4-Data Dictionary.doc
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Data Dictionary
SAP Data Dictionary and using Data Dictionary Objects,Tables, Views, Domains, Data elements and lock objects
Data Dictionary and What are
main Functions of Data
Dictionary in SAP ?SAP Data Dictionary is a central repository for the development of Objects, SAP Data Dictionary
is used to create and maintain meta data ( data definitions ) . T-Code for Data Dictionary isSE11.
SQL Can be divided into two parts
• DML -- Data Manipulation Language
• DDL -- Data Definition Language
Where DML consists of SELECT, INSERT, UPDATE, MODIFY, DELETE etc, this will be handled
by ABAP Programs and DDL consists of commands like CREATE TABLE, DROP TABLE, ALTER
TABLE, CREATE INDEX etc, this will be handled by Data Dictionary, hence Data Dictionary is
the central repository for the development of objects .
The Main Functions of Data Dictionary are :
• Data Base Tables
• Views
• Data Elements
• Domains
• Structures
• Search Helps
• Lock Objects
An ABAP Consultant may need to work on below areas of data dictionary :
• Creating Tables
• Creating Data elements and Domains
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• Creating structures and Table types
• Creating search helps
• Creating Lock objects
• Creating data base views
Navigation: T-code : SE11
Data Types-Domains-Data
ElementsABAP uses different types of Data Types for Objects, basically there are three types of data types
Elementary Data types, Complex Types, Reference Types .
In Elementary types there are again two types of data types( Categories ) Fixed Length and
Variable Length .
Fixed Length:
• C Text Field
• N Numeric
• D Date
• T Time
• H Hexadecimal
• P Parked Number
• I Integer
• F Float
Variable Length• STRING Character Sequence
• XSTRING Byte Sequence
Complex Types includes Structure Types and Table Types.
Reference Types includes Data References and Object References
What is a Date Element in SAP ABAP ?
Data element is an object which specified semantic information of a field, ex: field label , heading.
(We all know that table is a collection of fields, ex: STUDENT is a table with fields STUDENT_ID,
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STUDENT_NAME ext, data element specifies the field labels and headings for these fields )
What is a Domain in SAP ABAP ?
Domain is an object which specified technical information of a field in a table ex: Data type,
length, value range etc
Why we use Data elements and Domains in SAP ?
When ever we are creating a new table or adding a field to existing table, we need to specify field
labels and data types for the field, in SAP we maintain these values in the form of Data elements
and Domains.
Creating Domain and Data
ElementCreating a Domain in SAP
Go to SE11 T-code, select domain radio button, provide a name (ZSAPN_DOMAIN) and create.
Provide short description, no of characters and save (Ctrl S ).
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Select local object ( non transportable object ).
Activate.
Domain is created.
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Creating data element in SAP
Go to SE11, select data type radio button, provide a name (ZSAPN_DATAELEMENT) and create.
A popup will open, select data element radio button
Enter short description and domain name (ZSAPN_DOMAIN) and select field label tab.
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Select field label tab and maintain field labels.
Save and Activate, Data element is created.
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Components of SAP TablesWhat are the components of database tables in SAP ? What is a key field,
delivery class and size category in SAP ?
Before creating a table we must know components of Table.
What is a key field ?
A field which dosent accept duplicate data is called as key field.
What is a delivery class ?
It specifies the type of data stored in a data base table ex: master data, Transaction data, system
data etc
Options available under delivery class :
A- Application Table (Master and Transaction data ).
C-Customizing table, maintenance only by customer not SAP.
L-Table for storing temporary data.
G, E, S, W - These are used to store system data (Basis data ).
Display and Maintenance
It specifies whether the user can display the data and maintain the data , the following options
are available under display and maintenance.
1.Display/Maintenance Allowed.- User can display and maintain data.
2.Display/Maintenance allowed with restrictions - Some users can display and maintain
data.
3.Display/Maintenance not allowed - No user can display data.
What is data class ?
It specifies the physical area of a table in the database, the following options are available under
data class.
APPL0 - Master data
APPl1 - Transaction data
APPL2 - Organization and Customizing
DDIM, DFACT, DODS etc are used by BI and BW.
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What is size category ?
It specifies the number of records that can be stored in a database table, options available under
size category are below.
Size Category No of expected records
0 0 - 7,100
1 7,100 - 28,000
2 28,000 - 1,10,000
The above numbers may vary from company to company .
Size category will be incremented dynamically based on increase in records.
Buffer
It is a temporary memory for storing the data .
It is same as cache memory.
The functionality of buffer is defined below.
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Types of database tables in SAPWhat are the different types of database tables in SAP ? What are
Transparent Tables, Pooled Tables and Cluster Tables in SAP ?
There are three types of tables available in SAP, explained below
Transparent table
There is a physical table on the database for each transparent table. The names of the physical
tables and the logical table definition in the ABAP/4 Dictionary correspond.
All business data and application data are stored 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 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.
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Creating Table in SAPHow to create a Transparent Table in SAP data dictionary ? What in Top to
Bottom and Bottom to top approach to create database tables in SAP ?
A table can be created in two ways one is top to bottom approach and another one is bottom to
top approach.
1.Top to Bottom : In this approach, first table fields are defined and later domain and data
element are defined.
2.Bottom to Top : In this approach, first domain and data element are defined and later table will
be created .
In this example we are going to learn creating a SAP transparent table using top to bottom
approach ( I suggest simplest way ).
Go to SE11 T-code, provide table name to be created ZSTUDENT_TABLE and create.
