Audit Vault is a good Oracle Tool to collect all Database Audit Information in a single database repository for managing Database Security. I have used it to collect DB login info , Server access info, SQL statements , before and after images of Data using OS, DB and REDO collectors. Provides and easy to use browser based GUI to generate Standard Reports for Compliance purposes - SOX(Sabanes Oxley) and PCI(Payment Card Industry) compliance and allows custom report generation too.
Room for Improvement:
The underlying Mechanism for collect SQL statements (REDO collector) is still based on Oracle Streams technology. Data in Audit Vault needs to Selected properly and purged at regular intervals else it grows too much to manage. Increases network traffic especially between Audit Vault Server and Source Databases.
DBA skills needed for proper setup. Also, there are situations when the DBA needs to run Oracle streams commands to manage the streams data flows and also monitor Streams propagation and apply activities. Next release probably will use Golden Gate as the underlying technology instead of Streams.