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NEW QUESTION: 1
The OPTIMIZER_USE_PLAN_BASELINES parameter is set to TRUE. The optimizer generates a plan for a SQL statement but does not find a matching plan in the SQL plan baseline.
Which two operations are performed by the optimizer in this scenario? (Choose two.)
A. The optimizer selects the new plan for the execution of the SQL statement.
B. The optimizer adds the new plan to the SQL plan baseline as an accepted plan.
C. The optimizer costs each of the accepted plans in the SQL plan baseline and picks the one with the lowest cost.
D. The optimizer adds the new plan to the SQL plan baseline but not in the ENABLED state.
E. The optimizer adds the new plan to the plan history.
Answer: C,E
Explanation:
Explanation/Reference:
Explanation:
15.2.2 Selecting SQL Plan Baselines
During the SQL plan baseline selection phase, Oracle Database detects plan changes based on the stored plan history, and selects plans to avoid potential performance regressions for a set of SQL statements.
Each time the database compiles a SQL statement, the optimizer does the following:
1. Uses a cost-based search method to build a best-cost plan
2. Tries to find a matching plan in the SQL plan baseline
3. Does either of the following depending on whether a match is found:
If found, then the optimizer proceeds using the matched plan If not found, then the optimizer evaluates
the cost of each accepted plan in the SQL plan baseline and selects the plan with the lowest cost The best-cost plan found by the optimizer that does not match any plans in the plan history for the SQL statement represents a new plan. The database adds this plan as a nonaccepted plan to the plan history.
The database does not use the new plan until it is verified to not cause a performance regression.
However, if a change in the system (such as a dropped index) causes all accepted plans to become non- reproducible, then the optimizer selects the best-cost plan. Thus, the presence of a SQL plan baseline causes the optimizer to use conservative plan selection strategy for the SQL statement.
To enable the use of SQL plan baselines, set the OPTIMIZER_USE_SQL_PLAN_BASELINES initialization parameter to TRUE (default).
A SQL plan baseline contains one or more accepted plans.
The plan history is the set of plans, both accepted and not accepted, that the optimizer generates for a SQL statement over time, the plans in the baseline form a subset of the plan history. For example, after the optimizer generates the first acceptable plan for a SQL plan baseline, subsequent plans are part of the plan history but not part of the plan baseline.
NEW QUESTION: 2
In the days before CIDR (Classless Internet Domain Routing), networks were commonly organized by classes. Which of the following would have been true of a Class C network?
A. The first bit of the IP address would be set to one and the second bit set to zero.
B. The first bit of the IP address would be set to zero.
C. The first two bits of the IP address would be set to one, and the third bit set to zero.
D. The first three bits of the IP address would be set to one.
Answer: C
Explanation:
Each Class C network address has a 24-bit network prefix, with the three highest
order bits set to 1-1-0
The following answers are incorrect:
The first bit of the IP address would be set to zero. Is incorrect because, this would be a Class A
network address.
The first bit of the IP address would be set to one and the second bit set to zero. Is incorrect
because, this would be a Class B network address .
The first three bits of the IP address would be set to one. Is incorrect because, this is a distractor.
Class D & E have the first three bits set to 1. Class D the 4th bit is 0 and for Class E the 4th bit to
1.Classless Internet Domain Routing (CIDR)
High Order bits are shown in bold below.
For Class A, the addresses are 0.0.0.0 - 127.255.255.255
The lowest Class A address is represented in binary as 00000000.00000000.0000000.00000000
For Class B networks, the addresses are 128.0.0.0 - 191.255.255.255.
The lowest Class B address is represented in binary as 10000000.00000000.00000000.00000000
For Class C, the addresses are 192.0.0.0 - 223.255.255.255
The lowest Class C address is represented in binary as 11000000.00000000.00000000.00000000
For Class D, the addresses are 224.0.0.0 - 239.255.255.255 (Multicast)
The lowest Class D address is represented in binary as 11100000.00000000.00000000.00000000
For Class E, the addresses are 240.0.0.0 - 255.255.255.255 (Reserved for future usage)
The lowest Class E address is represented in binary as 11110000.00000000.00000000.00000000
Classful IP Address Format
References:
3Com http://www.3com.com/other/pdfs/infra/corpinfo/en_US/501302.pdf
AIOv3 Telecommunications and Networking Security (page 438)
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