Methods Citations. Tables and Topics from this paper. Database Information engineering. Citation Type. Has PDF. Publication Type. More Filters. Configuring Database Query Languages.
View 2 excerpts, cites background and methods. In this paper, we study the data placement problem from a reorganization point of view. EEective placement of the declustered fragments of a relation is crucial to the performance of parallel … Expand.
View 1 excerpt, cites methods. A survey of schema versioning issues for database systems. View 1 excerpt. The scn. In fact, one [2]. Any author writing a replication paper must keep in panelist observed that in it will be possible to buy mind this simple fact. The feeling was that lots of transaction rates. More typical applications require models have been invented, and lots more will presumably transactionsper secondand will need only a small portion be discovered, all differing in minor ways.
The feeling of of a chwp machine. This reinforces the same feeling from the rcndcring further research in this area of questionable Laguna Beach participants. In a sense Laguna Beach declared traditional con- currency control a dead topic; Vienna extended this death Another topic with 3 negative votes was transactions warranl to single site DBMSs. Specifically, the panelists were negative on algorithms supporting two-phase commit The third topic received with disfavor was performance in a heterogeneousdistributed data base environment in studies of artificial environments.
Two examples were which the various local DBMSs do not support a prepare heavily cited. This requires sophisticated and expensive algo- of a few megabytes or less which were fronted by even rithms to simulate this capability outside the DBMS. The smaller main memory cacheswere scorned. Current work- feeling of the panelists was that XA would force all vcn- stations routinely come with 32 Mbytes of memory, and dors of data managers to support a common distributed performancestudies that assumea cache size considerably transaction capability, and render this problem irrelevant.
Hcncc, performance studies should use technology commit would be present in such application shops. Hence, this problem is not relevant to any real world situa- Second,Jim Gray once formulated to following law: tion. In a well-designed data base,the probability Two final topics deserve comment. First, the panelists of waiting as a result of a lock felt that there is a limited commercial market for persistent rcqucst is less than 0. As such, researchers humans sitting idle waiting for lock releases.
A data base should focus their energy on problem areas with a higher administrator faced with this situation will redesign his possibility of product penetration. The last topic was the study of concurrency control and There have been a large number of papersrecently pub- crash recovery systems that supported less than ACID properties.
Hence, there is limited applicability for such for a load that will never be experiencedin the real world. Another unappealing arca was algorithms for updating multiple topics of objects in distributed data bases. There 4. Moreover, most entail setting read locks at more than one site and write sively addressedin the intervening four years, and have dropped off the list of things requiring attention.
Only user locks at less than all sites. Quorum and majority consen- interfaces remains on the list. In addition, work on sus algorithms have this property. However, a read com- mand need be sent to only one site, and a single lock the negative topics has largely ceased.
However, we must now ponder the Vienna results in El Abbadi. Management of Data, San Francisco, Ca. On the other hand, the problems identified by the panel as important have the PI Wachter, H. Hence, our community Publishers, Redwood City, Ca. It is, of course, safer to take the traditional path.
As a community, we should consciously break out of this mold. The important problems from the table appear to have largely come from applying this advice. The panel followed a similar format to that used at Laguna Beach four years earlier, and four of the five panelists attended the earlier conference.
As such, we contrast the recommendations of the Laguna Beach… Expand. View Paper. Save to Library Save. Create Alert Alert. Share This Paper. Background Citations. Methods Citations. Tables and Topics from this paper. Database Information engineering. Citation Type. Has PDF. Publication Type. More Filters. Configuring Database Query Languages. View 2 excerpts, cites background and methods.
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