單項(xiàng)選擇題

The job to gather optimizer statistics for objects runs as part of the automatic maintenance window in yourdatabase instance. At a certain point of time， the maintenance window closes before the statistics are gatheredfor all objects.
Which statement is true in this scenario（）

A.The statistics collection continues until all objects are processed.
B.The job is terminated and the statistics collected are restored to a time before the job started.
C.This produces an error and the statistics collected are locked until the next time that the maintenancewindow is opened.
D.The job is terminated and the statistics for the remaining objects are collected the next time that themaintenance window is opened

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多項(xiàng)選擇題

Which two statements are true regarding B-tree indexs（）

A.The leaf blocks in the index are doubly linked.
B.The leaf node stores a bitmap for each key value.
C.The rows with NULL value in key columns also have entries in the index.
D.The deletion of a row from the table causes a logical deletion in index leaf block and the space becomesavailable for the new leaf entry

單項(xiàng)選擇題

Given below is a list of scenarios：
1） A user terminates his session abnormally.
2） The connection between the server and the client application terminates because of a network failure.
3） A schema is accidentally dropped.
4） The tablespace is accidentally dropped from the database.
5） The hard disk gets corrupted and the data files in the disk are lost.
6） The database instance abnormally shuts down because of power failure.
Which scenarios require DBAintervention to perform recovery（）

A.1， 3， and 6
B.4， 5， and 6
C.3， 4， and 5
D.1， 2， and 6

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The job to gather optimizer statistics for objects runs as part of the automatic maintenance window in yourdatabase instance. At a certain point of time， the maintenance window closes before the statistics are gatheredfor all objects. Which statement is true in this scenario（）

你可能感興趣的試題

Which two statements are true regarding B-tree indexs（）

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The job to gather optimizer statistics for objects runs as part of the automatic maintenance window in yourdatabase instance. At a certain point of time， the maintenance window closes before the statistics are gatheredfor all objects.
Which statement is true in this scenario（）