docs/en-US/set-database-buffer-pool-size.xml

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<section id="set-database-buffer-pool-size">
    <title>Set Database Buffer Pool Size</title>
    <para>It is important to provide enough memory space for the MySQL database to cache data and indexes:</para>
    <orderedlist>
        <listitem><para>Edit the Tomcat configuration file:</para><programlisting>/etc/my.cnf</programlisting></listitem>
        <listitem><para>Insert the following line in the [mysqld] section, below the datadir line. Use a value that is appropriate for your situation. We recommend setting the buffer pool at 40% of RAM if MySQL is on the same server as the management server or 70% of RAM if MySQL has a dedicated server. The following example assumes a dedicated server with 1024M of RAM.</para>
            <programlisting>innodb_buffer_pool_size=700M</programlisting></listitem>
        <listitem><para>Restart the MySQL service.</para><programlisting># service mysqld restart</programlisting></listitem>
      </orderedlist>
    <para>For more information about the buffer pool, see "The InnoDB Buffer Pool" at <ulink url="http://dev.mysql.com/doc/refman/5.5/en/innodb-buffer-pool.html">MySQL Reference Manual</ulink>.</para>
</section>