Databases are an important component of many datasets and the log file will help us determine both how good our database performance is, plus how well FME is interacting with the database.
The following example relates to a prefetch query carried out on an Oracle database:
2004-05-14 17:18:52| 476.1| 0.0|INFORM|Started SQL cache prefetch
2004-05-14 17:25:10| 476.2| 0.1|INFORM|Finished SQL cache
Although the time between when you issue the SQL prefetch and until it is complete is roughly 7 minutes, FME uses only 0.1 seconds of CPU time. The remaining time was spent by Oracle retrieving the data using the query it was given. To reduce that time, you would need to look at how the Oracle database is structured and how the query is written. Perhaps the field searched on isn’t indexed? Maybe the query supplied isn’t as efficient as it could be?