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ALTER SERVER AUDIT (Transact-SQL)

Alters a server audit object using the SQL Server Audit feature. For more information, see Understanding SQL Server Audit.

Topic link iconTransact-SQL Syntax Conventions


ALTER SERVER AUDIT audit_name
  
    TO { [ FILE ( <file_options> [, ...n] ) ] | APPLICATION_LOG | SECURITY_LOG }
    [ WITH ( <audit_options> [, ...n] ) ] 
}
| MODIFY NAME = new_audit_name
[ ; ]
<file_options>::=
{
       FILEPATH = 'os_file_path'
    [, MAXSIZE = { max_size { MB | GB | TB } | UNLIMITED } ]
    [, MAX_ROLLOVER_FILES =integer | UNLIMITED } ]
    [, RESERVE_DISK_SPACE = { ON | OFF } ] 
}
<audit_options>::=
{
    [  QUEUE_DELAY =integer ]
    [, ON_FAILURE = { CONTINUE | SHUTDOWN } ]
    [, STATE = = { ON | OFF } ]
}

TO { FILE | APPLICATION_LOG | SECURITY }

Determines the location of the audit target. The options are a binary file, the Windows application log, or the Windows security log.

NoteNote

Writing to the Security log is not available on Windows XP.

FILEPATH = 'os_file_path'

The path of the audit trail. The file name is generated based on the audit name and audit GUID.

MAXSIZE =max_size

Specifies the maximum size to which the audit file can grow. The max_size value must be an integer followed by MB, GB, TB, or UNLIMITED. The minimum size that you can specify for max_size is 2 MB and the maximum is 2,147,483,647 TB. When UNLIMITED is specified the file grows until the disk is full. Specifying a value lower than 2 MB will raise the error MSG_MAXSIZE_TOO_SMALL. The default value is UNLIMITED.

MAX_ROLLOVER_FILES =integer | UNLIMITED

Specifies the maximum number of files to retain in the file system. When the setting of MAX_ROLLOVER_FILES=0 there is no limit imposed on the number of rollover files that will be created. The default value is 0. The maximum number of files that can be specified is 2,147,483,647.

RESERVE_DISK_SPACE = { ON | OFF }

This option pre-allocates the file on the disk to the MAXSIZE value. Only applies if MAXSIZE is not equal to UNLIMITED. The default value is OFF.

QUEUE_DELAY =integer

Determines the time in milliseconds that can elapse before audit actions are forced to be processed. A value of 0 indicates synchronous delivery. The minimum settable query delay value is 1000 (1 second), which is the default. The maximum is 2,147,483,647 (2,147,483.647 seconds or 24 days, 20 hours, 31 minutes, 23.647 seconds). Specifying an invalid number will raise the error MSG_INVALID_QUEUE_DELAY.

ON_FAILURE = { CONTINUE | SHUTDOWN }

Indicates whether the instance writing to the target should continue or stop if the target cannot perform the write. The login issuing this must have the SHUTDOWN permission. If the logon does not have this permission, this function will fail with MSG_NO_SHUTDOWN_PERMISSION message. The default value is CONTINUE.

STATE = { ON | OFF }

Enables or disables the audit from collecting records. Changing the state of a running audit (from ON to OFF) creates an audit entry that the audit was stopped, the principal that stopped the audit, and the time the audit was stopped.

MODIFY NAME = new_audit_name

Changes the name of the audit. Cannot be used with any other option.

You must specify at least one of the TO, WITH, or MODIFY NAME clauses when you call ALTER AUDIT.

You must set the state of an audit to the OFF option in order to make changes to an audit. If ALTER AUDIT is run when an audit is enabled with any options other than STATE=OFF, you will receive a MSG_NEED_AUDIT_DISABLED error message.

You can add, alter, and remove audit specifications without stopping an audit.

You cannot change an audit’s GUID after the audit has been created.

To create, alter, or drop a server audit principal, you must have ALTER ANY SERVER AUDIT or the CONTROL SERVER permission.

A. Changing a server audit name

The following example changes the name of the server audit HIPPA_Audit to HIPAA_Audit_Old.

USE master
GO
ALTER SERVER AUDIT HIPAA_Audit
WITH (STATE = OFF);
GO
ALTER SERVER AUDIT HIPAA_Audit
MODIFY NAME = HIPAA_Audit_Old;
GO
ALTER SERVER AUDIT HIPAA_Audit_Old
WITH (STATE = ON);
GO

B. Changing a server audit target

The following example changes the server audit called HIPPA_Audit to a file target.

USE master
GO
ALTER SERVER AUDIT HIPAA_Audit
WITH (STATE = OFF);
GO
ALTER SERVER AUDIT HIPAA_Audit
TO FILE (FILEPATH ='\\SQLPROD_1\Audit\',
          MAXSIZE = 1000 MB,
          RESERVE_DISK_SPACE=OFF)
WITH (QUEUE_DELAY = 1000,
       ON_FAILURE = CONTINUE);
GO
ALTER SERVER AUDIT HIPAA_Audit
WITH (STATE = ON);
GO

Updated content

Corrected the Permissions section.

Added the UNLIMITED option to MAX_ROLLOVER_FILES.

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