Yes, It is okay to change the password for the installer accounts. Just remember, if you are on a grid environment, use the same password on all the servers. And if the requirement is to be done on a regular intervals, keep a pattern so that you would not mess up remembering. Coming to frequency- you can change it frequently like once in a month. And for the point- How to change, you can do it as easily as u do for any other user on a Linux server using the command- passwd . Hope this is useful.
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