Re: [PHP-DB] slow mysql queries via php5-mysql
Marcin Debowski wrote: I upgraded my old Fedora Core 5 server running mysql and php-mysql from 5.022 and 5.1.6 to 5.075 and 5.2.6 respectively and performance problems with accessing the databases appeared. I am not sure what is the source but it seem to be rather related to php5-mysql than the mysql engine itself. This is how it shows up for a database of ~ 50k records: Query: SELECT * FROM `zdjecie` WHERE 1 LIMIT 15000, 2 1. The query executed via phpMyAdmin FC5: Takes ~0.4s to execute and ~4s to start displaying the records U9.04: Takes ~0.6s to execute and ~40s to start displaying the records. Repeating the query SOMETIMES shorten this time to similar values as for FC5 so it looks like it is sometimes buffered. 2. Same query from the shell level: mysql -u user --password=xxx db query /dev/null takes a fraction of the second for both setups. So all the time is spent travelling back to the 'client' (phpmyadmin) and processing those results. The php-mysql bridge isn't very complicated, I doubt it's going to cause these sort of delays. I would suspect phpmyadmin purely because it has to process 50,000 rows, work out paging, display them, and so on. Is phpmyadmin on the same server as mysql? -- Postgresql php tutorials http://www.designmagick.com/ -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP-DB] slow mysql queries via php5-mysql
On 2009-07-30, Chris dmag...@gmail.com wrote: So all the time is spent travelling back to the 'client' (phpmyadmin) and processing those results. The php-mysql bridge isn't very complicated, I doubt it's going to cause these sort of delays. I would suspect phpmyadmin purely because it has to process 50,000 rows, work out paging, display them, and so on. Is phpmyadmin on the same server as mysql? Yes, but I daubt phpmyadmin is the culprit - a dedicated web interface I have written for the database has exactly the same problem. This interface works fast under the old version of php-/mysql and slow under the new one. The php code is the same. -- Marcin -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP-DB] slow mysql queries via php5-mysql
Marcin Debowski wrote: On 2009-07-30, Chris dmag...@gmail.com wrote: So all the time is spent travelling back to the 'client' (phpmyadmin) and processing those results. The php-mysql bridge isn't very complicated, I doubt it's going to cause these sort of delays. I would suspect phpmyadmin purely because it has to process 50,000 rows, work out paging, display them, and so on. Is phpmyadmin on the same server as mysql? Yes, but I daubt phpmyadmin is the culprit - a dedicated web interface I have written for the database has exactly the same problem. This interface works fast under the old version of php-/mysql and slow under the new one. The php code is the same. Can you run it on the same server as a test? That will rule out whether it's network related at least. Or do you have a cli script you can run to do the same thing? -- Postgresql php tutorials http://www.designmagick.com/ -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP-DB] slow mysql queries via php5-mysql
On 2009-07-30, Chris dmag...@gmail.com wrote: Marcin Debowski wrote: Yes, but I daubt phpmyadmin is the culprit - a dedicated web interface I have written for the database has exactly the same problem. This interface works fast under the old version of php-/mysql and slow under the new one. The php code is the same. Can you run it on the same server as a test? That will rule out whether it's network related at least. Mysql and apache are on the same physical server but it connects via 127.0.0.1. Or do you have a cli script you can run to do the same thing? I just tried to connect via the socket and I am not sure if this helped - seems slightly better but this could be sheer effect of the different connection route. I will try to run some more quantitative tests. -- Marcin -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP-DB] slow mysql queries via php5-mysql
Marcin Debowski wrote: On 2009-07-30, Chris dmag...@gmail.com wrote: Marcin Debowski wrote: Yes, but I daubt phpmyadmin is the culprit - a dedicated web interface I have written for the database has exactly the same problem. This interface works fast under the old version of php-/mysql and slow under the new one. The php code is the same. Can you run it on the same server as a test? That will rule out whether it's network related at least. Mysql and apache are on the same physical server but it connects via 127.0.0.1. So it's not network related, I thought they may have been different physical machines. Or do you have a cli script you can run to do the same thing? I just tried to connect via the socket and I am not sure if this helped - seems slightly better but this could be sheer effect of the different connection route. I will try to run some more quantitative tests. That suggestion was to see if cutting phpmyadmin out of the picture made a difference rather than testing the network theory. Plus, mysql_query buffers the results before sending them back to the client - which means mysql loads 50,000 records in to memory, then sends it to php. Are there any differences in (say) memory_limit settings for the two php setups, or any of the mysql specific settings in php.ini ? If you use an unbuffered query, does it make a difference (http://www.php.net/manual/en/function.mysql-unbuffered-query.php) ? -- Postgresql php tutorials http://www.designmagick.com/ -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
