3.mysql数据库多实例应用

1.mysql多实例简介：
　　一台机器上开启多个不同的服务端口（eg:3306,3307），运行多个mysql服务进程，这些服务进程通过不同的socket监听不同的服务来提供各自的服务。
　　这些mysql多实例共用一套mysql安装程序，使用不同（也可相同）的my.cnf配置文件、启动程序、数据文件。在提供服务时，多实例mysql在逻辑上看来是各自独立的，多个实例的自身是根据配置文件对应的设定值，来取得服务器的相关硬件资源多少。
　　多实例补充：很多服务都可以有多实例，甚至在门户网站用的很广泛，例如：nginx,apache,haproxy,redis,memcache都可以多实例。

2.mysql多实例作用：
（1）有效利用服务器资源：当单个服务器资源有剩余时可以充分利用剩余的资源提供更多服务。（服务器的占用率应该达到60%~70%）
（2）节约服务器资源：当公司资金紧张，但是数据库又需要各自尽量独立提供服务，而且需要主从同步等技术时，多实例再好不过。

3.mysql多实例问题：
　　资源相互抢占问题：当某个服务实例并发很高或者有慢查询时，整个实例会消耗更多的内存、CPU、磁盘IO资源，导致服务器上的其他实例提供服务的质量下降。

4.mysql多实例应用场景：
（1）资金紧张型公司的选择；
（2）并发访问不是特别大的业务；
（3）门户网站应用mysql多实例场景。

5.mysql多实例配置方案：
（1）多配置文件部署方案：即通过配置多个配置文件及多个启动程序来实现多实例的方案。（推荐）
（2）单一配置文件部署方案（缺点是耦合性太高）。

6.安装多实例mysql数据库：
[root@oldboyedu-01 ~]# yum install ncurses-devel -y
[root@oldboyedu-01 ~]# yum install libaio-devel -y
[root@oldboyedu-01 ~]# pkill mysqld
[root@oldboyedu-01 ~]# ps -ef|grep mysqld
root 24312 21730 0 17:31 pts/2 00:00:00 grep mysqld
[root@oldboyedu-01 ~]# rm -rf /etc/init.d/mysqld
[root@oldboyedu-01 ~]# mkdir -p /data/{3306,3307}/data
[root@oldboyedu-01 ~]# tree /data/
/data/ //总的多实例根目录
├── 3306 //3306实例目录
│ └── data //3306实例的数据文件
├── 3307 //3307实例目录
│ └── data //3307实例的数据文件
└── lost+found
5 directories, 0 files
说明：
生产硬件配置：MEM，32g，双CPU 8核，磁盘6*600g SAS 15k，一般生产场景就2~3个实例。

[root@oldboyedu-01 opt]# unzip data.zip
Archive: data.zip
creating: data/
creating: data/3306/
inflating: data/3306/my.cnf
inflating: data/3306/mysql
creating: data/3307/
inflating: data/3307/my.cnf
inflating: data/3307/mysql

a.创建配置文件：
[root@oldboyedu-01 opt]# cp data/3306/my.cnf /data/3306/
[root@oldboyedu-01 opt]# cp data/3307/my.cnf /data/3307/
[root@oldboyedu-01 opt]# tree /data/
/data/
├── 3306
│ ├── data
│ └── my.cnf
└── 3307
├── data
└── my.cnf
4 directories, 2 files

多实例启动文件的启动mysql服务实质：
mysqld_safe --defaults-file=/data/3306/my.cnf 2>&1 >/dev/null &
mysqld_safe --defaults-file=/data/3307/my.cnf 2>&1 >/dev/null &
多实例启动文件的（平滑）停止mysql服务实质（安全起见这里需要密码！）：
mysqladmin -u root -poldboy123 -S /data/3306/mysql.sock shutdown
mysqladmin -u root -poldboy123 -S /data/3307/mysql.sock shutdown

b.创建启动文件：
[root@oldboyedu-01 opt]# cp data/3306/mysql /data/3306/
[root@oldboyedu-01 opt]# cp data/3307/mysql /data/3307/
[root@oldboyedu-01 opt]# tree /data/
/data/
├── 3306
│   ├── data
│   ├── my.cnf
│   └── mysql
└── 3307
├── data
├── my.cnf
└── mysql
4 directories, 4 files

