SLEEP_BPOOL_FLUSH

Arun Sirpal investigates a slow backup with an interesting wait stat:

You get this wait type when the checkpoint process realizes that it’s saturating the I/O subsystem. (https://www.sqlskills.com/help/waits/sleep_bpool_flush/), so it seemed that my backup could not even issue a checkpoint successfully. With that thinking I decided to do a manual checkpoint which just made the problem worse.

Read on for more details.

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