What are the update types possible, Computer Engineering

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What are the update types possible?

The following update types are possible:

Update type A: The matchcode data is updated asynchronously to database changes.
Update type S: The matchcode data is updated synchronously to database alters.
Update type P: The matchcode data is updated by the application program.
Update type I: Access to the matchcode data is managed using a database view.
Update type L: Access to the matchcode is achieved by calling a function module.

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