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Sorry for taking so long to get back at you but, as I said, I had to build a pro-System i5 presentation about building a data warehouse in the i5. The audience were end users and developers that love MS Access, ORACLE and SQL Server. The presentation went well and the System i5 data warehouse project here is well underway with more wanting access or to put their data into it, as we "speak". It doesn't mean the whole war is won but a major battle along the way and things are looking good. Now to the answer I owe you for the statement I made about "DB2/400 is not a real RDBMS".
I'll provide you with SOME of the total answer to this as a full and complete answer would take an article or paper to fully discuss. Some of the answers are IBM some are how the system is used and some are the two different cultures (Real RDBMs culture vs. AS/400/System i5) Also, it would be VERY helpful to have a pretty thorough understanding of the RDBMS history, technical attributes of the most popular RDBMs, the accepted industry standards for how RDBMs are used, ANSI standards, and, most important, the marketplace for what is an acceptable and real RDBMS with regard to function, features, architecture, security, etc.
A typical question: "I have heard people state that DB2/400 meets more of the ANSI Standards for SQL databases than any other database on any other platform. Isn't that the standard by which to say what database is "best"?"
In the real world, not really. Those that look at buying an RDBMS look at several things and this is a partial list: functions,
features,
robustness,
industry architecture compatibility,
which leads into can I find personnel that have the education to create and maintain databases and applications against a particular RDBMS engine or how easy is it to train them,
ease of care and feeding,
reputation in the IT space,
how many vendors support with tools of various types,
security
and price.
Another typical question: "What is it that these other databases have that DB2/400 does not have that are useful for designing business application databases?"
- They (real industry standard RDBMs) are set up as a true RDBMS with TABLES, NOT files, VIEWS, NOT logical files, INDEXES, NOT logical files, etc.,
- TABLES can only be in table format, usually designed using third normal form to take advantage of the strengths of the RDBMS, NOT old style flat files, or multi-member files that access data via keyed access...
there is NO SUCH THING as a file in DB2 or ORACLE and I think in SQL Server as well.
- Multi-member TABLES are not allowed in a true RDBMS.
- SQL is the ONLY access language to get to the data, not some old record-at-a-time processing back door technique like READ, WRITE, CHAIN, etc.,
- ALL information about the structure of every TABLE, VIEW, INDEX, etc., in a SYSTEM catalog or tables, which are only accessed via SQL, not in each of the files themselves wherein you have to use a non-SQL command Display FILE FIELD Description or some such
- the System Catalogs are many and robust, like in DB2 for VM or MVS or the V$ tables in ORACLE to support MANY types of database and application designs from simple tables to the storage of BLOBs, XML and much more.
- HUGE numbers of vendor tools are available for database design and build and reverse engineering, application design and build, performance tuning, and much more
- database has mechanisms for 24/7 operation WITH backup by being able to quiesce portions of the database for backup while the rest of the database is active
- DBAs and application developers think and design only around TABLES, not files using record-at-a-time processing
- DBAs design TABLES using Referential Integrity and other functions on a regular basis such that many actions that once were done by the developers program are now done at the database level
- Managers have an easy time finding personnel that can read, write and speak in SQL and industry standard RDBMS methodologies whereas they see folks that use RPG (they think that means Rocket Propelled Grenade) and CL (what's that) and SEU, PDM, etc. as being from an OLD, LEGACY system that is so out there in a vary narrow part of the world.
- The real DB2s and ORACLE and SQLServer are well respected in the industry for these and many other reasons and DB2 and ORACLE run on many different OSs and MANY applications are built on those platforms
- and on, and on, and on
So, the IT industry, as a general and common rule, recommending a platform and an RDBMS to the CEO and CFO to buy will not even see the System i5 as in the running. This has to change if the platform and the jobs it supports are to survive. I hope it can be done. But the traditional System i5/AS/400 folks out there are going to have to come into the reality of the rest of the world and not only see things from their staid and outmoded perspective.
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