[HyperDB] Question

Callum Macdonald lists.automattic.com at callum-macdonald.com
Mon Nov 7 10:19:24 UTC 2016

The number 1 rule of scalability is...

don't fix problems you don't have

My advice would be to run your blog system on a single database, and
deal with separating it into multiple databases only if and when you
actually have a performance problem. You might find that many other
things are bigger issues along the way first.

Cheers - Callum.

On Mon, 7 Nov 2016, at 07:15 AM, Ariful Islam wrote:
> Thank you for your replay... I don't have much knowledge about
> replication...
> I have to learn it then i can apply...  I am a student... I am still
> learning about wordpress... I am opening a website where we will open
> blog
> for my friends and classmate... we will have lot of blogs so I need to
> separate them in multiple database.. i will create the database
> manually..
> suppose i'll store 300 blogs for each database... my current database
> will
> keep getting new registration when it reach 300 blogs will move them in
> new
> database... when my current database get another 300 blogs ill move them
> another database... can i add one by one..? i mean when I need will add
> them and configure theme in db-config.php do you have any tutorial about
> it
> or any code suggestion..? can you suggest me how can i write the callback
> function that will determine which blog is in which database...!! Thanks
> On Thu, Nov 3, 2016 at 11:11 PM, Brian Layman <hyperdb at thecodecave.com>
> wrote:
> > On 11/3/2016 9:29 AM, Ariful Islam wrote:
> >
> >> I don't fine any tutorial about this plugin...
> >> I want to create many databases and balance the load how can i do it with
> >> hyperdb
> >>
> > Wow... I haven't seen a message come across this message board for a long
> > time. I had to re-configure my mail client so that I could reply!
> >
> > HyperDB will do what you want.  You must configure MySQL to handle the
> > replication, but HyperDB will allow your WordPress install to access
> > multiple databases.
> >
> > Here are to relatively recent tutorials to guide you through this process:
> > 1. https://torbjornzetterlund.com/how-to-setup-a-mysql-replicat
> > ion-database-for-wordpress/
> > 2. http://net-load.com/how-to-setup-mysql-database-master-and-
> > slave-with-hyperdb-on-wordpress/
> >
> > Both of those articles, at a glance, seem to be fairly accurate and they
> > should do what you need.
> >
> > Here are some of my own tips for you:
> > 1. Only do this when it is proven that you need to do this. Don't
> > complicate your set up if you don't absolutely have proof that you have to.
> > 2. Before you switch to HyperDB, make certain that you have eliminated any
> > extra DB writes in your code. If you are writing to the database when you
> > don't need to be, eliminating that may solve all of your database headaches.
> > 3. Make certain that once replication is configured, that all of your
> > slave database are receiving changes in a timely fashion.  One of the worst
> > things to debug is why some visitors to your site get one set of data and
> > others get another.
> > 4. If you also have multiple webheads, use a caching solution for page
> > caching and micro-caching that is accessible to all of your servers.  Allow
> > the work on one server to be a benefit of all of your servers.
> > 5. Also if you have multiple webheads, beware of the use of state
> > conditions like sessions and transients that if not implemented correctly
> > could exist on one server, but not be carried over to others.
> >
> > That's my advice of the morning.  Hope that helps!
> > Brian Layman
> > eHermit
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