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PAGEIOLATCH_KP

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Description:

This wait type only exists so there is a PAGEIOLATCH_XX wait type for all possible latch modes. The Latches Whitepaper in the sidebar on the right has a description of all latch modes and their compatibility with other latch modes.

(Books Online description: “Occurs when a task is waiting on a latch for a buffer that is in an I/O request. The latch request is in Keep mode. Long waits may indicate problems with the disk subsystem.”)

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Added in SQL Server version:

Pre-2005/2005

Removed in SQL Server version:

N/A

Extended Events wait_type value:

The map_key value in sys.dm_xe_map_values is 65 in all versions through 2014 RTM. After 2014 RTM, you must check the DMV to get the latest value as some map_key values have changed in later builds.

Other information:

See the PAGEIOLATCH_SH wait type for more details.

Known occurrences in SQL Server (list number matches call stack list):

No known occurrences.

Abbreviated call stacks (list number matches known occurrences list):

No known occurrences.