MySQL log

redolog and binlog

• redolog yes innodb Self contained ,binlog yes mysql Self contained
• redolog It is similar to buffer , Write the transaction information to this buffer , With redolog The database can crash and restart without losing data ,innodb_flush_log_at_trx_commit Set to 1 You can persist transactions to disk every time ,innodb_log_buffer_size Is the cache size
• binlog Is to record the log of logic modification ,sync_binlog Set to 1 Can guarantee binlog Don't lose
• Timing by mysqldump Backup database , according to binlog Recover data in time

mysqldump

• mysqldump -u root -p --databases xx xxx xx > xx.sql Save multiple databases
• mysqldump -u root -p aaa bbb > xx.sql aaa Library bbb surface
• mysqldump -u root -p --no-data As long as the table structure

binlog

• show variables like ‘%bin%’ see binlog Open or not
• If it is not opened, it is my.cnf Of mysqld Add below log_bin=mysql-bin
• show binlog events in ‘mysql-bin.00000x’; see binlog
• mysqlbinlog binlog The full path -d Database name --skip-gtids --start-position= Serial number --stop-position= Serial number > xx.sql binlog Convert to corresponding sql
• –start-datetime,–start-position and –stop-position All optional parameters
• binlog It is divided into 3 Two recording modes ,statement,row and mixed
• statement： Record native sql, It is possible that the master-slave execution will be inconsistent , Not recommended
• row： Record information , Executive sql The amount of data is very large and takes up a lot of space
• mixed： Top two blends , If mysql If you think there will be no inconsistency, use statement Record , Too much data to use row Record

undolog

• Reverse operation of record operation , Used to rollback and maintain consistency