SAP NetWeaver AS ABAP Release 740, ©Copyright 2014 SAP AG. All rights reserved.
ABAP Keyword Documentation → ABAP Glossary →secondary index
Index of database tables defined in ABAP Dictionary. Created alongside the primary index. Creating secondary indexes can improve the performance of database reads performed on the indexes of the database. A secondary index can be unique, but does not have to be. A secondary table index can be assigned to internal tables.