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Auditing is always about accountability, and is frequently done to protect and preserve privacy for the information stored in databases. Concern about privacy policies and practices has been rising steadily with the ubiquitous use of databases in businesses and on the Internet. Oracle Database provides a depth of auditing that readily enables system administrators to implement enhanced protections, early detection of suspicious activities, and finely-tuned security responses.
Oracle Database Unified Auditing enables selective and effective auditing inside the Oracle database using policies and conditions. The new policy based syntax simplifies management of auditing within the database and provides the ability to accelerate auditing based on conditions. For example, audit policies can be configured to audit based on specific IP addresses, programs, time periods, or connection types such as proxy authentication. In addition, specific schemas can be easily exempted from auditing when the audit policy is enabled.
New roles have been introduced for management of policies and the viewing of audit data. The AUDIT_ADMIN and AUDIT_VIEWER roles provide separation of duty and flexibility to organizations who wish to designate specific users to manage audit settings and view audit activity. The new architecture unifies the existing audit trails into a single audit trail, enabling simplified management and increasing the security of audit data generated by the database. Audit data can only be managed using the built-in audit data management package within the database and not directly updated or removed using SQL commands. Three default policies are configured and shipped out of the box. Oracle Audit Vault and Database Firewall is integrated with the Oracle Database Unified Auditing for audit consolidation, reporting, and analysis. Please refer to the Oracle documentation for additional details on auditing with the Oracle database.
Oracle Database provides robust audit support in both the Enterprise and Standard Edition of the database. Audit records include information about the operation that was audited, the user performing the operation, and the date and time of the operation. Audit records can be stored in the database audit trail or in files on the operating system. Standard auditing includes operations on privileges, schemas, objects, and statements.
Oracle recommends that the audit trail be written to the operating system files as this configuration imposes the least amount of overhead on the source database system. To enable database auditing, the initialization parameter, AUDIT_TRAIL, should be set to one of these values:
|DB||Enables database auditing and directs all audit records to the database audit trail (SYS.AUD$), except for records that are always written to the operating system audit trail|
|DB,EXTENDED||Does all actions of AUDIT_TRAIL=DB and also populates the SQL bind and SQL text columns of the SYS.AUD$ table|
|XML||Enables database auditing and directs all audit records in XML format to an operating system file|
|XML,EXTENDED||Does all actions of AUDIT_TRAIL=XML, adding the SQL bind and SQL text columns|
|OS (recommended)||Enables database auditing and directs all audit records to an operating system file|
In addition, the following database parameters should be set:
For more information and best practices on Oracle Database Auditing please read Introduction to Auditing in the Oracle Database Security Guide.