Where does we use Cluster & Pooled Tables

can you please tell where does we actually use the Cluster and pooled tables...and what is the main purpose of the cluster and pooled
Thankyou for your time
Bhaskar

Pooled tables can be used to store control data (e.g. screen sequences, program parameters or temporary data). Several pooled tables can be combined to form a table pool. The table pool corresponds to a physical table on the database in which all the records of the allocated pooled tables are stored.
A001
A004
A005
A006
A007
A009
A010
A012
A015
A016
A017
A018
A019
A021
A022
Cluster tables contain continuous text, for example, documentation. Several cluster tables can be combined to form a table cluster. Several logical lines of different tables are combined to form a physical record in this table type. This permits object-by-object storage or object-by-object access. In order to combine tables in clusters, at least parts of the keys must agree. Several cluster tables are stored in one corresponding table on the database.
AUAA
AUAB
AUAO
AUAS
AUAT
AUAV
AUAW
AUAY
BSEC
BSED
BSEG
BSES
BSET
CDPOS
Raja T

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Cluster,pooled tables

Hi all,
What is the difference of Cluster and pooled tables.and the specific applications.do we get the need to create the pooled tables in implmentations.
u.khan.

Hai
Pooled tables. Pooled tables in the dictionary has a many-to-one relation with the table in database. Table in the database has the different name as in the dictionary. Pooled table are stored in table pool at the database level.
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. A table cluster has the following structure:
Field
Data type
Meaning
CLKEY1
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Second key field
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nth key field
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INT2(5)
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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.
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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.
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Go through the following Link
http://help.sap.com/saphelp_nw04/helpdata/en/cf/21f083446011d189700000e8322d00/content.htm
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Look at <a href="http://help.sap.com/printdocu/core/Print46c/en/data/pdf/BCDWBDIC/BCDWBDIC.pdf">BC - ABAP Dictionary</a>
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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.
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(screen sequences, program parameters, temporary data, continuous texts such as
documentation). All data of commercial relevance is stored exclusively in transparent tables!
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A table in the database in which all records from the pooled tables assigned to the table pool are
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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.
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I wanted to do join between cluster ,pooled and transparent tables but inner join won't allow to join between transparent or cluster tables or pooled tables . The requirements are that join should take place dynamically between transparent ,cluster ,pooled tables .I have written the Function module for joining multiple tables for transparent tables but unable to implement same for the transparent and cluster or pooled tables.How to handle the joining of tables between pooled or cluster and transparent tables kindly provide me the answer .
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My suggestion would be... if you want to retrieve the data between cluster tables and transparent tables.. its better to go for views instead of cluster tables then that would be easier for you to retrieve the data
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Reg : Cluster and pool tables

Hi All,
I think this has been asked previously.
Have a doubt, i think this area is kind of opaque.
This is the scenario, we have standard business suite systems now i am going to get the data into hana using SLT how do i handle cluster and pool tables. Do i bring in the declustered data?
I am aware that we can get the data from these tables into BW on hana, not sure if that is correct.
What are the best practice approach for these table classes.
How have you implemented these kind of scenarios.
Message was edited by: Tom Flanagan

Hello,
SLT Supports replication of non-Unicode to Unicode systems.
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Clustertable and pooled table

hi guru
which type of data is store in cluster table and pooled table?
what is relation between cluster and pooled table

Hi,
. Transparent tables (BKPF, VBAK, VBAP, KNA1, COEP)
· Allows secondary indexes (SE11->Display Table->Indexes)
· Can be buffered (SE11->Display Table->technical settings) Heavily updated tables should not be buffered.
II. Pool Tables (match codes, look up tables)
· Should be accessed via primary key or
· Should be buffered (SE11->Display Table->technical settings)
· No secondary indexes
· Select * is Ok because all columns retrieved anyway
III. Cluster Tables (BSEG,BSEC)
· Should be accessed via primary key - very fast retrieval otherwise very slow
· No secondary indexes
· Select * is Ok because all columns retrieved anyway. Performing an operation on multiple rows is more efficient than single row operations. Therefore you still want to select into an internal table. If many rows are being selected into the internal table, you might still like to retrieve specific columns to cut down on the memory required.
· Statistical SQL functions (SUM, AVG, MIN, MAX, etc) not supported
· Can not be buffered
IV. Buffered Tables (includes both Transparent & Pool Tables)
While buffering database tables in program memory (SELECT into internal table) is generally a good idea for performance, it is not always necessary. Some tables are already buffered in memory. These are mostly configuration tables. If a table is already buffered, then a select statement against it is very fast. To determine if a table is buffered, choose the 'technical settings' soft button from the data dictionary display of a table (SE12). Pool tables should all be buffered.
"Major difference betwen Standard tables,Pooled tables and Cluster Tables?
1.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.
2.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.
3.A clustered and a pooled table cannot be read from outside SAP because certain data are clustered and pooled in one field.
4.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.
5.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.
6.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.
7.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.
8.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.
9.A structure is a table without data. It is only filled by program logic at the moment it is needed starting from tables.
10.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.
'The table which store information about Structures and Tables are as follows:
DD02L - table properties
DD02T - table texts
DD03L - field properties
DD03T - field texts
Creating cluster/pool tables:
http://help.sap.com/saphelp_nw04/helpdata/en/cf/21f0b7446011d189700000e8322d00/content.htm
creating transparent tables
http://help.sap.com/saphelp_nw04/helpdata/en/cf/21eb6e446011d189700000e8322d00/frameset.htm
Thanks,
Reward If Helpful.

Where does we use Cluster & Pooled Tables

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