Online processing typically involves transaction requests entered from terminals connected directly to the computer, transaction results displayed at the terminal, multiple requests from multiple sources, and sharing one copy of a program among multiple users. Additionally, online processing is immediate. The processing of large volumes of transactions from multiple online users requires fast response time. Online programs use data communications DML statements and can include database DML statements.
The following figure illustrates the flow of a typical online application. EMPDISP retrieves information for an operator-specified employee ID. Output to the terminal consists of DEPARTMENT, EMPLOYEE, JOB, and OFFICE information.
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