Cluster and a Table

What is the difference between a Cluster and a Table?

Hi jack,
Have a look at below threads
Difference between cluster and transparent table.....
DIFFERENCE BETWEEN TRANSPARENT AND CLUSTER TABLES
Reward points if useful.
Regards,
Manoj.

Similar Messages

Cluster and transparent table

Hi
Can some one explain me what is meant by cluster and transparent table
Points will be rewarded.
Regards
Raghu Ram.

hi Raghu,
just make a search about this in the ABAP Forum, there are tons of threads about the topic, here is just the most recent example:
transparent vs pooled vs cluster tables
hope this helps
ec

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.
Includes cluster / pool tables, etc. (writes into transparent tables in SAP HANA system).
Regards,
Subbu

Can u create cluster and pooled tables in real time

hi
can u create cluster and pooled tables in real time.can u send data base tables name of above one.

Hai Anil
For creating cluster tables first u have to create table pool ...
create a table and specify the fields and other tecnical settings and
then Goto EXTRAS --> Change Table Category and selct the Pooled table and activate it...
Then Create another table And specify the required fileds and also the settings and then
Goto EXTRAS --> Change Table Category and selct the Cluaster table and in Delivery and
Maintainence Properties mention the Pooled table that u created and activate it...
Regards
Sreeni

Doubt on cluster and pooled tables

Dear experts
i kno how to create a cluster and pooled table ..
but in reality how a requirement comes to create a cluster or pooled table....
plz kindly explain in detailed
thanks in advace
somesh

Hello,
Hope the below link gives you an insight into how the pooled/cluster tables behave.
http://help.sap.com/saphelp_46c/helpdata/EN/81/415d363640933fe10000009b38f839/frameset.htm
For better understanding on how and when to create pooled/cluster table, refer to the below examples.
All Condition tables i.e., Annn tables (pricing/discounts etc.,) belong to the table Pool KAPOL (Condition Pool) as the underlying concept is same across different condition tables, but, they have different Key (primary) fields.
Accounting Document Segment (Line Item records) BSEG is a cluster table that belongs to the table cluster RFBLG. Also, other tables such as BSEC, BSED, BSES, BSET also come under the same table cluster as all of them possess the common Key i.e., BUKRS/BELNR/GJAHR.
Please contact for further details. <removed_by_moderator>
With Regards
Vijay Gajavalli
Edited by: Julius Bussche on Sep 4, 2008 8:40 AM

Joining of cluster and pooled tables ,transparent tables

Hi,
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 .
Thanks,
jahnavi.

Hi Jahnavi,
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
let us take one example BSEG its a cluster table where as there is one view VBSEGK it contains almost all the important fields needed so that u can make use of those or you can look into BSIK and BSAK tables so it better to avoid the cluster tables while retriving the data from the performance point of view

Reg cluster and pooled tables

hi experts..
can u pls give the names of some cluster and pooled tables?
regards
Sellavel

Hello,
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
Vasanth

Need of Cluster and Pool Table in SAP

Can anybody explain an importance of Cluster and Pool Table concept in SAP.

Hi Hema,
Given link was Helping but still I have few things as part of concept of Cluster and Pool Tables.
(1) As cluster and Pool, both are logical table in SAP, it doesn't have physical existence in Database. Means, a single database table (Actual physical in database server ) may contain more than one pool and cluster tables' data. Likewise it decrease no of Tables at database server whereas the amount of data may remain same. So, my question is how does it benefit in respect of Memory space at database server or any other means.?
(2). As per one of the difference between Cluster and Pool table - Tables pools doesn't need to have foreign key relationship whereas in case of cluster table it it must to have foreign key relationship. Why is it so..?
Hope I have brought more clarity to my doubt.
Regards,
Chetan.

Cluster and pooled tables

when we will use cluster table , pooled table and transparent tables...

