8.84 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