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<title>Shared Object Cache in Apache HTTP Server - Apache HTTP Server</title>
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<p class="apache">Apache HTTP Server Version 2.3</p>
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<a href="http://www.apache.org/">Apache</a> > <a href="http://httpd.apache.org/">HTTP Server</a> > <a href="http://httpd.apache.org/docs/">Documentation</a> > <a href="./">Version 2.3</a></div><div id="page-content"><div id="preamble"><h1>Shared Object Cache in Apache HTTP Server</h1>
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<p>The Shared Object Cache provides a means to share simple data
across all a server's workers, regardless of <a href="mpm.html">thread
and process models</a>. It is used where the advantages of sharing
data across processes outweigh the performance overhead of
inter-process communication.</p>
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<h2><a name="providers" id="providers">Shared Object Cache Providers</a></h2>
<p>The shared object cache as such is an abstraction. Four different
modules implement it. To use the cache, one or more of these modules
must be present, and configured.</p>
<p>The only configuration required is to select which cache provider
to use. This is the responsibility of modules using the cache, and
they enable selecton using directives such as
<code class="directive"><a href="./mod/authn_socache.html#authncachesocache">AuthnCacheSOCache</a></code>,
<code class="directive"><a href="./mod/ssl.html#sslsessioncache">SSLSessionCache</a></code>, and
<code class="directive"><a href="./mod/ssl.html#sslstaplingcache">SSLStaplingCache</a></code>.</p>
<p>Currently available providers are:</p>
<dl>
<dt>"dbm" (mod_socache_dbm)</dt>
<dd>This makes use of a DBM hash file.
The choice of underlying DBM configuration may be configurable
if the installed APR version supports multiple DBM implementations.</dd>
<dt>"dc" (mod_socache_dc)</dt>
<dd>This makes use of the <a href="http://www.distcache.org/">distcache</a>
distributed session caching libraries.</dd>
<dt>"mc" (mod_socache_memcache)</dt>
<dd>This makes use of the <a href="http://memcached.org/">memcached</a>
high-performance, distributed memory object caching system.</dd>
<dt>"shmcb" (mod_socache_shmcb)</dt>
<dd>This makes use of a high-performance cyclic buffer inside a
shared memory segment.</dd>
</dl>
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