SQL Server - usage of the WITNESS instance in SQL Server 2005 Database
Mirroring - Feb 27, 2010 at 11:50 AM by Shuchi Gauri
What is the usage of the WITNESS instance in SQL Server 2005 Database
Mirroring?
A WITNESS instance is very important for optimum and high availability database
mirroring. In a default scenario, automatic failover is desired, thus, database
mirroring must be configured with high safety mode. This needs a WITNESS server
to be running on a third server. It enables the mirror SQL Server to recognize
whether to initiate an automatic failover or not. It does not serve the
databases being mirrored; rather its only purpose is to monitor the production
and mirrored servers. Without WITNESS server in place, an automatic failover
cannot happen and this failover is taken care of manually.
SQL Server - usage of the WITNESS instance in SQL Server 2005 Database
Mirroring - May 05, 2009 at 22:00 PM by Rajmeet Ghai
What is the usage of the WITNESS instance in SQL Server 2005 Database
Mirroring?
The WITNESS server is used to enable the mirror server to recognize the
necessity of failover. In the absence of WITNESS server, the failover is done
manually. It is simply used to monitor the production and mirrored instances
for a failover. It is not used for databases being mirrored.
SQL Server - usage of the WITNESS instance in SQL Server 2005 Database
Mirroring - June 21, 2009 at 09:00 AM by Amit Satpute
The witness server can run on any hardware that will run SQL Server 2005,
including SQL Server 2005 Express Edition.
A witness instance is very important for optimum high availability using
database mirroring.
The purpose of the witness instance is to monitor the production and mirrored
instances and decide initialization of a failover.
If a witness instance is not used, failover must be implemented manually.
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