When to use database mirroring in an upgrade?

When to use database mirroring in an upgrade?

Database mirroring is supported as an upgrade/migration method if the principal instance is running SQL Server 2008 SP3 or later, SQL Server 2008 R2 SP2 or later, SQL Server 2012 SP1 or later, or SQL Server 2014, and the secondary instance is running SQL Server 2016 or SQL Server 2017.

Which is the best way to migrate SQL Server?

The Side by Side migration / upgrade method is the preferred method to migrate to a new server and/or upgrade your version of SQL Server. This method involves configuring a new database server which will run in unison with the current running SQL Server source.

How does rolling upgrade work in SQL Server?

A rolling upgrade is a multi-stage process that in its simplest form involves upgrading the SQL Server instance that is currently acting as the mirror server in a mirroring session, then manually failing over the mirrored database, upgrading the former principal SQL Server instance, and resuming mirroring.

How to set up a mirror server in SQL Server?

Establishing a new mirroring session requires that the server instances all be running the same version of SQL Server. After you fail over, we recommend that you run the DBCC CHECKDB command on the principal database. Upgrade each server instance that is now the mirror server in all mirroring sessions in which it is a partner.

How to upgrade a server in a mirrored session?

If all your server instances are currently the principal server in any mirroring sessions, select one server instance to upgrade first. Then, manually fail over each of its principal databases and upgrade that server instance. After being upgraded, a server instance automatically rejoins each of its mirroring sessions.

Do you have to upgrade all mirrored instances?

Upgrade each server instance that is now the mirror server in all mirroring sessions in which it is a partner. You might have to update multiple servers at this point. In a complex mirroring configuration, some server instance might still be the original principal server in one or more mirroring sessions.

When was database mirroring deprecated in SQL Server?

Database mirroring was deprecated in SQL Server 2012, but it still works just fine in SQL Server 2016 and in SQL Server 2017.

Do you have to run the same SQL Server as the mirror server?

The mirror server instance must be running the same edition of SQL Server. A database mirroring session runs with either synchronous or asynchronous operation. Under asynchronous operation, the transactions commit without waiting for the mirror server to write the log to disk, which maximizes performance.

Do you need a sysadmin to migrate SQL Server?

Downtime when migrating a cluster that uses strictly Availability Groups (with or without SQL FCIs) can be greatly limited by using Distributed Availability Groups, but this does require that all instances run SQL Server 2016 (13.x) RTM (or above) versions. All migration strategies require SQL Server sysadmin role.

How to upgrade to SQL Server 2008 R2 standard edition?

Your next step would be to failover all of the mirrored user databases from the original Principal instance (which is still running on SQL Server 2008 R2 Standard Edition) to this newly upgraded instance. After that, you would repeat the Edition Upgrade process on the other instance, with the same steps and results.

Who is the principal server in database mirroring?

In database mirroring, the partner whose database is currently the principal database. Received transaction log records that are waiting on the disk of a mirror server. The principal server and mirror server perform complementary principal and mirror roles. Optionally, the role of witness is performed by a third server instance.

How does role switching work in database mirroring?

Within the context of a database mirroring session, the principal and mirror roles are typically interchangeable in a process known as role switching. Role switching involves transferring the principal role to the mirror server.

How to configure SQL Server database mirroring using SSMS?

Now it’s time to dig down and configure Database Mirroring. From the Principal server, right click the database and choose “Tasks” | “Mirror” or choose “Properties” | “Mirroring”. Click the “Configure Security” button and click “Next >” if the Configure Database Mirroring Security Wizard intro screen appears.

How does Database mirroring witness work in SQL Server?

Throughout a database mirroring session, all the server instances monitor their connection status. If the partners become disconnected from each other, they rely on the witness to make sure that only one of them is currently serving the database.

What’s the easiest way to migrate from one SQL Server to another?

Another relatively quick and easy way to do a Production migration of data from one place to another or from an older version of SQL Server to a newer version of SQL Server is to use database mirroring.

How long does it take to fail over a mirrored database?

Synchronous database mirroring lets you run a simple command to fail over each mirrored user database from the principal instance to the mirror instance (as long as each database is in a synchronized state). This fail over typically takes about 5-10 seconds.