We present a new algorithm for relational equi-join. The algorithm is a modification of merge join but promises superior performance for medium-size relations. In many cases, it even compares favorably with hybrid hash join.

most sweet cherry (prunus avium l.) cultivars are self-incompatible and have problems of ‎fertilization and fruit set. to produce commercial crops they need compatible and suitable ‎pollinizers. the compatibility of “zarde daneshkadeh”, “protiva”, “sorati lavasan”, “haj-yosefy” ‎and “meshkin shahr” cultivars with “shoa-o-saltaneh” as seed parent studied in a randomized ‎complete block design (r...

Uptil now most of the work is done on image, video, audio.but today the Database watermarking becomes the research topic because of the increasing the use of relational database systems. Which deals with the legal issue of copyright protection of database systems. .Watermarking is an information hiding technique which is used to embed a mark within some host content. In this paper,we have focus...

Our aim is to show that it is impossible to find a bound for the power of the first fixed point of the aleph function. 0 Introduction אα is called a fixed point of the א-function if אα = α. It is called the first fixed point if α is the least ordinal such that אα = α. More constructive, the first repeat point of the א-function is the limit of the following sequence א0,אא0 ,אאא0 ,אאאא0 , . . . T...

This paper extends earlier research on hash-join algorithms to a multiprocessor architecture. Implementations of a number of centralized join algorithms are described and measured. Evaluation of these algorithms served to verify earlier analytical results. In addition, they demonstrate that bit vector filtering provides dramatic improvement in the performance of all algorithms including the sor...

Adaptive query processors make decisions as to the most effective evaluation strategy for a query based on feedback received while the query is being evaluated. In essence, any of the decisions made by the optimizer (e.g., on operator order or on which operators to use) may be revisited in an adaptive query processor. This paper focuses on changes to physical operators (e.g., the specific join ...

Oxidative stress (OS), which has been implicated in pathogenesis of many acute and chronic diseases, plays an important role in diverse neurological disorders including depression and anxiety. OS is caused by a large amount of reactive oxygen species or impaired enzymatic or non-enzymatic defense against it. OS has been suggested to contribute to etiology of mentioned disorders. This review int...