To change the number or size of
redo log files in MySQL 5.6.7
or earlier, perform the following steps:
SET GLOBAL innodb_fast_shutdown = 1;
After ensuring that
innodb_fast_shutdown is not
set to 2, stop the MySQL server and make sure that it shuts
down without errors (to ensure that there is no information
for outstanding transactions in the log).
Copy the old log files into a safe place in case something went wrong during the shutdown and you need them to recover the tablespace.
Delete the old log files from the log file directory.
my.cnf to change the log file
As of MySQL 5.6.8, the
innodb_fast_shutdown setting is
no longer relevant when changing the number or the size of
InnoDB log files. Additionally, you are no
longer required remove old log files, although you may still want
to copy the old log files to a safe place, as a backup. To change
the number or size of
InnoDB log files, perform
the following steps:
InnoDB detects that the
innodb_log_file_size differs from
the redo log file size, it will write a log checkpoint, close and
remove the old log files, create new log files at the requested
size, and open the new log files.