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Oracle® Database Reference
12c Release 1 (12.1)

E17615-23
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V$MUTEX_SLEEP_HISTORY

V$MUTEX_SLEEP_HISTORY displays time-series data. Each row in this view is for a specific time, mutex type, location, requesting session and blocking session combination. That is, it shows data related to a specific session (requesting session) that slept while requesting a specific mutex type and location, because it was being held by a specific blocking session. The data in this view is contained within a circular buffer, with the most recent sleeps shown.

Column Datatype Description
MUTEX_IDENTIFIER NUMBER Mutex ID
SLEEP_TIMESTAMP TIMESTAMP(6) The last date/time this MUTEX_TYPE and LOCATION was slept for by the REQUESTING_SESSION, while being held by the BLOCKING_SESSION.
MUTEX_TYPE VARCHAR2(32) Type of action/object the mutex protects
GETS NUMBER The total number of gets since the mutex was created and up until the time of the wait (and from all sessions past and present)
SLEEPS NUMBER The number of times the requester had to sleep before obtaining the mutex
REQUESTING_SESSION NUMBER The SID of a session requesting the mutex
BLOCKING_SESSION NUMBER The SID of a session holding the mutex
LOCATION VARCHAR2(40) The code location where the waiter slept for the mutex
MUTEX_VALUE RAW(4 | 8) If the mutex is held in exclusive (X) mode, this column shows the SID of the blocking session, else it shows the number of sessions referencing the mutex in S mode.
P1 NUMBER Reserved for internal use
P1RAW RAW(4 | 8) Reserved for internal use
P2 NUMBER Reserved for internal use
P3 NUMBER Reserved for internal use
P4 NUMBER Reserved for internal use
P5 VARCHAR2(64) Reserved for internal use
CON_ID NUMBER The ID of the container to which the data pertains. Possible values include:
  • 0: This value is used for rows containing data that pertain to the entire CDB. This value is also used for rows in non-CDBs.

  • 1: This value is used for rows containing data that pertain to only the root

  • n: Where n is the applicable container ID for the rows containing data