Clusters

[Former Member]

Hi Experts,

What are clusters??

Thanks,

Ravi

[Former Member]

hi,

CLUSTER:

set of data objects.

Elementary fields , field strings and internal tables etc. will come under data objects.

You can store data clusters in ABAP/4 memory for short time and in database for longer time.

To write data objects from ABAP/4 program to ABAP/4 memory,the following statement is used.

Export f1

f2

to memory id 'table'.

Import f1

f2

from memory id 'table'.

Free memory id 'table'...Cluster will be deleted from the memory.

These cluster databases come into picture to keep the information

relating to a company more secure.

e.g. Payroll, time related data.

e.g. cluster database tables PCL1, PCL2, PCL3 and PCL4.

PCL1 is the database for HR application areas.It contains information

regarding the time recording.

PCL2 contains information regarding payroll accounting.

PCL3 contains applicant data.

PCL4 contains change documents for HR master data.

Cluster rx contains the payroll results for country x according to table

T500l.

The clusters can be called from macros.

RP-IMP-Cn-xx ( n = 1,2,3,4 and xx is cluster)

When macro is used to import data,it is not directly get from database table PCL,

instead it checks for the buffer directory whether it contains it in main memory.

if it is there it takes it from main memory..otherwise it reads from PCL to main

memory and from there to the report.

Standard import programs follow the naming convention RPCLSTxx..xx is cluster.

RP-EXP-Cn-xx ( n = 1,2,3,4 and xx is cluster)

[Former Member]

Hi Ravi,

Go through the following link.You will get a brief knowledge about clusters in HR

www.hrexpertonline.com/downloads/12-04.doc .

[Former Member]

hi

good

Data clusters are stored in a storage medium with the help of the statement EXPORT ( see: Statements for Data Clusters) . This is achieved using the different variations of the addition medium. These are as follows:

· DATA BUFFER xstr for storage in a byte string xstr

· INTERNAL TABLE itab for storage in an internal table itab (Standard table)

· MEMORY ID id for storage under the name id in the ABAP Memory

· DATABASE dbtab ... ID id for storage under the name id in a database table in the ABAP Dictionary

· SHARED MEMORY dbtab ... ID id and SHARED BUFFER dbtab ... ID id for storage under the name id in the cross-transaction application buffer of the applications server's shared memory.

In the following you will learn more about the temporary storage of data clusters in ABAP memory and shared memory, as well as permanent storage in databanks. You can find detailed information about the different storage media in the keyword documentation.

http://help.sap.com/saphelp_nw2004s/helpdata/en/fc/eb3bc4358411d1829f0000e829fbfe/content.htm

thanks

mrutyun^