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.\" This is -*-nroff-*- |
.\" This is -*-nroff-*- |
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.\" XXX standard disclaimer belongs here.... |
.\" XXX standard disclaimer belongs here.... |
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.\" $Header: /cvsroot/pgsql/src/man/Attic/explain.l,v 1.3 1996/12/29 19:31:16 momjian Exp $ |
.\" $Header: /cvsroot/pgsql/src/man/Attic/explain.l,v 1.4 1997/01/16 14:56:59 momjian Exp $ |
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.TH EXPLAIN SQL 11/05/95 PostgreSQL PostgreSQL |
.TH EXPLAIN SQL 11/05/95 PostgreSQL PostgreSQL |
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.SH NAME |
.SH NAME |
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explain \(em explains statement execution details |
explain \(em explains statement execution details |
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.SH SYNOPSIS |
.SH SYNOPSIS |
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.nf |
.nf |
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\fBexplain [with\fP \fB{cost|plan|full}]\fR query |
\fBexplain [verbose]\fR query |
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.fi |
.fi |
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.SH DESCRIPTION |
.SH DESCRIPTION |
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This command outputs details about the supplied query. The default |
This command outputs details about the supplied query. The default |
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output is the computed query cost. \f2plan\f1 displays the full query |
output is the computed query cost. \f2verbose\f1 displays the full query |
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plan. \f2full\f1 display both query plan and query cost. |
plan and cost. |
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.PP |
.PP |
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The query cost and plan can be affected by running vacuum. |
The query cost and plan can be affected by running vacuum. |
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