The total story till now:
Win2000
8.1.7.
- I started having 1 instance called PREV
- In PREV, I imported the PREVENT scheme containing about 30 tables
- I analyzed (COMPUTE) the PREVENT scheme
- I query from only 2 tables of that PREVENT-scheme (one -DISTRICT- having
20 records, the other -DISTRICT_STREET- 2000).
- When I select from the PREV database by means of:
"select id_district, district_name FROM district, district_street where
(district_id=id_district) AND (place_street_id=707)"
the performance is between 200msec and 2sec for generating 3 records (poor)!
- In the PREV database I created a copy of the district table by means of:
"create table district2 as select * from district"
- I analyzed (COMPUTE) the PREVENT scheme again
- When I select from the PREV database by means of:
"select id_district, district_name FROM district2, district_street where
(district_id=id_district) AND (place_street_id=707)"
the performance is between 1msec and 10msec for generating the 3 records
(good)!
So why is the performance using the imported table (20 records!) so bad?
(does Oracle treat it different than the copy-table? conversion?)
Please help...
Stephan
Received on Thu Jan 02 2003 - 12:16:45 CST
