Hi,
I am seeing some search performance behavior I don't understand and am
hoping someone can provide some insight.
We have an application that searches a very large table (millions of
rows) for orders. We have options to search with wild cards, and and
do case insensitive searches. Typical generated SQL for case
insensitive wild card search looks like this:
SELECT <bunch of attributes>, from ORDERS T0 WHERE
UPPER(T0.EMAIL_ADDRESS) LIKE UPPER('[EMAIL PROTECTED]') ESCAPE '\;
This query can take up to a minute and a half. It takes the same
amount of time whether the query is run directly against our database
or using our application. This is what I would expect.
A case insensitive non wild card search produces SQL below
SELECT <bunch of attributes>, from ORDERS T0 WHERE
UPPER(T0.EMAIL_ADDRESS) LIKE UPPER('[EMAIL PROTECTED]') ESCAPE '\;
Here is what I don't understand: If I run the above query directly
against our database, it takes about 12 seconds. However, running it
through the app still takes about a minute and a half.
Can anyone explain why this might be from an EOF perspective?
Thanks,
Josh
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