Oracle Forms Developer – Form Builder Reference, Volume 1

Precompute Summaries property
Description
Specifies that the value of any summarized item in a data block is computed before the normal query is
issued on the block. Form Builder issues a special query that selects all records (in the database) of the
summarized item and performs the summary operation (sum, count, etc.) over all the records.
Applies to block
Set Form Builder
Required/Optional Required if the block contains summarized items and the block’s Query All Records
property is set to No.
Default
No
Usage Notes
When an end user executes a query in a block with Precompute Summaries set to Yes, Form Builder fires
the Pre-Query trigger (if any) once before it executes the special query. Form Builder fires the Pre-
Select trigger (if any) twice: once just before executing the special query, and again just before
executing the normal query.
Precompute Summaries restrictions
You cannot set Precompute Summaries to Yes if any of the following are true: (1) the block contains a
summarized control item, (2) a minimize or maximize operation is performed on a summarized item
in the block, (3) the block’s Query Data Source is a stored procedure or transactional triggers (must be
a table or sub-query), or (4) the block contains a checkbox item, list item, or radio group with an
empty Other Values property..
• Read consistency cannot be guaranteed unless (1) the form is running against an Oracle7.3
database, and (2) the form-level Isolation Mode property is set to Serializable.
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