© 1998 FORWISS FORWISS Oracle Measurement Results Prof. Bayer, PhD Dipl.-Inform. Volker Markl Roland Pieringer

© 1998 FORWISS FORWISS Contents l Environment of the benchmark suite l Results of the measurements – Example measurement suite – Comparison of the operating systems SUN Solaris and Windows NT – Variation of the sizes of the tuples – Variation of the number of tuples – Variation of the number of restricted dimensions l Future Work

© 1998 FORWISS FORWISS Environment of the benchmark suite l Measures on two machines: – Compaq PC (4 Intel Processors, 200 MHz, 512 MB RAM) with Oracle – SUN Ultra 2 (2 Ultra Sparc Processors, 200 MHz, 1 GB RAM) with Oracle l Data uniformly distributed and created by a program l Elimination of cache side effects by NOCACHE

© 1998 FORWISS FORWISS Used indexes l UB: UB Tree (index that causes this meeting) l COMPOUND: concatenation of several indexes to get a multi dimensional index in Oracle as index only table implemented l MULT: secondary indexes on all index attributes l SCAN: no index, relation scan, in Oracle as full table scan

© 1998 FORWISS FORWISS Kinds of benchmarks l c% measurements: Q = (I 1,...,I n ) I k = 1 %..100 % I 1,..., I k-1, I k+1, I n = c % random starting point l Cube measurements: Q=(I 1,...,I n ) I i = 0%.. 100%, for i = 1,...,n fix starting point 20% 40% 60% 80% Q 20% Q 40% Q 60% Q 80%

© 1998 FORWISS FORWISS Results of the measurements l Complete benchmarks suite l Comparison of Windows NT and SUN Solaris l Variation of the size of tuples l Variation of the number of tuples l Variation of the number of restricted dimensions

© 1998 FORWISS FORWISS 20% measure with 5 restricted dimensions (250K tuples, tuple size 428 Byte)

© 1998 FORWISS FORWISS 35% measure with 5 restricted dimensions (250K tuples, tuple size 428 Byte)

© 1998 FORWISS FORWISS Cube measure (250K tuples, tuple size 428 Byte)

© 1998 FORWISS FORWISS Solaris - NT: 35% measure (125K tuples, 428 Byte tuple size) with SUN

© 1998 FORWISS FORWISS Solaris - NT: 35% measure (125K tuples, 428 Byte tuple size) with NT

© 1998 FORWISS FORWISS Comparison of tuple size l Intersection of compound and relation scan: – small tuples: about 10% – large tuples: about 8% l Intersection UB Tree and relation scan: – small tuples: about 65% – large tuples: about 47% l Decrease of performance of the relation scan: – small tuples: factor 4 – large tuples: factor 1.4

© 1998 FORWISS FORWISS Comparison of the number of tuples Cube measure (1M tuples, 228 Byte tuple size)

© 1998 FORWISS FORWISS Comparison of the number of tuples Cube measure (2M tuples, 228 Byte tuple size)

© 1998 FORWISS FORWISS Comparison of the number of tuples Cube measure (4M tuples, 228 Byte tuple size)

© 1998 FORWISS FORWISS Variation of the number of restricted dimensions Cube measure (250K tuples, 428 Byte tuple size)

© 1998 FORWISS FORWISS Variation of the number of restricted dimensions 35% measure (250K tuples, 428 Byte tuple size)