Insert Statement taking longer time

Question

Hi,
One of my insert statement inside the procedure is taking more than 10secs to complete.
Scenario:
1. Having three tables e.g invoice table - invoice header, invoice Item and invoice attribute
2. These tables are loaded with data in the above specified order and they are not commited till all the data for an invoice gets inserted sucessfully.
e.g
a. Invoice header gets inserted first(one row)
b. Invoice Item second(will be in a loop with more than one row)
c. For every Invoice item an invoice attribute will be inserted
(Invoice Attribute has a FK column with a PK column in invoice item table column)
The problem is while inserting data into InvoiceAttribute it takes more than 10sec, IF the FK(mentioned above) is disabled insert statement is running fine.
note: Invoice Item table has 8.4million records
My assumption :
while inserting into Invoice attribute table the insert statement validated the FK with the invoice item table, since the new Inovice item id(PK column in invoice Item table) is not commited the insert statement takes time to validate the FK against (8.4million records)......
Please suggest me a solution.....................
Thanks in advance
NaveenPeri

Answer 1

I'll try with a blind shot : The FK is likely missing an index, thus performing full table scan on invoice attribute each time you perform an insert on the invoice attribute table.
By default an FK doesn't have an index. You must create one manually.
If this turns out to be a missfire then please post a plan with statistics for the attribute insertion.
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