PLAN_TABLE_DATA
PLAN_TABLE_DATA stores plan information collected by EXPLAIN PLAN. Different from the PLAN_TABLE view, the system catalog PLAN_TABLE_DATA stores EXPLAIN PLAN information collected by all sessions and users.
Name |
Type |
Description |
---|---|---|
session_id |
text |
Session that inserts the data. Its value consists of a service thread start timestamp and a service thread ID. Values are constrained by NOT NULL. |
user_id |
oid |
User who inserts the data. Values are constrained by NOT NULL. |
statement_id |
varchar2(30) |
Query tag specified by a user |
plan_id |
bigint |
Query ID The ID is automatically generated in the plan generation phase and is used by kernel engineers for debugging. |
id |
integer |
Node ID in a plan |
operation |
varchar2(30) |
Operation description |
options |
varchar2(255) |
Operation action |
object_name |
name |
Name of an operated object. It is defined by users. |
object_type |
varchar2(30) |
Object type |
object_owner |
name |
Schema to which the object belongs. It is defined by users. |
projection |
varchar2(4000) |
Returned column information |
cost |
double precision |
Execution cost estimated by the optimizer for an operator |
cardinality |
double precision |
Number of rows estimated by the optimizer for an operator |
![](https://support.huaweicloud.com/intl/en-us/centralized-devg-v2-gaussdb/public_sys-resources/note_3.0-en-us.png)
- PLAN_TABLE_DATA records data of all users and sessions on the current node. Only administrators can access all the data. Common users can view their own data in the PLAN_TABLE view.
- Data is automatically inserted into PLAN_TABLE_DATA after EXPLAIN PLAN is executed. Therefore, do not manually insert data into or update data in PLAN_TABLE_DATA. Otherwise, data in PLAN_TABLE_DATA may be disordered. To delete data from PLAN_TABLE_DATA, you are advised to use the PLAN_TABLE view.
- Information in the statement_id, object_name, object_owner, and projection columns is stored in letter cases specified by users and information in other columns is stored in uppercase.
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