php-doc-en/reference/session_pgsql/tables.xml

<?xml version="1.0" encoding="utf-8"?>
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<chapter xml:id="session-pgsql.tables">
 <title>Table definitions</title>
 <para>
  Session table definition
  <programlisting role="sql">
<![CDATA[
CREATE TABLE php_session (
 sess_id            text,
 sess_name          text,
 sess_data          text,
 sess_created       integer,
 sess_modified      integer,
 sess_expire        integer,
 sess_addr_created  text,
 sess_addr_modified text,
 sess_counter       integer,
 sess_error         integer,
 sess_warning       integer,
 sess_notice        integer,
 sess_err_message   text,
 sess_custom        text
);

CREATE INDEX php_session_idx ON php_session USING BTREE (sess_id);
]]>
  </programlisting>
 </para>
 <warning>
  <para>
   If you use <literal>HASH</literal> for <literal>INDEX</literal>, you'll
   have a deadlock problem when the server load is
   <emphasis>very</emphasis> high. Even if it's unlikely to have a deadlock
   under normal operation, it can occur. <emphasis>Do not use
   <literal>HASH</literal> for <literal>INDEX</literal></emphasis>.
  </para>
 </warning>
 <para>
  You may change the session table as long as all fields are defined.
 </para>
 <para>
  Application variables table definition
  <programlisting role="sql">
<![CDATA[
CREATE TABLE php_app_vars (
 app_modified       integer,
 app_name           text,
 app_vars           text
);
]]>
  </programlisting>
 </para>
</chapter>


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