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The traditional architecture for a DBMS engine has the recovery,
concurrency control and access method code tightly bound
together in a storage engine for records. We propose a different
approach, where the storage engine is factored into two layers
(each of which might have multiple heterogeneous instances). A
Transactional Component (TC) works at a logical level only: it
knows about transactions and their ―logical‖ concurrency control
and undo/redo recovery, but it does not know about page layout,
B-trees etc. A Data Component (DC) knows about the physical