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. This view exists in both PG_CATALOG and SYS schema.

**Table 1** PLAN_TABLE columns
Name	Type	Description
statement_id	character varying(30)	Query tag specified by a user.
plan_id	bigint	Query ID.
id	integer	ID of each operator in a generated plan.
operation	character varying(30)	Operation description of an operator in a plan.
options	character varying(255)	Operation option.
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	character varying(30)	Object type.
object_owner	name	Schema to which the object belongs. It is defined by users.
projection	character varying(4000)	Returned column information.
cost	double precision	Execution cost estimated by the optimizer for an operator.
cardinality	double precision	Number of rows estimated by the optimizer for an operator.
remarks	character varying(4000)	Not supported. Its value is NULL.
timestamp	timestamp(0) without time zone	Not supported. Its value is NULL.
object_node	character varying(128)	Not supported. Its value is NULL.
object_alias	character varying(261)	Not supported. Its value is NULL.
object_instance	numeric	Not supported. Its value is NULL.
optimizer	character varying(255)	Not supported. Its value is NULL.
search_columns	numeric	Not supported. Its value is NULL.
parent_id	numeric	Not supported. Its value is NULL.
depth	numeric	Not supported. Its value is NULL.
position	numeric	Not supported. Its value is NULL.
bytes	numeric	Not supported. Its value is NULL.
other_tag	character varying(255)	Not supported. Its value is NULL.
partition_start	character varying(255)	Not supported. Its value is NULL.
partition_stop	character varying(255)	Not supported. Its value is NULL.
partition_id	numeric	Not supported. Its value is NULL.
other	character varying	Not supported. Its value is NULL.
other_xml	clob	Not supported. Its value is NULL.
distribution	character varying(20)	Not supported. Its value is NULL.
cpu_cost	numeric	Not supported. Its value is NULL.
io_cost	numeric	Not supported. Its value is NULL.
temp_space	numeric	Not supported. Its value is NULL.
access_predicates	character varying(4000)	Not supported. Its value is NULL.
filter_predicates	character varying(4000)	Not supported. Its value is NULL.
time	numeric	Not supported. Its value is NULL.
qblock_name	character varying(128)	Not supported. Its value is NULL.

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.