多項(xiàng)選擇題

You receive complaints from users regarding the high waiting time for their transactions. Oninvestigation， you find that some users are not committing their transactions though they are
notperforming any activity for a long time. As a result， SQL statements need to wait for row-level locks.
Which two actions could you take to prevent this locking problem in the future（）

A.Decrease the IDLE_TIME resource limit in the profile assigned to the blocking users.
B.Use Database Resource Manager to automatically log out sessions that block others and are idle.
C.Set the limit in the profile of blocking users to control the number of blocks to be accessed in a session.
D.Decrease the maximum number of interested transaction list （ITL） slots for the segments on which the blocking user performs the transaction

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多項(xiàng)選擇題

Which two statements describe good practices for an application developer to reduce lockingconflicts in Oracle database（）

A.Avoid coding unnecessary long-running transactions.
B.Allow the database to handle locks in default locking mode.
C.Always explicitly code the locks as per the requirement of the application.
D.Allow escalation of row locks to block locks if too many row locks cause problem.

單項(xiàng)選擇題

User A executes the following command to drop a large table in your database： SQL> DROP TABLE trans；
While the drop table operation is in progress， user B executes the following command on the same table： SQL> DELETE FROM trans WHERE tr_type=’SL’；
Which statement is true regarding the DELETE command（）

A.It fails with a "Resource Busy" error.
B.It deletes the rows successfully because the table is locked in SHARE mode.
C.It fails to delete the records because the table is locked in EXCLUSIVE mode.
D.It deletes the rows successfully because the table is locked in SHARE ROW EXCLUSIVE mode.

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你可能感興趣的試題

Which two statements describe good practices for an application developer to reduce lockingconflicts in Oracle database（）

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