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What is split brain scenario in DB mirroring?
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Answer / k v n subba reddy
In high availablity mirroring if the connection between
witness server and primary server is break off but if
primary server is still up. The witness server will up
mirror server. In this scenario both primary server and
mirror server is up and this scenario is called as SPLITBRAIN.
Question1 : In this case the users are connected to primary?
or mirror server?
Question2 : Once the connection between witness server and
primary server break even primary server is up , are users
connected to primery server or secondary server?
Your users will be connected to whichever server they are
configured to access. If they have (for example) the
"Failover Partner =" part in their connection strings, then
if they have lost connection to the principal, they will try
to connect to the mirror.
It kind of depends on the nature of the loss in connection
between the principal, mirror and witness. If the primary is
up on Site A, but the link is down between it and the mirror
(and witness) on Site B, hence causing the scenario you have
described, but the users are also at Site A, then they will
still be on the principal.
If the users are at Site C, and there is no break in the
link between C->A or C->B, they will probably still be
connected to the principal.
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