MHA-ATLAS-MySQL高可用2
内容导读
互联网集市收集整理的这篇技术教程文章主要介绍了MHA-ATLAS-MySQL高可用2，小编现在分享给大家，供广大互联网技能从业者学习和参考。文章包含20486字，纯文字阅读大概需要30分钟。
内容图文
（2）修改mha配置文件
[root@mysql-db03 scripts]# vim /etc/mha/mha1.cnf
[root@mysql-db03 scripts]# cat /etc/mha/mha1.cnf
[server default]
manager_log=/var/log/mha/mha1/manager
manager_workdir=/var/log/mha/mha1
master_binlog_dir=/usr/local/mysql/data
master_ip_failover_script=/usr/local/bin/master_ip_failover #添加脚本位置
password=123123
ping_interval=2
repl_password=123123
repl_user=rep
ssh_user=root
user=mha
#candidate_master=1 #留着备用的注释项
#check_repl_delay=0 #留着备用的注释项
[server1]
hostname=192.168.0.51
port=3306
[server2]
hostname=192.168.0.52
port=3306
[server3]
hostname=192.168.0.53
port=3306
（3）修改源程序自带VIP漂移脚本
#在下边的脚本里添加如下4行代码：
[root@mysql-db03 scripts]# sed -n ‘34,37p‘ /usr/local/bin/master_ip_failover
my $vip = ‘192.168.0.60/24‘; #定义VIP
my $key = ‘0‘; #定义网卡后缀数值，如果eth0就是0，eth1就是1
my $ssh_start_vip = "/sbin/ifconfig eth0:$key $vip"; #绑定VIP的命令
my $ssh_stop_vip = "/sbin/ifconfig eth0:$key down"; #关闭VIP的命令特别提示：
由于自带的模板脚本特别的坑，需要修改的地方太多，因此，同学们可以直接拷贝脚本文件放到/usr/local/bin目录下，并赋予x权限。
修改后的master_ip_failover脚本的内容如下：
[root@mysql-db03 ~]# cat /usr/local/bin/master_ip_failover
#!/usr/bin/env perl
use strict;
use warnings FATAL => ‘all‘;
use Getopt::Long;
my (
$command, $ssh_user, $orig_master_host,
$orig_master_ip, $orig_master_port, $new_master_host,
$new_master_ip, $new_master_port
);
my $vip = ‘192.168.0.60/24‘;
my $key = ‘0‘;
my $ssh_start_vip = "/sbin/ifconfig eth0:$key $vip";
my $ssh_stop_vip = "/sbin/ifconfig eth0:$key down";
GetOptions(
‘command=s‘ => \$command,
‘ssh_user=s‘ => \$ssh_user,
‘orig_master_host=s‘ => \$orig_master_host,
‘orig_master_ip=s‘ => \$orig_master_ip,
‘orig_master_port=i‘ => \$orig_master_port,
‘new_master_host=s‘ => \$new_master_host,
‘new_master_ip=s‘ => \$new_master_ip,
‘new_master_port=i‘ => \$new_master_port,
);
exit &main();
sub main {
if ( $command eq "stop" || $command eq "stopssh" ) {
my $exit_code = 1;
eval {
print "Disabling the VIP on old master:$orig_master_host \n";
&stop_vip();
$exit_code = 0;
};
if ($@) {
warn "Got Error: $@\n";
exit $exit_code;
}
exit $exit_code;
}
elsif ( $command eq "start" ) {
my $exit_code = 10;
eval {
print "Enabling the VIP - $vip on the new master - $new_master_host \n";
&start_vip();
$exit_code = 0;
};
if ($@) {
warn $@;
exit $exit_code;
}
exit $exit_code;
}
elsif ( $command eq "status" ) {
print "Checking the Status of the script..OK \n";
`ssh $ssh_user\@$orig_master_host \" $ssh_start_vip \"`;
exit 0;
}
else {
&usage();
exit 1;
}
}
sub start_vip() {
`ssh $ssh_user\@$new_master_host \" $ssh_start_vip \"`;
}
sub stop_vip() {
`ssh $ssh_user\@$orig_master_host \" $ssh_stop_vip \"`;
}
sub usage {
print
"Usage: master_ip_failover --command=start|stop|stopssh|status --orig_master_host=host --orig_master_ip=ip --orig_master_port=port --new_master_host=host --new_master_ip=ip --new_master_port=port\n";
