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The aim of the paper is to introduce techniques in order to tune sequential in-core sorting algorithms in the frameworks of two applications. The first application is parallel sorting when the processor speeds are not identical in the parallel system. The second application is the Zeta-Data Project (Koskas , 2003) whose aim is to develop novel algorithms for databases issues. About 50% of the work done in building indexes is devoted to sorting sets of integers. We develop and compare algorithmsdoi:10.1016/j.future.2006.02.014 fatcat:7ghwz745djda5fgs37wpdheadi