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Diffstat (limited to 'doc/src/sgml/ref/explain.sgml')
| -rw-r--r-- | doc/src/sgml/ref/explain.sgml | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/doc/src/sgml/ref/explain.sgml b/doc/src/sgml/ref/explain.sgml index 5f4a8063f43..a1914c75ce3 100644 --- a/doc/src/sgml/ref/explain.sgml +++ b/doc/src/sgml/ref/explain.sgml @@ -102,6 +102,8 @@ Description <PARA> This command outputs details about the supplied query. The default output is the computed query cost. + The cost value is only meaningful to the optimizer in comparing + various query plans. VERBOSE displays the full query plan and cost to your screen, and pretty-prints the plan to the postmaster log file. </para> @@ -135,7 +137,7 @@ To 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) +Seq Scan on foo (cost=0.00 rows=0 width=4) EXPLAIN </ProgramListing> |