What is the main use of pooled talbe and where are they use?

Hi gus:
         Can somebody tell me what is the main use of pooled table and where are they use,thanks!
        Regards
         Jerry
Moderator message - Please search before asking - post locked
Edited by: Rob Burbank on Sep 1, 2009 9:11 AM

Hi,
Table pools are special table types in the ABAP Dictionary. The data from several different tables can be stored together in a table pool or table cluster. Tables assigned to a table pool or table cluster are referred to as pooled tables or cluster tables.
This table are similar to the CLUSTER table types but these work on "LINEAR SEARCH" while CLUSTER TABLE uses "BINARY SEARCH to retrieve the data from the various tables and thsi is mainly used in the logical databases "LDB's" used in HR or ABAP-HR.
A table in the database in which all records from the pooled tables assigned to the table pool are stored corresponds to a table pool.
The definition of a pool consists essentially of two key fields (Tabname and Varkey) and a long argument field (Vardata).
Table Clusters Several logical data records from different cluster tables can be stored together in one physical
record in a table cluster.
A cluster key consists of a series of freely definable key fields and a field (Pageno) for distinguishing continuation records. A cluster also contains a long field (Vardata) that contains the contents of the data fields of the cluster tables for this key. If the data does not fit into the long field, continuation records are created. Control information on the structure of the data string is still written at the beginning of the Vardata field.
Regards,
Samad.

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