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On Thu, Oct 16, 2008 at 10:06:20AM +0100, Marcus Bointon wrote:
> On 16 Oct 2008, at 09:46, Simon J Mudd wrote:
> >If they are on 2 instances then they are not on the same slave, so the
> >answer is definitely no.
> Not true. Simply run the two instances on different ports and
> different config files.
Then you are not replicating from 2 separate masters into the same
instance which is what the questioner was asking.
MySQL allows you to do:
/--------> slave 1
master ------------> slave 2
\--------> slave 3
Whether these slaves are located on the same server or not is irrelevant.
What it doesn't allow you to do is:
master 1 --\
master 2 ------> common slave instance
master 3 --/
Thus the "common slave instance" acts as a central server containing all
the data from the 3 masters shown in the example. To do this requires
careful configuration to ensure you avoid duplicate rows but can be done,
but not AFAIK in MySQL.