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Properties of Transactions<br />
� Consistency:<br />
� transactions retain internal consistency of the data base<br />
� many kinds of integrity<br />
� unique keys<br />
� referential f ti l integrity i t it<br />
� fixed relationships hold<br />
� responsibility belongs to the programmer, not to the data<br />
base<br />
� if each transaction is consistent, then all sequences of<br />
transactions are as well<br />
Transactions<br />
© 2009 Universität Karlsruhe, System Architecture Group 40