Resize Online Redo Log size in Oracle 11g R2

Re size Online Redolog size in Oracle 11gR2

Step 1. Check the status of redolog files

Step2. Create 3 three new redolog file with size 100 MB

alter database add logfile group 4  '/u01/app/oracle/oradata/ORCL/redo04.log' size 100M; 
alter database add logfile group 5  '/u01/app/oracle/oradata/ORCL/redo05.log' size 100M; 
alter database add logfile group 6  '/u01/app/oracle/oradata/ORCL/redo06.log' size 100M; 

Step 4. Check the status of redolog files 

select group#, status from v$log;

Step 5. Switch logfile to change the status 

alter system switch logfile;

Step 6. Wait untill the status set INACTIVE of old three logfiles

Step 7. Once the logfile status set to INACTIVE drop the logfiles

SQL> alter database drop logfile group 1;
SQL> alter database drop logfile group 2;
SQL> alter database drop logfile group 3;

Note: Above steps tested in my lab.