//或者直接：
[root@oldboyedu-01 /]# unzip -o data.zip
Archive: data.zip
creating: data/
creating: data/3306/
inflating: data/3306/my.cnf
inflating: data/3306/mysql
creating: data/3307/
inflating: data/3307/my.cnf
inflating: data/3307/mysql
[root@oldboyedu-01 /]# cd
[root@oldboyedu-01 ~]# tree /data
/data
├── 3306
│ ├── data //空建
│ ├── my.cnf
│ └── mysql
└── 3307
├── data //空建
├── my.cnf
└── mysql
4 directories, 4 files
------------------------------

#my.cnf
[client]
port = 3306
socket = /data/3306/mysql.sock

[mysql]
no-auto-rehash

[mysqld]
user = mysql
port = 3306
socket = /data/3306/mysql.sock
basedir = /application/mysql
datadir = /data/3306/data
open_files_limit = 1024
back_log = 600
max_connections = 800
max_connect_errors = 3000
table_cache = 614
external-locking = FALSE
max_allowed_packet =8M
sort_buffer_size = 1M
join_buffer_size = 1M
thread_cache_size = 100
thread_concurrency = 2
query_cache_size = 2M
query_cache_limit = 1M
query_cache_min_res_unit = 2k
#default_table_type = InnoDB
thread_stack = 192K
#transaction_isolation = READ-COMMITTED
tmp_table_size = 2M
max_heap_table_size = 2M
long_query_time = 1
#log_long_format
#log-error = /data/3306/error.log
#log-slow-queries = /data/3306/slow.log
pid-file = /data/3306/mysql.pid
log-bin = /data/3306/mysql-bin
relay-log = /data/3306/relay-bin
relay-log-info-file = /data/3306/relay-log.info
binlog_cache_size = 1M
max_binlog_cache_size = 1M
max_binlog_size = 2M
expire_logs_days = 7
key_buffer_size = 16M
read_buffer_size = 1M
read_rnd_buffer_size = 1M
bulk_insert_buffer_size = 1M
#myisam_sort_buffer_size = 1M
#myisam_max_sort_file_size = 10G
#myisam_max_extra_sort_file_size = 10G
#myisam_repair_threads = 1
#myisam_recover

lower_case_table_names = 1
skip-name-resolve
slave-skip-errors = 1032,1062
replicate-ignore-db=mysql

server-id = 1

innodb_additional_mem_pool_size = 4M
innodb_buffer_pool_size = 32M
innodb_data_file_path = ibdata1:128M:autoextend
innodb_file_io_threads = 4
innodb_thread_concurrency = 8
innodb_flush_log_at_trx_commit = 2
innodb_log_buffer_size = 2M
innodb_log_file_size = 4M
innodb_log_files_in_group = 3
innodb_max_dirty_pages_pct = 90
innodb_lock_wait_timeout = 120
innodb_file_per_table = 0
[mysqldump]
quick
max_allowed_packet = 2M

[mysqld_safe]
log-error=/data/3306/mysql_oldboy3306.err
pid-file=/data/3306/mysqld.pid

#mysql
#init
port=3306
mysql_user="root"
mysql_pwd="oldboy"
CmdPath="/application/mysql/bin"
mysql_sock="/data/${port}/mysql.sock"
#startup function
function_start_mysql()
{
if [ ! -e "$mysql_sock" ];then
printf "Starting MySQL...\n"
/bin/sh ${CmdPath}/mysqld_safe --defaults-file=/data/${port}/my.cnf 2>&1 > /dev/null &
else
printf "MySQL is running...\n"
exit
fi
}

#stop function
function_stop_mysql()
{
if [ ! -e "$mysql_sock" ];then
printf "MySQL is stopped...\n"
exit
else
printf "Stoping MySQL...\n"
${CmdPath}/mysqladmin -u ${mysql_user} -p${mysql_pwd} -S /data/${port}/mysql.sock shutdown
fi
}

#restart function
function_restart_mysql()
{
printf "Restarting MySQL...\n"
function_stop_mysql
sleep 2
function_start_mysql
}

case $1 in
start)
function_start_mysql
;;
stop)
function_stop_mysql
;;
restart)
function_restart_mysql
;;
*)
printf "Usage: /data/${port}/mysql {start|stop|restart}\n"
esac

