Answer Posted / eswar

Table Pools
===========
A table pool or table cluster should be used exclusively for
storing internal control information (screen sequences,
program parameters, temporary data, continuous texts such as
documentation). Data of commercial relevance is usually
stored in transparent tables.

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.

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.

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