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
Please Help. selectcol_arrayref problem
use DBI;
my $dbh = DBI-connect( DBI:mysql:rushload;192.168.0.1, $usrr, $passw, {
RaiseError = 3 } );
my $dbs = $dbh-selectcol_arrayref(show databases);
#my $dsn = dbi:mysql:information_schema:192.168.0.1:3306;
#my $dbh = DBI-connect($dsn, $usrr, $passw);
my $dbs = $dbh-selectcol_arrayref('show databases');
print @$dbs\n;
When I query the server for a list of databases with the code above it
returns the name of just two and there are over 10.
Any ideas?
Thanks
Re: Please Help. selectcol_arrayref problem
I did a GRANT REPLICATION SLAVE ON *.* TO 'user'@'192.168.0.23' IDENTIFIED
BY 'psswd';
on the master. Doesn't *.* mean everything? Why would it just show me to
databases?
2013/4/2 Larry Martell larry.mart...@gmail.com
On Tue, Apr 2, 2013 at 11:30 AM, Richard Reina gatorre...@gmail.com
wrote:
use DBI;
my $dbh = DBI-connect( DBI:mysql:rushload;192.168.0.1, $usrr, $passw,
{
RaiseError = 3 } );
my $dbs = $dbh-selectcol_arrayref(show databases);
#my $dsn = dbi:mysql:information_schema:192.168.0.1:3306;
#my $dbh = DBI-connect($dsn, $usrr, $passw);
my $dbs = $dbh-selectcol_arrayref('show databases');
print @$dbs\n;
When I query the server for a list of databases with the code above it
returns the name of just two and there are over 10.
Any ideas?
Permissions - the user you're logging in as probably only has
permission to see the 2 that are being returned.
Re: Please Help. selectcol_arrayref problem
On Tue, Apr 2, 2013 at 11:30 AM, Richard Reina gatorre...@gmail.com wrote:
use DBI;
my $dbh = DBI-connect( DBI:mysql:rushload;192.168.0.1, $usrr, $passw, {
RaiseError = 3 } );
my $dbs = $dbh-selectcol_arrayref(show databases);
#my $dsn = dbi:mysql:information_schema:192.168.0.1:3306;
#my $dbh = DBI-connect($dsn, $usrr, $passw);
my $dbs = $dbh-selectcol_arrayref('show databases');
print @$dbs\n;
When I query the server for a list of databases with the code above it
returns the name of just two and there are over 10.
Any ideas?
Permissions - the user you're logging in as probably only has
permission to see the 2 that are being returned.
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For list archives: http://lists.mysql.com/mysql
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Re: Please Help. selectcol_arrayref problem
Nope. That's just granting replication privileges so it can read updates
on all tables on all databases. It cannot select anything.
Why are you trying to connect with a replication slave user?
On 4/2/13 1:47 PM, Richard Reina gatorre...@gmail.com wrote:
I did a GRANT REPLICATION SLAVE ON *.* TO 'user'@'192.168.0.23'
IDENTIFIED
BY 'psswd';
on the master. Doesn't *.* mean everything? Why would it just show me to
databases?
2013/4/2 Larry Martell larry.mart...@gmail.com
On Tue, Apr 2, 2013 at 11:30 AM, Richard Reina gatorre...@gmail.com
wrote:
use DBI;
my $dbh = DBI-connect( DBI:mysql:rushload;192.168.0.1, $usrr,
$passw,
{
RaiseError = 3 } );
my $dbs = $dbh-selectcol_arrayref(show databases);
#my $dsn = dbi:mysql:information_schema:192.168.0.1:3306;
#my $dbh = DBI-connect($dsn, $usrr, $passw);
my $dbs = $dbh-selectcol_arrayref('show databases');
print @$dbs\n;
When I query the server for a list of databases with the code above it
returns the name of just two and there are over 10.
Any ideas?
Permissions - the user you're logging in as probably only has
permission to see the 2 that are being returned.
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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: All client commands to syslog?
2013/3/28 Rafał Radecki radecki.ra...@gmail.com Hi All. I have a production setup of four databases connected with replication. I would like to log every command that clients execute for auditing. Take a look at general query log it's exactly what you need. http://dev.mysql.com/doc/refman/5.5/en/query-log.html I've read http://www.percona.com/doc/percona-server/5.5/diagnostics/mysql_syslog.html?id=percona-server:features:mysql_syslogredirect=1#client-variables but despite the fact that I use percona Percona-Server-server-55-5.5.28-rel29.3.388.rhel6.x86_64 it does not seem to work. I've added syslog/syslog ON to my my.cnf server configuration file but no info about executed commands in logs. I've also read http://www.mysqlperformanceblog.com/2008/07/08/logging-your-mysql-command-line-client-sessions/ . What is the best way to log all client commands? Best regards, Rafal. -- 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
