ORACLE12C开始的统一审计是什么，有什么优势？

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What Is Unified Auditing?

In unified auditing, the unified audit trail captures audit information from a variety of sources.

Unified auditing enables you to capture audit records from the following sources:

• Audit records (including SYS audit records) from unified audit policies and AUDIT settings
• Fine-grained audit records from the DBMS_FGA PL/SQL package
• Oracle Database Real Application Security audit records
• Oracle Recovery Manager audit records
• Oracle Database Vault audit records
• Oracle Label Security audit records
• Oracle Data Mining records
• Oracle Data Pump
• Oracle SQL*Loader Direct Load
  
  

The unified audit trail, which resides in a read-only table in the AUDSYS schema in the SYSAUX tablespace, makes this information available in a uniform format in the UNIFIED_AUDIT_TRAIL data dictionary view, and is available in both single-instance and Oracle Database Real Application Clusters environments. In addition to the user SYS, users who have been granted the AUDIT_ADMIN and AUDIT_VIEWER roles can query these views. If your users only need to query the views but not create audit policies, then grant them the AUDIT_VIEWER role.

When the database is writeable, audit records are written to the unified audit trail. If the database is not writable, then audit records are written to new format operating system files in the $ORACLE_BASE/audit/$ORACLE_SID directory

Benefits of the Unified Audit Trail

The benefits of a unified audit trail are many.

For example:

• After unified auditing is enabled, it does not depend on the initialization parameters that were used in previous releases. See Table G-1 for a list of these initialization parameters.
• The audit records, including records from the SYS audit trail, for all the audited components of your Oracle Database installation are placed in one location and in one format, rather than your having to look in different places to find audit trails in varying formats. This consolidated view enables auditors to co-relate audit information from different components. For example, if an error occurred during an INSERT statement, standard auditing can indicate the error number and the SQL that was executed. Oracle Database Vault-specific information can indicate whether this error happened because of a command rule violation or realm violation. Note that there will be two audit records with a distinct AUDIT_TYPE. With this unification in place, SYS audit records appear with AUDIT_TYPE set to Standard Audit.
• The management and security of the audit trail is also improved by having it in single audit trail.
• Overall auditing performance is greatly improved. By default, the audit records are automatically written to an internal relational table in the AUDSYS schema.
• You can create named audit policies that enable you to audit the supported components listed at the beginning of this section, as well as SYS administrative users. Furthermore, you can build conditions and exclusions into your policies.
• If you are using an Oracle Audit Vault and Database Firewall environment, then the unified audit trail greatly facilitates the collection of audit data, because all of this data will come from one location.