does not monitor cardinality feedback if dynamic sampling and multicolumn statistics are enabled.
B. The optimizer enables monitoring for cardinality feedback after the first execution of a query.
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
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: 2



A. 192.168.1.1
B. 1.1.1.1
C. 2.2.2.2
D. 172.16.1.1
Answer: C
Explanation:
If a router-id is not configured manually in the OSPF routing process the router will automatically configure a router-id determined from the highest IP address of a logical interface (loopback interface) or the highest IP address of an active interface. If more than one loopback interfaces are configured, the router will compare the IP addresses of each of the interfaces and choose the highest IP address from the loopbacks.

NEW QUESTION: 3
A customer has critical wired endpoints. However, each endpoint has a single Ethernet connection to the network. The customer wants redundancy in the switch access layer to minimize the chances that an endpoint will lose this connection The architect plans to deploy two Aruba CX 6405 switches in the closet.
Which plan provides the greatest redundancy for this scenario?
A. The 6405 Switches are in a VSF fabric, so the individual switches do not need redundant components.
B. The 6405 switches are not in a VSX fabric, and have redundant power supplies and redundant management modules.
C. The 6405 switches are in a VSX fabric, and each has a redundant management module but not a redundant power supply.
D. The 6405 switches are not in a vsF fabric, and have redundant power supplies but not redundant management modules.
Answer: C

NEW QUESTION: 4
You create and share a Microsoft Flow button for the Account entity. The button sends a Microsoft Teams meeting invitation from Dynamics. Which users can view the flow button run history?
A. Each user can only view their run history.
B. Only the user who creates the button can view the run history for all users.
C. People with the appropriate role can see all run history.
D. System administrators may only view the run history.
E. Every user can view all run history.
Answer: A