Tomka, Since this didn't post last time:
Another good test to do would be one that measures simultaenous steaming read-write. For example: create table_a, with at least 10,000 records, where field1 is the PK and field2 is a text field. create table_b, with 500,000 or more records, where field2 is an FK to table_a, and field_3 is a text field. do the following: UPDATE table_b SET field3 = field3 || 'something' WHERE EXISTS (select field1 FROM table_a where table_a.field1 = table_b.field2 AND table_a.field_2 = 'x') For the test to be most effective, the condition above should affect about 100,000 records of table_a, and the records should not be contiguos on disk. Further, tablea.field2 should not be indexed in order to force a disk scan. Also another test I'd really like to see is hardware raid (Adaptec, LSI) against Linux software raid, and 5-disk RAID 5 against 4-disk RAID 1+0. -- -Josh Berkus Aglio Database Solutions San Francisco ---------------------------(end of broadcast)--------------------------- TIP 3: if posting/reading through Usenet, please send an appropriate subscribe-nomail command to [EMAIL PROTECTED] so that your message can get through to the mailing list cleanly