Answer to Question 1
Relational database technology has steadily improved since the 1970s and now provides the backbone for ERP systems. However, ERP systems have two different, conflicting uses of databases. First and foremost, they must efficiently process a potentially huge number of transactions. In contrast to this, transaction data must be summarized and used for generating and disseminating reports to a large number of users. Since these are two different purposes, it is usually the case that an ERP system has multiple databases behind them; some for transaction processing and some for data analysis and reporting. The most common relational databases used with ERP systems are Oracle, DB2, Sybase, and SQL Server.
Answer to Question 2
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