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Diffstat (limited to 'src/bin/pgaccess/lib/help/explain.hlp')
| -rw-r--r-- | src/bin/pgaccess/lib/help/explain.hlp | 23 |
1 files changed, 0 insertions, 23 deletions
diff --git a/src/bin/pgaccess/lib/help/explain.hlp b/src/bin/pgaccess/lib/help/explain.hlp deleted file mode 100644 index fccab573123..00000000000 --- a/src/bin/pgaccess/lib/help/explain.hlp +++ /dev/null @@ -1,23 +0,0 @@ -.pgaw:Help.f.t insert end "EXPLAIN" {bold} " 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. - -" {} "Synopsis" {bold} " -" {} " -EXPLAIN \[ VERBOSE \] query - -" {code} "Usage" {bold} " - -To show a query plan for a simple query: -" {} " -postgres=> explain select * from foo; -NOTICE: QUERY PLAN: - -Seq Scan on foo (cost=0.00 rows=0 width=4) - -EXPLAIN - -" {code} "Notes" {bold} " - -There 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." |