Comments on: Is DNS the Achilles heel in your MySQL installation? http://www.mysqlperformanceblog.com/2008/05/31/dns-achilles-heel-mysql-installation/ Percona's MySQL & InnoDB performance and scalability blog Sat, 11 Feb 2012 16:45:54 +0000 hourly 1 http://wordpress.org/?v=3.2.1 By: Baron Schwartz http://www.mysqlperformanceblog.com/2008/05/31/dns-achilles-heel-mysql-installation/comment-page-1/#comment-813325 Baron Schwartz Tue, 16 Aug 2011 16:27:18 +0000 http://www.mysqlperformanceblog.com/?p=407#comment-813325 I haven't measured, but I doubt it makes a measurable difference. I haven’t measured, but I doubt it makes a measurable difference.

]]> By: Holger Thiel http://www.mysqlperformanceblog.com/2008/05/31/dns-achilles-heel-mysql-installation/comment-page-1/#comment-813318 Holger Thiel Tue, 16 Aug 2011 16:08:33 +0000 http://www.mysqlperformanceblog.com/?p=407#comment-813318 Hello, Is it a good idea to disable the host-cache if you do not use DNS resolving? The server should be a little response faster (or not?). The host-cache is also used for black listing. So black listing would be disabled. Regards, Holger Hello,

Is it a good idea to disable the host-cache if you do not use DNS resolving?

The server should be a little response faster (or not?).

The host-cache is also used for black listing. So black listing would be disabled.

Regards,
Holger

]]> By: John Marc http://www.mysqlperformanceblog.com/2008/05/31/dns-achilles-heel-mysql-installation/comment-page-1/#comment-346520 John Marc Tue, 19 Aug 2008 23:39:44 +0000 http://www.mysqlperformanceblog.com/?p=407#comment-346520 >Is there a way to verify that skip_name_resolve is set? One way is to grant access to a user using a domain name, restart mysql and look in the error log ex: 080819 14:29:06 [Warning] 'user' entry 'vbskin@cpvps%' ignored in --skip-name-resolve mode. >Is there a way to verify that skip_name_resolve is set?

One way is to grant access to a user using a domain name, restart mysql and look in the error log
ex:
080819 14:29:06 [Warning] ‘user’ entry ‘vbskin@cpvps%’ ignored in –skip-name-resolve mode.

]]> By: Jeremy Cole http://www.mysqlperformanceblog.com/2008/05/31/dns-achilles-heel-mysql-installation/comment-page-1/#comment-338716 Jeremy Cole Fri, 01 Aug 2008 18:52:21 +0000 http://www.mysqlperformanceblog.com/?p=407#comment-338716 Hi Baron, All, I wrote about these issues in some detail about two years ago: http://jcole.us/blog/archives/2006/04/26/on-ips-hostnames-and-mysql/ Regards, Jeremy Hi Baron, All,

I wrote about these issues in some detail about two years ago:

http://jcole.us/blog/archives/2006/04/26/on-ips-hostnames-and-mysql/

Regards,

Jeremy

]]> By: Jason Frisvold http://www.mysqlperformanceblog.com/2008/05/31/dns-achilles-heel-mysql-installation/comment-page-1/#comment-308329 Jason Frisvold Tue, 03 Jun 2008 18:47:46 +0000 http://www.mysqlperformanceblog.com/?p=407#comment-308329 Submitted. Bug #37168 Submitted. Bug #37168

]]> By: Jason Frisvold http://www.mysqlperformanceblog.com/2008/05/31/dns-achilles-heel-mysql-installation/comment-page-1/#comment-308325 Jason Frisvold Tue, 03 Jun 2008 18:36:18 +0000 http://www.mysqlperformanceblog.com/?p=407#comment-308325 Well, at least that confirms that I'm not completely crazy. :) I did check variable and global variables, but to no avail... I'll head over and submit a report right away! Well, at least that confirms that I’m not completely crazy. :) I did check variable and global variables, but to no avail… I’ll head over and submit a report right away!

]]> By: Baron Schwartz http://www.mysqlperformanceblog.com/2008/05/31/dns-achilles-heel-mysql-installation/comment-page-1/#comment-308303 Baron Schwartz Tue, 03 Jun 2008 17:47:57 +0000 http://www.mysqlperformanceblog.com/?p=407#comment-308303 Interesting: there is no variable for this in SHOW VARIABLES. You should submit a bug report. Interesting: there is no variable for this in SHOW VARIABLES. You should submit a bug report.

]]> By: Jason Frisvold http://www.mysqlperformanceblog.com/2008/05/31/dns-achilles-heel-mysql-installation/comment-page-1/#comment-308200 Jason Frisvold Tue, 03 Jun 2008 15:11:16 +0000 http://www.mysqlperformanceblog.com/?p=407#comment-308200 Is there a way to verify that skip_name_resolve is set? I have it set in the my.cnf file but I'd like to verify this from within MySQL itself. Is there a way to verify that skip_name_resolve is set? I have it set in the my.cnf file but I’d like to verify this from within MySQL itself.

]]> By: Erik Ljungstrom http://www.mysqlperformanceblog.com/2008/05/31/dns-achilles-heel-mysql-installation/comment-page-1/#comment-307780 Erik Ljungstrom Mon, 02 Jun 2008 17:45:38 +0000 http://www.mysqlperformanceblog.com/?p=407#comment-307780 Larger installations often end up needing cryptic hostnames á la db3.cluster2.datacenter3.example.com to make sense anyways. With some planning and a cunning subnetting scheme, I think IP addresses often end up more readable than their DNS counterpart regardless. Larger installations often end up needing cryptic hostnames á la db3.cluster2.datacenter3.example.com to make sense anyways. With some planning and a cunning subnetting scheme, I think IP addresses often end up more readable than their DNS counterpart regardless.

]]> By: Baron Schwartz http://www.mysqlperformanceblog.com/2008/05/31/dns-achilles-heel-mysql-installation/comment-page-1/#comment-307625 Baron Schwartz Mon, 02 Jun 2008 11:18:29 +0000 http://www.mysqlperformanceblog.com/?p=407#comment-307625 Jeff, "How well does the mysql hostname cache work? I thought mysql cached hostnames internally?" It does, and it's actually kind of buggy itself, plus it's hard to manage. And in other news, I just got another emergency call that turned out to be DNS issues. Jeff, “How well does the mysql hostname cache work? I thought mysql cached hostnames internally?” It does, and it’s actually kind of buggy itself, plus it’s hard to manage.

And in other news, I just got another emergency call that turned out to be DNS issues.

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