tansaparent, pooled & cluster table names

[Former Member]

Can anybody tell me some tansaparent, pooled & cluster table names? How can we find that table is tansaparent, pooled & cluster table ?

Regards,

swathi.

[Former Member]

hi swathi,

<b>Pooled table</b>

A database table defined in the ABAP Dictionary whose database instance is assigned to more than one table defined in the ABAP Dictionary. Multiple pool tables are assigned to a table pool in the database. The key fields of a pool table have to be character-type fields. The table pool's primary key consists of two fields: TABNAME for the name of a pool table, and VARKEY for the interdependent contents of the key fields in the corresponding pool table. The non-key fields of the pool table are stored in compressed format in their own column, called VARDATA, of the table pool. The only way to access pool tables is by using Open SQL. Joins are not allowed.

<b>Table Pool</b>

Database table in the database that contains the data of several pool tables.

<b>Cluster Table</b>

Database table defined in the ABAP Dictionary, whose version on the database is not only assigned to one table defined in the ABAP Dictionary. Several cluster tables are assigned to a table cluster in the database. The intersection of the key fields of the cluster tables forms the primary key of the table cluster. The other columns of the cluster tables are stored in compressed form in a single column VARDATA of the table cluster. You can access cluster tables only via Open SQL, and only without using joins.

<b>Table Cluster</b>

Database table in the database that contains the data of several cluster tables.

Note: Never mix up with a database table that has the necessary structure for storing data clusters in database tables and in the shared memory. Those are called INDX-type, with reference to the database table INDX supplied by SAP. Data clusters are groupings of data objects for transient and persistent storage in a selectable storage medium. A data cluster can be processed using the statements IMPORT, EXPORT, and DELETE FROM.

1) T040, T040A--pooled

2) BSEG, BSES---->cluster

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

you can refer to the link http://help.sap.com/saphelp_nw04/helpdata/en/cf/21f083446011d189700000e8322d00/content.htm for standard documentation.

one kind request swathi, this type of questions is already asked in the forum.

Search the forum before asking questions.

Regards...

Arun.

Reward points if useful.

[seshatalpasai_madala]

Hi,

When you open the table in SE11, there you can see if the table is Transperent table or Cluster table or Pooled table.

The Label before the table field will show you that.

SPFLI can be an example for Transparent table.

ATAB is an example for Pooled table

AABLG is an example of Cluster table.

Regards,

Sesh

Regards,

Sesh

[suredarreddy_pulimamidi]

goto se11 and give table name DD02L(all tables are stored in this) see table records in that give table category pooled or cluster or transparent.

for transparent.:MARA,VbAK.etc

cluster:BSEG,MSEG.

pooled:A0006..

<b>Reward points if helpful </b>

[Former Member]

<b>I. Transparent tables</b> (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.

<b>II. Pool Tables</b> (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

<b>III. Cluster Tables</b> (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

<b>IV. Buffered Tables</b> (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

regards,

srinivas

<b>*reward for useful answers*</b><b></b>

[Former Member]

Hi,

Pool table

A database table defined in the ABAP Dictionary whose database instance is assigned to more than one table defined in the ABAP Dictionary. Multiple pool tables are assigned to a table pool in the database. The key fields of a pool table have to be character-type fields. The table pool's primary key consists of two fields: TABNAME for the name of a pool table, and VARKEY for the interdependent contents of the key fields in the corresponding pool table. The non-key fields of the pool table are stored in compressed format in their own column, called VARDATA, of the table pool. The only way to access pool tables is by using Open SQL. Joins are not allowed.

Table Pool

Database table in the database that contains the data of several pool tables.

Cluster Table

Database table defined in the ABAP Dictionary, whose version on the database is not only assigned to one table defined in the ABAP Dictionary. Several cluster tables are assigned to a table cluster in the database. The intersection of the key fields of the cluster tables forms the primary key of the table cluster. The other columns of the cluster tables are stored in compressed form in a single column VARDATA of the table cluster. You can access cluster tables only via Open SQL, and only without using joins.

Table Cluster

Database table in the database that contains the data of several cluster tables.

Note: Never mix up with a database table that has the necessary structure for storing data clusters in database tables and in the shared memory. Those are called INDX-type, with reference to the database table INDX supplied by SAP. Data clusters are groupings of data objects for transient and persistent storage in a selectable storage medium. A data cluster can be processed using the statements IMPORT, EXPORT, and DELETE FROM

This link also helps you...

http://help.sap.com/saphelp_nw04/helpdata/en/cf/21f083446011d189700000e8322d00/content.htm

Check out these threads

EXAMPLES

http://help.sap.com/saphelp_nw04/helpdata/en/cf/21f083446011d189700000e8322d00/content.htm

Some of List cluster tables

AUAA

AUAB

AUAO

AUAS

AUAT

AUAV

AUAW

AUAY

BSEC

BSED

BSEG

BSES

BSET

CDPOS

Some of list Pooled tables

A001

A004

A005

A006

A007

A009

A010

A012

A015

A016

A017

A018

A019

A021

A022

A023

A024

A025

A026

A028

A030

A032

A044

A045

A046

A047

A049

A051

A052

A053

A054

A058

A059

A060

A061

A062

A063

A400

A401

Regards,

Priyanka.

[Former Member]

Hi,

Check out the table DD02l, there we have a field called tablclass , which says whether the table is transpat\rent or pool or clustered table, to view the desciprion all the tables go to DD02T.

regards,

Navneeth K.