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Specify MySQL storage engine for mfdb temp tables.
Since MySQL 5.5 changes the default storage engine to InnoDB, and since many distros configure the InnoDB file path to refer to a directory on a file system with barriers enabled, any temporary tables written to disk will be written as InnoDB tables on the InnoDB file path, rather than using MyISAM tables, which can be stored on the tmpdir. This results in severe performance issues when using mythfilldatabase with Schedules Direct data. Therefore, specify the use of MyISAM storage engine for mythfilldatabase DataDirect temporary tables. See, also: https://bugs.launchpad.net/ubuntu/+source/mythtv/+bug/997367
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