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Re: MySQL optimization for testing purpose
Posted by: Sebastien FLAESCH
Date: April 10, 2018 08:24AM

Tested with:

tmp_table_size = 512M
max_heap_table_size = 512M

But this did not help...

Note that I get similar symptoms with different versions of MySQL 8.0, 5.7 ( and MariaDB 10.3! ) ...

So I believe there is quite a serious problem in the server code. You might want to try to reproduce on your side with pure SQL, with a script that repeats CREATE TABLE, INSERT 1 row, SELECT the row, DROP TABLE. If you cannot repro, change the column type in CREATE TABLE statements, to cover all possible MySQL types...

Just a thought: Is it possible that the server detects that a process is going crazy by creating and dropping the same table many times, and decides to allocate less SQL processing by design? Or prevent attacks or so?

Seb

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