Comments on: WPMu Multi-DB Tutorial

By: Girish

Girish — Thu, 11 Mar 2010 19:03:54 +0000

when i install multi-db plugin it shows Fatal error: Call to undefined function add_dc_ip() in /home/mumbaie1/public_html/gtubook.com/wp-content/plugins/1591308346_multi-db-2.6.0/db-config-sample-256.php on line 16

how can i resolve this? is there any versioning problem? please guide me

By: John

John — Sat, 12 Sep 2009 22:41:05 +0000

Could anyone post a video tutorial for installing multi-db in a fresh wordpress mu installation? I already bought a domain and hosting account at ixwebhosting and installed wordpress mu version 2.8.4a. I really need some help on this task. Thank you guys for your consideration

By: Alex

Alex — Fri, 20 Mar 2009 18:00:29 +0000

Nice to meet you Andrea. I think once we think this through a little more I will be giving you a call.

Best,
Alex

By: Reverend

Reverend — Wed, 18 Mar 2009 18:12:20 +0000

Alex,

Meet @Andrea_R, she rules I’m sure you have seen her around the forums, but she is the real deal, and is intimately familiar with this stuff. So, I would definitely look into optimizing BuddyPress—how to go about that is another question though.

Thanks for chiming in Andrea, when setups get that big—I am out of my element.

By: Andrea_R

Andrea_R — Wed, 18 Mar 2009 16:52:10 +0000

Alex, that sounds like enough to start – my only worry is BuddyPress. You have to cache & compress and optimize that sucker right from the start.

By: Alex

Alex — Wed, 18 Mar 2009 16:31:14 +0000

Thanks for the quick feedback Jim. I was wondering what kind of a load this would take because we have a client considering this for ~10,000 user community with WPMU/Buddypress (not so much blogs). Big day is 1,000 members logging in.

Curious if it can start out on the dedicated linux box that also hosts their e-commerce without impacting performance significantly. 4gb ram quad core linux w/latest apache,php,mysql as well as an empty hard drive.

Thanks,
Alex

By: Reverend

Reverend — Wed, 18 Mar 2009 14:36:38 +0000

Hey Alex,
Glad to be of service. I kept our install to 16 dbs because for 256 you would be scaling to the 10s of thousands and I don;t think, given the size of our school, we will get there anytime soon. So I decided to go smaller and scale up if need be.

We have this running on a dedicated Linux server with PHP 5+ and MySQL 5+ Apache, etc. The exact specs of the server I don;t have off hand, but can get them if you need it. we also do nightly backups on a remote server which is part of the sleep soundly program, and it is working out quite well so far.

By: Alex

Alex — Wed, 18 Mar 2009 07:34:26 +0000

Hello Jim,
First thanks for opening my eyes to WPMU and Buddypress. Saved us from an ugly Joomla hack.

My question for you is what can a 16DB structure realistically scale to as far as users? More importantly what kind of hardware are you running this install on?

Best,
Alex

By: Reverend

Reverend — Wed, 04 Mar 2009 21:57:23 +0000

D’Arcy, I had 18 databases, did you have a VIP database 16 others and a global? The global d for plugins and the like so they can spread across all the different dbs. The VIP might be good for the tags blog and your home blog. The other 16 you can just leave to chance.

I’m also confused in that section, what the “global-db”, “globaluser” and “globalpassword” parameters are for. Are they to identify the database name, username and password to use for that database server?

They are for a uber db-config file that all the dbs can call. I just used my existing db name, db username, and password, but you have to set this up in the move-blogs.php file. But it sounds like you did this cause it worked. Let me know where I can tighten this baby up.

By: D'Arcy Norman

D'Arcy Norman — Wed, 04 Mar 2009 21:51:36 +0000

I just ran a test migration on my desktop, and it appears to have been successful. I now have 17 databases (in addition to the old überdatabase) with what appear to be properly populated tables.

I’ll plan a migration of the server ASAP – it’s comforting to know that if it borks, I can just back out the multi-db files and go back to single überdatabase without losing anything.