What is transparent, cluster and pool table? Where and when we use these
tables?
Transparent Table : Exists with the same structure both in dictionary as
well as in database exactly with the same data and fields.
Pooled Table : Pooled tables are logical tables that must be assigned to a
table pool when they are defined. Pooled tables are used to store control data.
Several pooled tables can be cominied in a table pool. The data of these pooled
tables are then sorted in a common table in the database.
Cluster Table : Cluster tables are logical tables that must be assigned to a
table cluster when they are defined. Cluster tables can be used to strore
control data. They can also be used to store temporary data or texts, such as
documentation.
Could anyone tell me what is the major difference between Standard tables,
Pooled tables and Clusterd Tables?
A transparent table is a table that stores data directly. You can read these
tables directly on the database from outside SAP with for instance an SQL
statement.
Transparent table is a one to one relation table i.e. when you create one
transparent table then exactly same table will create in data base and if is
basically used to store transaction data.
A clustered and a pooled table cannot be read from outside SAP because
certain data are clustered and pooled in one field.
One of the possible reasons is for instance that their content can be
variable in length and build up. Database manipulations in Abap are limited as
well.
But pool and cluster table is a many to one relationship table. This means
many pool table store in a database table which is know as table pool.
All the pool table stored table in table pool does not need to have any
foreign key relationship but in the case of cluster table it is must. And pool
and cluster table is basically use to store application data.
Table pool can contain 10 to 1000 small pool table which has 10 to 100
records. But cluster table can contain very big but few (1 to 10) cluster
table.
For pool and cluster table you can create secondary index and you can use
select distinct, group for pool and cluster table. You can use native SQL
statement for pool and cluster table.
A structure is a table without data. It is only filled by program logic at
the moment it is needed starting from tables.
A view is a way of looking at the contents of tables. It only contains the
combination of the tables at the basis and the way the data needs to be
represented. You actually call directly upon the underlying tables.
