Few things I can think of:
1. warn the user that the query may take some time and then show a splash
type screen that indicates that something is happening
2. Run the whole thing in a new window without the toolbar
3. rework the query so it doesn't take so much time. If there are a lot of
joins in the query, you need to re-order the joins to make the combinations
more efficient, perhaps break up the queries and place the individual
results in array. Then manipulate the arrays to show the data how you want.
(I did this to great effect to get a 4 minute query down to 10 seconds)
Bastien
From: <Thomas.Seiler@xxxxxxxxxxxx>
To: <php-db@xxxxxxxxxxxxx>
Subject: Long running db queries and the "STOP" button
Date: Thu, 27 Oct 2005 16:03:58 +0200
Hello list,
We are working on a project where we use PHP5 inside Apache2 and run very
long running queries on mysql 5 and postgresql. A single query might run up
to several minutes, and generally uses 100% CPU on the database server. So
far everything is fine.
Now what happens, is that sometimes the user hits the stop / back button
before the query completes and reissues a new one.
The result is that two queries are running on the database server, even
though the results of the first query will never be used.
Furthermore as both queries are concurring for the CPU, the second query
takes much longer than normal.
PHP will only realize that the connection was closed by the browser once
the database query is completed, but not during the query itself.
What we are looking for is a way to cancel a running query immediately when
the user hits the back / stop button on his browser.
We found no real solution for this problem in the usual places.
Any ideas, thoughts or comments are very welcome!
Cheers,
Thomas
---------------------------------------------
Thomas Seiler
Ing. sys. com. dipl. EPFL
SWISSCOM AG
Innovations
Security and Service Management
Ostermundigenstrasse 93
CH - 3050 Bern
SWITZERLAND
Phone: +41 (0)31 342 42 69
Mobile: +41 (0)79 427 97 26
Fax: +41 (0)31 892 62 27
Thomas.Seiler@xxxxxxxxxxxx
http://www.swisscom.com
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