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Recovery speed is relative to how often checkpoints are done. Since your checkpoints aren't finishing, it isn't working...it takes around one hour per day of failure of checkpointing to restart. -Is there a way to speedup that process?
-will the changing the format of the database help to solve that problem?
Well, non-Berkeley db backends don't have these sort of checkpoints.
Some internal Berkeley db being held. This might be something to investigate with Sleepycat or at least search their website.-what could cause the checkpoint to fail?
Larry