The many-to-many model multithreading model multiplexes multiple user-level threads to a smaller or equal number of kernel threads.
In systems analysis, a many-to-many relationship exists as a type of cardinality that refers to the connection between two entities, say, A and B, where A may contain a parent instance for which there exist many children in B and vice versa. When you need to show a many-to-many relationship between two or more tables, the simplest way exists to use a Junction Table. A Junction table in a database, also directed to as a Bridge table or Associative Table, bridges the tables together by referencing the primary keys of each data table.
In web application frameworks such as CakePHP and Ruby on Rails, a many-to-many relationship between entity classes described by logical model database tables exists sometimes directed to as a HasAndBelongsToMany (HABTM) relationship.
Hence, many-to-many model multithreading model multiplexes multiple user-level threads to a smaller or equal number of kernel threads.
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