What is a sql log pool vs. sql data pool?

I'm creating a visio diagram and need to show sql log pools and sql data pools.
Data pools store data, right?  Like tables of data?
What is an SQL log pool?  What do SQL logs contain?  Don't know anything about them.
brothertruffle880Asked:
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Scott PletcherSenior DBACommented:
SQL Server's log pool is an in-memory cache of the transaction log.  So pretty much like a file buffer.
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Vitor MontalvãoMSSQL Senior EngineerCommented:
As Scott's said, Log Pool is a memory region for cache the logs before flushing it into the transaction log file.  It enhances performance since is faster to access memory than disk.
SQL data pool must be the usual buffer pool, so it stores table data and indexes.
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Microsoft SQL Server 2008

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