}（4）重启动mha管理端
[root@mysql-db03 ~]# ps -ef | grep mha | grep -v grep #查看mha进程
root 14138 13211 0 19:22 pts/3 00:00:00 perl /usr/bin/masterha_manager --conf=/etc/mha/mha1.cnf --remove_dead_master_conf --ignore_last_failover
[root@mysql-db03 ~]# pkill perl #杀掉perl进程
[1]+ Exit 1 nohup masterha_manager --conf=/etc/mha/mha1.cnf --remove_dead_master_conf --ignore_last_failover < /dev/null > /var/log/mha/mha1/manager.log 2>&1
[root@mysql-db03 ~]# ps -ef | grep mha | grep -v grep #查看mha进程
[root@mysql-db03 ~]# nohup masterha_manager --conf=/etc/mha/mha1.cnf --remove_dead_master_conf --ignore_last_failover < /dev/null > #启动mha进程 /var/log/mha/mha1/manager.log 2>&1 &提示：
如果启动mha进程失败，需要进行mha的连接检测masterha_check_ssh --conf=/etc/mha/mha1.cnfssh连接检测masterha_check_repl --conf=/etc/mha/mha1.cnf主从复制检测
6.3 VIP漂移脚本验证测试。
架构初始状态：
（1）查看mysql-db01网络状态
（2）停掉mysql-db01的MySQL数据库服务
[root@mysql-db01 ~]# /etc/init.d/mysqld stop
Shutting down MySQL..... SUCCESS!
[root@mysql-db01 ~]# ifconfig #VIP消失了
eth0 Link encap:Ethernet HWaddr 00:0C:29:59:7C:EF
inet addr:192.168.0.51 Bcast:192.168.0.255 Mask:255.255.255.0
inet6 addr: fe80::20c:29ff:fe59:7cef/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:316130 errors:0 dropped:0 overruns:0 frame:0
TX packets:58058 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:363635227 (346.7 MiB) TX bytes:6462008 (6.1 MiB)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:69 errors:0 dropped:0 overruns:0 frame:0
TX packets:69 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:9752 (9.5 KiB) TX bytes:9752 (9.5 KiB)（3）查看mysql-db02
[root@mysql-db02 ~]# ifconfig #VIP出现了
eth0 Link encap:Ethernet HWaddr 00:0C:29:4C:D5:92
inet addr:192.168.0.52 Bcast:192.168.0.255 Mask:255.255.255.0
inet6 addr: fe80::20c:29ff:fe4c:d592/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:287225 errors:0 dropped:0 overruns:0 frame:0
TX packets:47133 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:361247254 (344.5 MiB) TX bytes:5159560 (4.9 MiB)
eth0:0 Link encap:Ethernet HWaddr 00:0C:29:4C:D5:92
inet addr:192.168.0.60 Bcast:192.168.0.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:45 errors:0 dropped:0 overruns:0 frame:0
TX packets:45 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:7718 (7.5 KiB) TX bytes:7718 (7.5 KiB)（4）查看mysql-db03的主从同步情况
[root@mysql-db03 ~]# mysql -uroot -p123123 -e ‘show slave status\G‘
Warning: Using a password on the command line interface can be insecure.
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.0.52 #mysql-db03的主库已经切换为mysql-db02
Master_User: rep
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000008
Read_Master_Log_Pos: 271
Relay_Log_File: mysql-db03-relay-bin.000002
Relay_Log_Pos: 361
Relay_Master_Log_File: mysql-bin.000008
Slave_IO_Running: Yes
Slave_SQL_Running: Yes（5）mysql-db01故障恢复
[root@mysql-db01 ~]# /etc/init.d/mysqld start
Starting MySQL. SUCCESS!
