2.1.1.3 Indexes

An index defined on one or more columns in a table provides faster retrieval of data for searching, sorting and filtering based on the values in those columns. Indexes use a sort order for each column involved in the index, which specifies the order in which the column data is indexed.

This protocol defines the Index element (section 2.2.1.8) for specifying an index on one or more columns (1) in a table in which the columns (1) can have duplicate values.