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This wait type only exists so there is a PAGELATCH_XX wait type for all possible latch modes. Null mode latches are no longer used. 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: “Identified for informational purposes only. Not supported. Future compatibility is not guaranteed.”)

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Added in SQL Server version:


Removed in SQL Server version:


Extended Events wait_type value:

The map_key value in sys.dm_xe_map_values is 48 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 PAGELATCH_EX 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.