Cluster table

In view no actual data get stored but it will just join two tables

Where cluster tables are combination of two or more database tables having actual data

Rewards if useful.............

Minal

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 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.

Tables : These are the data holders we can store the data inside.

views : these are virtual tables we are going to show data with respect to tables in views .

VIEWS we can select the data which is already combined at the dictionary level. This is done in SE11

View - It is usually created with the intention to reduce the lead time for fetching thedta. The view can be a single table or based on join.

View as such does not hold any data. The SQL statement used to create view is compiled and avaialble in the DB. Hence data fetch will be fast.

Database View - To club more than one table

Projection View - To hide fields in one table

Maintanance View - To maintain database records in table

Help View - To provide help for a fields (Same functionality as Search help. This is outdated)

View are improves perfromance in the following aspects

1. If you want to use more than two table in 'JOIN' condition better to use Views . It will improves performance of a program

2. If you want to use mutiple FOR ALL ENTRIES clause, better to club all SELECT statement in a view.

note:

1.Views does not contain data in it. It fetches data from the database only depending on the condition ...

2.Views are part of data dictionary. They are a window to view the data in database

3.views can be used to give security to data. users can be allowed to view only basic data only

Regards

Vasu

Hello Sriram,

<b>Cluster Table:</b>

Cluster tables are logical tables that must be assigned to a table cluster when they are defined. Cluster tables can be used to strore control data. They can also be used to store temporary data or texts, such as documentation.

A clustered and a pooled table cannot be read from outside SAP because certain data are clustered and pooled in one field.

<b>View :</b>

database view is a logical defination of table it does not exists physically in the database. it gets its value from the database depending on its defination. and joins used.

databse view - it is a window to a database table.

Views are nothing but the Inner join on tables. They do not contain data physically, They contain data only at run time which they derive from the underneath tables.

To get clear idea on cluster table check

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

<b>Reward Points If Useful</b>

Regards, Srikanth

Hi,

<b>VIEW</b> is basically a JOIN on one or more tables and does not store the data instead uses the JOIN to fetch the data, so does not occupy any memory in the database.

Where as <b>Cluster table</b> is a kind of table where Many ABAP DDIC tables are mapped to One Database table. And the data is stored in archive format. So they occupy the memory in the database.

<b>Cluster table</b> is a 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>View</b>

Grouping of columns in one or more database tables according to application-specific criteria. In an ABAP-based SAP system, views are defined in the ABAP Dictionary and can be referenced as data types like flat structures. Views can be used like database tables in read Open SQL statements.

Regards,

Sesh

culster tablescontains documentation of the fields of the tables where as using views we able to see the output of the tables using database view or projection view , but primary key shoud be same when we want to see the output of two or more tables

CLUSTER TABLE: The data from several tables is 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.

VIEW : Physically it don't have data during run time it picks data from various tables based on join conditions.

Regards,

Sairam