Subject | RE: [firebird-support] Why does Firebird write so much data for simple select queries? |
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Author | Leyne, Sean |
Post date | 2011-10-27T19:25:50Z |
> Two things come immediately to mind:In addition to Doug 2 items, there is one other item:
Garbage Collection -- Due to the MVCC nature of the engine, SELECT queries can find back-versions of records which need to be cleaned up. Depending on the version (Superserver, Classic and SuperClassic) of the engine you are running, you could see a lot disk write activity as the engine cleans up those back-versions.
Sean