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6.3.12 MySQL Enterprise Audit Log Plugin


MySQL Enterprise Audit is an extension included in MySQL Enterprise Edition, a commercial product. To learn more about commercial products, see

As of MySQL 5.5.28, MySQL Enterprise Edition includes MySQL Enterprise Audit, implemented using a server plugin named audit_log. MySQL Enterprise Audit uses the open MySQL Audit API to enable standard, policy-based monitoring and logging of connection and query activity executed on specific MySQL servers. Designed to meet the Oracle audit specification, MySQL Enterprise Audit provides an out of box, easy to use auditing and compliance solution for applications that are governed by both internal and external regulatory guidelines.

When installed, the audit plugin enables MySQL Server to produce a log file containing an audit record of server activity. The log contents include when clients connect and disconnect, and what actions they perform while connected, such as which databases and tables they access.

After you install the plugin (see Section, “Installing the Audit Log Plugin”), it writes an audit log file. By default, the file is named audit.log in the server data directory. To change the name of the file, set the audit_log_file system variable at server startup.

Audit log file contents are not encrypted. See Section, “Audit Log Plugin Security Considerations”.

The audit log file is written in XML, with auditable events encoded as <AUDIT_RECORD> elements. To select the file format, set the audit_log_format system variable at server startup. For details on file format and contents, see Section, “The Audit Log File”.

To control what information audit_log writes to its log file, set the audit_log_policy system variable. By default, this variable is set to ALL (write all auditable events), but also permits values of LOGINS or QUERIES to log only login or query events, or NONE to disable logging.

For more information about controlling how logging occurs, see Section, “Audit Log Plugin Logging Control”. For descriptions of the parameters used to configure the audit log plugin, see Section, “Audit Log Plugin Options and System Variables”.

If the audit_log plugin is enabled, the Performance Schema (see Chapter 22, MySQL Performance Schema) has instrumentation for the audit log plugin. To identify the relevant instruments, use this query:

SELECT NAME FROM performance_schema.setup_instruments
WHERE NAME LIKE '%/alog/%';

Changes from Older Audit Log Plugin Versions

Several changes were made to the audit log plugin in MySQL 5.5.34 for better compatibility with Oracle Audit Vault.

MySQL 5.7 changed audit log file output to a new format. This format has been backported to MySQL 5.5 and it is possible to select either the old or new format using the audit_log_format system variable, which has permitted values of OLD and NEW (default OLD). The two formats differ as follows:

  • Information within <AUDIT_RECORD> elements written in the old format using attributes is written in the new format using subelements.

  • The new format includes more information in <AUDIT_RECORD> elements. Every element includes a RECORD_ID value providing a unique identifier. The TIMESTAMP value includes time zone information. Query records include HOST, IP, OS_LOGIN, and USER information, as well as COMMAND_CLASS and STATUS_CODE values.

Example of old <AUDIT_RECORD> format:


Example of new <AUDIT_RECORD> format:

 <TIMESTAMP>2013-09-15T15:27:27 UTC</TIMESTAMP>
 <USER>root[root] @ localhost []</USER>

When the audit log plugin rotates the audit log file, it uses a different file name format. For a log file named audit.log, the plugin previously renamed the file to audit.log.TIMESTAMP. The plugin now renames the file to audit.log.TIMESTAMP.xml to indicate that it is an XML file.

If you change the value of audit_log_format, use this procedure to avoid writing log entries in one format to an existing log file that contains entries in a different format:

  1. Stop the server.

  2. Rename the current audit log file manually.

  3. Restart the server with the new value of audit_log_format. The audit log plugin will create a new log file, which will contain log entries in the selected format.

The API for writing audit plugins has also changed. The mysql_event_general structure has new members to represent client host name and IP address, command class, and external user. For more information, see Section, “Writing Audit Plugins”.

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