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