I see this occurring randomly on different quries with different indexes/tables.
It appears like php is taking a lot longer than mysql's transmission time to cache the result be it bool TRUE/FALSE or a select of 1 - 50 records. While it does not happen all the time, since from the MySQL side I can see how long each step was and how long it took to even transmit the results to the php server. I am thinking it a small memory hole we do not normaly see for some reason but there are no sqlng parameters even that seem to be able to help in this situation. Also since this is is not really repeatable as is occurs only sometimes and not with a predictable frequency it would be very hard to do the roll back. Also since its in the mysql class of functions I cant even debug into it to try to see much of anything (since its c++ code not userland functions). David -----Original Message----- From: Chris [mailto:dmag...@gmail.com] Sent: Sunday, April 11, 2010 6:26 PM To: David Murphy Cc: php-db@lists.php.net Subject: Re: [PHP-DB] Mysql completing Query fast but mysql->query() takes long time to return even single selects/updates David Murphy wrote: > As you can see PHP claims it took 20 seconds for mysql->query() to return > but mysql think is took around 1.0s > > > This is from our application > I enabled profile in mysql to determine why an update took 20seconds. As > you can see MySQL reported no where near that amount of duration took > place. > Is there any way I can dig into php and determine why mysql client libs are > so slow (this is not using mysqlnd but mysql-client-libs on CentOS using > 5.3.2) Is this a one-off thing or is it happening all the time? If it's a one-off thing it could be a spurious result (maybe someone else was doing a mysqldump when your query ran, the dump blocks your query).. What sort of mysql table is it? if it's innodb you can try it in a transaction and roll it back: begin; update blah; rollback; see how long it takes. if it takes a short time in the mysql client, then try it in a php script from your other server. -- Postgresql & php tutorials http://www.designmagick.com/ -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
