Note
- This view is available starting with V4.3.5 for V4.3.x.
- This view is available starting with V4.2.2 for V4.2.x.
Purpose
The DBA_WR_SYSTEM_EVENT view displays the persistent tenant-level wait event information of the current tenant.
Columns
| Column | Type | Nullable? | Description |
|---|---|---|---|
| SNAP_ID | bigint(20) | NO | Snapshot ID |
| SVR_IP | varchar(46) | NO | Node IP |
| SVR_PORT | bigint(20) | NO | Node port number |
| EVENT_ID | bigint(20) | NO | Wait event ID |
| EVENT_NAME | varchar(64) | YES | Wait event name |
| WAIT_CLASS_ID | bigint(20) | YES | Wait event category ID |
| WAIT_CLASS | varchar(64) | YES | Wait event category name |
| TOTAL_WAITS | bigint(20) | YES | Total number of wait events |
| TOTAL_TIMEOUTS | bigint(20) | YES | Total number of timeouts |
| TIME_WAITED_MICRO | bigint(20) | YES | Total wait time |
The WAIT_CLASS column in the view contains the wait event category name and corresponding wait event ID as shown in the following table.
| Wait event category name | Wait event ID | Description |
|---|---|---|
| OTHER | 100 | Wait events not belonging to other categories |
| APPLICATION | 101 | Wait events caused by client code |
| CONFIGURATION | 102 | Wait events caused by insufficient database or instance resource configuration |
| ADMINISTRATIVE | 103 | Wait events caused by database administrator commands |
| CONCURRENCY | 104 | Wait events for internal database resources |
| COMMIT | 105 | Wait events related to log submission |
| IDLE | 106 | Wait events for inactive sessions |
| NETWORK | 107 | Wait events related to network communication |
| USER_IO | 108 | Wait events for user I/O |
| SYSTEM_IO | 109 | Wait events for background process I/O |
| CLUSTER | 111 | Wait events related to clusters |
Sample query
Query the persistent tenant-level wait event information of the current tenant and display the first 10 records.
obclient [oceanbase]> SELECT * FROM oceanbase.DBA_WR_SYSTEM_EVENT LIMIT 10;
The query result is as follows:
+---------+----------------+----------+----------+-----------------------------------+---------------+-------------+-------------+----------------+-------------------+
| SNAP_ID | SVR_IP | SVR_PORT | EVENT_ID | EVENT_NAME | WAIT_CLASS_ID | WAIT_CLASS | TOTAL_WAITS | TOTAL_TIMEOUTS | TIME_WAITED_MICRO |
+---------+----------------+----------+----------+-----------------------------------+---------------+-------------+-------------+----------------+-------------------+
| 1 | 172.xx.xxx.xxx | 2882 | 2 | latch: default spin rwlock wait | 104 | CONCURRENCY | 9 | 0 | 2514 |
| 1 | 172.xx.xxx.xxx | 2882 | 3 | latch: default mutex wait | 104 | CONCURRENCY | 318 | 0 | 14740 |
| 1 | 172.xx.xxx.xxx | 2882 | 8 | latch: trans ctx latch wait | 104 | CONCURRENCY | 15 | 0 | 15244 |
| 1 | 172.xx.xxx.xxx | 2882 | 40 | latch: config lock wait | 104 | CONCURRENCY | 14 | 0 | 207794 |
| 1 | 172.xx.xxx.xxx | 2882 | 99 | latch: tablet bucket lock wait | 104 | CONCURRENCY | 1 | 0 | 1334 |
| 1 | 172.xx.xxx.xxx | 2882 | 258 | latch: palf handle impl lock wait | 104 | CONCURRENCY | 3 | 0 | 186 |
| 1 | 172.xx.xxx.xxx | 2882 | 283 | latch: ls meta lock wait | 104 | CONCURRENCY | 26 | 0 | 3568 |
| 1 | 172.xx.xxx.xxx | 2882 | 10001 | db file data read | 108 | USER_IO | 2 | 0 | 3946 |
| 1 | 172.xx.xxx.xxx | 2882 | 11001 | db file compact read | 109 | SYSTEM_IO | 1545 | 0 | 816400 |
| 1 | 172.xx.xxx.xxx | 2882 | 11002 | db file compact write | 109 | SYSTEM_IO | 10292 | 0 | 1420220 |
+---------+----------------+----------+----------+-----------------------------------+---------------+-------------+-------------+----------------+-------------------+
10 rows in set