标签 mysql replication 下的文章

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February 21, 2012

发现mysql主从同上步 对于函数过程总是出错
 
MySQL创建函数问题分析：
根据系统提示，导致该错误的原因可能是一个安全设置方面的配置，查手册log_bin_trust_function_creators参数缺省0，是不 允许function的同步的。
一般我们在配置repliaction的时候，都忘记关注这个参数，这样在master更新funtion后，slave就会报告错误，然后slave stoped。
MySQL创建函数问题处理过程：
登陆mysql数据库
> set global log_bin_trust_function_creators ＝ 1;
> start slave;
跟踪mysql的启动日志，slave正常运行，问题解决。
持续跟踪，经过一个晚上，bin-relay-log的数据全部同步完毕。 直接在my.cnf里面添加
log_bin_trust_function_creators ＝ 1
 
========================================================================
创建function时
出错信息：
ERROR 1418 (HY000): This function has none of DETERMINISTIC, NO SQL, or READS SQL DATA in its declaration and binary logging is enabled (you *might* want to use the less safe log_bin_trust_function_creators variable)
 
原因：
这是我们开启了bin-log, 我们就必须指定我们的函数是否是
1 DETERMINISTIC 不确定的
2 NO SQL 没有SQl语句，当然也不会修改数据
3 READS SQL DATA 只是读取数据，当然也不会修改数据
4 MODIFIES SQL DATA 要修改数据
5 CONTAINS SQL 包含了SQL语句

其中在function里面，只有 DETERMINISTIC, NO SQL 和 READS SQL DATA 被支持。如果我们开启了 bin-log, 我们就必须为我们的function指定一个参数。
解决方法：
SQL code
mysql>show variables like '%func%';
+---------------------------------+-------+
|Variable_name                  |Value|
+---------------------------------+-------+
|log_bin_trust_function_creators|OFF  |
+---------------------------------+-------+
1 row in set  (0.00sec)
mysql>set global log_bin_trust_function_creators=1;
Query OK,0 rows affected (0.00sec)
mysql>show variables like '%func%';
+---------------------------------+-------+
|Variable_name                  |Value|
+---------------------------------+-------+
|log_bin_trust_function_creators|ON   |
+---------------------------------+-------+
1 row in set (0.00sec)
mysql>
 
 
试过了，这个方法很有效的。
之前修改了my.ini文件，在mysqld下面加上了log_bin_trust_function_creators=1，都没好使。

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MySQL主从失败错误Got fatal error 1236解决方法

December 27, 2011

由于主服务器异外重启, 导致从报错, 错误如下:
show slave status错误:

mysql> show slave status\G
    Master_Log_File: mysql-bin.000288
    Read_Master_Log_Pos: 627806304
    Relay_Log_File: mysql-relay-bin.000990
    Relay_Log_Pos: 627806457
    Relay_Master_Log_File: mysql-bin.000288
    Slave_IO_Running: No
    Slave_SQL_Running: Yes
    Exec_Master_Log_Pos: 627806304
    Relay_Log_Space: 627806663
    
    
    ......
    Last_IO_Error: Got fatal error 1236 from master when  reading data from binary log:
    'Client requested master to start  replication from impossible position'

mysql错误日志:

tail /data/mysql/mysql-error.log
    111010 17:35:49 [ERROR] Error reading packet from server: Client requested master
     to start replication from impossible position ( server_errno=1236)
    111010 17:35:49 [ERROR] Slave I/O: Got fatal error 1236 from master when reading data
    from binary log: 'Client requested master to start replication from impossible
    position', Error_code: 1236
    111010 17:35:49 [Note] Slave I/O thread exiting, read up to log 'mysql-bin.000288',
    position 627806304

按照习惯, 先尝试必改position位置.

mysql> stop slave;
    mysql> change master to master_log_file='mysql-bin.000288',master_log_pos=627625751;
    mysql> start slave;

错误依旧, 接下来登陆到主服务器查看binlog日志.
先按照错误点的标记去主服务器日志中查找:

[root@db1 ~]# mysqlbinlog --start-position=627655136 /data/mysql/binlog/mysql-bin.000288
    /*!40019 SET @@session.max_insert_delayed_threads=0*/;
    /*!50003 SET @OLD_COMPLETION_TYPE=@@COMPLETION_TYPE,COMPLETION_TYPE=0*/;
    DELIMITER /*!*/;
    # at 4
    #111010 13:31:19 server id 4 end_log_pos 106 Start: binlog v 4, server v 5.1.45-log
    created 111010 13:31:19
    # Warning: this binlog is either in use or was not closed properly.
    BINLOG '
    F1aTTg8EAAAAZgAAAGoAAAABAAQANS4xLjQ1LWxvZwAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
    AAAAAAAAAAAAAAAAAAAAAAAAEzgNAAgAEgAEBAQEEgAAUwAEGggAAAAICAgC
    '/*!*/;
    DELIMITER ;
    # End of log file
    ROLLBACK /* added by mysqlbinlog */;
    /*!50003 SET COMPLETION_TYPE=@OLD_COMPLETION_TYPE*/;

没有看到这个位置.

[root@db1 ~]# mysqlbinlog /data/mysql/binlog/mysql-bin.000288 > test.txt

less text.txt
看最后一部分

# at 627625495
    #111010 16:35:46 server id 1 end_log_pos 627625631 Query thread_id=45613333
    exec_time=32758 error_code=0
    SET TIMESTAMP=1318289746/*!*/;
    delete from freeshipping_bef_update where part='AR-4006WLM' and code=''
    /*!*/;
    # at 627625631
    #111010 16:35:46 server id 1 end_log_pos 627625751 Query thread_id=45613333
    exec_time=32758 error_code=0
    SET TIMESTAMP=1318289746/*!*/;
    delete from shippingFee_special where part='AR-4006WLM'
    /*!*/;
    DELIMITER ;
    # End of log file
    ROLLBACK /* added by mysqlbinlog */;
    /*!50003 SET COMPLETION_TYPE=@OLD_COMPLETION_TYPE*/;

找到最接近错误标记627655136的一个position是627625631.

