多項選擇題

You perform differential incremental level 1 backups of your database on each working day and level 0 backupon Sundays， to tape. Which two statements are true about differential incremental backups（）

A.The backup performed on Sundays contains all the blocks that have ever been used in the database.
B.The backup performed on Sundays contains all the blocks that have changed since the last level 1 backup.
C.The backup performed on each working day contains all the blocks that have changed since the last level 0 backup.
D.The backup performed on Monday contains all the blocks that have changed since the level 0 backup， and every other working day contains all the blocks that have changed since the level 1 backup

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多項選擇題

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

多項選擇題

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.

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You perform differential incremental level 1 backups of your database on each working day and level 0 backupon Sundays， to tape. Which two statements are true about differential incremental backups（）

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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