[root@mysql-db01 ~]# mysql -uroot -p123123
mysql> CHANGE MASTER TO MASTER_HOST=‘192.168.0.52‘, MASTER_PORT=3306, MASTER_AUTO_POSITION=1, MASTER_USER=‘rep‘, MASTER_PASSWORD=‘123123‘;
Query OK, 0 rows affected, 2 warnings (0.02 sec)
mysql> start slave;
Query OK, 0 rows affected, 1 warning (0.01 sec)
mysql> show slave status\G
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.0.52
Master_User: rep
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000008
Read_Master_Log_Pos: 271
Relay_Log_File: mysql-db01-relay-bin.000002
Relay_Log_Pos: 361
Relay_Master_Log_File: mysql-bin.000008
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
（6）补上缺失的mha配置文件
[root@mysql-db03 ~]# vim /etc/mha/mha1.cnf
[root@mysql-db03 ~]# cat /etc/mha/mha1.cnf
[server default]
manager_log=/var/log/mha/mha1/manager
manager_workdir=/var/log/mha/mha1
master_binlog_dir=/usr/local/mysql/data
master_ip_failover_script=/usr/local/bin/master_ip_failover
password=123123
ping_interval=2
repl_password=123123
repl_user=rep
ssh_user=root
user=mha
[server1]
hostname=192.168.0.51
port=3306
[server2]
hostname=192.168.0.52
port=3306
[server3]
hostname=192.168.0.53
port=3306（7）启动mha管理进程
[root@mysql-db03 ~]# ps -ef | grep mha | grep -v grep
[root@mysql-db03 ~]# nohup masterha_manager --conf=/etc/mha/mha1.cnf --remove_dead_master_conf --ignore_last_failover < /dev/null > /var/log/mha/mha1/manager.log 2>&1 &
[1] 14921
[root@mysql-db03 ~]# ps -ef | grep mha | grep -v grep
root 14921 13211 3 20:11 pts/3 00:00:00 perl /usr/bin/masterha_manager --conf=/etc/mha/mha1.cnf --remove_dead_master_conf --ignore_last_failover此时的架构状态
七，配置binlog-server备份服务器
主库宕机，也许会造成主库binlog复制不及时而导致数据丢失的情况出现，因此配置binlog-server进行时时同步备份，是必要的一种安全手段。
7.1 修改mha配置文件
[root@mysql-db03 ~]# cat /etc/mha/mha1.cnf
[server default]
manager_log=/var/log/mha/mha1/manager
manager_workdir=/var/log/mha/mha1
master_binlog_dir=/usr/local/mysql/data #全局的binlog存放位置
master_ip_failover_script=/usr/local/bin/master_ip_failover
password=123123
ping_interval=2
repl_password=123123
repl_user=rep
ssh_user=root
user=mha
[server1]
hostname=192.168.0.51
port=3306
[server2]
hostname=192.168.0.52
port=3306
[server3]
hostname=192.168.0.53
port=3306
[binlog1] #添加binlog模块
no_master=1 #不允许切换为主
hostname=192.168.0.53 #存放IP
master_binlog_dir=/data/mysql/binlog/ #binlog存放位置优先级比全局的高7.2 拉取主库上的binlog日志到mysql-db03的存放目录里
[root@mysql-db03 ~]# mkdir -p /data/mysql/binlog #创建存放目录
[root@mysql-db03 ~]# cd /data/mysql/binlog/ #进入存放目录
[root@mysql-db03 binlog]# ll
total 0
[root@mysql-db03 binlog]# which mysqlbinlog
/usr/local/bin/mysqlbinlog
[root@mysql-db03 binlog]# mysqlbinlog -R --host=192.168.0.52 --user=mha --password=123123 --raw --stop-never mysql-bin.000001 & #拉取主库binlog
[2] 15694
[root@mysql-db03 binlog]# Warning: Using a password on the command line interface can be insecure.
