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Check the audit trail for logins as SYSDBA to make sure that only authorized people are logging in as SYSDBA users. The audit trail also lets you see whether the database was brought up at any time with the auditing feature disabled. You should audit all unsuccessful attempts to log into the database. In addition, you can audit all actions by any user connected as SYSDBA or SYSOPER. To enable auditing of all SYSDBA and SYSOPER operations, you need to set the following initialization parameter: AUDIT_SYS_OPERATIONS=TRUE

Use what is best for your current database, and reimplement components as you go to other databases Use good programming techniques to isolate yourself from these changes I call this defensive programming..

Setting AUDIT_SYS_OPERATIONS=TRUE logs all SYSDBA and SYSOPER activity to an operating system audit trail, not a database audit trail. Thus, the audit trail can t be tampered with by users with powerful privileges within the database.

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In many other databases, if you wanted to get a consistent and correct answer to this query, you d either have to lock the whole table while the sum was calculated or you d have to lock the rows as you read them This prevents people from changing the answer as you are getting it If you lock the table up front, you get the answer that was in the database at the time the query began If you lock the data as you read it (commonly referred to as a shared read lock, which prevents updates but not other readers from accessing the data), you get the answer that was in the database at the point the query finished Both of these methods inhibit concurrency a great deal.

Oracle recommends strongly that you avoid granting ANY privileges, as in delete ANY table, to reduce your vulnerability. You can avoid this problem generally by refraining from (carelessly) granting object privileges directly to users. In addition, avoid granting privileges with the ADMIN privilege. The ADMIN privilege means that the user to whom you granted a privilege can grant the same privilege to other users in turn. This means that you, the DBA, can very quickly lose control over who is being granted privileges in your database. Use roles rather than granting privileges directly to users. This will help you a lot on databases with a large user base, where it is hard to check which user has been granted which privilege if you have been granting them directly to the users.

The same defensive programming techniques that I advocate for building truly portable database applications are, in essence the same as those employed by people writing OS-portable applications. The goal is to fully utilize the facilities available to you, but ensure you can change the implementation on a case-by-case basis. As an analogy, Oracle is a portable application. It runs on many operating systems. However, on Windows it runs in the Windows way: using threads and other Windows-specific facilities. On UNIX, Oracle runs as a multiprocess server, using individual processes to do what threads did on Windows that is the UNIX way. The core Oracle functionality is available on both platforms, but it is implemented in very different ways under the covers. Your database applications that must function on multiple databases will be the same. For example, a common function of many database applications is the generation of a unique key for each row. When you insert the row, the system should automatically generate a key for you. Oracle has implemented the database object called a SEQUENCE for this. Informix has a SERIAL datatype. Sybase and SQL Server have an IDENTITY type. Each database has a way to do this. However, the methods are different, both in how you do it and the possible outcomes. So, for the knowledgeable developer, there are two paths that can be pursued: Develop a totally database-independent method of generating a unique key. Accommodate the different implementations and use different techniques when implementing keys in each database.

PUBLIC is a default role for every user created in the database. Make sure you don t grant any unnecessary roles or privileges to PUBLIC, because every user will automatically inherit those roles and privileges, including default users such as DBSNMP and OUTLN. The following query shows that PUBLIC has over 12,000 object-level privileges: SQL> SELECT COUNT(*) FROM dba_tab_privs 2 WHERE grantee='PUBLIC'; COUNT(*) -------12814 SQL> Of the more than 12,000 object privileges that have been granted to PUBLIC, over 100 are privileges to execute DBMS packages, such as DBMS_JOB, DBMS_METADATA, DBMS_SNAPSHOT, DBMS_DDL, DBMS_SPACE, and DBMS_OBFUSCATION_TOOLKIT. Revoke all important execution privileges from PUBLIC. Grant important privileges to users through the judicious use of roles. The SYSDBA privilege gives a user very powerful privileges, including the ability to drop database objects and alter data dictionary tables. It goes without saying that you must hand out the SYSDBA privilege very sparingly.

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