Comments on: Scaling WordPress MU with multiple databases

By: Dr. Kenneth Noisewater

Dr. Kenneth Noisewater — Fri, 19 Nov 2010 18:47:39 +0000

BTW, is WP or WPMU compatible with MySQL multimaster replication (MMR)? A theoretical use for that would be to have one or more masters at more than 1 site MMR with each other, then hang slaves off of them, and have HyperDB or SharDB split read/write traffic among them.

This requires a bit of discipline when it comes to insert/replace as Mysql’s auto_increment indexes are handled by MMR, and I’ve seen code (such as Gallery2) have issues with MMR as it didn’t use auto_increment and would otherwise have had to been hacked with MMR coherence in mind.

By: Erock

Erock — Sun, 26 Sep 2010 20:03:42 +0000

Hi,
I was playing with SharDB last night and had a few minor issues. So, here I am today with a few minor questions.
First, there’s still no migration script correct? Should I export/import my db tables manually? or could I grab the script from the wpmu dev multi-db plugin, and give that a go?
Also, it was mentioned that SharDb is incompatible with ‘new blog defaults’ plugin, and I believe you confirmed this. I see SharDB is listed as having been tested with over 50 plugins, but you don’t mention the outcome of these trials. I am very curious if you have a running list of tests and their results..
Thank you for your time,
-Erik

P.s I love your custom captcha images! I think we all agree, Andrea Rocks!

By: charlie

charlie — Tue, 21 Sep 2010 07:11:32 +0000

Hello!

Use this: http://wordpress.org/extend/plugins/wp-super-cache/

By: Ed

Ed — Mon, 20 Sep 2010 19:54:04 +0000

Is there anyway to run WP 3 (not networked) with multiple DB’s? I have a site thats gotten into the 100,000 post range and its pretty much dead in the water when it comes to page load times.

We were going to use MU, but a bunch of plugins we needed couldn’t handle the database tables being named differently in MU.

Thanks!

By: Ron

Ron — Mon, 06 Sep 2010 04:30:55 +0000

SharDB will look for the user tables in the global DB unless you define CUSTOM_USER_TABLE & CUSTOM_USER_META_TABLE.

By: Jan

Jan — Sun, 05 Sep 2010 09:16:55 +0000

Hi Ron
Great script. Got it working but just got one question. I need to setup a wp_users table for one specific vip blog Can I just create a table wp_users and wp_usermeta for that VIP db Or will it always use the users from the default home db

Hope this makes sense
Thanks a Mill

By: Alok Sharma

Alok Sharma — Fri, 20 Aug 2010 10:18:01 +0000

Hi,

Currently I am using WP 3.0 Multisite but I plan to use WP Hive to create a network of sites with domain, sub-domain & sub-directory installs.

Will this plugin work or some mods will be required.?

By: Ron

Ron — Tue, 10 Aug 2010 03:44:06 +0000

Yes, the WPMU constant is not needed with the latest version.

By: Ron

Ron — Tue, 10 Aug 2010 03:43:30 +0000

The home database support does not work with a WP 3.0 -> WP network.

By: beachbum

beachbum — Mon, 09 Aug 2010 16:41:53 +0000

I also noticed this and it didnt make any sense.

I assumed that the main database defined in wp-config would be the master database, then the main site(blog1) would be a separate database called home, and any vip databases would also be separate with the vip prefix.

Seeing that it made each site a separate database I commented out the blog1-home entry and added all sites that should share a database.(kinda backwords)

So now I have what I thought this would do, giving each vip site(a site not defined in the vip section) and home its own database(prefix_xx), and all the rest are prefix_home.

I havent had a chance to delete some of the tables in the master database as defined in wp-config so see what effect this has but Im guessing that this database is no longer used.

Also, I have define(‘WPMU’, ’1′); and define(‘WPMU’, ’true′); in my wp-config. These are obsolete now?