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PLAN_TABLE

Updated on 2022-06-11 GMT+08:00

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.

Table 1 PLAN_TABLE columns

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.

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