Re: How to change max simultaneous connection parameter in mysql.
2013/3/24 Reindl Harald h.rei...@thelounge.net Am 24.03.2013 05:20, schrieb spameden: 2013/3/19 Rick James rja...@yahoo-inc.com: you never have hosted a large site Check my email address before saying that. :D as said, big company does not have only geniusses I do not judge only on 1 parameter, Rick has been constantly helping here and I'm pretty sure he has more knowledge on MySQL than you. 20 may be low, but 100 is rather high. Never use apache2 it has so many problems under load.. if you are too supid to configure it yes Ever heard about Slow HTTP DoS attack? The best combo is php5-fpm+nginx. Handles loads of users at once if well tuned Apache 2.4 handles the load of 600 parallel executed php-scripts from our own CMS-system Nginx serves static content way better than apache2 (did few benchmarks already). nginx+php5-fpm handles better load than apache2-prefork+mod_php you can google benchmarks if you dont trust me also nginx eats much less memory than apache2 php5-fpm can be tuned as well to suit your needs if you have lots of dynamic content maybe you guys should learn what a opcode-cache is and how to compile and optimize software (binaries and config) o'rly?
Re: How to change max simultaneous connection parameter in mysql.
Am 02.04.2013 16:09, schrieb spameden: 2013/3/24 Reindl Harald h.rei...@thelounge.net mailto:h.rei...@thelounge.net Am 24.03.2013 05:20, schrieb spameden: 2013/3/19 Rick James rja...@yahoo-inc.com mailto:rja...@yahoo-inc.com: you never have hosted a large site Check my email address before saying that. :D as said, big company does not have only geniusses I do not judge only on 1 parameter, Rick has been constantly helping here and I'm pretty sure he has more knowledge on MySQL than you. but the MySQL knowledge alone is not enough in context of a webserver not to say irrelevant 20 may be low, but 100 is rather high. Never use apache2 it has so many problems under load.. if you are too supid to configure it yes Ever heard about Slow HTTP DoS attack? my config says yes as i heard about many things because it is my daily job 0 0 LOGtcp -- eth0 * !local-network/24 0.0.0.0/0multiport dports 80,443 tcpflags: 0x17/0x02 #conn src/32 50 limit: avg 100/hour burst 5 LOG flags 0 level 7 prefix Firewall Slowloris: 0 0 DROP tcp -- eth0 * !local-network/24 0.0.0.0/0multiport dports 80,443 tcpflags: 0x17/0x02 #conn src/32 50 signature.asc Description: OpenPGP digital signature
Re: How to change max simultaneous connection parameter in mysql.
Am 02.04.2013 22:56, schrieb Rick James: I hear that nginx is very fast for a certain class of web serving. yes But what happens if a web page needs to do a SELECT? what should happen? Is nginx single-threaded, thereby sitting idle waiting for the SELECT? why should it do that? And, should you run 8 nginx web servers on an 8-core box? why should you do that? http://en.wikipedia.org/wiki/Nginx nginx uses an asynchronous event-driven approach to handling requests -Original Message- From: spameden [mailto:spame...@gmail.com] Sent: Tuesday, April 02, 2013 7:10 AM To: Reindl Harald Cc: mysql@lists.mysql.com Subject: Re: How to change max simultaneous connection parameter in mysql. 2013/3/24 Reindl Harald h.rei...@thelounge.net Am 24.03.2013 05:20, schrieb spameden: 2013/3/19 Rick James rja...@yahoo-inc.com: you never have hosted a large site Check my email address before saying that. :D as said, big company does not have only geniusses I do not judge only on 1 parameter, Rick has been constantly helping here and I'm pretty sure he has more knowledge on MySQL than you. 20 may be low, but 100 is rather high. Never use apache2 it has so many problems under load.. if you are too supid to configure it yes Ever heard about Slow HTTP DoS attack? The best combo is php5-fpm+nginx. Handles loads of users at once if well tuned Apache 2.4 handles the load of 600 parallel executed php-scripts from our own CMS-system Nginx serves static content way better than apache2 (did few benchmarks already). nginx+php5-fpm handles better load than apache2-prefork+mod_php you can google benchmarks if you dont trust me also nginx eats much less memory than apache2 php5-fpm can be tuned as well to suit your needs if you have lots of dynamic content maybe you guys should learn what a opcode-cache is and how to compile and optimize software (binaries and config) o'rly? signature.asc Description: OpenPGP digital signature
RE: How to change max simultaneous connection parameter in mysql.
