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NEW QUESTION: 1
Examine the parameters for your database instance:
NAMETYPEVALUE
- -----------------------------------------------
optimizer_adaptive_reporting_onlybooleanFALSE
optimizer_capture_sql_plan_baselinesbooleanFALSE
optimizer_dynamic_samplinginteger2
optimizer_features_enablestring12.1.0.1
Which three statements are true about the process of automatic optimization by using statistics feedback?
A. The optimizer enables monitoring for cardinality feedback after the first execution of a query.
B. After the optimizer identifies a query as a re-optimization candidate, statistics collected by the collectors are submitted to the optimizer.
C. The optimizer does not monitor cardinality feedback if dynamic sampling and multicolumn statistics are enabled.
D. The optimizer can re optimize a query only once using cardinality feedback.
E. 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.
Answer: A,C,E
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: 2
You are meeting with a new customer. One of the first steps you need to take is to figure out how the customer will measure the success solution.
Why is this important?
A. You need to look beyond the customer's needs and help affect change in the infrastructure.
B. You need to be able to describe benefits of your solution in metrics relevant to the customer.
C. You need to be able to size the solution appropriately.
D. You need to understand the limitations of the client.
Answer: B
NEW QUESTION: 3
Welche der folgenden Faktoren beeinflusst der Projektmanager in Bezug auf den Einflussbereich eines Projektmanagers in einem Projekt am unmittelbarsten?
A. Lieferanten
B. Kunden
C. Projektteam
D. Leitungsgremien
Answer: C
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