Your system has been upgraded from Oracle Database 10g to Oracle Database 11g. You
imported SQL Tuning Sets (STS) from the previous version. After changing the
OPTIMIZER_FEATURES_ENABLE parameter to 10.2.0.4 and running the SQL
Performance Analyzer, you observed performance regression for a few SQL statements.
What would you do with these SQL statements?
A.
Set OPTIMIZER_USE_PLAN_BASELINES to FALSE to prevent the use of regressed
plans.
B.
Capture the plans from the previous version using STS and then load them into the stored
outline.
C.
Capture the plans from the previous version using STS and then load them into SQL
Management Base (SMB).
D.
Set OPTIMIZER_CAPTURE_SQL_PLAN_BASELINES to FALSE to prevent the plans
from being loaded to the SQL plan baseline.
Explanation:
The SQL management base (SMB) is a part of the data dictionary that resides in the
SYSAUX tablespace. It stores statement logs, plan histories, SQL plan baselines, and SQL
profiles.
Parameters Relating to Stored Outline Migration:
OPTIMIZER_CAPTURE_SQL_PLAN_BASELINES, Enables or disables the automatic
recognition of repeatable SQL statement and the generation of SQL plan baselines for these
statements.
OPTIMIZER_USE_SQL_PLAN_BASELINES, Enables or disables the use of SQL plan
baselines stored in SQL Management Base.