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MySQL Query Cache does not work with Complex Queries in Transactions

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We did recently a review of one of our customers systems and we found that the Query Cache was disabled even thought it had significant more read than write queries.
When we asked the customer why he has not enabled the Query Cache he mentioned a review that was done a few years ago and which stated that the Query Cache hit ratio was non optimal.
This was verified on a testing system which had the Query Cache enabled by accident.

But we all thought that the Query Cache would make sense in this situation so we investigated a bit more.

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