: hello, there are some question : 1¡¢I have learned the DB Tools 4 for oracle , but I want to know how it read : the oralce log file . usually, the format of log file is secret and not : open. Which log file do you mean? If you mean Redo Logs, DB Tools doesn't read them directly, it reads data from the system tables. If you mean the alert logs and trace files, these files are plain text files : 2¡¢The audit for data change is implemented by what method, read log file or : monitor the database activity ? Triggers on monitored tables : 3¡¢Have some performance effects on database server when you install the DB : tools to audit the data change ? This depends on the transaction rate and volume (inserts/deletes/updates). It also depends on configuration/tuning state of your server. In general, the impact should be very minimal to unnoticed. As an advice, do not audit tables with high transaction rate, because any aduting method will cause some performance hit. : thanks
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