barcode generator in vb.net 2005 PART VI in Software

Generation QR Code 2d barcode in Software PART VI

PART VI
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Part VI:
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SQL Today and Tomorrow
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The market for embedded databases has remained relatively small, due in part to extreme pricing pressure. Because these databases are embedded into other products, the per-unit cost of the database system (to the product vendor) becomes a part of the product cost, just as if it were a plastic or electronic part. Product vendors negotiate these costs aggressively, and it s not unusual for an embedded database for a volume product to generate only a few dollars per unit for its vendor. For this reason, most embedded databases still come from smaller, often venture-backed, vendors. There are some exceptions, most notably the BerkeleyDB offering from Oracle, which acquired the product and the company that produced it.
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Mobile Databases
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A fourth type of specialty database is especially tuned to support the data management needs of handheld devices, such as personal digital assistants (PDAs), handheld computers, smartphones, and mobile laptop computers. Because these devices are battery powered, they typically have very limited resources compared with the database servers that host enterprise databases. They usually have much less powerful and slower processors, much more limited memory, and much smaller disk storage or no disk storage at all (using flash memory as alternative nonvolatile storage). Over the last decade, the rising popularity of laptop and notebook computers, and the emergence of entire new categories of intelligent handheld devices, have sparked the development of SQL-based mobile databases to support these devices and their applications.
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Mobile databases typically play one or more well-defined roles on the devices that they support: Support for device operation The database may store configuration data or the current user selections for optional capabilities that can be configured or switched on and off. This role is generally hidden from the user and uses the mobile database as an embedded database. Support for embedded applications On a handheld computer, the personal appointment calendar may be stored in a local database to make it easily searchable. On a smartphone, the list of contacts and their addresses, e-mail addresses, various phone numbers, and the like may be stored in a database. The database may be hidden from user view, but the application is readily visible. Support for mobile packaged applications Enterprise applications may use a handheld computer or a laptop as a data collection or data analysis device, where a user enters data via a form or graphs the data. Local database processing Occasionally, the users of a laptop or handheld computer may require a personal database for storing information that they generate or analyze. Access to enterprise databases The mobile device may be a portal through which the user accesses data stored in an enterprise database. The local database software accepts data access or data manipulation requests, passes them on to the enterprise database, receives the results, and passes them back to local software on the mobile device through a local API.
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26:
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Specialty Databases
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Synchronization with an enterprise database is a signature characteristic of the leading mobile database products. When no network connection is available, the mobile database supports stand-alone operation for mobile applications running on the mobile device. When a network connection becomes available, the mobile database provides intelligent resynchronization, uploading changes made to the local database, receiving changes made to the enterprise database, and resolving any conflicts between them. In addition, when a network connection is available, the mobile database may act as an intelligent cache, storing a local copy of frequently accessed data to avoid the network overhead of repeated access.
Mobile Database Implementations
Sybase s SQLAnywhere product enjoys the largest market share in the mobile database market, primarily due to its popularity on laptop computers. The product offers a good balance between fairly comprehensive SQL support and relatively modest resource requirements. It provides data synchronization with enterprise databases through industrystandard APIs (ODBC and JDBC), so that integration with almost any commercial enterprise database product is possible. The product also provides good manageability for environments where it is broadly deployed, such as deployment to a field sales organization or a mobile maintenance force. Sybase has aggressively marketed SQLAnywhere to mobile and enterprise application developers as a mobile database that can easily be embedded into the mobile editions of their products or delivered in conjunction with those products. Even when not embedded, mobile applications tend to provide SQLAnywhere support because of its popularity. The product is part of an overall focus on mobile applications at Sybase, and because of this emphasis, has maintained or grown its market share. Oracle s mobile database offering is Oracle Lite, which it markets as a complement to its flagship enterprise database. Oracle Lite runs on laptop computers and selected other mobile devices. An Oracle-supplied synchronization server provides the back-end anchor for Oracle Lite, and links it to Oracle databases and other enterprise databases via ODBC/JDBC. For many years, Oracle did not focus on Oracle Lite sales, and the product lost market share to SQLAnywhere. More recently, Oracle has begun to evangelize Oracle Lite to application developers and enterprise customers needing a mobile solution. The product also serves as an embedded database, supporting devices as diverse as industrial equipment and vending machines.
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