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mysql在线全备份和恢复
在线全备份：
mysqldump -uroot -p --default-character-set=utf8 --opt --master-data=1 --single-transaction --flush-logs databasename > dabase_bak.sql
恢复：
1)# mysql -uroot -p databasename < dabase_bak.sql 2)mysql>source /root/dabase_bak.sql
大数据库的备份恢复：
[root@ticket_backup ~]# vim /etc/my.cnf[mysqld]datadir=/var/lib/mysqlsocket=/var/lib/mysql/mysql.sockuser=mysql# Default to using old password format for compatibility with mysql 3.x# clients (those using the mysqlclient10 compatibility package).old_passwords=1# Disabling symbolic-links is recommended to prevent assorted security risks;# to do so, uncomment this line:# symbolic-links=0log-bin=mysql-binmax_allowed_packet = 32Mquery_cache_size = 32Mkey_buffer_size = 384Mtable_cache = 128K[mysqld_safe]log-error=/var/log/mysqld.logpid-file=/var/run/mysqld/mysqld.pid[mysqldump]max_allowed_packet = 32M
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