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Oracle online log

Source: Internet
Author: User
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Oracle online logs are generally divided into multiple groups.

Starting from 8i, The dbwr process of Oracle is performed in the background.

The database checkpoint is performed every 3 seconds. The function is to switch online logs to another group, for example, switching from log1 to log2.

The status of log1 changes from current to action or inactive. The status of log2 changes to current,

The data content of the log1 record starts to be transferred to the archive log. After the transfer, the status changes from action to inactive.

If the database power is down when log1 has not become inactive, the online logs at this time need to be generated during recovery.

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