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The role of Oracle attachment logs

Source: Internet
Author: User
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Why do I have to turn on additional logs when goldengate is in use? People think, if I do update on the source side, how does the target know what row of data I am modifying? So what do we use to identify this line of data that we've modified? ROWID? Obviously not, huh ~ ~
with the primary key Bai ~ ~ But the primary key does not exist in our redo log, then we need to add the primary key as additional information to the Redo log. This way, when analyzing redo log on the target side, you know what's going on! Everyone open supplemental log, and then go to dump REDO log out to see the HA ~ ~

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The role of Oracle attachment logs

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