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Rapid growth of AUD$ because ALTER SESSIONS being audited for all users (Doc ID 2408610.1)

Last updated on APRIL 01, 2019

Applies to:

Oracle Fusion Application Toolkit - Version and later
Information in this document applies to any platform.


When a Fusion Application OLTP database is upgraded from 11g to 12c it can be cause a large number of rows be inserted into AUD$ tables if the following items are all TRUE

1. DB is upgraded from 11g to 12c

2. DB Audit is set to any value other than NONE   

SQL> SELECT name, value FROM v$system_parameter WHERE name = 'audit_trail';

NAME                             VALUE
-------------------------------- ------------------------------
audit_trail                      DB, EXTENDED

3. Unified Auditing is disabled

SQL> SELECT parameter, value FROM v$option WHERE parameter = 'Unified Auditing';

PARAMETER                             VALUE
------------------------------------- ------------------------------
Unified Auditing                      FALSE

4. Database Vault is enabled

SQL> SELECT inst_id, parameter, value FROM gV$OPTION WHERE PARAMETER = 'Oracle Database Vault';

INST_ID                  PARAMETER                 VALUE
------------------------ ------------------------- -------
1                        Oracle Database Vault     TRUE
2                        Oracle Database Vault     TRUE

5. ALTER SESSION being audited for all Users


USER_NAME                   PROXY_NAME                 AUDIT_OPTION       SUCCESS       FAILURE      
--------------------------- -------------------------- ------------------ ------------- -------------
                                                       ALTER SESSION      BY ACCESS     BY ACCESS       

6. A lot of ALTER SESSION are being audited on daily basis (results will look similar to)

SQL> SELECT dbms_lob.substr(sqltext,100,1), COUNT(1) FROM sys.aud$ WHERE NTIMESTAMP# > sysdate - 1 GROUP BY dbms_lob.substr(sqltext,100,1) ORDER BY 2 DESC;

DBMS_LOB.SUBSTR(SQLTEXT,100,1)                                                      COUNT(1)
----------------------------------------------------------------------------------- ------------------------------
ALTER SESSION SET TIME_ZONE = 'UTC'                                                 942200
alter session set NLS_TIMESTAMP_TZ_FORMAT = "YYYY-MM-DD HH24:MI:SS.FF TZR"          824593
alter session set NLS_NUMERIC_CHARACTERS = ".,"                                     824593
alter session set NLS_LENGTH_SEMANTICS = "CHAR"                                     824593
alter session set NLS_TIME_TZ_FORMAT = "HH24:MI:SS.FF TZR"                          824593
alter session set NLS_DATE_LANGUAGE = "NUMERIC DATE LANGUAGE"                       824593
alter session set NLS_TIMESTAMP_FORMAT = "YYYY-MM-DD HH24:MI:SS.FF"                 824593
alter session set NLS_TERRITORY = "AMERICA"                                         824593
alter session set NLS_TIME_FORMAT = "HH24:MI:SS.FF"                                 824593
alter session set NLS_COMP = "BINARY"                                               824593
alter session set NLS_DATE_FORMAT = "YYYY-MM-DD"                                    824593
alter session set NLS_SORT = BINARY                                                 824593
alter session set NLS_LANGUAGE = 'AMERICAN'                                         823782


If all the above are found to be TRUE log a SR with Oracle Support to get confirmation to run command to disable auditing ALTER SESSION for all users. When creating the SR please upload the results of the above six items.


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