Lu, Huayi
a24ca60074
Reviewed-by: Hasko, Vladimir <vladimir.hasko@t-systems.com> Co-authored-by: Lu, Huayi <luhuayi@huawei.com> Co-committed-by: Lu, Huayi <luhuayi@huawei.com>
11 KiB
PLAN_TABLE_DATA
PLAN_TABLE_DATA displays the plan information collected by EXPLAIN PLAN. Different from the PLAN_TABLE view, the system catalog PLAN_TABLE_DATA stores the 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 |
ID of a plan to be queried |
id |
int |
Node ID in a plan |
operation |
varchar2(30) |
Operation description |
options |
varchar2(255) |
Operation parameters |
object_name |
name |
Name of an operated object. It is defined by users. |
object_type |
varchar2(30) |
Object type |
object_owner |
name |
User-defined schema to which an object belongs |
projection |
varchar2(4000) |
Returned column information |
- 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 only their own data in the PLAN_TABLE view.
- Data of inactive (exited) sessions is cleaned from PLAN_TABLE_DATA by gs_clean after being stored in this system catalog for a certain period of time (5 minutes by default). You can also manually run gs_clean -C to delete inactive session data from the table..
- 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.