In recent years, there has been tremendous interest in research that applies machine learning to database systems. Being one of the most complex components of a DBMS, query optimizers could benefit from adaptive policies that are learned systematically from the data and the quer...
This does not distinguish between tasks of operating systems and DBMSs. In this paper, we claim that building from scratch a green query processors and revisiting existing ones pass through 4-steps procedure: (1) establishment of a deep audit that allows understanding the query processor ...
Section 2 describes OGSA-DAI, which provides data access capabilities in service-based Grids. Section 3 contains the principal technical contributions of the paper — a detailed description of how the OGSA-DQP engine has been realised, using services both as architectural components in the design ...
The Floun-der IR emitted by the hash join is translated to the machine assembly shown in Fig.4b. Several abstractions that were used during IR generation are now replaced by machine-level concepts. For example, the machine assembly uses processor registers such as ...
The package DBMS_ODCI contains a function estimate_cpu_units to help get the CPU and I/O cost from input consisting of the elapsed time of a user function. estimate_cpu_units measures CPU units by multiplying the elapsed time by the processor speed of the machine and returns the approximate...
That is why we use this pattern in combination with the publish-subscribe pattern to let each implementation of a certain task correspond to a separate actor. Mediator Pattern. The mediator [30] pattern is able to reduce coupling between software components that interact with each other, and to...
Most of the CQL language is operational in the STREAM system. We present the structure of CQL's query execution plans as well as details of the most impor- tant components: operators, interoperator queues, synopses, and sharing of components among multiple operators and queries. Examples through...
components, data structures and the like that perform particular tasks or implement particular abstract data types. Moreover, those skilled in the art will appreciate that the invention may be practiced with other computer system configurations, including hand-held devices, multi-processor systems, micr...
A DBMS may define an external table in response to receiving a DDL (Data Definition Language) statement that describes the external table. The DDL statement specifies one or more columns for the external table (“DBMS table columns”) and an external data source of the external table, such as...
areas10aand12a, respectively. Operating in conjunction with the database8are wrappers14aand14bthat operate to map the hierarchical data in the XML document into relational tables. Although the wrapper is described here for use with the IBM DB2® relational database management system (DBMS), the...