EXPLAINPostgreSQL User's GuidePrevNextEXPLAINNameEXPLAIN — Shows statement execution detailsEXPLAIN [ VERBOSE ] query Inputs VERBOSEFlag to show detailed query plan. queryAny query. Outputs NOTICE: QUERY PLAN: planExplicit query plan from the Postgres backend. EXPLAINFlag sent after query plan is shown. Description This command outputs details about the supplied query. The default output is the computed query cost. VERBOSE displays the full query plan and cost to your screen, and pretty-prints the plan to the postmaster log file. NotesThere is only sparse documentation on the optimizer's use of cost information in Postgres. General information on cost estimation for query optimization can be found in database textbooks. Refer to the Programmer's Guide in the chapters on indexes and the genetic query optimizer for more information. UsageTo show a query plan for a simple query: postgres=> explain select * from foo; NOTICE: QUERY PLAN: Seq Scan on foo (cost=0.00 size=0 width=4) EXPLAIN CompatibilitySQL92 There is no EXPLAIN statement defined in SQL92.PrevHomeNextDROP VIEWUpFETCH