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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 can re optimize a query only once using cardinality feedback.
B. 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.
C. The optimizer enables monitoring for cardinality feedback after the first execution of a query.
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 does not monitor cardinality feedback if dynamic sampling and multicolumn statistics are enabled.
Answer: B,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
Während der Ausführung eines Projekts stellt der Projektmanager fest, dass es für jedes Teammitglied einige anfängliche Anforderungen gibt, die nicht im Geltungsbereich berücksichtigt wurden. Was sollte der Projektmanager tun?
A. Implementieren Sie Korrekturmaßnahmen, die vom Change Control Board (CCB) genehmigt wurden.
B. Sprechen Sie mit der Personalabteilung, um neue Teammitglieder zu rekrutieren
C. Treffen Sie sich mit dem Projektsponsor, um festzustellen, warum diese Voraussetzungen nicht enthalten waren
D. Erstellen Sie eine neue Basislinie und aktualisieren Sie den Projektmanagementplan
Answer: A
NEW QUESTION: 3
A network technician at a company, Joe is working on a network device. He creates a rule to prevent users from connecting to a toy website during the holiday shopping season. This website is blacklisted and is known to have SQL injections and malware. Which of the following has been implemented?
A. Network separation
B. Implicit Deny
C. Firewall rules
D. Mandatory access
Answer: B
NEW QUESTION: 4
Ryan, an insurance salesperson, sells an insurance policy covering hurricane damage to Sean. However, as instructed by his company, Ryan fails to tell Sean that the policy does not include water damage caused by hurricane flooding. In this scenario,
A. only Ryan can be held accountable for fraudulent sale.
B. Ryan can be held accountable only if water damage actually happens.
C. no one can be held accountable as the buyer must read the document carefully before buying.
D. only the insurance company can be held accountable for fraudulent sales.
E. both the insurance company and the salesman can be held accountable.
Answer: E