What are indexes?
Answers were Sorted based on User's Feedback
Answer / shreeshaildiggi
Indexes - What are they and how can I use them?
An index helps to speed up selection from the database. An
index is a sorted copy of selected database table fields.
The primary index is always automatically created in an
ABAP-based SAP system. It consists of the primary key
fields of the database table. This means, for each
combination of the index fields exists a maximum of one
record in the table. This kind of index is called a UNIQUE
index.
If the primary index cannot be used to determine selection
result, (for example, the WHERE condition does not contain
any primary index fields), the system searches the whole
table. To prevent this, and determine the selection result
by searching through a restricted number of database
records, you can create a secondary index.
However, you should not define an index for all possible
fields in the WHERE condition.
Creating a secondary index :
You can use the transaction ABAP Dictionary Change →
Indexes... → Create to create an index. To make the index
unique, select UNIQUE. To specify the fields that will
comprise the index, choose "Choose fields". Then save and
activate the index.
Optimal number of indexes for a table :
You should not create more than five indexes for any one
table because:
Whenever you change table fields that occur in the index,
the index itself is also updated.
The amount of data increases.
The optimizer has too many chances to make mistakes by
using the 'wrong' index.
If you are using more than one index for a database table,
ensure that they do not overlap.
Thank's and Regards
Shreeshail Diggi
SAP Technical Consultant Infinite India
Is This Answer Correct ? | 1 Yes | 0 No |
Answer / paramjeet
Indexes are described as a copy of a database table reduced
to specific fields. This data exists in sorted form. This
sorting form ease fast access to the field of the tables. In
order that other fields are also read, a pointer to the
associated record of the actual table are included in the
index. the indexes are activated along with the table and
are created automatically with it in the database.
Is This Answer Correct ? | 0 Yes | 1 No |
what are medruck, rvorder01
I have two structures s1 and s2 have same struture of five fields each how can u transfer data from s1 to s2
what is the client on which u have worked? In real time ?
what are the two methods of modifying sap standard tables? : abap data dictionary
What are field symbols and field groups? Have you used component idx of structure clause with field groups?
What is the difference between a pool table and a transparent table?
Update types in Call transaction method. What is the difference?
can we transport text elements and text symblos in reports from devlopment to quality?is it necessary?
What are the table controls in bdc ? What is the difference between bdc and lsmw ?what is the difference between bdc and rfc ? : abap bdc
what is the transaction code to create LOGO in sap scripts?
what is the full form of ECC 5.0?
while running bdc for call transaction method, in gui_upload function we use filetype 'ASC' for tab delimited seperated data. like that for csv(comma delimited) data what we have to use as filetype??? ie FILETYPE = ?????