Note
This view is introduced since OceanBase Database V4.0.0.
Purpose
The V$OB_PLAN_CACHE_PLAN_EXPLAIN view displays the physical execution plans that are cached in the plan cache on the current OBServer node.
Note
This view supports only GET operations. To query information in this view, you must specify the TENANT_ID and PLAN_ID columns.
Columns
Column |
Type |
Nullable? |
Description |
|---|---|---|---|
| TENANT_ID | bigint(20) | NO | The ID of the tenant. |
| SVR_IP | varchar(46) | NO | The IP address of the OBServer node. |
| SVR_PORT | bigint(20) | NO | The port number of the OBServer node. |
| PLAN_ID | bigint(20) | NO | The ID of the plan. |
| PLAN_DEPTH | bigint(20) | NO | The display depth of the operator. |
| PLAN_LINE_ID | bigint(20) | NO | The ID of the operator. |
| OPERATOR | varchar(128) | NO | The name of the operator. |
| NAME | varchar(256) | NO | The name of the table. |
| ROWS | bigint(20) | NO | The estimated number of rows in the result. |
| COST | bigint(20) | NO | The estimated cost. |
| PROPERTY | varchar(4096) | NO | The information about the corresponding operator. |
Sample query
Query the V$OB_PLAN_CACHE_PLAN_STAT view for the
PLAN_IDvalue of the current OBServer node.obclient [oceanbase]> SELECT PLAN_ID FROM oceanbase.V$OB_PLAN_CACHE_PLAN_STAT limit 2;The query result is as follows:
+---------+ | PLAN_ID | +---------+ | 605 | | 607 | +---------+ 2 rows in set (0.010 sec)Query the
V$OB_PLAN_CACHE_PLAN_EXPLAINview for the physical execution plan with thePLAN_IDvalue of605in the plan cache.obclient [oceanbase]> SELECT * FROM oceanbase.V$OB_PLAN_CACHE_PLAN_EXPLAIN WHERE PLAN_ID = 605\GThe query result is as follows:
*************************** 1. row *************************** TENANT_ID: 1002 SVR_IP: xx.xx.xx.xx SVR_PORT: 2882 PLAN_ID: 605 PLAN_DEPTH: 0 PLAN_LINE_ID: 0 OPERATOR: PHY_TABLE_SCAN NAME: __all_balance_task ROWS: 1 COST: 2 PROPERTY: table_rows:1, physical_range_rows:1, logical_range_rows:1, index_back_rows:0, output_rows:1, avaiable_index_name[__all_balance_task] 1 row in set (0.000 sec)