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