PLAN_TABLE

PLAN_TABLE displays plan information collected by EXPLAIN PLAN. Plan information is in a session-level lifecycle. After a session exits, the data will be deleted. Data is isolated between sessions and between users.

Table 1 PLAN_TABLE columns

Name	Type	Description
statement_id	varchar2(30)	Query tag specified by a user
plan_id	bigint	Query ID
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 action
object_name	name	Object name corresponding to the operation, which is not the object alias used in the query. The object name 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

NOTE:

• A valid object_type value consists of a relkind type defined in PG_CLASS (TABLE, INDEX, SEQUENCE, VIEW, COMPOSITE TYPE, or TOASTVALUE TOAST) 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.