Too many connections

FILE: /data/www/wenku/mtceo/Lib/Core/Db.class.php 　LINE: 162

[26-06-17 23:34:06] /data/www/wenku/mtceo/Lib/Core/Db.class.php (162) DbMysql->connect()
[26-06-17 23:34:06] /data/www/wenku/mtceo/Lib/Driver/Db/DbMysql.class.php (94) Db->initConnect()
[26-06-17 23:34:06] /data/www/wenku/mtceo/Lib/Driver/Db/DbMysql.class.php (213) DbMysql->query(SHOW COLUMNS FROM `sq_doc_cate`)
[26-06-17 23:34:06] /data/www/wenku/mtceo/Lib/Core/Model.class.php (135) DbMysql->getFields(sq_doc_cate)
[26-06-17 23:34:06] /data/www/wenku/mtceo/Lib/Core/Model.class.php (123) Model->flush()
[26-06-17 23:34:06] /data/www/wenku/mtceo/Lib/Core/Model.class.php (1174) Model->_checkTableInfo()
[26-06-17 23:34:06] /data/www/wenku/mtceo/Lib/Core/Model.class.php (98) Model->db(0, )
[26-06-17 23:34:06] /data/www/wenku/mtceo/Common/common.php (270) Model->__construct()
[26-06-17 23:34:06] /data/www/wenku/app/Lib/Action/frontendAction.class.php (49) D(doc_cate)
[26-06-17 23:34:06] /data/www/wenku/app/Lib/Action/docbaseAction.class.php (10) frontendAction->_initialize()
[26-06-17 23:34:06] /data/www/wenku/app/Lib/Action/home/docAction.class.php (6) docbaseAction->_initialize()
[26-06-17 23:34:06] /data/www/wenku/mtceo/Lib/Core/Action.class.php (57) docAction->_initialize()
[26-06-17 23:34:06] /data/www/wenku/mtceo/Common/common.php (321) Action->__construct()
[26-06-17 23:34:06] /data/www/wenku/mtceo/Lib/Core/App.class.php (103) A(home/doc)
[26-06-17 23:34:06] /data/www/wenku/mtceo/Lib/Core/App.class.php (207) App::exec()
[26-06-17 23:34:06] /data/www/wenku/mtceo/Lib/Core/Think.class.php (39) App::run()
[26-06-17 23:34:06] /data/www/wenku/mtceo/Common/runtime.php (241) Think::start()
[26-06-17 23:34:06] /data/www/wenku/mtceo/mtceo.php (30) require(/data/www/wenku/mtceo/Common/runtime.php)
[26-06-17 23:34:06] /data/www/wenku/index.php (22) require(/data/www/wenku/mtceo/mtceo.php)