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- Block_nested_loop abstract "A block-nested loop (BNL) is an algorithm used to join two relations in a relational database.This algorithm is a variation on the simple nested loop join used to join two relations and (the "outer" and "inner" join operands, respectively). Suppose . In a traditional nested loop join, will be scanned once for every tuple of . If there are many qualifying tuples, and particularly if there is no applicable index for the join key on , this operation will be very expensive.The block nested loop join algorithm improves on the simple nested loop join by only scanning once for every group of tuples. For example, one variant of the block nested loop join reads an entire page of tuples into memory and loads them into a hash table. It then scans , and probes the hash table to find tuples that match any of the tuples in the current page of . This reduces the number of scans of that are necessary.A more aggressive variant of this algorithm loads as many pages of as can be fit in the available memory, loading all such tuples into a hash table, and then repeatedly scans . This further reduces the number of scans of that are necessary. In fact, this algorithm is essentially a special-case of the classic hash join algorithm.The block nested loop runs in I/Os where is the number of available pages of internal memory and and is size of and respectively in pages. Notethat block nested loop runs in I/Os if fits in the available internal memory.".
- Block_nested_loop wikiPageExternalLink bnl-bka-optimization.html.
- Block_nested_loop wikiPageID "7806581".
- Block_nested_loop wikiPageRevisionID "552544041".
- Block_nested_loop hasPhotoCollection Block_nested_loop.
- Block_nested_loop subject Category:Join_algorithms.
- Block_nested_loop type Abstraction100002137.
- Block_nested_loop type Act100030358.
- Block_nested_loop type Activity100407535.
- Block_nested_loop type Algorithm105847438.
- Block_nested_loop type Event100029378.
- Block_nested_loop type JoinAlgorithms.
- Block_nested_loop type Procedure101023820.
- Block_nested_loop type PsychologicalFeature100023100.
- Block_nested_loop type Rule105846932.
- Block_nested_loop type YagoPermanentlyLocatedEntity.
- Block_nested_loop comment "A block-nested loop (BNL) is an algorithm used to join two relations in a relational database.This algorithm is a variation on the simple nested loop join used to join two relations and (the "outer" and "inner" join operands, respectively). Suppose . In a traditional nested loop join, will be scanned once for every tuple of .".
- Block_nested_loop label "Block nested loop".
- Block_nested_loop sameAs m.026dpyq.
- Block_nested_loop sameAs Q4927199.
- Block_nested_loop sameAs Q4927199.
- Block_nested_loop sameAs Block_nested_loop.
- Block_nested_loop wasDerivedFrom Block_nested_loop?oldid=552544041.
- Block_nested_loop isPrimaryTopicOf Block_nested_loop.