By Robert Laberge, Srdjan Vujosevic
* Introduces the cellular databases (their structure and contours) and the way they function and deal with the basic activity of synchronization. * Explains how the firm workforce can circulation to a hand-held equipment and now have quick access to company databases. * site comprises all resource code for operating examples of purposes displaying cellular databases in use. * Foreword and endorsement through invoice Inmon, the "Father of knowledge Warehousing."
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Extra info for Building PDA Databases for Wireless and Mobile Development
Worse yet, if the data is of a personal nature to your clients, you might find yourself in a legal battle. PDA Units PDA units are excellent as presentation−layer front−end devices. The screens are small, but can still show quite a bit of information. They have processing power and memory and are therefore also able to manage the logic layer. Since these units have the capability to hold databases, large and small, the data layer can be contained on the individual units as well. In effect, a single Compaq iPaq could be considered a single−tier, 35 Final Thoughts all−in−one system, very effective for salespeople and portable applications.
A data mart is usually its own database, just as a data warehouse historical repository is usually its own database. The data mart is created from the data in the data warehouse historical repository and is, therefore, a subset of that historical data. You cannot have data in a data mart unless it's initially in the data warehouse historical repository. Since data marts are a subset of data in the historical repository, they can therefore be recreated at any time. Remember that many users requested specific data for their own use.
Now, all this seems fine and dandy, but the real kicker was the fact that multiple users could now access the same data at the same time. Think about this. Only about 20 to 25 years ago, large corporations were running their entire computer systems and divisions, mostly for accounting departments, on flat files. For those of you who remember those days, computer programs were all based on punch cards. Flat files were simply one record per punch card. Very large computers read the cards until the card being sought was found, and then retained the ongoing calculation results in memory if memory was availablewhich is laughable from today's standards since we have huge memory space available and the capability to create temporary or permanent files directly to disk.