[wp-hackers] Multiple Sites - One Session

Bjorn Wijers burobjorn at gmail.com
Fri Jun 10 15:30:37 UTC 2011

I agree with Jeremy. You always can have the option to shard databases
or even implement your own database layer. An example of this would be


On 06/10/2011 03:41 PM, Jeremy Clarke wrote:
> On Thu, Jun 9, 2011 at 3:40 PM, Baki Goxhaj <banago at gmail.com> wrote:
>> Well, different databases basically.
> In my experience it's not worth having multiple installs just to keep the
> databases seperate. From a performance perspective all my bottlenecks have
> been in the posts and taxonomy tables, and those are not shared within a
> multisite install. MySQL chokes badly if you give any one *table* too much
> traffic, but as far as I can tell it doesn't matter if two tables are in the
> same 'database' or just on the same database server, they will have the same
> amount of autonomy and will fail the same way when one of those sites
> develops a large set of posts and runs complex queries on them.
> If everything else about your site plan makes sense with Multisite (i.e. if
> the plugins and themes can be shared by all sites in the network, if the
> sites are all related enough in terms of their owners/operators that it
> makes sense for them to live in the same spot) then you should try
> implementing it that way, you lose a lot of benefits when you have multiple
> sites instead of multisite, and merging sites together can be a daunting
> task if you already have a lot of content and users in the split-up sites.
> If you end up needing to optimize the database setup there are any number of
> ways you can go about it, but if you want single-sign-on across sites then
> your solution will have to involve all these sites living on the same MySQL
> install, so the difference in optimization simplicity is pretty small
> between Multisite and multiple installs.
> Jeremy Clarke • jeremyclarke.org
> Code & Design • globalvoicesonline.org
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