Note
This view is available starting with V4.0.0.
Purpose
This view displays the overall status of the plan cache for the current tenant on the current OBServer node.
Columns
| Column | Type | Nullable | Description |
|---|---|---|---|
| TENANT_ID | bigint(20) | NO | The tenant ID. |
| SVR_IP | varchar(46) | NO | The IP address of the server. |
| SVR_PORT | bigint(20) | NO | The port number. |
| SQL_NUM | bigint(20) | NO | The number of SQL statements involved in the plan cache. |
| MEM_USED | bigint(20) | NO | The amount of memory used by the plan cache. |
| MEM_HOLD | bigint(20) | NO | The amount of memory held by the plan cache. |
| ACCESS_COUNT | bigint(20) | NO | The number of times the plan cache has been accessed. |
| HIT_COUNT | bigint(20) | NO | The number of 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 memory size of the plan cache, in bytes. |
| 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
Query the overall status of the plan cache for the current 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