Transaction Log full on Mirror

  • I've got canned alerts set up on both my Principal and Mirror servers to monitor matters. One of these alerts is to send out an e-mail should the transaction log file size exceed 90% of capacity. No issues with this until last night. I had to make some configuration changes on the mirror machine which necessitated a reboot. So, I paused mirroring, cycled the machine, made sure SQL Server was back up and running and then re-started mirroring. All appears to be hunky-dory except for the fact that I am now getting spammed with alerts that the transaction log on the mirror is 100% full.

    There are no space issues on the t-log drive.

    Snapshot of the mirror DB looks normal and up to date.

    I'm running a checkdb to see if that shows anything. Since the DB is 2.4TB in size, though, even a PHYSICAL_ONLY takes a while.

    Anyone have any clues?

  • To update:

    DBCC CHECKDB with PHYSICAL_ONLY returned no errors.

    AN idle thought is that there is simply a mis-reading somewhere as this is a mirror DB, but I've had the mirror and the alert up and active for quite some time with no issues / errors.

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