单项选择题

When does Oracle9i flag an index as being used in the V$OBJECT_USAGE view？（）

A.During a query’s parse time only.
B.During a query’s execution time only.
C.During any kind of DML statement execution.
D.During the execution of an INSERT statement only.

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多项选择题Whichtwoaretrueregardingexternaltables？（）

A.External tables can be updated.
B.External tables are read-only tables.
C.Indexes can be created on external tables.
D.Indexes cannot be created on external tables.

单项选择题Consider the following statement： SQL> EXECUTE DBMS_STATS.GATHER_SHEMA_STATS （- 2> ownname => ‘OE’， - 3> estimate_percent => DBMS_STATS.AUTO_SAMPLE_SIZE， - 4> method opt => ‘for all columns size AUTO’）； What is the effect of ‘for all columns size AUTO’ of the METHOD_OPT option？（）

A.The Oracle server creates a new histogram based on existing histogram definitions for all table, column, and index statistics for the OE schema.
B.The Oracle server creates a histogram based on data distribution regardless of how the application uses the column/s for all table, column, and index statistics for the OE schema.
C.The Oracle server creates a histogram based on data and application usage of the column/s for all table, column, and index statistics for the OE schema.
D.The Oracle server creates a histogram based on application usage, regardless of data distribution, for all table, column, and index statistics for the OE schema.