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NEW QUESTION: 1

A. Option C
B. Option B
C. Option D
D. Option A
Answer: D

NEW QUESTION: 2
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. 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 enables monitoring for cardinality feedback after the first execution of a query.
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: C,D,E
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: 3

A. Option B
B. Option D
C. Option C
D. Option E
E. Option A
Answer: A,C
Explanation:
Follow these guidelines when configuring port security:
+
Port security can only be configured on static access ports, trunk ports, or 802.1Q tunnel ports. -> A is not correct.
+
A secure port cannot be a dynamic access port.
+
A secure port cannot be a destination port for Switched Port Analyzer (SPAN).
+
A secure port cannot belong to a Fast EtherChannel or Gigabit EtherChannel port group. -> E is not correct
+
You cannot configure static secure or sticky secure MAC addresses on a voice VLAN. -> D is not correct.
+
When you enable port security on an interface that is also configured with a voice VLAN, you must set the maximum allowed secure addresses on the port to at least two.
+
If any type of port security is enabled on the access VLAN, dynamic port security is
automatically enabled on the voice VLAN.
+
When a voice VLAN is configured on a secure port that is also configured as a sticky secure port, all addresses seen on the voice VLAN are learned as dynamic secure addresses, and all addresses seen on the access VLAN (to which the port belongs) are learned as sticky secure addresses.
+
The switch does not support port security aging of sticky secure MAC addresses.
+
The protect and restrict options cannot be simultaneously enabled on an interface.

NEW QUESTION: 4
You have an aggregate with 10 TB free. You create a 1 TB volume with space-guarantee set to none. In that volume, you create a 500 GB LUN with space-reserve enabled.
How much space is available in the aggregate before data is written to the LUN?
A. 9.5 TB
B. 9 TB
C. 10 TB
D. 8.5 TB
Answer: A