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 |