(Thanks for the comment, spameden.) Well, I was going to drop the thread, but he baited me. I _do_ know something about web serving... Should I recount the number of times I have traced a database meltdown back to MaxClients being too big? They are _ugly_ meltdowns -- hundreds of point-queries stumbling over themselves, flooding the slowlog with queries that should never take more than milliseconds. More and more db requests come in, non finishing, thereby stalling the web server threads, etc. Another point to make -- once a web server (Apache or...) has saturated the CPU (or other shared resource), there is really no advantage, only disadvantage, in starting more web pages. The will simply contend for the saturated resource, thereby slowing down _all_ threads. It is better (at this point) to queue up (or drop) further requests, thereby giving the CPU a chance to actually finish something. Yet another point... If [ SUM(MaxClients) over the web servers you have ] [ SUM(max_connections) over the Slaves ], then you are threatening to have mysql refuse connections; this probably leads to broken web pages, maybe even 404s or 500s. Granted, you have (at least) 3 choices: decrease MaxClients, increase max_connections, or add more Slaves. If mysql has most of max_connections _actively_ running querieds, then it is probably stumbling badly, so I vote against increasing that. Adding a Slave cannot be done 'instantly'. That leaves decreasing MaxClients, which is quick and easy. Furthermore, the SE (in one of the meltdowns) killed Apache; this led to a prompt clear up of all the issues -- poor web response, mysql melting down, etc. Sometimes less is better! -Original Message- From: Reindl Harald [mailto:h.rei...@thelounge.net] Sent: Tuesday, April 02, 2013 8:29 AM To: mysql@lists.mysql.com Subject: Re: How to change max simultaneous connection parameter in mysql. Am 02.04.2013 16:09, schrieb spameden: 2013/3/24 Reindl Harald h.rei...@thelounge.net mailto:h.rei...@thelounge.net Am 24.03.2013 05:20, schrieb spameden: 2013/3/19 Rick James rja...@yahoo-inc.com mailto:rja...@yahoo-inc.com: you never have hosted a large site Check my email address before saying that. :D as said, big company does not have only geniusses I do not judge only on 1 parameter, Rick has been constantly helping here and I'm pretty sure he has more knowledge on MySQL than you. but the MySQL knowledge alone is not enough in context of a webserver not to say irrelevant 20 may be low, but 100 is rather high. Never use apache2 it has so many problems under load.. if you are too supid to configure it yes Ever heard about Slow HTTP DoS attack? my config says yes as i heard about many things because it is my daily job 0 0 LOGtcp -- eth0 * !local-network/24 0.0.0.0/0multiport dports 80,443 tcpflags: 0x17/0x02 #conn src/32 50 limit: avg 100/hour burst 5 LOG flags 0 level 7 prefix Firewall Slowloris: 0 0 DROP tcp -- eth0 * !local-network/24 0.0.0.0/0multiport dports 80,443 tcpflags: 0x17/0x02 #conn src/32 50 -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql
Re: How to change max simultaneous connection parameter in mysql.
