Can change the size of the redolog files while the database is running.

How the size of the redolog files will hurt your database performance ?
Can change the size of the redolog files while the database is running in oracle 9i. ?
What will be its impact on the standby database ?
Thanks in advance.

redo logs that are too small can cause waits on the switches for heavily utilized systems. logs that are too large are a pain the a$$ during recovery. check v$loghist to see how often switches occur - an average of 20 minutes is good; if you have many switches happening back-to-back, that's a bad sign.
you can change the sizes while the db is up. choose a redo group that is INACTIVE, drop it, delete the files, and recreate it with larger files. then force a switch ("alter system switch logfile;"), and do another inactive group. I actually prefer to do as many switches as necessary to make the new group active so I can verify that I didn't screw up before dropping the next group.
not sure of impact on standby database.

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