Thread:Project:Support desk/Uncommitted DB writes (transaction from DatabaseBase::query (MessageBlobStore::clear))/reply

Turn on error reporting: Manual:How_to_debug and look at the error log of apache or PHP, because in some situations it only displays the last error (this one) where the important error message is the first one, which doesn't appear.

You may need to run rebuildLocalisationCache.php --force after changing the language code of the wiki.