HP Intelligent Management Center Standard Software Platform - Manual (Page 203)

• The first stage of record selection takes place when the database server
processes the SQL query and returns a set of records to Crystal Reports.
• In the second stage, Crystal Reports further evaluates locally the record
selection formula for the set of records returned from the database server.
Since database servers are usually faster machines than workstations, it is
to your advantage to specify record selection formulas that can be processed
by the server in the first stage. Doing so minimizes record selection on the
local machine in the second stage. This process is commonly known as
"pushing record selection down to the database server." The following kinds
of record selections can be pushed down to the server:
• Selections with indexed and non-indexed fields (indexed fields provide
faster response).
• SQL queries with AND and OR clauses.
• SQL expression fields that carry out formula calculations for record
selection. (For the types of SQL expressions supported by your SQL
server, consult the documentation provided with the server.)
• For complete details on pushing your record selection formulas down to
the database server, see
Using enhanced record selection formulas .
Troubleshooting record selection
formulas
To troubleshoot your selection formula, you should first begin by making
sure that all of the fields referenced in the selection formula are placed on
your report. Then delete the selection formula and test it as you rebuild it,
step by step.
To troubleshoot record selection formulas
1. Write down the record selection formula on paper. You will use this written
copy to help you reconstruct the selection formula one step at a time.
2. Remove the record selection formula from your report by deleting the
formula from the Record/Group Selection Formula Editor in the Formula
Workshop.
3. Click Close when finished in the Formula Workshop.
Crystal Reports 2008 SP3 User's Guide 203
9 Record Selection
Troubleshooting record selection formulas