FOr Tables
http://www.erpgenie.com/abap/tables.htm
For Tables
Pooled Tables, Table Pools, Cluster Tables, and Table Clusters
These types of tables are not transparent in the sense that they are not legible or manageable directly using the underlying database system tools. They are managed from within the R/3 environment from the ABAP dictionary and also at runtime when they are loaded into application memory.Pool and cluster tables are logical tables. Physically, these logical tables are arranged as records of transparent tables. The pool and cluster tables are grouped together in other tables, which are of the transparent type. The tables that group together pool tables are known as table pools, or just pools; similarly, table clusters, or just
clusters, are the tables which group cluster tables.Not all operations that can be performed over transparent tables can be executed over pool or cluster tables.
For instance, you can manage these tables using Open SQL calls from ABAP, but not Native SQL.These tables are meant to be buffered and loaded in memory, because they are commonly used for storing internal control information and other types of data with no external (business) relevance. SAP recommends that tables of pool or cluster type be used exclusively for control information such as
program parameters, documentation, and so on. Transaction and application data should be stored in transparent tables.
Table Pools
From the point of view of the underlying DBMS as from the point of view of the ABAP dictionary, a table pool is a transparent table containing a group of pooled tables which, when created, were assigned to this table pool.
Field Type Description
TABNAME CHAR(10) Table name
VARKEY CHAR(n) Maximum key length n =< 110
DATALN INT2(5) Length of the VARDATA record returned
VARDATA RAW(m) Maximum length of the data varies according to DBMS
Table Clusters
Similarly to pooled tables, cluster tables are logical tables which, when created, are assigned to a table cluster. Therefore, a table cluster, or just cluster, groups together several tables of type clusters.Several logical rows from different cluster tables are brought together in a single physical record. The records
from the cluster tables assigned to a cluster are thus stored in a single common table in the database.A cluster contains a transparent cluster key which must be located at the start of the key of all logical cluster tables to be included in the cluster. As well, a cluster contains a long field (VARDATA), which contains the
data of the cluster tables for this key. If the data does not fit into a field, continuation records are created.
Field Type Description
CLKEY1 CHAR(*) First key fields
CLKEY2 CHAR(*) Second key field
CLKEYN CHAR(*) nth key field
PAGENO INT2(5) Number of the next page
TIMESTMP CHAR(14) Time stamp
PAGELG INT2(5) Length of the VARDATA record returned
VARDATA RAW(*) Maximum length of the data section; varies according to database system
Working with Tables
The dictionary includes many functions for working with tables. There are five basic operations you can perform on tables: display, create, delete, modify, copy. Please do not confuse displaying a table with displaying the table entries (table contents). In order to display a table, it must previously exist; otherwise the system will display an error message in the status bar. For the following example, the table TABNA is used. To display this table, from the main dictionary screen, enter the table name in the Object name
input field with the radio button selected next to Tables. Then, click on the Display button at the bottom of the screen, or press the F7 function key, or, alternatively,
select Dictionary object Display from the menu.
In this screen, you can see table information such as
¨ Table type, shown next to the name of the object. In the example, it is a transparent table.
¨ Short text description.
¨ Name of the user who made the last change, and the date of the change.
¨ Master language.
¨ Table status. On the screen, you can see this table is saved and active.
¨ Development class. For information on development classes, refer to Chap. 6.
Delivery class, which sets the maintenance group for the table. It controls how tables will behave during client copy procedures, upgrades, and so forth.¨
Tab. Maint. Allowed flag, which indicates whether you can generate a screen for maintaining table entries.
¨Then, on the lower part of the screen, you can see the table fields with all associated characteristics such as:
¨ Field name.
¨ Key indicator. When set, this field is the primary key, or part of it.
¨ Data element.
¨ Basic data type.
¨ Length.
¨ Check table.
¨ Short text, describing the field.
Additional information about the table can be displayed by selecting the corresponding functions from the menu or directly from the application toolbar, such as keys, indexes, or technical settings.
Regards,
Balaji
**Rewards for helpful answers

Can anyone give ex's for poolled and cluster and transparent tables

Hi ,
Can u help me by providing ex's for poolled and cluster and transparent tables

Hi,
Following are the examples for each type.
Transparent table - VBAK.
Cluster Table -BSEG
Pooled Table - KAPOL
Regards,
Ankur Parab

Cluster and pool tables

I make a join with a pool table the compiler writes
Für Pool-Tabellen, Cluster-Tabellen und Projektions-Views ist JOIN
for pool-Tables, Cluster-Tables and Projections-View is no JOIN allowed.
What can I do to read the data from the table a005 in join.
thanks.
Waseem

>
Ahmad Waseem wrote:
> What can I do to read the data from the table a005 in join.
> thanks.
> Waseem
Hello Waseem,
Ans is DONOT use JOIN. You have to use FOR ALL ENTRIES.
You can JOIN only transperant tables. This is where JOIN scores over FOR ALL ENTRIES
BR,
Suhas

