DBMS criteria and functionality

DBMS Questions

Basically we are trying to evaluate UNIX based DBMS's and we are having trouble deciphering between all the reviews and company claims about the DBMS's. I believe I have realized that my expectations were a bit high for the current array of products. For instance: I was hoping that we could limit access to fields of a DB based on group rights; I was hoping that we could use the OS user groups to identify db user groups; I was hoping that they would have loadbalancing  facilities in the event a server was too full it would route them to one less busy; I was hoping that there would be extensive central administration facilities for distributed systems(i.e. adding a user at one place could add them to all necessary systems); etc...

I was wondering if anyone could try and give me their understanding, opinion, or experiences with any of the topics I list below, I am particularly interested in Sybase, Oracle Informix, DB/2, and Ingres...
I am curions about how well these things are addressed or implemented, are they important? etc...

Thanks for you time and consideration.

        + Security


                - What are c2 and b1 security levels..

                - What is role based security


                - Audit trails...


                        - How are they stored?
                        - Can one get reports?
        + Functions


                - Can scheduling be done?  That is, can a


                  stored procedure or trigger go off according
                  to date and time?

	+ Data Integrity
	       - Declarative
               - Referential

        + Access


                - Can one limit read and write access according to:


                        - group
                        - user
                        - field
                        - table
                        - database

        + DBA Administrative Tools


                - Centralizaton of Administration for multiple


                  distributed servers

        + Support

        + Connectivity


                - routing in the event that a particular


                  server or network is down could seemlessly
                  give access to other duplicate databases

        Capacity


                - load balancing


		- Maximum number of concurrent users

        Standards


                - Ansi level 1

                - Ansi level 2


                - Ansi level 3