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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 does not monitor cardinality feedback if dynamic sampling and multicolumn statistics are enabled.
C. The optimizer can re optimize a query only once using cardinality feedback.
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 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,B,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
Refer to the Exhibit.
An administrator has configured a firewall rule as shown in the Exhibit.
Which statement best describes the ESXi 6.x firewall rule?
A. TCP Connections coming from IP addresses from the 192.168.1.0 network and 192.168.2.220 on port
22 are not allowed.
B. TCP Connections from the ESXi host to all devices on the 192.168.1.0 network and 192.168.2.220 on port 22 are not allowed.
C. Connections coming from IP addresses from the 192.168.1.0 network and 192.168.2.220 on port 22 are allowed.
D. Connections from the ESXi host to all devices on the 192.168.1.0 network and 192.168.2.220 on port
22 are allowed.
Answer: C
Explanation:
Explanation/Reference:
Explanation:
PoRT 22 SSH on ESXi allowed :
"Allow connections from any IP address," or, you can select "Only allow connections from the following networks" and enter an IP address or subnet. You can enter multiple IP addresses and subnets, separated with a comma.
By default, there is a set of predefined firewall rules that can be enabled/disabled for the ESXi host from the vSphere Client.
These firewall services can be enabled/disabled for the defined ports (UDP/TCP) from the vSphere Client.
However, if you need to enable the service on a protocol that is not defined, you must create new firewall rules from the command line.
For example, the DNS Client service can be enabled/disabled only on UDP port 53.
To enable DNS for TCP:
Open an SSH connection to the host. For more information, see Using ESXi Shell in ESXi 5.0 and 6.0 (2004746).
List the firewall rules by running the command:
# esxcli network firewall ruleset list
https://kb.vmware.com/selfservice/microsites/search.do?
language=en_US&cmd=displayKC&externalId=2008226
NEW QUESTION: 3
A network administrator wants to deploy a wireless network in a location that has too much RF interference at 2.4
GHz. Which of the following standards requires the use of 5 GHz band wireless transmissions? (Select TWO)
A. 802.11g
B. 802.11b
C. 802.11n
D. 802.11a
E. 802.11ac
Answer: D,E