Russian translation: растровая фильтрация в параллельных схемах запросов
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GLOSSARY ENTRY (DERIVED FROM QUESTION BELOW)
English term or phrase:
bitmap filtering in parallel query plans
растровая фильтрация в параллельных схемах запросов
English to Russian translations [PRO] Tech/Engineering - Computers: Software / SQL Server
English term or phrase:bitmap filtering in parallel query plans
Документация по SQL Server.
SQL Server uses the Bitmap operator to implement bitmap filtering in parallel query plans. Bitmap filtering speeds up query execution by eliminating rows with key values that cannot produce any join records before passing rows through another operator such as the Parallelism operator. A bitmap filter uses a compact representation of a set of values from a table in one part of the operator tree to filter rows from a second table in another part of the tree. By removing unnecessary rows early in the query, subsequent operators have fewer rows to work with, and the overall performance of the query improves. The optimizer determines when a bitmap is selective enough to be useful and in which operators to apply the filter.