Note
This view is available starting with V4.0.0.
Purpose
The GV$OB_PLAN_CACHE_PLAN_EXPLAIN view displays the physical execution plans cached in all OBServer nodes.
Note
This view supports only GET operations. When you query this view, you must specify the IP, PORT, TENANT_ID, and PLAN_ID columns.
Columns
| Column | Type | Nullable | Description |
|---|---|---|---|
| TENANT_ID | bigint(20) | NO | The tenant ID. |
| SVR_IP | varchar(46) | NO | The IP address of the server. |
| SVR_PORT | bigint(20) | NO | The port number of the server. |
| PLAN_ID | bigint(20) | NO | The ID of the plan. |
| PLAN_DEPTH | bigint(20) | NO | The depth of the operator when displayed. |
| PLAN_LINE_ID | bigint(20) | NO | The ID of the operator. |
| OPERATOR | varchar(128) | NO | The name of the operator. |
| NAME | varchar(256) | NO | The name of the table. |
| ROWS | bigint(20) | NO | The estimated number of rows. |
| COST | bigint(20) | NO | The estimated cost. |
| PROPERTY | varchar(4096) | NO | The information about the corresponding operator. |
Sample query
Query the
PLAN_IDcolumn from the GV$OB_PLAN_CACHE_PLAN_STAT view.obclient [oceanbase]> SELECT PLAN_ID FROM oceanbase.GV$OB_PLAN_CACHE_PLAN_STAT limit 2;The query result is as follows:
+---------+ | PLAN_ID | +---------+ | 605 | | 607 | +---------+ 2 rows in set (0.010 sec)Query the physical execution plan in the plan cache by using the
GV$OB_PLAN_CACHE_PLAN_EXPLAINview. For example, setPLAN_ID=605.obclient [oceanbase]> SELECT * FROM oceanbase.GV$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)