Transaction Requirements
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All applications must provide one transaction handle for each transaction to be accessed. A transaction handle is a long pointer that is used in API functions to start a transaction and to reference it in subsequent API calls. The InterBase header file, ibase.h, contains a #define useful for declaring transaction handles.
When starting a transaction, optional transaction characteristics, such as access method and isolation level, can be passed to the start-up call through a transaction parameter buffer (TPB). Usually, one TPB is set up for each transaction, although transactions with the same operating characteristics can also share a TPB.