Some time ago, I faced the problem with our oozie installation running on top of DerbyDB — it becomes too slow and had lots of errors with DB locks. Fast search shows that derby (default oozie backend DB) isn’t good for relatively large systems, so migration to mysql is required. The switch itself is quite straightforward, but if you have existing data in derby, it can be painful to move them into mysql. But, if you know exact steps, the whole process is not hard. Ok, let’s go.
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