What is Log Cache in Always On?

  • Log Cache:- A new cache which got introduced with Always On functionality and Recovery.
  • The Log Cache is used to cache the log record packages as those get sent from the primary to the secondary.
  • The secondary will keep the received log packages in the Log Cache for a longer time.
  • Even in the case of the secondary lagging a bit behind in recovery, it now is more than likely that the data to recover doesn’t need to be read from disk, but can be read from the Log Cache.

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