错误：无法连接到'SERVER_IP'上的MySQL服务器（99）

问题描述：

我正在使用PHP5和MySQL，一切都很好，直到超过9,000个请求被发送到MySQL服务器。错误：无法连接到'SERVER_IP'上的MySQL服务器（99）

例如，我试图从一个具有10,000条记录（行）的CSV文件中进行10,000次插入。当循环运行的我得到这个错误：

Can't connect to MySQL server on '192.168.10.11' (99).

我写了一个小圈做万select field_id from table where field_id = XX，我得到了同样的错误。

我的灯用Debian的挤压，PHP5，MySQL服务器5.1，Apache2的

的重要说明：使用MySQL工作台或MySQL CLI没有错误，只是在网络环境。

这是my.conf

# 
# The MySQL database server configuration file. 
# 
# You can copy this to one of: 
# - "/etc/mysql/my.cnf" to set global options, 
# - "~/.my.cnf" to set user-specific options. 
# 
# One can use all long options that the program supports. 
# Run program with --help to get a list of available options and with 
# --print-defaults to see which it would actually understand and use. 
# 
# For explanations see 
# http://dev.mysql.com/doc/mysql/en/server-system-variables.html 

# This will be passed to all mysql clients 
# It has been reported that passwords should be enclosed with ticks/quotes 
# escpecially if they contain "#" chars... 
# Remember to edit /etc/mysql/debian.cnf when changing the socket location. 
[client] 
port  = 3306 
socket  = /var/run/mysqld/mysqld.sock 

# Here is entries for some specific programs 
# The following values assume you have at least 32M ram 

# This was formally known as [safe_mysqld]. Both versions are currently parsed. 
[mysqld_safe] 
socket  = /var/run/mysqld/mysqld.sock 
nice  = 0 

[mysqld] 
# 
# * Basic Settings 
# 
user  = mysql 
pid-file = /var/run/mysqld/mysqld.pid 
socket  = /var/run/mysqld/mysqld.sock 
port  = 3306 
basedir  = /usr 
datadir  = /var/lib/mysql 
tmpdir  = /tmp 
language = /usr/share/mysql/english 
skip-external-locking 
skip-name-resolve 

wait_timeout=60 
connect_timeout=10 
max_allowed_packet=16M 
interactive_timeout=120 
join_buffer_size=1M 
query_cache_size=128M 
query_cache_limit=2M 
table_cache=1024 
sort_buffer_size=8M 
read_buffer_size=2M 
read_rnd_buffer_size=4M 
key_buffer = 256M 
key_buffer_size=64M 

# 
# Instead of skip-networking the default is now to listen only on 
# localhost which is more compatible and is not less secure. 
#bind-address  = 127.0.0.1 
# 
# * Fine Tuning 
# 
#key_buffer  = 16M 
#max_allowed_packet = 16M 
thread_stack  = 192K 
thread_cache_size  = 8 
# This replaces the startup script and checks MyISAM tables if needed 
# the first time they are touched 
myisam-recover   = BACKUP 
#max_connections  = 100 
#table_cache   = 64 
#thread_concurrency  = 10 
# 
# * Query Cache Configuration 
# 
#query_cache_limit = 1M 
#query_cache_size  = 16M 
# 
# * Logging and Replication 
# 
# Both location gets rotated by the cronjob. 
# Be aware that this log type is a performance killer. 
# As of 5.1 you can enable the log at runtime! 
#general_log_file  = /var/log/mysql/mysql.log 
#general_log    = 1 
# 
# Error logging goes to syslog due to /etc/mysql/conf.d/mysqld_safe_syslog.cnf. 
# 
# Here you can see queries with especially long duration 
#log_slow_queries = /var/log/mysql/mysql-slow.log 
#long_query_time = 2 
#log-queries-not-using-indexes 
# 
# The following can be used as easy to replay backup logs or for replication. 
# note: if you are setting up a replication slave, see README.Debian about 
#  other settings you may need to change. 
#server-id  = 1 
#log_bin   = /var/log/mysql/mysql-bin.log 
expire_logs_days = 10 
max_binlog_size   = 100M 
#binlog_do_db  = include_database_name 
#binlog_ignore_db = include_database_name 
# 
# * InnoDB 
# 
# InnoDB is enabled by default with a 10MB datafile in /var/lib/mysql/. 
# Read the manual for more InnoDB related options. There are many! 
# 
# * Security Features 
# 
# Read the manual, too, if you want chroot! 
# chroot = /var/lib/mysql/ 
# 
# For generating SSL certificates I recommend the OpenSSL GUI "tinyca". 
# 
# ssl-ca=/etc/mysql/cacert.pem 
# ssl-cert=/etc/mysql/server-cert.pem 
# ssl-key=/etc/mysql/server-key.pem 

innodb_buffer_pool_size=1024M 

[mysqldump] 
quick 
quote-names 
max_allowed_packet = 16M 

[mysql] 
#no-auto-rehash # faster start of mysql but no tab completition 

[isamchk] 
key_buffer  = 16M 

# 
# * IMPORTANT: Additional settings that can override those from this file! 
# The files must end with '.cnf', otherwise they'll be ignored. 
# 
!includedir /etc/mysql/conf.d/

答

您正在运行到超时问题和太多的连接。尝试降低您的wait_timeout，也许是interactive_timeout。

我不知道你是否正在使用PDO（从我在这里看到的所有帖子推荐），但尝试使MySQL连接是一个持久化的连接，以便它不必保持打开新的连接每次更新。

非常感谢，持续的连接工作！现在我正在阅读有关PDO，它似乎是最好的选择！ –

我很高兴。不要忘记接受答案。 – aynber

答

这几个MariaDB的安装工作对我来说：

第1步 - 编辑的sysctl：

sudo vim /etc/sysctl.conf

第2步 - 粘贴这些行：

net.ipv4.tcp_tw_reuse=1 net.ipv4.tcp_tw_recycle=1 net.ipv4.tcp_fin_timeout=30 net.ipv4.tcp_max_syn_backlog=8192

基本上这将保持连接长时间打开

第3步：应用设置

sudo sysctl -p

这应该可以解决这个问题。

错误：无法连接到'SERVER_IP'上的MySQL服务器（99）

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