单项选择题
An index-organized table （IOT） called SPARSE has had many records deleted. Which command reorganizes the IOT so that the empty space is removed， while minimizing the impact for users？（）
A.EXPORT with TABLES and IMPORT with the INDEX and IGNORE options.
B.ALTER TABLE … COALESCE ；
C.ALTER INDEX …REBUILD ONLINE；
D.CREATE TABLE …AS SELECT_ONLINE；
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多项选择题
The CURSOR_SHARING parameter is set to SIMILAR at the instance level and you issue these SELECT statements in the order shown below： SELECT * FROM employees WHERE department_id=50； SELECT * FROM employees WHERE department_id=70； There is an index on the DEPARTMENT ID column of the 1，000，000 row EMPLOYEES table. Ninety percent of the employees are part of the DEPARTMENT_ID 50. In which two scenarios will Oracle9i share the corresponding cursors for the two statements？（）
A.A
B.B
C.C
D.D -
单项选择题
ThedirecthandoffconnectionmethodtoanOracle9iSharedServerinvolvesfewermessagesthaninpreviousreleasesofthemultithreadedarchitecture.Whichtypeofmessagehasbeeneliminated？（）
A.The initial request from the client to the listener.
B.Messages between the dispatcher and the shared server background processes.
C.A redirect message from the listener to the client during client connections.
D.Round-trip messages between the listener and the shared server background processes. -
多项选择题
WhichthreeresourceplanparametersareusedtoenableAutomaticConsumerGroupSwitchingtoestimatejobexecutiontimesautomatically，andtoperformaswitchtoalowpriorityconsumergroupbeforetheyareinitiated？（）
A.SWITCH_TIME
B.SWITCH_GROUP
C.MAX_SESS_POOL
D.SWITCH_ESTIMATE
