I want to increase logfile size?

Good day,
frequent log switches occuer in the database. the following message displays in OEM recommendations
Increase the size of the log files to 327 M to hold at least 20 minutes of redo information.
kindly telll me how to increase file size of logfile?
thanks & Regards.

to increase the size, create new log files, check point the old and drop.
sql>select * from v$log
sql>select * from v$controlfile_record_section where type ='REDO LOG'
sql>alter database add logfile group 4 '/app/oracle/oradata/xxxx/redo04.log'
size 350M reuse;
sql>alter system switch logfile;
sql>alter system checkpoint;
Drop old logfiles.
Alter database drop logfile group 1;
note: if there are more than one gropus add same number of groups and delete all older groups

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