Project: Birt
Bug 147101 Report generation performance is sluggish
Reported: 2006-06-14 14:41:24 | Status: resolved fixed

The overall performance of report generation appears to be quite sluggish. Here are numbers that we have measured using ORACLE as a DB. We use ORACLE 10g w/ojdbc14.jar thin driver. select rownum, datetime_id, another_id, text from ( select max(datetime_id) as datetime_id, another_id, text from some_oracle_schema.sample_table where text < 'c%' group by another_id, text ) Query resulting in 8465 rows Using PL/SQL developer: ----------------------- Execution: approx 1 second Iterating through all rows via PL/SQL developer UI: 10 seconds BIRT: ----- Preview page (via dataset editor): shows all 8465 rows in 53 seconds Preview tab (in the designer): shows all 8465 rows in 79 seconds Generation of rptdocument from rptdesign using API: 55 seconds

Files changed in fix:
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/executor/transform/group/GroupCalculationUtil.java data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/impl/QueryExecutorUtil.java