Oracle Database 9i and 10g disables Fine Grained Audit (FGA) after the SYS user executes a SELECT statement on an FGA object, which makes it easier for attackers to escape detection.
https://exchange.xforce.ibmcloud.com/vulnerabilities/20407
https://euvd.enisa.europa.eu/vulnerability/EUVD-2005-1498
http://www.securityfocus.com/bid/16258
http://www.red-database-security.com/advisory/oracle-fine-grained-auditing-issue.html