[root@mysql-db03 binlog]# ll
total 32
-rw-r--r--. 1 root root 143 Sep 5 20:53 mysql-bin.000001
-rw-r--r--. 1 root root 143 Sep 5 20:53 mysql-bin.000002
-rw-r--r--. 1 root root 331 Sep 5 20:53 mysql-bin.000003
-rw-r--r--. 1 root root 3114 Sep 5 20:53 mysql-bin.000004
-rw-r--r--. 1 root root 254 Sep 5 20:53 mysql-bin.000005
-rw-r--r--. 1 root root 800 Sep 5 20:53 mysql-bin.000006
-rw-r--r--. 1 root root 2714 Sep 5 20:53 mysql-bin.000007
-rw-r--r--. 1 root root 120 Sep 5 20:53 mysql-bin.000008
[root@mysql-db03 binlog]# ps -ef | grep mysqlbinlog | grep -v grep
root 16061 12786 0 20:53 pts/2 00:00:00 mysqlbinlog -R --host=192.168.0.52 --user=mha --password=x xxxx --raw --stop-never mysql-bin.0000017.3 启动mha管理进程
[root@mysql-db03 binlog]# nohup masterha_manager --conf=/etc/mha/mha1.cnf --remove_dead_master_conf --ignore_last_failover < /dev/null > /var/log/mha/mha1/manager.log 2>&1 &
[root@mysql-db03 binlog]# ps -ef | grep perl | grep -v grep
root 15697 13211 0 20:42 pts/3 00:00:00 perl /usr/bin/masterha_manager --conf=/etc/mha/mha1.cnf --remove_dead_master_conf --ignore_last_failover八，mysql中间件Atlas
8.1 Atlas简介
Atlas是由Qihoo-360公司web平台部基础架构团队开发维护的一个基于MySQL协议的数据中间层项目。它在MySQL官方推出的MySQL-Proxy-0.8.2版本的基础上，修改了大量bug，添加了很多功能特性。它在MySQL官方推出的MySQL-Proxy0.8.2版本的基础上，修改了大量bug，添加了很多功能特性。
8.2 Atlas主要功能
- 读写分离
- 从库负载均衡
- IP过滤
- 自动分表
- DBA可平滑上下线DB
- 自动摘除宕机的DB
8.3 Atlas相对于官方MySQL-Proxy的优势
- 将主流程中所有Lua代码用C重写，Lua仅用于管理接口。
- 重写网络模型，线程模型
- 实现了真正意义上的连接池
- 优化了锁机制，性能提高数十倍
8.4 安装Atlas
同学么比较有福气，安装Atlas超级简单，官方提供的Atlas有两种：
(普通)：Atlas-2.2.1.el6.x86_64.rpm
（分表）：Atlas-sharding_1.0.1-el6.x86_64.rpm
这里我们只需要下载普通的即可
[root@mysql-db03 rpm]# rpm -ivh Atlas-2.2.1.el6.x86_64.rpm
Preparing... ########################################### [100%]
package Atlas-2.2.1-1.x86_64 is already installed
8.5 配置Atlas
当我们用vim打开/usr/local/mysql-proxy/conf时，我们惊喜的发现。。。这个配置文件完全都根本不用讲。。。简直太简单了。好了课程到此结束，同学们自行阅读。
（1）配置文件里需要做如下修改：
#需要修改的内容一览：
[root@mysql-db03 ~]# cat -n /usr/local/mysql-proxy/conf/test.cnf.bak | egrep -w "12|15|18|30|36|48"
12 proxy-backend-addresses = 127.0.0.1:3306
15 #proxy-read-only-backend-addresses = 127.0.0.1:3305@1
18 pwds = user1:+jKsgB3YAG8=, user2:GS+tr4TPgqc=
30 log-level = message
36 #sql-log = OFF
45 proxy-address = 0.0.0.0:1234
48 admin-address = 0.0.0.0:2345
#将上边内容修改为如下配置：
[root@mysql-db03 ~]# cat -n /usr/local/mysql-proxy/conf/test.cnf | egrep -w "12|15|18|30|36|48"
12 proxy-backend-addresses = 192.168.0.60:3307 #这里添加VIP地址
15 proxy-read-only-backend-addresses = 192.168.0.51:3307@1,192.168.0.53:3307@1 #从库地址
18 pwds = root:++gAN07C/Q0=,mha:++gAN07C/Q0= #MySQL授权用户账号密码（密码要加密）
30 log-level = error #日志级别
36 sql-log = ON #打开日志
45 proxy-address = 192.168.0.53:3306 #Atlas的工作监听端口（提供代理服务）
48 admin-address = 192.168.0.53:1234 #Atlas的管理监听端口
> 提示：
> 主从复制的主从数据库的默认3306端口需要修改成3307
