Comments - MariaDb Crashing after some wordpress posts
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An additional note: if you upgrade to 5.5.43, please make sure you are not affected by this issue: MDEV-8115 (the known way to be affected is having views over tables with BLOB or TEXT columns). If you do have those, but not too many, the easiest way to work around the problem is the one that people mentioned in the comments to the issue: drop the views, run mysql_upgrade, then re-create the views.