Am 02.04.2013 23:15, schrieb Rick James: SELECT is not performed in the same thread as nginx; it is performed in another process, or even (in big web setups) in a different host. Therefore, nginx would be in some form of wait state, thereby not really using the CPU. tell me something new -Original Message- From: Reindl Harald [mailto:h.rei...@thelounge.net] Sent: Tuesday, April 02, 2013 2:00 PM To: mysql@lists.mysql.com Subject: Re: How to change max simultaneous connection parameter in mysql. Am 02.04.2013 22:56, schrieb Rick James: I hear that nginx is very fast for a certain class of web serving. yes But what happens if a web page needs to do a SELECT? what should happen? Is nginx single-threaded, thereby sitting idle waiting for the SELECT? why should it do that? And, should you run 8 nginx web servers on an 8-core box? why should you do that? http://en.wikipedia.org/wiki/Nginx nginx uses an asynchronous event-driven approach to handling requests -Original Message- From: spameden [mailto:spame...@gmail.com] Sent: Tuesday, April 02, 2013 7:10 AM To: Reindl Harald Cc: mysql@lists.mysql.com Subject: Re: How to change max simultaneous connection parameter in mysql. 2013/3/24 Reindl Harald h.rei...@thelounge.net Am 24.03.2013 05:20, schrieb spameden: 2013/3/19 Rick James rja...@yahoo-inc.com: you never have hosted a large site Check my email address before saying that. :D as said, big company does not have only geniusses I do not judge only on 1 parameter, Rick has been constantly helping here and I'm pretty sure he has more knowledge on MySQL than you. 20 may be low, but 100 is rather high. Never use apache2 it has so many problems under load.. if you are too supid to configure it yes Ever heard about Slow HTTP DoS attack? The best combo is php5-fpm+nginx. Handles loads of users at once if well tuned Apache 2.4 handles the load of 600 parallel executed php-scripts from our own CMS-system Nginx serves static content way better than apache2 (did few benchmarks already). nginx+php5-fpm handles better load than apache2-prefork+mod_php you can google benchmarks if you dont trust me also nginx eats much less memory than apache2 php5-fpm can be tuned as well to suit your needs if you have lots of dynamic content maybe you guys should learn what a opcode-cache is and how to compile and optimize software (binaries and config) o'rly? signature.asc Description: OpenPGP digital signature
RE: How to change max simultaneous connection parameter in mysql.
SELECT is not performed in the same thread as nginx; it is performed in another process, or even (in big web setups) in a different host. Therefore, nginx would be in some form of wait state, thereby not really using the CPU. -Original Message- From: Reindl Harald [mailto:h.rei...@thelounge.net] Sent: Tuesday, April 02, 2013 2:00 PM To: mysql@lists.mysql.com Subject: Re: How to change max simultaneous connection parameter in mysql. Am 02.04.2013 22:56, schrieb Rick James: I hear that nginx is very fast for a certain class of web serving. yes But what happens if a web page needs to do a SELECT? what should happen? Is nginx single-threaded, thereby sitting idle waiting for the SELECT? why should it do that? And, should you run 8 nginx web servers on an 8-core box? why should you do that? http://en.wikipedia.org/wiki/Nginx nginx uses an asynchronous event-driven approach to handling requests -Original Message- From: spameden [mailto:spame...@gmail.com] Sent: Tuesday, April 02, 2013 7:10 AM To: Reindl Harald Cc: mysql@lists.mysql.com Subject: Re: How to change max simultaneous connection parameter in mysql. 2013/3/24 Reindl Harald h.rei...@thelounge.net Am 24.03.2013 05:20, schrieb spameden: 2013/3/19 Rick James rja...@yahoo-inc.com: you never have hosted a large site Check my email address before saying that. :D as said, big company does not have only geniusses I do not judge only on 1 parameter, Rick has been constantly helping here and I'm pretty sure he has more knowledge on MySQL than you. 20 may be low, but 100 is rather high. Never use apache2 it has so many problems under load.. if you are too supid to configure it yes Ever heard about Slow HTTP DoS attack? The best combo is php5-fpm+nginx. Handles loads of users at once if well tuned Apache 2.4 handles the load of 600 parallel executed php-scripts from our own CMS-system Nginx serves static content way better than apache2 (did few benchmarks already). nginx+php5-fpm handles better load than apache2-prefork+mod_php you can google benchmarks if you dont trust me also nginx eats much less memory than apache2 php5-fpm can be tuned as well to suit your needs if you have lots of dynamic content maybe you guys should learn what a opcode-cache is and how to compile and optimize software (binaries and config) o'rly? -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql
RE: How to change max simultaneous connection parameter in mysql.
