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Re: truncate partition not happening
Posted by: Mattias Jonsson
Date: January 13, 2012 10:13AM

Rick James Wrote:
-------------------------------------------------------
> Ouch! Could there be other ALTER statements that
> fail to notify the QC?

I have not found any other ALTER statement missing invalidating the QC.

> A side question...
> The QC purges all entries for a "table" upon any
> write -- but in the case of PARTITION, is "table"
> the entire table, or just the one sub-table
> (partition) that was modified?

The QC works on table level only. So any write to the table should invalidate the whole table (all partitions).

Also bug#53775 is known with QC + partitioning. And the best solution would be to change the API for the query cache which would also allow support for 'partition pruning aware' QC.

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