“…Thus, it provides slightly less accurate results, but offers in return a sharp reduction in computation time. We find in this family methods such VA-File [8] and its variants [24], [30], the LSH methods [15], [17] and its variants [9], [13], [14], [25], BitMatrix [10], KRA +-Block [11], multi-dimensional inverted index [22], etc. Unluckily, most of indexing and search structures available today have several limitations including scalability:1) a relatively large computation time 2) limiting memory 3) degradation of research quality.…”