php, mysql - Too many connections to database error -


good day all. have odd error. have created chat works this:

  • questions/answers inserted db
  • every 2 seconds ajax request sent php script fetch new questions/answers

it worked fine until today when got error:

uncaught exception 'pdoexception' message 'sqlstate[hy000] [1040] many connections' in /var/www/html/dbdev/include/zend/db/adapter/pdo/abstract.php:129  stack trace: #0 /var/www/html/dbdev/include/zend/db/adapter/pdo/abstract.php(129): pdo->__construct('mysql:host=loca...', '', '', array)  s#1 /var/www/html/dbdev/include/zend/db/adapter/pdo/mysql.php(96): zend_db_adapter_pdo_abstract->_connect()  s#2 /var/www/html/dbdev/include/zend/db/adapter/abstract.php(448): zend_db_adapter_pdo_mysql->_connect()  s#3 /var/www/html/dbdev/include/zend/db/adapter/pdo/abstract.php(238): zend_db_adapter_abstract->query('select profile_...', array)  s#4 /var/www/html/dbdev/include/zend/db/adapter/abstract.php(782): zend_db_adapter_pdo_abstract->query('select profile_...', array)  s#5 /var/www/html/dbdev/include/profile.php(43): zend_db_adapter_abstract->fetchpairs('select profile_...')  s#6 /var/www/html/dbdev/public_html/index.php(29): profile->load()  s#7 {main} next exception 'zend_db_adapter_exception' in /var/www/html/dbdev/include/zend/db/adapter/pdo/abstract.php on line 144

the problem not many... (8) , don't think db not support more 8 16 connections simultaneously (on specifications written chat must support 50-100 users 8 is... small).

so... can any1 tell me why did happen (yesterday 15 , worked fine) , how solve it? thank help. if need code samples ask.

there bunch of different reasons "too many connections" error.

check out faq page on mysql.com: http://dev.mysql.com/doc/refman/5.5/en/too-many-connections.html

check my.cnf file "max_connections". if none exist try:

[mysqld] set-variable=max_connections=250

however default 151, should okay.

if on shared host, might other users taking many connections.

other problems out use of persistent connections , running out of diskspace.


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