I hear that nginx is very fast for a certain class of web serving. But what happens if a web page needs to do a SELECT? Is nginx single-threaded, thereby sitting idle waiting for the SELECT? And, should you run 8 nginx web servers on an 8-core box? -Original Message- From: spameden [mailto:spame...@gmail.com] Sent: Tuesday, April 02, 2013 7:10 AM To: Reindl Harald Cc: mysql@lists.mysql.com Subject: Re: How to change max simultaneous connection parameter in mysql. 2013/3/24 Reindl Harald h.rei...@thelounge.net Am 24.03.2013 05:20, schrieb spameden: 2013/3/19 Rick James rja...@yahoo-inc.com: you never have hosted a large site Check my email address before saying that. :D as said, big company does not have only geniusses I do not judge only on 1 parameter, Rick has been constantly helping here and I'm pretty sure he has more knowledge on MySQL than you. 20 may be low, but 100 is rather high. Never use apache2 it has so many problems under load.. if you are too supid to configure it yes Ever heard about Slow HTTP DoS attack? The best combo is php5-fpm+nginx. Handles loads of users at once if well tuned Apache 2.4 handles the load of 600 parallel executed php-scripts from our own CMS-system Nginx serves static content way better than apache2 (did few benchmarks already). nginx+php5-fpm handles better load than apache2-prefork+mod_php you can google benchmarks if you dont trust me also nginx eats much less memory than apache2 php5-fpm can be tuned as well to suit your needs if you have lots of dynamic content maybe you guys should learn what a opcode-cache is and how to compile and optimize software (binaries and config) o'rly? -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql
Re: How to change max simultaneous connection parameter in mysql.
2013/4/3 Rick James rja...@yahoo-inc.com SELECT is not performed in the same thread as nginx; it is performed in another process, or even (in big web setups) in a different host. Therefore, nginx would be in some form of wait state, thereby not really using the CPU. ofc select is not performed in nginx thread, nginx acts as a proxying server and just passes the request to the backend it's entirely depends on your backend how fast it's gonna process certain SELECT and ofc depends on what kind of database you've got if backend takes too long to respond nginx just shows 502 error with timeout from backend (by default: 30s). good practice is to have multiple backends behind load balancer, so under huge load no single request would be lost. -Original Message- From: Reindl Harald [mailto:h.rei...@thelounge.net] Sent: Tuesday, April 02, 2013 2:00 PM To: mysql@lists.mysql.com Subject: Re: How to change max simultaneous connection parameter in mysql. Am 02.04.2013 22:56, schrieb Rick James: I hear that nginx is very fast for a certain class of web serving. yes But what happens if a web page needs to do a SELECT? what should happen? Is nginx single-threaded, thereby sitting idle waiting for the SELECT? nginx is multi threaded and it supports SMP architecture, there is main process which controls everything and nginx configuration can be reloaded with zero downtime. I saw multiple test where under load (simple DDoS simulation attack like there where 40k bots hitting the site at once) nginx+php5-fpm dropped much less requests than apache2 + mod_php. apache2 is so bad at eating memory and system resources. why should it do that? And, should you run 8 nginx web servers on an 8-core box? no, you just tune worker_processes 8; why should you do that? http://en.wikipedia.org/wiki/Nginx nginx uses an asynchronous event-driven approach to handling requests -Original Message- From: spameden [mailto:spame...@gmail.com] Sent: Tuesday, April 02, 2013 7:10 AM To: Reindl Harald Cc: mysql@lists.mysql.com Subject: Re: How to change max simultaneous connection parameter in mysql. 2013/3/24 Reindl Harald h.rei...@thelounge.net Am 24.03.2013 05:20, schrieb spameden: 2013/3/19 Rick James rja...@yahoo-inc.com: you never have hosted a large site Check my email address before saying that. :D as said, big company does not have only geniusses I do not judge only on 1 parameter, Rick has been constantly helping here and I'm pretty sure he has more knowledge on MySQL than you. 20 may be low, but 100 is rather high. Never use apache2 it has so many problems under load.. if you are too supid to configure it yes Ever heard about Slow HTTP DoS attack? The best combo is php5-fpm+nginx. Handles loads of users at once if well tuned Apache 2.4 handles the load of 600 parallel executed php-scripts from our own CMS-system Nginx serves static content way better than apache2 (did few benchmarks already). nginx+php5-fpm handles better load than apache2-prefork+mod_php you can google benchmarks if you dont trust me also nginx eats much less memory than apache2 php5-fpm can be tuned as well to suit your needs if you have lots of dynamic content maybe you guys should learn what a opcode-cache is and how to compile and optimize software (binaries and config) o'rly? -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql
Re: How to change max simultaneous connection parameter in mysql.
