What is an index in COBOL?

An index is a displacement of element from the start of the table. An index is declared with Occurs clause using INDEXED BY clause. The value of index can be changed using SET statement and PERFORM Varying option. Syntax. Following is the syntax for defining Index in a table −

How do you create an index table in COBOL?

You create an index by using the INDEXED BY phrase of the OCCURS clause to identify an index-name. For example, INX-A in the following code is an index-name: 05 TABLE-ITEM PIC X(8) OCCURS 10 INDEXED BY INX-A.

What is index and subscript in COBOL?

Index is faster in accessing table data item. Subscript can initialize by using MOVE statement. Index should initialize by using SET statement. Subscript can increase by using ADD statement and decrease by using SUBTRACT statement.

Can COBOL display index value?

Yes, we can. Simply set some ws variable to the index and display that. Index variable is S9(8) comp, takes up one word, it means the physical address in the main storage.

What is index in DB2?

Index is a set of pointers, which can refer to rows in a table, blocks in MDC or ITC tables, XML data in an XML storage object that are logically ordered by the values of one or more keys. It is created on DB2 table columns to speed up the data access for the queries, and to cluster and partition the data efficiently.

Why We Use declare index?

Declare Indexes are used to expose aggregate properties like Page/List/Group for reporting purposes. Declare Indexes belongs to the declarative network and are fired automatically without any invocation. Declare indexes can be extended for Rule-, Data– and Work– classes.

Can we initialize index in COBOL?

We have a COBOL program in which we populate values into a COBOL internal table and then search this table to find out a certain value. Prior to this search, we initialize tables index variable. SET PAF-IDX TO 1.

What is index or subscript?

Subscript refers to the array occurrence while index is the displacement (in no of bytes) from the beginning of the array. An index can only be modified using PERFORM, SEARCH & SET.

Which is better index or subscript?

Using indexes to address a table is more efficient than using subscripts since the index already contains the displacement from the start of the table and does not have to be calculated at run time.

What is a index key?

The index key is a null terminated string of null terminated tokens as shown in the following example: +Col1\0-Col2\0+Col3\0\0. The key in the example may be used to create an index over three columns in the table. Each column specified in the index is referred to as the “index segment” or “key column”.

What is PEGA indexing?

Indexing in Pega Can be done for Embedded Properties like Page List. When we Optimize Page List Properties, PRPC Create a dedicated table for Page List. This table each row corresponds to one index page of page list. This is called as Index Table.