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PowerBuilder® 9: Internet and Distributed Application Development by John D. Olson, Bill Green

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Database Access

Database interaction likely will comprise a large portion of your n-tier application, so you need options to trace and diagnose issues related to database operations. In a distributed architecture, the database “client” is really the application server itself rather than an end user. This environment can be considerably more complex than in a client/server application because the application server (re)uses just a few persistent physical database connections to service disparate requests across multiple end users. In terms of tracing database operations executed within PowerBuilder components, you can use a PowerBuilder-specific tracing option as well as specific tracing tools and options provided by the vendor of the back-end ...

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