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Multiple database instances and types  RSS feed

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I need to access and update multiple instances of database and different types of databases(Sybase and Oracle) with in single tranaction. The DB access should be highly secured(i.e, the password of the DB schema shouldn't be accessible to anyone else). The number of database connections are really high(nearly 100 connections or schema per transaction). When a user gives an instruction to change a value, the application should update the value in all the database schemas. What is the most scalable way to do this? using DataSource(as in J2EE) or regular JDBC connections??
Thanks in advance
[ January 19, 2004: Message edited by: Padmaja Prasad ]
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