How to clear the alertlog and trace file?

since the database was created,the log and trace file have't been cleared.how to clear the alertlog and trace file?3tx!!

Hi Friend.
You can eliminate all the files ".TRC" (trace files) to purify the directory BDUMP. These are not necessary files in order that the Oracle Server works.
The file Alert.log is a file that the Oracle Server can recreate if you eliminate it. When Oracle Server's process realizes certain action (for example ARCH), Oracle creates again the file (if it does not exist), or it adds text (if it exists) with the new income.
It can happen, that appears some Bug if the file Alert.log does not exist. Though this is slightly possible.
Anyhow I recommend to you in UNIX to use from the prompt: $> filename in order to take the size of the file to 0 bytes, without need to eliminate it. Is the same thing when you want to purify the listener.log, the sqlnet.log or the sbtio.log.
I wait for my commentaries you be of great help.
Bye Friend...

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