Wednesday, December 30, 2015

Interpreting Codd: LOGIC FOR SERIOUS DATABASE FOLKS

David McGoveran has been working on a book on logic for database professionals. He will post articles online for review that will become chapters in the book. He has just posted first 4 along with a revised "Series Introduction" (link below).

I thought it's worth sharing a short note he sent me on what prompted the book and what some of its objectives are.

Wednesday, December 23, 2015

Documents and Databases


My December post @All Analytics

Don't let the label fool you. It's the relational data model (RDM), not SQL that NoSQL proponents really are rejecting. The main argument, advanced in a recent LinkedIn exchange, is that lots of information "cannot be represented in rows and columns". The implication is that the RDM is not general enough -- there are certain types of information that it cannot represent. The response from my colleague in RDM David McGoveran, is important enough to restate here.

Read it all. (Comment there, not here, please. Thanks.)



                                                   Happy new year!






Sunday, December 20, 2015

Weekly Update

1. Quote of the Week
According to Wikipedia, Amazon's Redshift is a modified version of Postgres.
Maybe its speed redshifted data integrity into a bloody mess.

It has no primary keys, foreign keys or unique constraints. It just has optimizer hints in the DDL that *maybe* the data behaves that way. If they want to put hints in the DDL, OK, but don't call those hint PRIMARY KEY, FOREIGN KEY or UNIQUE.
--Unsupported PostgreSQL Features - Amazon Redshift

I don't think any version of Postgres lets you say Create Table Foo (Bar Int PRIMARY KEY) and then let you do
INSERT INTO Foo (BAR) Values (42)
INSERT INTO Foo (BAR) Values (42)
INSERT INTO Foo (BAR) Values (42)
That might be fine for a one time only static data warehouse, but an ongoing data update system is going to break the integrity rules, it is just a matter of time. That would make for some surprises when someone decides to migrate their data and lots of application code from a relational DBMS to Redshift.
--Jeff Winchell

Sunday, December 13, 2015

Moving in Circles: RDBMS-SQL Conflation & Logical-Physical Confusion

In my last post I demonstrated how disregard for the scientific foundation and history of a field, here, database management, leads to Moving in Circles. The piece I debunked was by CTO of VoltDB, one in the "VVV" series of products by Michael Stonebraker (MS). I've recently come across The Traditional RDBMS Wisdom is All Wrong, a presentation by the man himself, that reinforces my point.

Sunday, December 6, 2015

Weekly Update

 To all my Jewish readers:


I was making minor revisions to Surrogate Key Illusions when I ran across this: How To Find Duplicate Addresses For A PhysicianRowID

1. Quote of the Week

The entire Information Technology industry is still stuck in 1971 with Dr. Codd's 3rd Normal form ... when 3 more exist and now a 7th or (N) Normal Form ... Dr. Codd, created, devised, extrapolated 6 forms of Data NORMALIZATION, and after 45 years (1971), every single Database system or information management system to date has not exceeded the 3rd normal Form... except AtomicDB, (N) Normal Form improving on Dr. Codd's work by 4 levels(dimensions)at the very least ... There was and is a method to his theory, that with each level of Normalization brings a geometric increase in "Efficiency" and scalability, however, no one has even attempted the restrictions of the 4th normal form (no duplicates) let alone the 5th or 6th, and now with Dr. Everett’s (N)th Normal form, we can do anything the human mind can devise on a computer and in nearly real time. --Jean Michel LeTennier, CTO, Atomic Database Corp.