Provide short description, delivery class (A), Display Maintenance Allowed and select fields tab.
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Select Fields tab, add a field STUDENT_NO, data element as ZSTUDENT_NO and check Key
and Initial Value check boxes.
A table must contain at least one key field, without a key field we can not create a table.
Double click on data element ZSTUDENT_NO (Not yet created), a pop up will open click yes and
one more information message will come press enter.
Now a pop up will come asking to create date element, click yes.
Provide short description, domain and label
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Save, double click on domain name ZSTUDENT_NO, click on yes.
Provide short description, data type, no. characters, save and activate.
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Similarly create remaining fields with data elements and domains as below
Once all fields are created click on technical settings button.
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Provide data class and size category, save and activate.
You will get a warning message just click on No, table is created.
Now add entries to table.
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Creating Structure in SAPWhat is a structure in SAP Data Dictionary ? How to create a Structure in SAP
data dictionary ?
Structure
Structure is list of fields defined under a name, which is used to process data at run-time in SAP
ABAP applications.
Structures are two types one is global structure and another one is local structure. Local structure
can be created in ABAP programs and global structure can be created in data dictionary and can
be reusable in different objects.
In this lesson we will be learning creating a structure in data dictionary.
Go to SE11, select Data Type radio button and click on create.
A pop up will open, select structure radio button and continue.
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Provide short description, add some fields, save and activate.
The structure is created, now we can use this structure in our ABAP programs.
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Difference between structure and
table in SAP data dictionaryTable and structure have lot of differences in the sense of behaviour and properties, the below
are the main differences between table and structure in data dictionary.
Table and Structure Difference
Table Structure
Table can store data physically and permanently. Structure can not store data physically,it can hold data at run time only.
Table have primary key. Structure dosent have any primary key.
Table have technical settings (data class, size category
etc), maintanance attributes ( Display maintanance
restrictions ).
Structure dosent have any technical
attributes and maintatance attributes.
Table have primary and secondary indexes. Structures dosent have primary and
secondary indexes.
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Difference between Transparent,
pooled and cluster tables inSAP
The below are the major differences between transparent, pooled and cluster tables in SAP data
dictionary .
Transaparent Tables Pool Tables Cluster Tables
Contain a single table. Used to
store master data
They are used to hold a large
number of very small
tables(stores system data).
They are used to hold data from
a few number of large tables.
(stores system data).
It has a one-to-one relationship
with a table in the database.
It has a many-to-one
relationship with a table in the
database.
It has a many-to-one
relationship with table in the
database.
For each transparent table
there is one associated table in
the database.
It is stored with other pooled
tables in a single table called
table pool in the database.
Many cluster tables are stored in
a single table in the database
called a table cluster .
The database table has the
same name, same number of
fields and the fields have the
same names .
The database table has
different name, different
number of fields and fields have
different names.
The database table has different
name, different number of fields
and fields have different names.
There is only a single table . Table pools contain more tables
than table clusters .
Contains less tables than table
pools .
Secondary indexes can be
created .
Secondary indexes cannot be
created .
Secondary indexes cannot be
created .
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Table Validations using check
tableWhat is a check table in SAP ? Data validations on SAP tables using check
table, creating check table in SAP
What are table validations ?
Table validation is a concept through which we can restrict invalid entries in a table.
Possible methods/concepts for table validation1. Field Level validations: We can validate entries at field level with the help of check table
concept.
2. Domain level validations: We can restrict entries at domain level with the help of fixed values
of domain and value table of domain.
What is check table ?
It is a table which contains all valid entries of a field.
What is value table ?
It is a table which contains all valid entries of a domain, this domain can be reused in multiple
tables.
What are fixed values for domain ?
These are allowed values for a domain ex: GENDER (domain).
Creating check table for table validations.Step1: Go to SE11, create a table ZSTUDENT_CHECK as
below
Go to SE11, provide name as ZSTUDENT_CHECK and click on create.
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Provide delivery class and display maintenance allowed.
Go to fields tab and add field as below
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Click on technical settings button and provide data class and size category.
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Go to utilities- table contents - create entries add some entries to the table.
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Similarly add some more entries.
Step2: Add ZSTUDENT_CHECK as check table for
ZSTUDENT_TABLE
Go to SE11, provide table name as ZSTUDENT_TABLE( which we have created already in our
previous lessons, if not create a table)
Go to tab Entry help/check, select city fields and click on foreign key icon.
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Provide short text, check table name ZSTUDENT_CHECK and click on generate proposal and
click on copy.
A check table will be added for CITY field
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Save and activate the table(If you get a warning popup when activating just press no).
Now go to utilities - table entries -> create entries
Provide a city name which is not in ZSTUDENT_CHECK table and try to save, it will trough an
error.
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Fixed Values for domain in SAPSAP Table screen entries can be restricted using domain fixed values, we can maintain domain
fixed values at domain level when creating a domain.
Create domain with fixed values
Go to SE11, select domain, provide name as ZGENDER, click on create.
Provide short description, data type and length as below and click on value range tab.
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Provide fixed values.
Save and activate.
Create data element with domain
Go to SE11, select data type, provide name as ZGENDER, click on create .
A popup will come, select data element and press enter.
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Provide short description, domain and click on field label.
Provide field labels
Save and activate
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Add a field in table
Go to SE11, provide a table name ZSTUDENT_TABLE(we have already created, if not create
table ) and click on change
Go to fields tab and add a field as below.
Save and activate
Go to table utilities- table entries - create entries
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Provide values other than M, F and N, it will through an error .