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Extend yesterday's patch making BLCKSZ and RELSEG_SIZE configurable to also

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let XLOG_BLCKSZ and XLOG_SEG_SIZE be set via configure.  Per a proposal by
Mark Wong, though I thought it better to call the switches after "wal" rather
than "xlog".
This commit is contained in:
Tom Lane
2008-05-02 19:52:37 +00:00
parent b3fb2d6505
commit cf9f6c8d8e
6 changed files with 220 additions and 31 deletions
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30
doc/src/sgml/installation.sgml
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@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/installation.sgml,v 1.308 2008/05/02 01:08:26 tgl Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/installation.sgml,v 1.309 2008/05/02 19:52:37 tgl Exp $ -->
<chapter id="installation">
<title><![%standalone-include[<productname>PostgreSQL</>]]>
@ -1103,6 +1103,34 @@ su - postgres
</listitem>
</varlistentry>
<varlistentry>
<term><option>--with-wal-segsize=<replaceable>SEGSIZE</replaceable></option></term>
<listitem>
<para>
Set the <firstterm>WAL segment size</>, in megabytes. This is
the size of each individual file in the WAL log. It may be useful
to adjust this size to control the granularity of WAL log shipping.
The default size is 16 megabytes.
The value must be a power of 2 between 1 and 64 (megabytes).
Note that changing this value requires an initdb.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>--with-wal-blocksize=<replaceable>BLOCKSIZE</replaceable></option></term>
<listitem>
<para>
Set the <firstterm>WAL block size</>, in kilobytes. This is the unit
of storage and I/O within the WAL log. The default, 8 kilobytes,
is suitable for most situations; but other values may be useful
in special cases.
The value must be a power of 2 between 1 and 64 (kilobytes).
Note that changing this value requires an initdb.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>--disable-spinlocks</option></term>
<listitem>

9
doc/src/sgml/wal.sgml
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@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/wal.sgml,v 1.52 2007/12/29 17:55:07 momjian Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/wal.sgml,v 1.53 2008/05/02 19:52:37 tgl Exp $ -->
<chapter id="wal">
<title>Reliability and the Write-Ahead Log</title>
@ -487,8 +487,11 @@
<para>
<acronym>WAL</acronym> logs are stored in the directory
<filename>pg_xlog</filename> under the data directory, as a set of
segment files, normally each 16 MB in size. Each segment is divided into
pages, normally 8 kB each. The log record headers are described in
segment files, normally each 16 MB in size (but the size can be changed
by altering the <option>--with-wal-segsize</> configure option when
building the server). Each segment is divided into pages, normally
8 kB each (this size can be changed via the <option>--with-wal-blocksize</>
configure option). The log record headers are described in
<filename>access/xlog.h</filename>; the record content is dependent
on the type of event that is being logged. Segment files are given
ever-increasing numbers as names, starting at