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WAIT_XTP_CKPT_CLOSE

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Description:

This wait type is when a thread is waiting for an In-Memory OLTP checkpoint to complete.

(Books Online description: “Occurs when waiting for a checkpoint to complete.”)

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Added in SQL Server version:

2014

Removed in SQL Server version:

N/A

Extended Events wait_type value:

Maps to the XTP_CKPT_CLOSE map_value in sys.dm_xe_map_values.

The map_key value in sys.dm_xe_map_values is 930 in 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:

This wait type is one that I usually filter out as a benign wait when doing wait statistics analysis.

I have not seen this wait to be a noticeable contention point.

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

  1. Waiting for an In-Memory OLTP checkpoint to complete

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

  1. SOS_Task::PostWait+9e
    EventInternal<SuspendQueueSLock>::Wait+1fb
    HkCheckpointCtxtImpl::WaitForCkptComplete+d0
    HkHostWaitForCkptComplete+13a
    CheckpointWithOptionalTruncate+ed
    DBOpAgent::CheckpointDBHandler+1e
    CStmtCheckpoint::XretExecute+e7
    CMsqlExecContext::ExecuteStmts<1,1>+427
    CMsqlExecContext::FExecute+a43
    CSQLSource::Execute+86c