命令:tar cvfz /oracle/backup/101014db.tar.gz /oracle/backup

命令:tar cvfz /oracle/backup/101014db.tar.gz /oracle/backup

命令:tar cvfz /oracle/backup/101014db.tar.gz /oracle/backup

有的时候正常,有的时候出现下面的错误,为什么呢?
tar: /oracle/backup/101014db.tar.gz: file changed as we read it
tar: Error exit delayed from previous errors
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Files in that directory is being modified when you tar it.Shutdown your database first .