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We had a problem with AMD chipset where they would drop into power saving mode, reducing their clock speed by 50%. Worth a look.


3

PostgreSQL doesn't have a result cache. So the only caching that happens is in shared_buffers and the kernel buffer cache - both of which must inhertently be filled in the process of generating the query results, so it must happen before (or while) results are sent. WAL is written as a transaction executes, and WAL archives get replicated as they're ...


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According to the manual, the query cache removes the Least Recently Used (LRU) Query from the Query Cache when the Query Cache is full. Read the general chapter on the MySQL Query Cache for a more detailed description of the logic and architecture of the Query Cache.


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Sounds like your statistics are getting out of date, then eventually SQL's auto update statistics will kick in and update the stats, proper execution plans are being generated, then everything starts running faster again. If you have installed Service Pack 1 for SQL Server 2008 R2 then you can turn on Trace Flag 2371 which will change the algorithm which is ...



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