[DMDB] Notes on concurrency control

2026-07-27 21:29:09 +02:00 · 2026-07-26 12:49:35 +02:00
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 \subsection{Transaction Model}
 \inlinedefinition Some terms for Transaction model:
 \begin{itemize}
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 Conflicting operations are two operations on the same item with at least one of them being a write operation, such as $r_1[x] w_2[x]$ or $w_1[y] w_2[y]$.

 \subsubsection{History}
+\label{sec:tm-history}
 A history $H$ is a partially ordered $<_H$ sequence of operations from a set of transactions.
 If two operations are ordered within a transaction, they are equally ordered in the history.
 If two operations $p$ and $q$ conflict, then they are ordered with respect to each other ($p <_H q$ or $q <_H p$)