要在Oracle中启用审计功能，您可以按照以下步骤操作：
1、使用sysdba权限登录到Oracle数据库。
2、运行以下命令启用标准审计功能：
SQL> ALTER SYSTEM SET AUDIT_TRAIL=DB SCOPE=SPFILE;
SQL> SHUTDOWN IMMEDIATE;
SQL> STARTUP;
3、运行以下命令启用审计功能：
SQL> AUDIT SELECT TABLE, INSERT TABLE, UPDATE TABLE, DELETE TABLE BY ACCESS;
SQL> AUDIT SELECT TABLE, INSERT TABLE, UPDATE TABLE, DELETE TABLE BY SESSION;
4、运行以下命令启用审计功能：
SQL> AUDIT DROP ANY TABLE BY ACCESS;
SQL> AUDIT CREATE ANY TABLE BY ACCESS;
SQL> AUDIT ALTER ANY TABLE BY ACCESS;
SQL> AUDIT DROP ANY PROCEDURE BY ACCESS;
SQL> AUDIT CREATE ANY PROCEDURE BY ACCESS;
SQL> AUDIT ALTER ANY PROCEDURE BY ACCESS;
5、在需要审计的表上设置审计功能：
SQL> AUDIT SELECT, INSERT, UPDATE, DELETE ON <table_name> BY ACCESS;
6、重新启动数据库以使更改生效。
请注意，启用审计功能可能会对系统性能产生一定影响，因此建议在必要时才启用审计功能。
