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POPHP and pgbouncer in transaction mode: current transaction is aborted
 

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    <p>I run a Drupal 7.2 web site embedding <a href="http://apps.facebook.com/video-preferans/" rel="nofollow">a flash game</a> with few custom PHP scripts for the player stats. Using CentOS 5.6/64 bit, PostgreSQL 8.4.8 and PHP 5.3. It is a Quad-Opteron with 4GB RAM.</p> <p>At the peak times (when there are around 500 players online) my web site used to went down with too many postmaster processes. On the advice of <a href="http://groups.google.com/group/pgsql.general/msg/21ce0df6a6023c79" rel="nofollow">pgsql-general mailing list</a> I have installed pgbouncer 1.3.4 with the following /etc/pgbouncer.ini:</p> <pre><code>[databases] pref = host=/tmp user=pref password=XXX dbname=pref [pgbouncer] logfile = /var/log/pgbouncer.log pidfile = /var/run/pgbouncer/pgbouncer.pid listen_port = 6432 unix_socket_dir = /tmp auth_type = md5 auth_file = /var/lib/pgsql/data/global/pg_auth pool_mode = transaction ;pool_mode = session server_check_delay = 10 max_client_conn = 200 default_pool_size = 16 log_connections = 0 log_disconnections = 0 log_pooler_errors = 1 </code></pre> <p>And have increased shared_buffers = 1024MB and decreased max_connections = 50 in postgresql.conf.</p> <p>This has helped, but I have often a problem that a prepared PDO statement won't be found:</p> <pre><code>SQLSTATE[26000]: Invalid sql statement name: 7 ERROR: prepared statement "pdo_stmt_00000016" does not exist </code></pre> <ul> <li>probably because pgbouncer switches the connection between a prepare() and execute().</li> </ul> <p>I can't switch pgbouncer to session mode - my web site will hang.</p> <p>I've tried adding <strong>PDO::ATTR_EMULATE_PREPARES => true</strong> - my web site hangs too.</p> <p>I've added beginTransaction() and commit() around each prepare() and execute() call - but then I get the following error very often:</p> <pre><code>SQLSTATE[25P02]: In failed sql transaction: 7 ERROR: current transaction is aborted, commands ignored until end of transaction block </code></pre> <p>Below is an excerpt of my code failing with that error - it is very straightforward and just calls five SELECT statements:</p> <pre><code>function fetch_top() { $table = ''; $top = ''; try { # throw exception on any errors $options = array(PDO::ATTR_ERRMODE =&gt; PDO::ERRMODE_EXCEPTION); $db = new PDO(sprintf('pgsql:host=%s port=%u; dbname=%s', DBHOST, DBPORT, DBNAME), DBUSER, DBPASS, $options); # last week's winner $db-&gt;beginTransaction(); $sth = $db-&gt;prepare(" select u.id, u.first_name, u.avatar, u.female, u.city, m.money, u.login &gt; u.logout as online from pref_users u, pref_money m where m.yw=to_char(current_timestamp - interval '1 week', 'IYYY-IW') and u.id=m.id order by m.money desc limit 1 "); $sth-&gt;execute(); $winner = $sth-&gt;fetch(PDO::FETCH_OBJ); $db-&gt;commit(); $db-&gt;beginTransaction(); $sth = $db-&gt;prepare(' select count(id) from ( select id, row_number() over(partition by yw order by money desc) as ranking from pref_money ) x where x.ranking = 1 and id=? '); $sth-&gt;execute(array($winner-&gt;id)); $winner_medals = $sth-&gt;fetchColumn(); $db-&gt;commit(); # current week leader $db-&gt;beginTransaction(); $sth = $db-&gt;prepare(" select u.id, u.first_name, u.avatar, u.female, u.city, m.money, u.login &gt; u.logout as online from pref_users u, pref_money m where m.yw=to_char(current_timestamp, 'IYYY-IW') and u.id=m.id order by m.money desc limit 1 "); $sth-&gt;execute(); $leader = $sth-&gt;fetch(PDO::FETCH_OBJ); $db-&gt;commit(); $db-&gt;beginTransaction(); $sth = $db-&gt;prepare(' select count(id) from ( select id, row_number() over(partition by yw order by money desc) as ranking from pref_money ) x where x.ranking = 1 and id=? '); $sth-&gt;execute(array($leader-&gt;id)); $leader_medals = $sth-&gt;fetchColumn(); $db-&gt;commit(); # fetch top players $db-&gt;beginTransaction(); $sth = $db-&gt;prepare(" select u.id, u.first_name, u.female, u.city, m.money, u.login &gt; u.logout as online from pref_users u, pref_money m where m.yw=to_char(current_timestamp, 'IYYY-IW') and u.id=m.id order by m.money desc limit 7 "); $sth-&gt;execute(); $i = 0; while ($player = $sth-&gt;fetch(PDO::FETCH_OBJ)) { $top .= user_link($player) . ($i++ &gt; 0 ? '' : '&amp;nbsp;&amp;raquo;') . '&lt;br /&gt;'; } $db-&gt;commit(); # create the HTML table $table = sprintf('.... skipped for brevity ....'); } catch (Exception $e) { exit('Database problem: ' . $e-&gt;getMessage()); } return $table; } </code></pre> <p>Any help please? Alex</p>
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