Re: How to determine database market share?

From: hpuxrac <>
Date: 5 Nov 2005 08:20:12 -0800
Message-ID: <>

# Meanwhile most relational databases, particularly Oracle, become less

# relational with each release. Codd defined relational as the extent
to which
# the user of the data (via DML) is isolated from the way the data is
# physically stored. Some of these things are to improve performance
# hints in Oracle) or to improve concurrency (WITH UR in DB2) but they
# decidedly not relational in nature.

Um I guess I would agree (maybe somewhat) with only your first sentence above.

Starting with the second sentence you are not exactly close.

The relational model says nothing about physical storage.

The relational model says nothing about hints in SQL statements.

The relational model says nothing about concurrency.

Each vendor has developed proprietary technology to improve the performance of their products agreed.

But arguing that these parts of the technology stray from a relational model when the model doesn't say anything about them is not good logic. Received on Sat Nov 05 2005 - 17:20:12 CET

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