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Add some real documentation about TOAST (finally). Combine this with

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the old 'page' chapter and the recently added 'filelayout' chapter to
make a coherent chapter about PostgreSQL's physical storage layout.
This commit is contained in:
Tom Lane
2005-01-10 00:04:43 +00:00
parent 521e8888e9
commit ab3bb9cf78
9 changed files with 704 additions and 535 deletions
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12
doc/src/sgml/ref/alter_table.sgml
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@@ -1,5 +1,5 @@
<!--
$PostgreSQL: pgsql/doc/src/sgml/ref/alter_table.sgml,v 1.75 2005/01/04 00:39:53 tgl Exp $
$PostgreSQL: pgsql/doc/src/sgml/ref/alter_table.sgml,v 1.76 2005/01/10 00:04:43 tgl Exp $
PostgreSQL documentation
-->
@@ -153,10 +153,14 @@ where <replaceable class="PARAMETER">action</replaceable> is one of:
inline, uncompressed. <literal>MAIN</literal> is for inline,
compressible data. <literal>EXTERNAL</literal> is for external,
uncompressed data, and <literal>EXTENDED</literal> is for external,
compressed data. <literal>EXTENDED</literal> is the default for all
data types that support it. Use of <literal>EXTERNAL</literal> will
compressed data. <literal>EXTENDED</literal> is the default for most
data types that support non-<literal>PLAIN</literal> storage.
Use of <literal>EXTERNAL</literal> will
make substring operations on <type>text</type> and <type>bytea</type>
columns faster, at the penalty of increased storage space.
columns faster, at the penalty of increased storage space. Note that
<literal>SET STORAGE</> doesn't itself change anything in the table,
it just sets the strategy to be pursued during future table updates.
See <xref linkend="storage-toast"> for more information.
</para>
</listitem>
</varlistentry>