Lubomir Bic, Robert L. Hartmann (auth.), Prof.Dr. H.-O.'s Database Machines: International Workshop Munich, September PDF

By Lubomir Bic, Robert L. Hartmann (auth.), Prof.Dr. H.-O. Leilich, Dr. M. Missikoff (eds.)

ISBN-10: 3540129596

ISBN-13: 9783540129592

ISBN-10: 3642694195

ISBN-13: 9783642694196

The foreign Workshop on Database Machines in Munich is the 3rd of its sort, preceeded by way of the conferences in Florence (Sept. eighty one) and San Diego (Sept. 82). The workshop is aimed toward delivering an interchange of principles and adventure on computers designed to accomplish database operations extra successfully than common function desktops with a software program database administration approach. Many proposals were released in the past 10 years, yet now numerous platforms were outfitted and essentially carried out and a few are even commercially to be had, in order that war of words with the genuine international is beginning to ensue. the types of query which come up in this part of coming to adulthood are these concerned with evaluate and dimension. The emphasis of the workshop is hence on functionality assessment and the respective modelling strategies and method. facts circulation and different new subject matters (including algorithms) also are handled with appreciate to functionality and potency. we're joyful in an effort to contain a few papers on current advertisement items - from either the clothier and the consumer viewpoints. we are hoping to inspire severe reviews during this box and feature prepared a consultation with the name "Where Database Machines Are Going" - to be by means of a panel dis~ussion.

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ACM'76 Houston, Texas, Oct. 1976, pp. -S. (1976): The Entity-Relationship Model - Toward a Unified View of Data. ACM TOOS 1,1(1976), pp. 9-36 CODD, E. F. (1970): A Relational Model of Data for Large Shared Data Banks. CACM 13,6(1970), pp. 377-387 38 The crucial point with respect to performance, however, is whether intermediate results can be kept in internal buffers or must be stored on disk during query execution. In the first case we can achieve the theoretical speed also in practice; otherwise there might be heavy performance degradations caused by disk accesses.

In the the database profile we logical structure of relational database include the parameters a the most database. As we important parameters which characterize are dealing which we are: (dl) the number of relations (d2) the cardinality of each relation and its tuple size with a consider (d3) the number of indices (directory) and attributes indexed In the query profile we include the external parameters characterizing the user's interaction with the system. The most important parameters which we distinguish here are subdivided into the following categories: (ql) types of queries and related selectivity factors) (q2) query distribution function (q3) query arrival rate With regard to query types (ql), as a number of studies with naiv users have indicated [REI81), considerable complexity system resources.

RARCHY ( )I H ) LOGICAL EXECUTION SCHEDULES (le s) + LOGICAL EXECUTION NETWORK (LEN) ALLOCATE ABSTRACT PROCESSORS + ABSTRACT PROCESSOR HI~RARCHY (A PH) /18S a + I LENa IMPLEMENT PHYSICAL EXECUTION SCHEDULES (pes) + PHYSICAL EXECUTION NETWORK (PEN) PHYSICAL PROCESSORS + PHYSICAL PROCESSOR HIERARCHY (P P H) Figure 1: Multilevel specification of database architectures this graph becomes the physical execution network (PEN). To illustrate our specification technique of a DBS. A functional decomposition of is illustrated in figure 2.

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Database Machines: International Workshop Munich, September 1983 by Lubomir Bic, Robert L. Hartmann (auth.), Prof.Dr. H.-O. Leilich, Dr. M. Missikoff (eds.)

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