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Document BRIN's pages_per_range in CREATE INDEX

Author: Michael Paquier

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`@@ -380,6 +380,23 @@ CREATE [ UNIQUE ] INDEX [ CONCURRENTLY ] [ [ IF NOT EXISTS ] <replaceable class=`
`380`	`380`	`</listitem>`
`381`	`381`	`</varlistentry>`
`382`	`382`	`</variablelist>`
	`383`	`+`
	`384`	`+ <para>`
	`385`	`+ <acronym>BRIN</> indexes accept a different parameter:`
	`386`	`+ </para>`
	`387`	`+`
	`388`	`+ <variablelist>`
	`389`	`+ <varlistentry>`
	`390`	`+ <term><literal>pages_per_range</></term>`
	`391`	`+ <listitem>`
	`392`	`+ <para>`
	`393`	`+ Defines the number of table blocks that make up one block range for`
	`394`	`+ each entry of a <acronym>BRIN</> index (see <xref linkend="brin-intro">`
	`395`	`+ for more details). The default is <literal>128</>.`
	`396`	`+ </para>`
	`397`	`+ </listitem>`
	`398`	`+ </varlistentry>`
	`399`	`+ </variablelist>`
`383`	`400`	`</refsect2>`
`384`	`401`
`385`	`402`	`<refsect2 id="SQL-CREATEINDEX-CONCURRENTLY">`

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