#my.cnf
[client]
port = 3307
socket = /data/3307/mysql.sock

[mysql]
no-auto-rehash

[mysqld]
user = mysql
port = 3307
socket = /data/3307/mysql.sock
basedir = /application/mysql
datadir = /data/3307/data
open_files_limit = 1024
back_log = 600
max_connections = 800
max_connect_errors = 3000
table_cache = 614
external-locking = FALSE
max_allowed_packet =8M
sort_buffer_size = 1M
join_buffer_size = 1M
thread_cache_size = 100
thread_concurrency = 2
query_cache_size = 2M
query_cache_limit = 1M
query_cache_min_res_unit = 2k
#default_table_type = InnoDB
thread_stack = 192K
#transaction_isolation = READ-COMMITTED
tmp_table_size = 2M
max_heap_table_size = 2M
#long_query_time = 1
#log_long_format
#log-error = /data/3307/error.log
#log-slow-queries = /data/3307/slow.log
pid-file = /data/3307/mysql.pid
#log-bin = /data/3307/mysql-bin
relay-log = /data/3307/relay-bin
relay-log-info-file = /data/3307/relay-log.info
binlog_cache_size = 1M
max_binlog_cache_size = 1M
max_binlog_size = 2M
expire_logs_days = 7
key_buffer_size = 16M
read_buffer_size = 1M
read_rnd_buffer_size = 1M
bulk_insert_buffer_size = 1M
#myisam_sort_buffer_size = 1M
#myisam_max_sort_file_size = 10G
#myisam_max_extra_sort_file_size = 10G
#myisam_repair_threads = 1
#myisam_recover

lower_case_table_names = 1
skip-name-resolve
slave-skip-errors = 1032,1062
replicate-ignore-db=mysql

server-id = 3

innodb_additional_mem_pool_size = 4M
innodb_buffer_pool_size = 32M
innodb_data_file_path = ibdata1:128M:autoextend
innodb_file_io_threads = 4
innodb_thread_concurrency = 8
innodb_flush_log_at_trx_commit = 2
innodb_log_buffer_size = 2M
innodb_log_file_size = 4M
innodb_log_files_in_group = 3
innodb_max_dirty_pages_pct = 90
innodb_lock_wait_timeout = 120
innodb_file_per_table = 0
[mysqldump]
quick
max_allowed_packet = 2M

[mysqld_safe]
log-error=/data/3307/mysql_oldboy3307.err
pid-file=/data/3307/mysqld.pid

#mysql
#init
port=3307
mysql_user="root"
mysql_pwd="oldboy"
CmdPath="/application/mysql/bin"
mysql_sock="/data/${port}/mysql.sock"
#startup function
function_start_mysql()
{
if [ ! -e "$mysql_sock" ];then
printf "Starting MySQL...\n"
/bin/sh ${CmdPath}/mysqld_safe --defaults-file=/data/${port}/my.cnf 2>&1 > /dev/null &
else
printf "MySQL is running...\n"
exit
fi
}

#stop function
function_stop_mysql()
{
if [ ! -e "$mysql_sock" ];then
printf "MySQL is stopped...\n"
exit
else
printf "Stoping MySQL...\n"
${CmdPath}/mysqladmin -u ${mysql_user} -p${mysql_pwd} -S /data/${port}/mysql.sock shutdown
fi
}

#restart function
function_restart_mysql()
{
printf "Restarting MySQL...\n"
function_stop_mysql
sleep 2
function_start_mysql
}

case $1 in
start)
function_start_mysql
;;
stop)
function_stop_mysql
;;
restart)
function_restart_mysql
;;
*)
printf "Usage: /data/${port}/mysql {start|stop|restart}\n"
esac

----------------------------------

7.授权mysql多实例服务所有启动文件mysql可执行
[root@oldboyedu-01 ~]# chown -R mysql.mysql /data
[root@oldboyedu-01 ~]# find /data -type f -name "mysql"|xargs ls -l
-rw-r--r-- 1 mysql mysql 1307 Jul 15 2013 /data/3306/mysql
-rw-r--r-- 1 mysql mysql 1307 Jul 21 2013 /data/3307/mysql
[root@oldboyedu-01 ~]# find /data -type f -name "mysql"|xargs chmod +x
[root@oldboyedu-01 ~]# find /data -type f -name "mysql"|xargs ls -l
-rwxr-xr-x 1 mysql mysql 1307 Jul 15 2013 /data/3306/mysql
-rwxr-xr-x 1 mysql mysql 1307 Jul 21 2013 /data/3307/mysql

