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Speed of reading decreases in time
Posted by: Andrey Shchurkov
Date: May 23, 2011 04:58AM

I have a procedure that simulates some objects and for each simulated object it does a lot of reading from two memory tables with 40-50 mln records in each.

Number of reads from that tables for each simulated object is about 50.

The issue is that when I start simulating some number of objects, simulation speed of first object is about 0.25 sec/object. But the speed decreases in time - after simulated 2,000 objects the speed is about 10 sec/object, after 5,000 objects - 70 sec/object.

And the slowest queries are reads from these two memory tables.

Memory limits should be okay:
max_heap_table_size = 20G
tmp_table_size = 2G

P.S. I do only reads - no inserts or updates.

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