How to change the size of redo file

Deal all,
I finish installed the db,and the size of redo file is 50m by default. I found many "checkpoint not complete" events in alert.log file.
Now i want to change it to 100M and try to avoid the event appear again ,how can i do?

As Sb has already correct reply that size of redo logs can not be changed. We have to create new bigger/smaller size of redo logs and then 'alter system switch logfile' to inactivate older logs. Now you can drop older logs. Redo logs are something a glass of water. We can not change the size of glass, if we wish to dring more/less water, we will take that sized glass and we will get that sized water.
Remember to consider the multiplexing/grouping when doing any maintenance like this. And there may be archive log & backup space considerations.
Hans @ http://dbaspot.com/oracle-server/33231-changing-redo-log-file-size.html
Regards
Girish Sharma

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How to change the size of redo file

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