Am 02.04.2013 23:14, schrieb Rick James: (Thanks for the comment, spameden.) Well, I was going to drop the thread, but he baited me. I _do_ know something about web serving... maybe Should I recount the number of times I have traced a database meltdown back to MaxClients being too big? They are _ugly_ meltdowns -- hundreds of point-queries stumbling over themselves, flooding the slowlog with queries that should never take more than milliseconds. More and more db requests come in, non finishing, thereby stalling the web server threads, etc. been there, done that it is a matter of the application design to avoid deadlocks in such cases Another point to make -- once a web server (Apache or...) has saturated the CPU (or other shared resource), there is really no advantage, only disadvantage, in starting more web pages. The will simply contend for the saturated resource, thereby slowing down _all_ threads. It is better (at this point) to queue up (or drop) further requests, thereby giving the CPU a chance to actually finish something. but with 20-100 requests a webserver these days is NOT saturated MaxClients 20 is laughable i had a high trafic site with MaxClients set to 500, driven with our CMS-system teh CPU load was at 80% and the page got damned slow because you have to wait before your images could be loaded after raise MacClients to 600 it ran smooth, the CPU was around 85% again: 20-100 MaxClients is laughable and only suiteable for a dedicated, low-powered machine hosting only one domain Yet another point... If [ SUM(MaxClients) over the web servers you have ] [ SUM(max_connections) over the Slaves ], then you are threatening to have mysql refuse connections no, my db-layer is traing again for some times and the chance to get a free slot because other workers are serving images is proven in practice damned high -Original Message- From: Reindl Harald [mailto:h.rei...@thelounge.net] Sent: Tuesday, April 02, 2013 8:29 AM To: mysql@lists.mysql.com Subject: Re: How to change max simultaneous connection parameter in mysql. Am 02.04.2013 16:09, schrieb spameden: 2013/3/24 Reindl Harald h.rei...@thelounge.net mailto:h.rei...@thelounge.net Am 24.03.2013 05:20, schrieb spameden: 2013/3/19 Rick James rja...@yahoo-inc.com mailto:rja...@yahoo-inc.com: you never have hosted a large site Check my email address before saying that. :D as said, big company does not have only geniusses I do not judge only on 1 parameter, Rick has been constantly helping here and I'm pretty sure he has more knowledge on MySQL than you. but the MySQL knowledge alone is not enough in context of a webserver not to say irrelevant 20 may be low, but 100 is rather high. Never use apache2 it has so many problems under load.. if you are too supid to configure it yes Ever heard about Slow HTTP DoS attack? my config says yes as i heard about many things because it is my daily job 0 0 LOGtcp -- eth0 * !local-network/24 0.0.0.0/0multiport dports 80,443 tcpflags: 0x17/0x02 #conn src/32 50 limit: avg 100/hour burst 5 LOG flags 0 level 7 prefix Firewall Slowloris: 0 0 DROP tcp -- eth0 * !local-network/24 0.0.0.0/0multiport dports 80,443 tcpflags: 0x17/0x02 #conn src/32 50 signature.asc Description: OpenPGP digital signature
Re: How to change max simultaneous connection parameter in mysql.
Am 24.03.2013 05:20, schrieb spameden: 2013/3/19 Rick James rja...@yahoo-inc.com: you never have hosted a large site Check my email address before saying that. :D as said, big company does not have only geniusses 20 may be low, but 100 is rather high. Never use apache2 it has so many problems under load.. if you are too supid to configure it yes The best combo is php5-fpm+nginx. Handles loads of users at once if well tuned Apache 2.4 handles the load of 600 parallel executed php-scripts from our own CMS-system maybe you guys should learn what a opcode-cache is and how to compile and optimize software (binaries and config) signature.asc Description: OpenPGP digital signature
Re: How to change max simultaneous connection parameter in mysql.
