PLAN_TABLE¶
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.
Name | 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 |
Note
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.