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Q: 

Mysql Memory/Heap table data retention/loss/purge

Hi,

I have multiple tables created in MySQL Memory Engine. Except for 3 tables, all other tables will be updated daily (all the records).

We recently noticed that data in one/more of these tables is being deleted after around 14 days (with No data modification statements executed). The data is not completely truncated in a table. Sometimes only a bunch of records are being deleted.

These tables are loaded in with batch load command from a file one time. (there won't be any updates to this table once boot strapped)

The free memory on these machines is plenty (no need for freeing up the data).

Is there any setting/conf that governs this data purging based on the last modified date ?

Thanks & Regards,

-santhu

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