On 1 Sep 2012, at 11:34pm, "Ted Rolle, Jr." <[email protected]> wrote:

> Back in the olden days we predicted a database's storage to be about 5
> times the size of the data.
> By 'olden' I mean IBM's IMS, VSAM, DB2. ..., 70s, 80s.

Back in the old days you had 72 or 80 columns to a punched card, and any 
columns you didn't use were wasted.  You could double your database 
capacity/speed/cost by saving one bit per record.

Simon.
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