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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. The optimizer can re optimize a query only once using cardinality feedback.
C. After the optimizer identifies a query as a re-optimization candidate, statistics collected by the collectors are submitted to the optimizer.
D. The optimizer does not monitor cardinality feedback if dynamic sampling and multicolumn statistics are enabled.
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,D,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: 2
Which AWS services provide a way to extend an on-premises architecture lo the AWS Cloud? (Select TWO )
A. AWS Storage Gateway
B. Amazon Connect
C. AWS Direct Connect
D. Amazon CloudFront
E. Amazon EBS
Answer: A,C
NEW QUESTION: 3
A. Option A
B. Option C
C. Option D
D. Option B
Answer: C
NEW QUESTION: 4
A company has decided to update their usage policy to allow employees to surf the web unrestricted from their work computers. Which of the following actions should the IT security team implement to help protect the network from attack as a result of this new policy?
A. Implement MAC filtering on all wireless access points
B. Block port 80 outboundon the company firewall
C. Add an implicit deny to the core router ACL
D. Install host-based anti-malware software
E. Require users to utilize two-factor authentication
Answer: D
Explanation:
Explanation
To protect the computers from employees installing malicious software they download on the internet, antimalware should be run on all systems.
After asingle machine in a company is compromised and is running malicious software (malware), the attacker can then use that single computer to proceed further into the internal network using the compromised host as a pivot point. The malware may have been implemented by an outside attacker or by an inside disgruntled employee.