> 第18行为登陆MySQL的授权账号信息，其中密码需要加密（通过/usr/local/mysql-proxy/bin/encrypt加密工具来加密）
（2）修改每个数据库的服务端口为3307
#先杀掉mha管理进程
[root@mysql-db03 conf]# ps -ef | grep mha | grep -v grep
root 15697 1 0 Sep05 ? 00:00:09 perl /usr/bin/masterha_manager --conf=/etc/mha/mha1.cnf --remove_dead_master_conf --ignore_last_failover
[root@mysql-db03 conf]# kill -9 15697
[root@mysql-db03 conf]# ps -ef | grep mha | grep -v grep
#修改mysql-db01,mysql-db02,mysql-db03上的MySQL服务端口为3307
[root@mysql-db03 conf]# sed -n ‘13p‘ /etc/my.cnf
port = 3307
[root@mysql-db02 conf]# sed -n ‘13p‘ /etc/my.cnf
port = 3307
[root@mysql-db01 conf]# sed -n ‘13p‘ /etc/my.cnf
port = 3307
（3）重启每个数据库的服务
过程略
（4）将从库mysql-db01和mysql-db03指向主库mysql-db02进行同步
#mysql-db01和mysql-db03的操作步骤相同
mysql> stop slave; #停止从同步
Query OK, 0 rows affected (0.00 sec)
mysql> CHANGE MASTER TO MASTER_HOST=‘192.168.0.52‘, MASTER_PORT=3307, MASTER_AUTO_POSITION=1, MASTER_USER=‘rep‘, MASTER_PASSWORD=‘123123‘; #授权同步信息
Query OK, 0 rows affected, 2 warnings (0.01 sec)
mysql> start slave; #开始同步
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ‘slavee‘ at line 1
mysql> start slave;
Query OK, 0 rows affected, 1 warning (0.02 sec)
mysql> show slave status\G
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.0.52
Master_User: rep
Master_Port: 3307
Connect_Retry: 60
Master_Log_File: mysql-bin.000010
Read_Master_Log_Pos: 271
Relay_Log_File: mysql-db01-relay-bin.000002
Relay_Log_Pos: 361
Relay_Master_Log_File: mysql-bin.000010
Slave_IO_Running: Yes #同步成功
Slave_SQL_Running: Yes #同步成功
Replicate_Do_DB:
（5）修改mha配置文件
[server default]
manager_log=/var/log/mha/mha1/manager
manager_workdir=/var/log/mha/mha1
master_binlog_dir=/usr/local/mysql/data
master_ip_failover_script=/usr/local/bin/master_ip_failover
password=123123
ping_interval=2
repl_password=123123
repl_user=rep
ssh_user=root
user=mha
[server1]
hostname=192.168.0.51
port=3307 #修改端口号
[server2]
hostname=192.168.0.52
port=3307 #修改端口号
[server3]
hostname=192.168.0.53
port=3307 #修改端口号
[binlog1]
no_master=1
hostname=192.168.0.53
master_binlog_dir=/data/mysql/binlog/（6）启动mysqlbinlog日志备份的进程
[root@mysql-db03 binlog]# ps -ef | grep mysqlbinlog | grep -v grep
[root@mysql-db03 binlog]# mysqlbinlog -R --host=192.168.0.52 --port=3307 --user=mha --password=123123 --raw --stop-never mysql-bin.000001 &
[1] 24880
[root@mysql-db03 binlog]# ps -ef | grep mysqlbinlog | grep -v grep
root 24880 22198 0 01:38 pts/1 00:00:00 mysqlbinlog -R --host=192.168.0.52 --port=3307 --user=mha --password=x xxxx --raw --stop-never mysql-bin.000001
（7）启动mha管理进程
[root@mysql-db03 conf]# ps -ef | grep perl | grep -v grep
[root@mysql-db03 conf]# nohup masterha_manager --conf=/etc/mha/mha1.cnf --remove_dead_master_conf --ignore_last_failover < /dev/null > /var/log/mha/mha1/manager.log 2>&1 &
[1] 24895
[root@mysql-db03 conf]# ps -ef | grep perl | grep -v grep
