Note
This view is introduced since OceanBase Database V4.0.0.
Purpose
The V$OB_PLAN_CACHE_STAT view displays the overall status of each plan cache on the current OBServer nodes of all tenants.
Columns
Column |
Type |
Nullable? |
Description |
|---|---|---|---|
| TENANT_ID | bigint(20) | NO | The ID of the tenant. |
| SVR_IP | varchar(46) | NO | The IP address of the OBServer node. |
| SVR_PORT | bigint(20) | NO | The port number of the OBServer node. |
| SQL_NUM | bigint(20) | NO | The number of SQL statements in the plan cache. |
| MEM_USED | bigint(20) | NO | The size of memory that the plan cache occupies. |
| MEM_HOLD | bigint(20) | NO | The size of memory that the plan cache holds. |
| ACCESS_COUNT | bigint(20) | NO | The number of times that the query accesses the plan cache. |
| HIT_COUNT | bigint(20) | NO | The number of plan cache hits. |
| HIT_RATE | bigint(20) | NO | The hit rate of the plan cache. |
| PLAN_NUM | bigint(20) | NO | The number of plans. |
| MEM_LIMIT | bigint(20) | NO | The maximum size of memory that the plan cache can occupy. |
| HASH_BUCKET | bigint(20) | NO | The number of buckets in the hash map of the plan cache. |
| STMTKEY_NUM | bigint(20) | NO | The number of stmt_keys in the plan cache. |
Sample query
In a user tenant, view the overall plan cache status of the tenant on the current node.
obclient [oceanbase]> SELECT * FROM oceanbase.V$OB_PLAN_CACHE_STAT;
The query result is as follows:
+-----------+----------------+----------+---------+----------+----------+--------------+-----------+----------+----------+-----------+-------------+-------------+
| TENANT_ID | SVR_IP | SVR_PORT | SQL_NUM | MEM_USED | MEM_HOLD | ACCESS_COUNT | HIT_COUNT | HIT_RATE | PLAN_NUM | MEM_LIMIT | HASH_BUCKET | STMTKEY_NUM |
+-----------+----------------+----------+---------+----------+----------+--------------+-----------+----------+----------+-----------+-------------+-------------+
| 1002 | 11.xxx.xxx.xxx | 28825 | 462 | 5906439 | 75497472 | 4828434 | 4824966 | 99 | 462 | 214748360 | 49157 | 0 |
+-----------+----------------+----------+---------+----------+----------+--------------+-----------+----------+----------+-----------+-------------+-------------+
1 row in set