ChannelDB2

Lets say, If DB2 tries to read a modified page/extent from the bufferpool and if it needs the pre-image of that page/extent , since it was not committed where does the DB2 go to read it? Will it go to Active logs to read the same? Or does it maintain two different lists in the bufferpool to maintain a dirty page/extent?

 

I know in Oracle it goes to Rollback Segments/Undo.

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