Note
This view is introduced since OceanBase Database V1.4.
Purpose
The V$SESSION_WAIT_HISTORY view displays the latest 10 wait events of all sessions on the current OBServer node.
Columns
| Column | Type | Nullable? | Description |
|---|---|---|---|
| SID | bigint(20) | NO | For V4.3.x:
|
| CON_ID | bigint(20) | NO | The ID of the tenant. |
| SVR_IP | varchar(46) | NO | The IP address of the OBServer node. |
| SVR_PORT | bigint(20) | NO | The port number of the OBServer node. |
| SEQ# | bigint(20) | NO | The sequence number of the wait event. |
| EVENT# | bigint(20) | NO | The number of the wait event. |
| EVENT | varchar(64) | NO | The name of the wait event. |
| P1TEXT | varchar(64) | NO | The description of the first parameter of the wait event. |
| P1 | bigint(20) unsigned | NO | The value of the first parameter of the wait event. |
| P2TEXT | varchar(64) | NO | The description of the second parameter of the wait event. |
| P2 | bigint(20) unsigned | NO | The value of the second parameter of the wait event. |
| P3TEXT | varchar(64) | NO | The description of the third parameter of the wait event. |
| P3 | bigint(20) unsigned | NO | The value of the third parameter of the wait event. |
| WAIT_TIME | double | NO | The wait time of the wait event, in hundredths of a second. |
| WAIT_TIME_MICRO | bigint(20) | NO | The wait time of the wait event, in microseconds. |
| TIME_SINCE_LAST_WAIT_MICRO | bigint(20) | NO | The amount of time in microseconds elapsed from the end of the last wait to the current wait. |
Sample query
Query the details of all current session wait events on the current node, including the most recent 10 wait events.
obclient [oceanbase]> SELECT * FROM oceanbase.V$SESSION_WAIT_HISTORY LIMIT 1\G
The query result is as follows:
*************************** 1. row ***************************
SID: 3221608040
CON_ID: 1
SVR_IP: xx.xx.xx.xx
SVR_PORT: 2882
SEQ#: 1
EVENT#: 0
EVENT:
P1TEXT:
P1: 0
P2TEXT:
P2: 0
P3TEXT:
P3: 0
WAIT_TIME: 174572146997.0574
WAIT_TIME_MICRO: 1745721469970574
TIME_SINCE_LAST_WAIT_MICRO: 0