再回到slave机器上change master, 将postion指向这个位置.

mysql> stop slave;
    Query OK, 0 rows affected (0.00 sec)
    
    mysql> change master to master_log_file='mysql-bin.000288',master_log_pos=627625631;
    Query OK, 0 rows affected (0.06 sec)
    
    mysql> start slave;
    Query OK, 0 rows affected (0.00 sec)

再次查看

mysql> show slave status\G
    *************************** 1. row ***************************
    Slave_IO_State: Queueing master event to the relay log
    Master_Host: 192.168.21.105
    Master_User: rep
    Master_Port: 3306
    Connect_Retry: 10
    Master_Log_File: mysql-bin.000289
    Read_Master_Log_Pos: 25433767
    Relay_Log_File: mysql-relay-bin.000003
    Relay_Log_Pos: 630
    Relay_Master_Log_File: mysql-bin.000289
    Slave_IO_Running: Yes
    Slave_SQL_Running: Yes

主从同步正常了, 同样的方法修复其它slave机器.

mysql运行在nat环境下的报错：
```
ERROR 2013 (HY000): Lost connection to MySQL server at 'reading initial communication packet', system error: 2
```
解决办法：
```
bind-address = 0.0.0.0
```

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mysql-binlog-format三种复制模式

December 22, 2011

复制参数binlogformat
MySQL 5.1 中，在复制方面的改进即便引进了新的复制技巧：基于行的复制。简言之，这种新技巧即便关怀表中发生改变的登记，而非过去的照抄 binlog 形式。从 MySQL 5.1.12 开始，能够用以下三种形式来告终：


基于SQL语句的复制(statement-based replication, SBR)，
基于行的复制(row-based replication, RBR)，
混杂形式复制(mixed-based replication, MBR)。

相应地，binlog的款式也有三种：STATEMENT，ROW，MIXED。MBR 形式中，SBR 形式是默认的。

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MySQL主从复制下的备份策略

December 22, 2011

#!/bin/sh
    
    unset LANG
    LC_ALL=C
    export LC_ALL
    PATH=$PATH:/usr/local/mysql/bin
    export PATH
    
    user=root
    password=xnjcwmysql
    master_host="192.168.0.250"
    port=3306
    master_port=3306
    backup_lv_name="/dev/vg/data"
    backup_path="/home/backup"
    backup_dir="mysql"
    backup_binlog_dir="binlog"
    backup_binlog_name="binlog_`date +%Y%m%d --date='1 days ago'`.tar.bz2"
    backup_binlog_expire="binlog_`date +%Y%m%d --date='8 days ago'`.tar.bz2"
    remote_backup_host="192.168.0.200"
    remote_backup_path="/data/databases"
    remote_backup_name="`date +%w --date='1 days ago'`.tar.bz2"
    remote_backup_binlog_name="binlog_`date +%w --date='1 days ago'`.tar.bz2"
    
    ## 刷新 master 的 binlog
    mysql -u$user -p$password -h$master_host -P$master_port -e 'flush logs'
    
    ## 停止 slave
    sleep 5
    mysql -u$user -p$password -P$port -e 'slave stop'
    sleep 5
    
    ## 创建 MySQL 数据 逻辑卷 的快照
    modprobe dm-snapshot
    lvcreate -l 486 -s -n mysql_snap $backup_lv_name
    
    ## 启动 slave
    mysql -u$user -p$password -P$port -e 'slave start'
    
    ## 备份 binlog
    mkdir -p /mnt/mysql_snap
    mount /dev/vg/mysql_snap /mnt/mysql_snap
    cd /mnt/mysql_snap
    tar cjpf $backup_path/$backup_binlog_dir/$backup_binlog_name `ls | grep mysql-bin.[0-9]`
    
    ## 备份数据库文件
    rsync -a --delete --exclude "mysql-bin.*" --exclude "*.MYI" --exclude "relay-log.info" /mnt/mysql_snap/ $backup_path/$backup_dir/
    cp -af /mnt/mysql_snap/mysql/*.MYI $backup_path/$backup_dir/mysql/
    
    #?把备的的 binlo压缩包包传送到远程备份主机scpcp $backup_path/$backup_binlog_d/r/$backup_binlog_name $remote_backup_ho:t:$remote_backup_path/$remote_backup_binlog_name
    
    ## 打包备份目录并传送到远程备份主机
    cd $backup_path
    tar -cjpf - $backup_dir | ssh $remote_backup_host "cat > $remote_backup_path/$remote_backup_name"
    
    ## 删除快照
    umount /mnt/mysql_snap
    lvremove -f /dev/vg/mysql_snap
    rm -rf /mnt/mysql_snap
    rmmod dm-snapshot
    
    ## 删除过期的 binlog
    rm -f $backup_path/$backup_binlog_dir/$backup_binlog_expire
    
    ## 清除已备份的 binlog
    curr_binlog=`mysql -u$user -p$password -P$port -e 'show slave status\G' | grep Master_Log_File | awk '{print $2}' | uniq`
    mysql -u$user -p$password -h$master_host -P$master_port -e 'purge master logs to "'$curr_binlog'"'
    mysql -u$user -p$password -P$port -e 'purge master logs to "'$curr_binlog'"'

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