Question

I think I’m having an issue with my MySQL server or the Query I’m using. I’m not sure which.

Server is VM Ubuntu12.4 4 cores/16gb Ram
MySQL 5.5.24 x86

My query:

INSERT INTO `NEWTEXT`.`Order_LineDetails`

( OrderLineItem_ID, Customer_ID, Order_ID, ProductName )
SELECT
'Order_Details'.'OrderDetailID',
'Orders'.'CustomerID',
'Order_Details'.'OrderID',
'prods'.'ProductName'

FROM Order_Details 
JOIN Orders ON Orders.OrderID = Order_Details.OrderID
JOIN Products prods ON prods.ProductID = Order_Details.ProductID
WHERE Orders.OrderID = 500000

I’m not really sure where to start looking for the problem. The above query takes 9+ seconds to complete. The Order_Details table contains 1,800,000+ records in it.

The thing that is bugging me on this is that when I run a select query it also goes slow. BUT, I have another server that’s running win2k MsSql and its almost instant with the same SELECT query.

I’m hoping someone could point me in the right direction here.

EDIT

Well, sorry for the troubles and thanks for your help.

I found that the problem was that after I finished the import I skipped the step where I would normally assign the new tables a PrimaryKey. I know, 🙁 dumb.

Anyway! Don’t forget to assign your Primary Keys!

Answer 1

Back to the start:
http://dev.mysql.com/doc/refman/5.5/en/optimizing-primary-keys.html