March 2007
Beginner
526 pages
13h 53m
English
book
Introduction to the New Mainframe: z/VSE Basics
by Wolfgang Bosch, Hans Joachim Ebert, Helmut Hellner, G. M. (Jerry) Johnston, Wilhelm Mild, Ingolf Salm, Joerg Schmidbauer, Martin Walbruehl, Mike Ebbers
Content preview from Introduction to the New Mainframe: z/VSE Basics
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Chapter 12. Database management systems on z/VSE 301
• Values - At the intersection of a column and row is a
value. For
example, PLANNING is the value of the DEPTNAME column in the row
for department B01.
Indexes
An index is an ordered set of pointers to rows of a table. Unlike the rows of a
table that are not in a specific order, an index must always be maintained in
order by DB2. An index is used for two purposes:
– For performance to retrieve data values more quickly
– For uniqueness
By creating an index on an employee's name, you can retrieve data more
quickly for that employee than by scanning the entire table. Also, by creating
a unique index on an employee number, DB2 will enforce the uniqueness of
each value. A unique index is the ...
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