Note
This view is introduced since OceanBase Database V4.2.0.
Purpose
The V$OB_THREAD view displays the status information about all threads in the observer process. In a user tenant, it shows the status information about all threads in the current tenant.
Columns
| Column | Type | Nullable? | Description |
|---|---|---|---|
| SVR_IP | varchar(46) | NO | The IP address of the observer process. |
| SVR_PORT | bigint(20) | NO | The port number of the observer process. |
| TENANT_ID | bigint(20) | NO | The ID of the tenant to which the thread belongs. The value is 500 for a process-level thread. |
| TID | bigint(20) | NO | The ID of the thread. |
| TNAME | varchar(16) | NO | The name of the thread. |
| STATUS | varchar(32) | NO | The status of the thread. Valid values:
|
| LATCH_WAIT | varchar(16) | NO | The address of the latch that the thread is waiting for. |
| LATCH_HOLD | varchar(256) | NO | The address of the latch held by the thread. Multiple latches may be held by the thread. |
| TRACE_ID | varchar(40) | NO | The ID of the trace that is being executed by the thread. |
| CGROUP_PATH | varchar(256) | NO | The path of the cgroup to which the thread belongs. This field is obtained from the CPU line in the /proc/observer-pid/task/tid/cgroup file. |
Sample query
In a user tenant, view the status of all threads in the observer process of the current OBServer node, and display the first two records.
obclient > SELECT * FROM oceanbase.V$OB_THREAD LIMIT 2;
The query result is as follows:
+----------------+----------+-----------+--------+-----------------+--------+------------+------------+-----------------------------------+-------------+
| SVR_IP | SVR_PORT | TENANT_ID | TID | TNAME | STATUS | LATCH_WAIT | LATCH_HOLD | TRACE_ID | CGROUP_PATH |
+----------------+----------+-----------+--------+-----------------+--------+------------+------------+-----------------------------------+-------------+
| xx.xx.xx.xx | 2882 | 1004 | 121695 | T1004_TTLTablet | Wait | | | YB42AC1E87E6-00060C5DCDEFE9E5-0-0 | |
| xx.xx.xx.xx | 2882 | 1004 | 121689 | T1004_TTLManage | Wait | | | YB42AC1E87E6-00060C5DCDAFE4D5-0-0 | |
+----------------+----------+-----------+--------+-----------------+--------+------------+------------+-----------------------------------+-------------+
2 rows in set
