How light TP monitors allow distributed applications
Explain how light TP monitors allow distributed applications based on RPC to have transaction properties.
Expert
A light TP-Monitor extends the transactional capabilities of a database beyond the database domain. It gives the mechanisms and tools essential to build applications in which transactional guarantees are provided. The TP-monitor tries to encapsulate the services provided within transactional brackets. This entails RPC augmented with:
Transactional RPC: Implements RPC and enforces scheduling operations, transactional semantics accordingly.
Transaction manager: runs 2PC and takes care of the recovery operations.
Log manager: records each and every changes done by transactions so that a consistent version of the system can be reconstructed in case of failures.
Lock manager: a generic mechanism regulating access to shared data outside the resource managers.
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