URGENT:HOW TO COMBINE CLUSTER AND TRANSPARENT TABLE..WITHOUT USING FOR ALL

how can we join bkpf and bseg without using FOR ALL ENTRIES.HOW DO I COMBINE THE 2 TABLES SO THAT I GET BETTER PERFORMANCE.
START-OF-SELECTION.
SELECT bukrs belnr gjahr budat FROM bkpf INTO TABLE i_bkpf
WHERE bukrs = p_bukrs AND "COMPANY CODE
gjahr = p_gjahr AND "FISCAL YEAR
budat IN s_budat. "POSTING DATE IN DOC
IF sy-subrc = 0.
SELECT bukrs belnr gjahr hkont shkzg dmbtr FROM bseg INTO TABLE
i_bseg FOR ALL ENTRIES IN i_bkpf
WHERE bukrs = i_bkpf-bukrs AND "COMPANY CODE
belnr = i_bkpf-belnr AND "A/CING DOC NO
gjahr = i_bkpf-gjahr AND "FISCAL YEAR
hkont = p_hkont. "General Ledger Account"
IF sy-subrc = 0.
SELECT bukrs belnr gjahr hkont shkzg dmbtr FROM bseg INTO TABLE
i_bseg1 FOR ALL ENTRIES IN i_bseg
WHERE bukrs = i_bseg-bukrs AND "COMPANY CODE
belnr = i_bseg-belnr AND "A/CING DOC NO
gjahr = i_bseg-gjahr. "FISCAL YEAR
ENDIF.
ENDIF.
IF NOT i_bseg1[] IS INITIAL.
LOOP AT i_bseg1.
IF i_bseg1-hkont = p_hkont AND i_bseg1-shkzg = 'S'.
v_sumgl = v_sumgl + i_bseg1-dmbtr.
ELSEIF i_bseg1-hkont = p_hkont AND i_bseg1-shkzg = 'H'.
v_sumgl = v_sumgl - i_bseg1-dmbtr.
ELSEIF i_bseg1-hkont NE p_hkont .
IF i_bseg1-shkzg = 'H'.
i_bseg1-dmbtr = - i_bseg1-dmbtr.
ENDIF.
i_alv-hkont = i_bseg1-hkont.
i_alv-dmbtr = i_bseg1-dmbtr.
APPEND i_alv.
v_sumoffset = v_sumoffset + i_bseg1-dmbtr.
ENDIF.
ENDLOOP.
regards
Essam.([email protected])

Hi Friend,
I see your code.. there is no other way than using for all entries for your situation.. how ever i saw ur code and a small recommandation in the change of code.
SELECT bukrs belnr gjahr budat FROM bkpf INTO TABLE i_bkpf
WHERE bukrs = p_bukrs AND "COMPANY CODE
gjahr = p_gjahr AND "FISCAL YEAR
budat IN s_budat. "POSTING DATE IN DOC
IF sy-subrc = 0.
if not p_hkont is initial.
SELECT bukrs belnr gjahr hkont shkzg dmbtr FROM bseg INTO TABLE
i_bseg1 FOR ALL ENTRIES IN i_bkpf
WHERE bukrs = i_bseg-bukrs AND "COMPANY CODE
belnr = i_bseg-belnr AND "A/CING DOC NO
gjahr = i_bseg-gjahr. "FISCAL YEAR
ENDIF.
i_bseg[] = i_bseg[]1.
delete i_bseg where hkont ne p_hkont.
else.
Your existing logic...
endif.
In this way you can avoide writing two selects on bseg..
Thanks
Mahesh

Reading Cluster and Pooled tables

Hi,
I have a requirement to read the following tables..
BSEG, KNOV, CDPOS, T6B2Fand AUAA.
out of which reading BSEG and CDPOS throwing timeout error. 20 million records each.
The idea is to read these tables and split the primary key into individual keys and dump into a Z table.
Your inputs are much valuable.
Thanks
AJ

Hi,
Please search the forum for the performance issues. These two table you've mentioned are very common giving performance issues. There are many posts on these table. Only option you have is using basic performance enhancement techniques.
Thanks.
Ravi

Diff Bt Cluser and pool tables?

HI,
Wats the diff between the cluster and pool tables?
Regards,
KK

Hi Kishore,
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).
Regards,
VKreddy

Difference between Temp table and Variable table and which one is better performance wise?

Hello,
Anyone could you explain What is difference between Temp Table (#, ##) and Variable table (DECLARE @V TABLE (EMP_ID INT)) ?
Which one is recommended to use for better performance?
also Is it possible to create CLUSTER and NONCLUSTER Index on Variable table?
In my case: 1-2 days transactional data are more than 3-4 Millions. I tried using both # and table variable and found table variable is faster.
Is that Table variable using Memory or Disk space?
Thanks Shiven:) If Answer is Helpful, Please Vote

Check following link to see differences b/w TempTable & TableVariable: http://sqlwithmanoj.com/2010/05/15/temporary-tables-vs-table-variables/
TempTables & TableVariables both use memory & tempDB in similar manner, check this blog post: http://sqlwithmanoj.com/2010/07/20/table-variables-are-not-stored-in-memory-but-in-tempdb/
Performance wise if you are dealing with millions of records then TempTable is ideal, as you can create explicit indexes on top of them. But if there are less records then TableVariables are good suited.
On Tables Variable explicit index are not allowed, if you define a PK column, then a Clustered Index will be created automatically.
But it also depends upon specific scenarios you are dealing with , can you share it?
~manoj | email: http://scr.im/m22g
http://sqlwithmanoj.wordpress.com
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Cluster and a Table

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