9.18 V$SESSION_BLOCKERS

V$SESSION_BLOCKERS displays the blocker sessions for each blocked session. Each row represents a blocked and blocker session pair. If a session is blocked by multiple sessions there will be multiple rows for that blocked session. The maximum number of blocker sessions displayed for a single blocked session is 30. If a session is not blocked by other sessions, then there will be no row in this view for that session.

Column	Datatype	Description
SID	NUMBER	Blocked session's Oracle session identifier
SESS_SERIAL#	NUMBER	Blocked session's Oracle session serial number
WAIT_ID	NUMBER	A number identifying the wait for the blocked session
WAIT_EVENT	NUMBER	Resource or event number for which the blocked session is waiting
WAIT_EVENT_TEXT	VARCHAR2(64)	Resource or event for which the blocked session is waiting
BLOCKER_INSTANCE_ID	NUMBER	Blocker session's instance identifier
BLOCKER_SID	NUMBER	Blocker session's Oracle session identifier
BLOCKER_SESS_SERIAL#	NUMBER	Blocker session's Oracle session serial number
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