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table

plzz give me some example of pooled table,cluster table and transparent table? plzz tell

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  • author's profile photo Former Member
    Former Member
    Posted on Jan 05, 2008 at 12:17 PM

    Hi,

    The transparent tables are: - which can store transactional data.

    VBAK,VBAP, VBRK , VBRP,

    Clustered tables can store the longdata like documentation.

    STXL, STXH,

    Pooled tables can store information regarding program and screen flows.

    BSEG

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  • author's profile photo Former Member
    Former Member
    Posted on Jan 05, 2008 at 12:28 PM

    Hi Srinath

    Hope it will help you.

    Please reward pts if help.

    Deepanker

    The following are the table types used in SAP :

    Transparent Tables

    There is a physical table on the database for each transparent table.

    The names of the physical table and the logical table definition in the

    ABAP/4 Dictionary agree. All the business and application data is store

    in transparent tables.

    Pooled table

    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.

    Cluster table

    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 category. This permits object-by-object storage or

    object-by-object access. In order to combine tables in clusters, at

    least part of the keys must agree. Several cluster tables are stored in

    one corresponding table on the database.

    I. 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.

    Tables Documentation

    https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/25c1f5d1-0901-0010-d495-e96d02a0cb01

    Please reward pts if help.

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  • author's profile photo Former Member
    Former Member
    Posted on Jan 05, 2008 at 12:32 PM

    Hi,

    Pooled tables will stores the information about data and as well program and screen flows.

    BSEG

    Normally not recommended to use BSEG table, instead of this we use BSAK,BSIK,BSID,BSAD tables...

    Clustered tables will stores the large amount of data.

    STXL, STXH,

    The transparent tables are: - which will stores the transactional data.

    EKKO,EKPO,EKET,KNA1.....

    Thanks,

    Murali

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