PLAN_TABLE displays the plan information collected by EXPLAIN PLAN. Plan information is in a session-level life cycle. After the session exits, the data will be deleted. Data is isolated between sessions and between users.
Column |
Type |
Description |
|---|---|---|
statement_id |
varchar2(30) |
Query tag specified by a user |
plan_id |
Bigint |
ID of a plan to be queried |
id |
Int |
ID of each operator in a generated plan |
operation |
varchar2(30) |
Operation description of an operator in a plan |
options |
varchar2(255) |
Operation parameters |
object_name |
Name |
Name of an operated object. It is defined by users, not the object alias used in the query. |
object_type |
varchar2(30) |
Object type |
object_owner |
Name |
User-defined schema to which an object belongs |
projection |
varchar2(4000) |
Returned column information |
- A valid object_type value consists of a relkind type defined in PG_CLASS (TABLE ordinary table, INDEX, SEQUENCE, VIEW, FOREIGN TABLE, COMPOSITE TYPE, or TOASTVALUE TOAST table) and the rtekind type used in the plan (SUBQUERY, JOIN, FUNCTION, VALUES, CTE, or REMOTE_QUERY).
- For RangeTableEntry (RTE), object_owner is the object description used in the plan. Non-user-defined objects do not have object_owner.
- 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.
- PLAN_TABLE supports only SELECT and DELETE and does not support other DML operations.