Chapter 1 A brief history of data warehousing and first-generation data warehouses

In the beginning there were simple mechanisms for holding data. There were punched cards. There were paper tapes. There was core memory that was hand beaded. In the beginning storage was very expensive and very limited.

A new day dawned with the introduction and use of magnetic tape. With magnetic tape, it was possible to hold very large volumes of data cheaply. With magnetic tape, there were no major restrictions on the format of the record of data. With magnetic tape, data could be written and rewritten. Magnetic tape represented a great leap forward from early methods of storage.

But magnetic tape did not represent a perfect world. With magnetic tape, data ...

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