Have you tried addressing this on the mysql server side?

On the server side you can set TMPDIR env var; or start the DB with --tmpdir; or set in your server options file.

[mysqld]
tmpdir=C:/temp

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In reply to Re: DBD::mysql::st execute failed (Errcode: 28) by wazat
in thread DBD::mysql::st execute failed (Errcode: 28) by kingquattro

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