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我运行一个Drupal 7.2网站，嵌入a flash game，其中包含几个用于玩家统计的自定义PHP脚本。使用CentOS 5.6/64位，PostgreSQL 8.4.8和PHP 5.3。这是一款配备4GB RAM的Quad-Opteron。PHP和pgbouncer处于交易模式：当前交易已中止
在高峰时期（当网上有大约500名玩家时），我的网站曾经因为postmaster程序过多而倒闭。对pgsql-general mailing list建议我安装pgbouncer 1.3.4具有以下/etc/pgbouncer.ini：
[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
，并增加的shared_buffers = 1024MB，并在postgresql.conf中下降的max_connections = 50。
这帮助，但我经常一个准备PDO语句不会被发现了一个问题：
SQLSTATE[26000]: Invalid sql statement name: 7 ERROR: prepared statement "pdo_stmt_00000016" does not exist
- 可能是因为pgbouncer来切换准备（）之间的连接和执行（）。
我无法将pgbouncer切换到会话模式 - 我的网站将挂起。
我试过添加PDO :: ATTR_EMULATE_PREPARES => true - 我的网站也挂起。
我添加的BeginTransaction（）和commit（）围绕每个准备（）和execute（）调用 - 但后来我得到了很常出现以下错误：
SQLSTATE[25P02]: In failed sql transaction: 7 ERROR: current transaction is aborted, commands ignored until end of transaction block
下面是我的代码的摘录由于错误而失败 - 这非常简单，只需要调用5条SELECT语句：
function fetch_top() {
$table = '';
$top = '';
try {
# throw exception on any errors
$options = array(PDO::ATTR_ERRMODE => 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->beginTransaction();
$sth = $db->prepare("
select u.id,
u.first_name,
u.avatar,
u.female,
u.city,
m.money,
u.login > 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->execute();
$winner = $sth->fetch(PDO::FETCH_OBJ);
$db->commit();
$db->beginTransaction();
$sth = $db->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=?
');
$sth->execute(array($winner->id));
$winner_medals = $sth->fetchColumn();
$db->commit();
# current week leader
$db->beginTransaction();
$sth = $db->prepare("
select u.id,
u.first_name,
u.avatar,
u.female,
u.city,
m.money,
u.login > 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->execute();
$leader = $sth->fetch(PDO::FETCH_OBJ);
$db->commit();
$db->beginTransaction();
$sth = $db->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=?
');
$sth->execute(array($leader->id));
$leader_medals = $sth->fetchColumn();
$db->commit();
# fetch top players
$db->beginTransaction();
$sth = $db->prepare("
select u.id,
u.first_name,
u.female,
u.city,
m.money,
u.login > 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->execute();
$i = 0;
while ($player = $sth->fetch(PDO::FETCH_OBJ)) {
$top .= user_link($player) . ($i++ > 0 ? '' : ' »') . '<br />';
}
$db->commit();
# create the HTML table
$table = sprintf('.... skipped for brevity ....');
} catch (Exception $e) {
exit('Database problem: ' . $e->getMessage());
}
return $table;
}
请帮忙吗？ 亚历
你好，这正是我昨天所做的，似乎工作得很好（用PDO，但没有beginTransaction/commit） –