2013/3/24 Reindl Harald h.rei...@thelounge.net Am 24.03.2013 05:20, schrieb spameden: 2013/3/19 Rick James rja...@yahoo-inc.com: you never have hosted a large site Check my email address before saying that. :D as said, big company does not have only geniusses 20 may be low, but 100 is rather high. Never use apache2 it has so many problems under load.. if you are too supid to configure it yes The best combo is php5-fpm+nginx. Handles loads of users at once if well tuned Apache 2.4 handles the load of 600 parallel executed php-scripts from our own CMS-system maybe you guys should learn what a opcode-cache is and how to compile and optimize software (binaries and config) And maybe you should learn some good manners.
Re: How to change max simultaneous connection parameter in mysql.
2013/3/19 Rick James rja...@yahoo-inc.com: you never have hosted a large site Check my email address before saying that. :D 20 may be low, but 100 is rather high. Never use apache2 it has so many problems under load.. The best combo is php5-fpm+nginx. Handles loads of users at once if well tuned. -Original Message- From: Reindl Harald [mailto:h.rei...@thelounge.net] Sent: Monday, March 18, 2013 1:36 PM To: mysql@lists.mysql.com Subject: Re: How to change max simultaneous connection parameter in mysql. Am 18.03.2013 21:01, schrieb Rick James: 20 is plenty if your pages run fast enough it is not you never have hosted a large site Excess clients after MaxClients are queued in Apache so what - it doe snot help you been there, done that if you have some hundret USERS at the same time any every of them is requesting the same page with a lot of images you are simply DEAD with a limit of 20 in your configuration If the 20 are consuming resources (eg cpu/disk) it is better to queue the excess than to have everybody stumbling over each other. if your server can not serve more than 20 simultaionous requests you are not doing any serious things sorry, 20 can be done with any crappy notebook these days In MySQL, the excess clients beyond max_connections are give an error. -Original Message- From: Reindl Harald [mailto:h.rei...@thelounge.net] Sent: Monday, March 18, 2013 12:15 PM To: mysql@lists.mysql.com Subject: Re: How to change max simultaneous connection parameter in mysql. Am 18.03.2013 19:26, schrieb Rick James: If you are running Apache with MaxClients set too high, that can cause the problem. too high is relative That Apache setting should be something like 20. (Other web servers have similar settings.) 20 is a laughable value as long you are not hosting only sites with no users at all i have seen MaxClients 500 be critical while the hardware was not overloaded and we had THOUSANDS of users which liked to get the website with all it's images, no way with stupid settings of 20 which means only ONE USER at the same time can fetch a single page with images and stylesheets -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql
Re: How to change max simultaneous connection parameter in mysql.
Am 19.03.2013 01:18, schrieb Rick James: you never have hosted a large site Check my email address before saying that. yahoo - so what this is a large enough copmany that i am still sure you never was allowed to touch a webserver for production 20 may be low, but 100 is rather high you do relly not understand it * i had a project with a large amoutn of parallel users * the MaxClients was up to 400 * the page-loading was UNACCEPTABLE slow * after raise up the limit to 600 it got acceptable * yes the hardware was able to satisfy the requests * yes you need a LOT of memory and CPU so please get rid of your i386 and stop to explain me the world -Original Message- From: Reindl Harald [mailto:h.rei...@thelounge.net] Sent: Monday, March 18, 2013 1:36 PM To: mysql@lists.mysql.com Subject: Re: How to change max simultaneous connection parameter in mysql. Am 18.03.2013 21:01, schrieb Rick James: 20 is plenty if your pages run fast enough it is not you never have hosted a large site Excess clients after MaxClients are queued in Apache so what - it doe snot help you been there, done that if you have some hundret USERS at the same time any every of them is requesting the same page with a lot of images you are simply DEAD with a limit of 20 in your configuration If the 20 are consuming resources (eg cpu/disk) it is better to queue the excess than to have everybody stumbling over each other. if your server can not serve more than 20 simultaionous requests you are not doing any serious things sorry, 20 can be done with any crappy notebook these days In MySQL, the excess clients beyond max_connections are give an error. -Original Message- From: Reindl Harald [mailto:h.rei...@thelounge.net] Sent: Monday, March 18, 2013 12:15 PM To: mysql@lists.mysql.com Subject: Re: How to change max simultaneous connection parameter in mysql. Am 18.03.2013 19:26, schrieb Rick James: If you are running Apache with MaxClients set too high, that can cause the problem. too high is relative That Apache setting should be something like 20. (Other web servers have similar settings.) 20 is a laughable value as long you are not hosting only sites with no users at all i have seen MaxClients 500 be critical while the hardware was not overloaded and we had THOUSANDS of users which liked to get the website with all it's images, no way with stupid settings of 20 which means only ONE USER at the same time can fetch a single page with images and stylesheets signature.asc Description: OpenPGP digital signature
Re: How to change max simultaneous connection parameter in mysql.
