What is the concept of redo log in mysql

1. Redo log is a log unique to the MySQLEngine layer and InnoDB storage engine. Also called redo log.

2. Redo log is a physical log. It can be understood as a queue with a fixed space size that will be copied cyclically.

Example

root@test:/var/lib/mysql# pwd
/var/lib/mysql
root@test:/var/lib/mysql# ls -lstr ib_logfile*
49152 -rw-r----- 1 mysql mysql 50331648 Dec 28 15:45 ib_logfile1
49152 -rw-r----- 1 mysql mysql 50331648 Jan  3 12:53 ib_logfile0
root@test:/var/lib/mysql# du -sh ib_logfile*
48M ib_logfile0
48M ib_logfile1
root@test:/var/lib/mysql#

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