POOL & CLUSTER TABLEs

[Former Member]

Hi Experts,

Can you send me some example tables for pool and cluster tables..

And where exactly you use these tables in real time..

Kindly reply me as early as possible

Thanks in advance

Santosh

[Former Member]

hi,

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

check the below sap link

http://help.sap.com/saphelp_erp2005vp/helpdata/en/cf/21f0d1446011d189700000e8322d00/frameset.htm

~~Guduri

[Former Member]

Hi santosh,

Go to se11

table DD02L-> Give TABCLASS as POOL or CLUSTER you will get a list of tables

Pooled and Cluster Tables

Table pools (pools) and table clusters (clusters) 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.

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.

Table Pools

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). A pool has the following structure:

Field

Data type

Meaning

Tabname

CHAR(10)

Name of pooled table

Varkey

CHAR (n)

Contains the entries from all key fields of the pooled table record as a string, max. length for n is 110

Dataln

INT2(5)

Length of the string in Vardata

Vardata

RAW (n)

Contains the entries from all data fields of the pooled table record as a string, max. length n depends on the database system used

If a pooled table record is saved, it is stored in the table pool assigned. The name of the pooled table is written to the field Tabname. The contents of all key fields of the pooled table are written as a string to field Varkey and the contents of all data fields as a string to field Vardata. The length of the string stored in Vardata is entered in field Dataln by the database interface.

Due to the structure of a table pool, there are certain restrictions on the pooled tables assigned to it. The name of a pooled table may not exceed 10 characters. Since Varkey is a character field, all key fields of a pooled table must have character data types (for example, CHAR, NUMC, CLNT). The total length of all key fields or all data fields of a pooled table must not exceed the length of the Varkey or Vardata field of the assigned 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. 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

*

First key field

CLKEY2

*

Second key field

...

...

...

CLKEYn

*

nth key field

Pageno

INT2(5)

Number of the continuation record

Timestamp

CHAR(14)

Time stamps

Pagelg

INT2(5)

Length of the string in Vardata

Vardata

RAW (n)

Contains the entries from the data fields of the assigned cluster tables as a string, max. length n depends on the database system used

The records of all cluster tables with the same key are stored under one key in the assigned table cluster. The values of the key fields are stored in the corresponding key fields of the table cluster. The values of all data fields of the assigned cluster tables are written as a string to the Vardata field of the table cluster. Besides the actual data values, the data string contains information on the structure of the data and which table it comes from. If the string exceeds the maximum length of the Vardata field, a continuation record is written with the same key values. The continuation records for a key are distinguished by their value in field Pageno. The actual length of the string in the Vardata field is stored in the Pagelg field by the database interface.

You need the structural information stored in the ABAP Dictionary to read the data from a pooled table or cluster table correctly. These tables can therefore only be processed using Open SQL with the cluster interface, and not with Native SQL directly in the database.

In Repository informatino SE84 goto ABAP Dictonary -> Other Objects -> Pooled and clustered tables -> And then execute. It will give the list of available pooled/clustered tables.

For further reference check the SAP help document...

http://help.sap.com/saphelp_erp2005/helpdata/en/cf/21ea0b446011d189700000e8322d00/frameset.htm

regards,

keerthi