Am 18.03.2013 19:26, schrieb Rick James: If you are running Apache with MaxClients set too high, that can cause the problem. too high is relative That Apache setting should be something like 20. (Other web servers have similar settings.) 20 is a laughable value as long you are not hosting only sites with no users at all i have seen MaxClients 500 be critical while the hardware was not overloaded and we had THOUSANDS of users which liked to get the website with all it's images, no way with stupid settings of 20 which means only ONE USER at the same time can fetch a single page with images and stylesheets signature.asc Description: OpenPGP digital signature
RE: How to change max simultaneous connection parameter in mysql.
20 is plenty if your pages run fast enough. Excess clients after MaxClients are queued in Apache. If the 20 are consuming resources (eg cpu/disk) it is better to queue the excess than to have everybody stumbling over each other. In MySQL, the excess clients beyond max_connections are give an error. -Original Message- From: Reindl Harald [mailto:h.rei...@thelounge.net] Sent: Monday, March 18, 2013 12:15 PM To: mysql@lists.mysql.com Subject: Re: How to change max simultaneous connection parameter in mysql. Am 18.03.2013 19:26, schrieb Rick James: If you are running Apache with MaxClients set too high, that can cause the problem. too high is relative That Apache setting should be something like 20. (Other web servers have similar settings.) 20 is a laughable value as long you are not hosting only sites with no users at all i have seen MaxClients 500 be critical while the hardware was not overloaded and we had THOUSANDS of users which liked to get the website with all it's images, no way with stupid settings of 20 which means only ONE USER at the same time can fetch a single page with images and stylesheets -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql
Re: How to change max simultaneous connection parameter in mysql.
Am 18.03.2013 21:01, schrieb Rick James: 20 is plenty if your pages run fast enough it is not you never have hosted a large site Excess clients after MaxClients are queued in Apache so what - it doe snot help you been there, done that if you have some hundret USERS at the same time any every of them is requesting the same page with a lot of images you are simply DEAD with a limit of 20 in your configuration If the 20 are consuming resources (eg cpu/disk) it is better to queue the excess than to have everybody stumbling over each other. if your server can not serve more than 20 simultaionous requests you are not doing any serious things sorry, 20 can be done with any crappy notebook these days In MySQL, the excess clients beyond max_connections are give an error. -Original Message- From: Reindl Harald [mailto:h.rei...@thelounge.net] Sent: Monday, March 18, 2013 12:15 PM To: mysql@lists.mysql.com Subject: Re: How to change max simultaneous connection parameter in mysql. Am 18.03.2013 19:26, schrieb Rick James: If you are running Apache with MaxClients set too high, that can cause the problem. too high is relative That Apache setting should be something like 20. (Other web servers have similar settings.) 20 is a laughable value as long you are not hosting only sites with no users at all i have seen MaxClients 500 be critical while the hardware was not overloaded and we had THOUSANDS of users which liked to get the website with all it's images, no way with stupid settings of 20 which means only ONE USER at the same time can fetch a single page with images and stylesheets signature.asc Description: OpenPGP digital signature
Re: How to change max simultaneous connection parameter in mysql.
On Mon, 2013-03-18 at 21:35 +0100, Reindl Harald wrote: Am 18.03.2013 21:01, schrieb Rick James: 20 is plenty if your pages run fast enough if your server can not serve more than 20 simultaionous requests you are not doing any serious things or he's using a 286 signature.asc Description: This is a digitally signed message part
RE: How to change max simultaneous connection parameter in mysql.
