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Editing and validation of data occur
at the time the transactions are submitted by users.
Batch processing occurs without user interaction. Batches of transactions are fed
from source files to the operational system. Errors are typically reported in exception
files or logs and are reviewed by users or operators later on. Virtually all OLTP systems
have a batch component: jobs that can execute in off-peak hours for reporting,
payroll runs, posting of accounting entries, and so on.
Many large companies have batch-oriented mainframe systems that are so thoroughly
embedded in the corporate infrastructure that they cannot be replaced or
removed. A common practice is to ???frontend??? these legacy systems with OLTP systems
that provide more modern interfaces. Users interact with the OLTP system to
enter transactions. Batch files are extracted from the OLTP system and fed into the
downstream legacy applications.
Once the batch processing is done, extracts are produced from the batch systems and
are used to refresh the OLTP systems.


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