[root@oldboyedu-01 opt]# grep "mysql" /etc/profile
export PATH=/application/mysql/bin:$PATH

8.初始化mysql多实例的数据库文件：
[root@oldboyedu-01 scripts]# ./mysql_install_db --basedir=/application/mysql --datadir=/data/3306/data --user=mysql
[root@oldboyedu-01 scripts]# ./mysql_install_db --basedir=/application/mysql --datadir=/data/3307/data --user=mysql
......
Installing MySQL system tables...
OK
Filling help tables...
OK

为何要初始化数据库：
（1）主要目的是创建基础的数据库文件，eg:生成mysql库，表等。
（2）初始化后查看对应实例数据目录：
[root@oldboyedu-01 ~]# tree /data/3306/data/
/data/3306/data/
├── mysql
│ ├── columns_priv.frm
│ ├── columns_priv.MYD
│ ├── columns_priv.MYI
│ ├── db.frm
......

[root@oldboyedu-01 ~]# tree /data/3307/data/
/data/3307/data/
├── ibdata1
├── ib_logfile0
├── ib_logfile1
├── ib_logfile2
├── mysql
│ ├── columns_priv.frm
......

9.启动mysql
[root@oldboyedu-01 ~]# /data/3306/mysql start
Starting MySQL...
[root@oldboyedu-01 ~]# /data/3307/mysql start
Starting MySQL...

[root@oldboyedu-01 ~]# netstat -lntup |grep 330 //查看启动与否
tcp 0 0 0.0.0.0:3306 0.0.0.0:* LISTEN 27896/mysqld
tcp 0 0 0.0.0.0:3307 0.0.0.0:* LISTEN 28609/mysqld

mysql故障排错多实例数据库：
若mysql服务没有起来，排查方法如下：
（1）如果发现没有显示mysql的端口，请稍微等待看看，mysql服务启动略微慢；
（2）如果还不行，查看日志：
[root@oldboyedu-01 ~]# tail /data/3306/mysql_oldboy3306.err //查看错误日志
171212 13:52:02 InnoDB: 5.5.32 started; log sequence number 0
171212 13:52:02 [Note] Server hostname (bind-address): '0.0.0.0'; port: 3306
171212 13:52:02 [Note] - '0.0.0.0' resolves to '0.0.0.0';
171212 13:52:02 [Note] Server socket created on IP: '0.0.0.0'.
171212 13:52:02 [Warning] 'user' entry 'root@oldboyedu-01' ignored in --skip-name-resolve mode.
171212 13:52:02 [Warning] 'user' entry '@oldboyedu-01' ignored in --skip-name-resolve mode.
171212 13:52:02 [Warning] 'proxies_priv' entry '@ root@oldboyedu-01' ignored in --skip-name-resolve mode.
171212 13:52:02 [Note] Event Scheduler: Loaded 0 events
171212 13:52:02 [Note] /application/mysql-5.5.32/bin/mysqld: ready for connections.
Version: '5.5.32-log' socket: '/data/3306/mysql.sock' port: 3306 Source distribution
（3）细看所有执行命令返回的屏幕输出，不要忽略关键的输出内容；
（4）查看系统的/var/log/messages；
（5）如果是关联服务，要同时查看相关服务的log.

