What is secondary index in SAP BC-DWB-DIC - ABAP Dictionary?

SAP Term: secondary index

• Component: BC-DWB-DIC

• Component Name: ABAP Dictionary

• Description: An index of database tables defined in that can be created in addition to the primary index. When a table is activated in , the primary index is created automatically using the primary key fields of the table. Creating secondary indexes can improve the performance of database reads performed on the indexes of the database. In ABAP, internal tables can also be assigned a secondary table index.

Smart SAP Assistant

• Key Concepts: 
  A secondary index is a type of database index in SAP that is used to improve the performance of queries. It is an additional index that is created on a table to speed up the retrieval of data from the table. The secondary index is created on a field or combination of fields that are not part of the primary key. 
  
  How to use it: 
  In order to create a secondary index, you must first create a database table in the ABAP Dictionary. Once the table has been created, you can then create a secondary index on the table. To do this, you must select the “Create Secondary Index” option from the context menu of the table. You will then be prompted to enter the name of the secondary index and select the fields that you want to include in the index. 
  
  Tips & Tricks: 
  When creating a secondary index, it is important to consider which fields should be included in the index. It is best to include fields that are frequently used in queries as this will improve query performance. Additionally, it is important to note that secondary indexes can only be created on non-key fields and cannot be used for sorting or filtering data. 
  
  Related Information: 
   Secondary indexes are just one type of database index available in SAP. Other types of indexes include clustered indexes and bitmap indexes. Additionally, there are other techniques available for improving query performance such as using views and materialized views.