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Huge heap vs performance
Posted by: Imre b
Date: October 05, 2007 02:42PM

We deploy an website that logs pager messages.

Every message is stored in a disk based table, only the last 72 hour (also) in a ENGINE=MEMORY. The Heap is always filled with about 15K rows and about 21 Mb in size. This is working pretty well with milions of queries a day.

Now we started to deploy the Mylsam table, that can contain 1,5 Milion rows. The queries are complicated and searches are slowing down.

What would happen if we install 4 GB system memory, increase the maximum heap size variable and try to copy this table to the memory typed engine at boot-time?

Is there a point where memory based tables become ineffective as they get bigger?

Imre

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