Hi David,
From the comments on unbuffered_query:
However, when using different db connections, it all works ofcource ...
So create a second db connection and when you run the insert use that
instead:
$result2 = mysql_query("insert blah", $dbconnection_two);
client-compress will compress the data on the way to php but then it has
to be uncompressed etc (this won't affect much if you're doing it to a
local mysql server though, it's more for network servers).
David Yee wrote:
Thanks guys- I think I'll have to do multiple queries using LIMIT as Geoff
suggested since apparently mysql_unbuffered_query() would lose the result
set of the "select * from" query once I run the insert query. I'm still not
sure why the MYSQL_CLIENT_COMPRESS didn't seem to have an effect, however.
David
-----Original Message-----
From: Chris [mailto:dmagick@xxxxxxxxx]
Sent: Monday, February 06, 2006 4:16 PM
To: David Yee
Cc: 'php-general@xxxxxxxxxxxxx'
Subject: Re: PHP mysql data result set compression
Hi David,
See http://www.php.net/mysql_unbuffered_query
It won't load the whole lot into memory before returning it to php.
David Yee wrote:
Hi all- is there a way have a large data result set from MySQL compressed?
E.g. I have a table with over a million rows of data that I want to do a
"select * from " on and then take that result, do some field/data
manpulation, and then insert row-by-row to another table. The problem is
the result of the query is so big that it's casuing PHP to swap to disk,
causing things to slow to a crawl. Doing a "show processlist" on the
mysql
console shows that "Writing to net" is the state of the running "select *
from " query. I tried adding the flag "MYSQL_CLIENT_COMPRESS" to both
mysql_pconnect() and mysql_connect() but it doesn't seem to do any
compression (I can tell by the size of the running php memory process).
Any
ideas would be appreciated- thanks.
David
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