Intending to develop a tool which aims to support the physical design of relational databases can not be done without considering the problem of index selection. Generally the problem is split into a primary and secondary index selection problem and the selection is done per table. Whereas much attention has been paid on the selection of secondary indices relatively less is known about the sele...

The Index Selection Problem (ISP) is an important element of research in the field of optimization of relational database systems. Commonly used commercial tools are based on a methodology that enables tables indexing for independent SQL queries. The article presents an original method, based on a genetic algorithm, for indexing tables for groups of queries in a relational database (MDI). Condu...

breeding based on selection indices is an effective method for improving complex traits such as yield. to assess the efficiency of different selection methods, 50 genotypes of tall fescue (festuca arundinace) were evaluated under two moisture conditions including full irrigation (normal environment) and deficit irrigation (stress environment). the experiment was conducted according to a randomi...