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NEW QUESTION: 1
A. Option C
B. Option D
C. Option B
D. Option A
Answer: B
Explanation:
AWS S3 supports client side or server side encryption to encrypt all data at rest. The server side
encryption can either have the S3 supplied AES-256 encryption key or the user can send the key along
with each API call to supply his own encryption key. The encryption with the user supplied key (SSE-C)
does not work with the AWS console. The S3 does not store the keys and the user has to send a key with
each request. The SSE-C works when the user has enabled versioning.
Reference: http://docs.aws.amazon.com/AmazonS3/latest/dev/ServerSideEncryptionCustomerKeys.html
NEW QUESTION: 2
Which two are true about automatic block repair? (Choose two.)
A. Real-Time Query must be enabled on a primary database for automatic block repair to be done on any of its physical standby databases.
B. Real-Time Query must be enabled on a physical standby database for automatic block repair to be done on its primary database.
C. It is not possible for media corrupt blocks.
D. Automatic block repair can repair blocks with no standby database if DB_BLOCK_CHECKING = TRUE.
E. Real-Time Query must be enabled on a physical standby database for automatic block repair to be done on that physical standby database.
Answer: A,E
NEW QUESTION: 3
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 costs each of the accepted plans in the SQL plan baseline and picks the one with the lowest cost.
B. The optimizer adds the new plan to the plan history.
C. The optimizer adds the new plan to the SQL plan baseline as an accepted plan.
D. The optimizer selects the new plan for the execution of the SQL statement.
E. The optimizer adds the new plan to the SQL plan baseline but not in the ENABLED state.
Answer: A,B
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
2
3
. Uses a cost-based search method to build a best-cost plan
. Tries to find a matching plan in the SQL plan baseline
. 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.