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_shutdownis 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.cnfto change the log file configuration.
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 writes a log checkpoint, closes and
removes the old log files, creates new log files at the requested
size, and opens the new log files.