If you are running Apache with MaxClients set too high, that can cause the problem. That Apache setting should be something like 20. (Other web servers have similar settings.) -Original Message- From: Igor Shevtsov [mailto:nixofort...@gmail.com] Sent: Saturday, March 16, 2013 1:45 AM To: mysql@lists.mysql.com Subject: Re: How to change max simultaneous connection parameter in mysql. Hi Kevin, In your MySQL client pls execute: SET GLOBAL max_connections = 200; To Make the change permanent you can edit /etc/my.cnf or whatever MySQL config file you you've got in your system Look for this line max_connections under [mysqld] secction, add it if it's not in the config. make sure it looks like: max_connections = 200 No MySQL restart required Cheers, Igor On 16/03/13 07:39, Manuel Arostegui wrote: 2013/3/16 Kevin Peterson qh.res...@gmail.com I am using PHP along with mysql. Mysql default configuration allows to have 100 simultaneous connection which I want to chane to 200. Please help. If you're reaching too many connections quite often, this change can imply memory problems in your server. If you are close to get your server to swap...be careful with this parameter as any swapping will affect your performance. Manuel. -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql
RE: How to change max simultaneous connection parameter in mysql.
you never have hosted a large site Check my email address before saying that. 20 may be low, but 100 is rather high. -Original Message- From: Reindl Harald [mailto:h.rei...@thelounge.net] Sent: Monday, March 18, 2013 1:36 PM To: mysql@lists.mysql.com Subject: Re: How to change max simultaneous connection parameter in mysql. Am 18.03.2013 21:01, schrieb Rick James: 20 is plenty if your pages run fast enough it is not you never have hosted a large site Excess clients after MaxClients are queued in Apache so what - it doe snot help you been there, done that if you have some hundret USERS at the same time any every of them is requesting the same page with a lot of images you are simply DEAD with a limit of 20 in your configuration If the 20 are consuming resources (eg cpu/disk) it is better to queue the excess than to have everybody stumbling over each other. if your server can not serve more than 20 simultaionous requests you are not doing any serious things sorry, 20 can be done with any crappy notebook these days In MySQL, the excess clients beyond max_connections are give an error. -Original Message- From: Reindl Harald [mailto:h.rei...@thelounge.net] Sent: Monday, March 18, 2013 12:15 PM To: mysql@lists.mysql.com Subject: Re: How to change max simultaneous connection parameter in mysql. Am 18.03.2013 19:26, schrieb Rick James: If you are running Apache with MaxClients set too high, that can cause the problem. too high is relative That Apache setting should be something like 20. (Other web servers have similar settings.) 20 is a laughable value as long you are not hosting only sites with no users at all i have seen MaxClients 500 be critical while the hardware was not overloaded and we had THOUSANDS of users which liked to get the website with all it's images, no way with stupid settings of 20 which means only ONE USER at the same time can fetch a single page with images and stylesheets -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql
Re: How to change max simultaneous connection parameter in mysql.
2013/3/16 Kevin Peterson qh.res...@gmail.com I am using PHP along with mysql. Mysql default configuration allows to have 100 simultaneous connection which I want to chane to 200. Please help. If you're reaching too many connections quite often, this change can imply memory problems in your server. If you are close to get your server to swap...be careful with this parameter as any swapping will affect your performance. Manuel. -- Manuel Aróstegui Systems Team tuenti.com
Re: How to change max simultaneous connection parameter in mysql.
Hi Kevin, In your MySQL client pls execute: SET GLOBAL max_connections = 200; To Make the change permanent you can edit /etc/my.cnf or whatever MySQL config file you you've got in your system Look for this line max_connections under [mysqld] secction, add it if it's not in the config. make sure it looks like: max_connections = 200 No MySQL restart required Cheers, Igor On 16/03/13 07:39, Manuel Arostegui wrote: 2013/3/16 Kevin Peterson qh.res...@gmail.com I am using PHP along with mysql. Mysql default configuration allows to have 100 simultaneous connection which I want to chane to 200. Please help. If you're reaching too many connections quite often, this change can imply memory problems in your server. If you are close to get your server to swap...be careful with this parameter as any swapping will affect your performance. Manuel. -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql
