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
cost	float8	Execution cost estimated by the optimizer for an operator
cardinality	float8	Number of rows estimated by the optimizer for an operator

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.