Software Platform User guide

Table Of Contents
Does your primary report include a record selection formula that sets
range limits on the key (indexed) field in Table A?
Index A
Is Table A on the field you are going to use indexed to match up the
records?
Index B
Is Table B on the field you are going to use indexed to match up the
records?
Reads A
How many records does the program have to read out of Table A to find
the two records it is looking for?
For each A reads in B
How many records does the program have to read in Table B to find the
200 records it is looking for?
Total Records Read
What is the total number of records the program has to process to
complete the task?
PC Data
Total
Records
Read
For each
A reads
in B
Reads AIndex BIndex A
Selec-
tion For-
mula
Link
ing/Sub
report
2600
100
(26*100)
26Yes
Yes or
No
NoLinking
2600
100
(26*100)
26YesNoYesLinking
668 Crystal Reports 2008 SP3 User's Guide
Understanding Databases
25
Linking tables