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分类： Oracle
2019-07-30 13:05:30
Which two are true about Optimizer Statistics?
A)They are gathered by the Manageability Monitor(MMON) background process.
B)They can be gathered by executing the PL/SQL procedures in the DBMS_STATES package.
C)They do not persist across instance restarts.
D)They can be used to determine the events on which a database instance waited.
E)They provide information to the Optimizer so that it can determine optimal execution plans for SQL statements.
F)They are automatically updated when DDL statements execute.
Answer: BE
