The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The optimal selection of secondary indexes asks for the quantitative evaluation of the performance of a number of candidate secondary indexes in order to determine the particular combination of indexes which satisfies the anticipated user transactions at a minimal cost. Previous studies determine the optimal selection by assuming that the cost of satisfying a query using a secondary index is not affected...
We present polynomial time algorithms for minimizing and testing equivalence of what we call "fan-out free" queries. The fan-out free queries form a more general and more powerful subclass of the conjunctive queries than those previously studied, as they can be used to express questions about transitive properties of databases, questions that are impossible to express if one operates under...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.