10.mysql多实例的登录
说明：登录不同实例库需要指定不同库的sock路径，这是在my.cnf里指定。默认root无密码。
[root@oldboyedu-01 ~]# mysql -S /data/3306/mysql.sock //登录3306
......
mysql>
mysql> create database d3306;
Query OK, 1 row affected (0.03 sec)

mysql> quit
Bye

mysql> create database d3307;
Query OK, 1 row affected (0.00 sec)

mysql> system ls
anaconda-ks.cfg error.txt ett.txt install.log install.log.syslog right_error.txt right.txt
mysql> system mysql -S /data/3306/mysql.sock //从3307登录到3306
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.5.32-log Source distribution

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

11.mysql多实例的关闭服务
[root@oldboyedu-01 ~]# /data/3306/mysql stop //比如3306
[root@oldboyedu-01 ~]# /data/3306/mysql start

[root@oldboyedu-01 ~]# /data/3306/mysql stop //老师的坑！
Stoping MySQL...
/application/mysql/bin/mysqladmin: connect to server at 'localhost' failed
error: 'Access denied for user 'root'@'localhost' (using password: YES)'
[root@oldboyedu-01 ~]# cat /data/3306/mysql |grep mysql_pwd
mysql_pwd="oldboy" //这里改成免密的mysql_pwd=""
[root@oldboyedu-01 ~]# /data/3306/mysql stop //3306可以关闭了
Stoping MySQL...
Enter password:
[root@oldboyedu-01 ~]# netstat -lntup |grep 330
tcp 0 0 0.0.0.0:3307 0.0.0.0:* LISTEN 28609/mysqld

12.初次设置密码为：oldboy123
[root@oldboyedu-01 ~]# /data/3306/mysql start
[root@oldboyedu-01 ~]# netstat -lntup |grep 330
tcp 0 0 0.0.0.0:3306 0.0.0.0:* LISTEN 29429/mysqld
tcp 0 0 0.0.0.0:3307 0.0.0.0:* LISTEN 28609/mysqld
[root@oldboyedu-01 ~]# mysqladmin -u root -S /data/3306/mysql.sock password 'oldboy123' //3306

[root@oldboyedu-01 ~]# /data/3307/mysql start
MySQL is running...
[root@oldboyedu-01 ~]# mysqladmin -u root -S /data/3307/mysql.sock password 'oldboy123' //3307

[root@oldboyedu-01 ~]# /data/3307/mysql stop
Stoping MySQL...
/application/mysql/bin/mysqladmin: connect to server at 'localhost' failed
error: 'Access denied for user 'root'@'localhost' (using password: YES)'
[root@oldboyedu-01 ~]# vim /data/3307/mysql
说明：
将密码mysql_pwd=""改成mysql_pwd="oldboy123"才可以stop
[root@oldboyedu-01 ~]# /data/3307/mysql stop
Stoping MySQL...

[root@oldboyedu-01 ~]# vim /data/3306/mysql
说明：
将密码mysql_pwd=""改成mysql_pwd="oldboy123"才可以stop
[root@oldboyedu-01 ~]# /data/3306/mysql stop
MySQL is stopped...
[root@oldboyedu-01 ~]# netstat -lntup |grep 330 //检查，成功关闭3306、3307服务
[root@oldboyedu-01 ~]#

安全起见则授权：
[root@oldboyedu-01 ~]# find /data -type f -name "mysql" -exec chmod 700 {} \;
[root@oldboyedu-01 ~]# find /data -type f -name "mysql" -exec chown root.root {} \;
[root@oldboyedu-01 ~]# find /data -type f -name "mysql" -exec ls -l {} \;
-rwx------ 1 root root 1310 Dec 12 14:52 /data/3306/mysql
-rwx------ 1 root root 1310 Dec 12 14:46 /data/3307/mysql

13.mysql多实例的重新启动
[root@oldboyedu-01 ~]# /data/3306/mysql start
Starting MySQL...
[root@oldboyedu-01 ~]# /data/3307/mysql start
Starting MySQL...
[root@oldboyedu-01 ~]# netstat -lntup |grep 330
tcp 0 0 0.0.0.0:3306 0.0.0.0:* LISTEN 30256/mysqld
tcp 0 0 0.0.0.0:3307 0.0.0.0:* LISTEN 30973/mysqld
[root@oldboyedu-01 ~]# ss -lntup |grep 330
tcp LISTEN 0 128 *:3306 *:* users:(("mysqld",30256,12))
tcp LISTEN 0 128 *:3307 *:* users:(("mysqld",30973,11))

[root@oldboyedu-01 ~]# netstat -lntup |grep 330
tcp 0 0 0.0.0.0:3306 0.0.0.0:* LISTEN 30256/mysqld
tcp 0 0 0.0.0.0:3307 0.0.0.0:* LISTEN 30973/mysqld
[root@oldboyedu-01 ~]# /data/3306/mysql stop
Stoping MySQL...
[root@oldboyedu-01 ~]# /data/3307/mysql stop
Stoping MySQL...
[root@oldboyedu-01 ~]# netstat -lntup |grep 330
[root@oldboyedu-01 ~]# /data/3306/mysql start //启动3306
Starting MySQL...
[root@oldboyedu-01 ~]# /data/3307/mysql start //启动3307
Starting MySQL...

