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This article mainly shows you "what is the use of real-time apply in oracle", the content is simple and clear, hoping to help you solve your doubts, the following let the editor lead you to study and learn "what is the use of real-time apply in oracle" this article.

When will real-time apply appear?

After consulting the official manual, real-time apply began with oracle10, whether it is oracle 10g1 or oracle 10gr2, I did not further elaborate.

Real-time apply meaning

As long as the rework log generated by the main database is directly written to the standby redo log file of the standby database by the RFS process of the standby library, it will be directly applied to the standby database through the mrp process (that is, the media recovery process).

Real-time apply action

In this way, in the event of a failover or switchover declaration or failure, the switching time between the master and slave is shorter and faster, resulting in a higher degree of data synchronization consistency between the master and slave database. Because the traditional mechanism is that after the main database is redone to the standby database, the standby redo log file is generated first, and then it is archived, and then the archived files are applied through the MRP process of the standby database. In this way, the delay of active and standby data can be imagined.

Real-time apply functional architecture

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