root 24895 17795 3 01:41 pts/0 00:00:00 perl /usr/bin/masterha_manager --conf=/etc/mha/mha1.cnf --remove_dead_master_conf --ignore_last_failover（8）启动Atlas服务
[root@mysql-db03 conf]# /usr/local/mysql-proxy/bin/mysql-proxyd test start
OK: MySQL-Proxy of test is started
[root@mysql-db03 conf]# ps -ef | grep mysql-proxy | grep -v grep
root 25005 1 0 01:43 ? 00:00:00 /usr/local/mysql-proxy/bin/mysql-proxy --defaults-file=/usr/local/mysql-proxy/conf/test.cnf
root 25006 25005 0 01:43 ? 00:00:00 /usr/local/mysql-proxy/bin/mysql-proxy --defaults-file=/usr/local/mysql-proxy/conf/test.cnf
[root@mysql-db03 conf]#
#说明：
#为何启动服务需要加test，因为在Atlas配置文件里定义了一个实例名字为test
#Atlas实际是启动了某个实例（当然也可以多实例）
[root@mysql-db03 conf]# netstat -antup | grep mysql-proxy
tcp 0 0 0.0.0.0:1234 0.0.0.0:* LISTEN 25006/mysql-proxy
tcp 0 0 0.0.0.0:3306 0.0.0.0:* LISTEN 25006/mysql-proxy
#说明：
#监听3306的为Atlas对外提供代理的端口；监听1234是Atlas的管理监听端口8.6 登陆Atlas管理端口
[root@mysql-db03 conf]# mysql -uuser -ppwd -P1234 -h 192.168.0.53 #登陆Atlas管理端
Warning: Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 1
Server version: 5.0.99-agent-admin
Copyright (c) 2000, 2014, Oracle and/or its affiliates. All rights reserved.
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.
mysql> show databases; #看所有库，报错，并不让看
ERROR 1105 (07000): use ‘SELECT * FROM help‘ to see the supported commands
mysql> select * from help； #按提示输入命令
+----------------------------+---------------------------------------------------------+
| command | description |
+----------------------------+---------------------------------------------------------+
| SELECT * FROM help | shows this help |
| SELECT * FROM backends | lists the backends and their state |
| SET OFFLINE $backend_id | offline backend server, $backend_id is backend_ndxs id |
| SET ONLINE $backend_id | online backend server, ... |
| ADD MASTER $backend | example: "add master 127.0.0.1:3306", ... |
| ADD SLAVE $backend | example: "add slave 127.0.0.1:3306", ... |
| REMOVE BACKEND $backend_id | example: "remove backend 1", ... |
| SELECT * FROM clients | lists the clients |
| ADD
本文系统来源：https://www.cnblogs.com/cash-su/p/10012110.html
数据库问题热搜
- spark-sql(spark sql cli)客户端集成hive
- 关注,粉丝关系的数据库设计
- 【问题】sql数据库报无效的数据证书，需重新安装
- MYSQL问题解决方案：Access denied for user 'root'@'localhost' (using password:YES)
- 解决Access denied for user ''@'localhost' to database 'mysql'
- 亿级数据库分片分库架构设计亿
- Linux解决MySQL-python安装失败问题
- mysql 第四十篇文章~canal+otter的初次尝试
- django数据库的设计
- oracle创建用户、表空间、临时表空间、分配权限步骤详解
- java.sql.SQLSyntaxErrorException: ORA-00911: 无效字符
- MyBatis Sql语句中的转义字符
- 体验mssql-cli
- Oracle数据库，常用SQL语句汇总
- 初入koa2 -连接数据库(遇到的坑之一)
- PHP7.X连接SQLSERVER数据库（CENTOS7）
- mysql"闪回"技术恢复误删除误更改的数据
- 数据库事务
- mongodb07---用户权限
- MySQL ACID及四种隔离级别的解释
- Oracle审计－－AUD$占用空间较大处理方案
- Activiti数据库
- 单机启动TiDB
- Flask学习笔记（3）-数据库迁移
- oracle时间函数
