BDB checkpointing overhead

Hello.

If I use the checkpointing feature in the bdb backend, if there were no changes made to the directory since the previous checkpoint, is there any overhead other than waking up the code to check to see if the database is to be synced?

If there are no unsynced changes, does anything get written to disk or logged in any way when the checkpointing code wakes up?

Thank you.

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