[root@oldboyedu-01 ~]# netstat -lntup |grep 330
tcp 0 0 0.0.0.0:3306 0.0.0.0:* LISTEN 32481/mysqld
tcp 0 0 0.0.0.0:3307 0.0.0.0:* LISTEN 31740/mysqld
[root@oldboyedu-01 ~]# mysql -uroot -poldboy123 -S /data/3306/mysql.sock //加密码登录3306测试！
......
mysql>
[root@oldboyedu-01 ~]# mysql -uroot -poldboy123 -h localhost -S /data/3306/mysql.sock //指定本机登录

增加mysql数据库第三个实例：
建立：
[root@oldboyedu-01 ~]# mkdir -p /data/3308/data
[root@oldboyedu-01 ~]# cp /data/3306/my.cnf /data/3308/
[root@oldboyedu-01 ~]# cp /data/3306/mysql /data/3308/
授权：
[root@oldboyedu-01 ~]# chown -R mysql.mysql /data/3308/
[root@oldboyedu-01 ~]# cd /data/3308
[root@oldboyedu-01 3308]# vim my.cnf
server-id = 4
:g/3306/s//3308/g 或者:%s/3306/3308/g
[root@oldboyedu-01 3308]# vim mysql
%s/3306/3308/g
[root@oldboyedu-01 scripts]# pwd
/application/mysql/scripts
初始化：
[root@oldboyedu-01 scripts]# ./mysql_install_db --user=mysql --basedir=/application/mysql --datadir=/data/3308/data/
Installing MySQL system tables...
OK
Filling help tables...
OK
启动mysql数据库的3308实例：
[root@oldboyedu-01 ~]# /data/3308/mysql start
Starting MySQL...
[root@oldboyedu-01 ~]# netstat -lntup|grep 330
tcp 0 0 0.0.0.0:3306 0.0.0.0:* LISTEN 32481/mysqld
tcp 0 0 0.0.0.0:3307 0.0.0.0:* LISTEN 31740/mysqld
tcp 0 0 0.0.0.0:3308 0.0.0.0:* LISTEN 33299/mysqld
初始设置密码：
[root@oldboyedu-01 ~]# mysqladmin -u root -S /data/3308/mysql.sock password 'oldboy123'
重新登录3308：
[root@oldboyedu-01 ~]# mysql -uroot -poldboy123 -S /data/3308/mysql.sock
......
mysql>
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| test |
+--------------------+
4 rows in set (0.00 sec)
mysql> quit
Bye

小结：
（1）以上是本地连接mysql数据库，多实例本地端登录是通过socket文件来指定具体登录到哪个实例。此文件具体位置是在mysql初始化（mysql_install_db）时指定的，在本机登录时登录程序通过socket文件来判断登录的数据库实例。
mysql.sock <== 文件是服务器与本地客户端进行通信的UNIX套接字文件
eg:mysql -uroot -poldboy123 -S /data/3308/mysql.sock
（2）远端登录是指定多实例主机中的其中一个实例，TCP/UDP端口（port）来指定所要登陆的mysql数据库，此端口是在mysql配置文件my.cnf中指定的。
端口port <==端口是一种“逻辑连接位置”，客户端程序被分派计算机上特殊程序的一种方式。
eg:[root@oldboyedu-01 ~]# mysql -uremote -p'hzcai123' -h 192.168.128.138 -P 3307
ERROR 2003 (HY000): Can't connect to MySQL server on '192.168.128.138' (111)

//远程登录别人主机：
[root@oldboyedu-01 ~]# ssh 10.0.0.94
ssh: connect to host 10.0.0.94 port 22: No route to host
[root@oldboyedu-01 ~]# 123456

posted @ 2017-12-13 17:42 bkycrmn 阅读(251) 评论(0) 收藏举报

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3.mysql数据库多实例应用

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