Top Posts Tagged with #database mirroring

Feature Request - Expand MSX/TSX Capabilities for HADR

[New #Blog Post] Feature Request to Expand #SQLServer MSX/TSX Capabilities for #HADR

Following my presentation of “How to HADR Your SQL Server Jobs” at the HA/DR PASS Virtual Group yesterday, David Klee (@kleegeek) and I continued chatting for a bit longer after the recording was concluded. During which, the MSX/TSX feature of SQL Server came up, and David suggested that I’d utilize my newly earned MVP status to push a feature request to expand these capabilities.

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#automation #availability groups #database mirroring #HADR #Jobs #Mirroring

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Control SQL Jobs based on HADR Role - Taking it to the Next Level

[New #Blog Post] Bam! Let's knock it up a notch! Enable or Disable #SQLServer Jobs Based on HADR Role - Taking it to the Next Level! #Microsoft @SQLServer #MadeiraData

In one of my previous blog posts, Automatically Enable or Disable Jobs based on HADR Role, I provided a solution for automatically enabling or disabling scheduled jobs in combination with Availability Groups and Database Mirroring. In this blog post, I’m going to build upon my previous solution and improve it even further – taking it to the next level of automation!

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#AlwaysOn #availability groups #database mirroring #failover #job #Jobs #Mirroring #script

Database mirroring is one type of relational database management system (RDMS) method to keep up critical information in spite of high accessibility needs by making excess copies of a dataset.

#database mirroring #database #sql #sql server

Deprecating Database Mirroring in SQL Server

Database Mirroring was Initially implemented in Microsoft SQL Server 2005 as a go-to feature for many database professionals. Database administrators like using this feature to ensure their databases could be redundant and offer high availability. This particular attributes is desirable in an environment where five nines(99.999% uptime) is critical. Businesses need access to data around the…

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#99.999 #Always On Availability Group #Database Mirroring #Disaster Recovery Planning #sql server

Post has been published on Varinder Sandhu 's Blog

Post has been published on http://www.varindersandhu.in/2014/07/29/sql-server-database-mirroring-vs-log-shipping/

SQL Server – Database mirroring vs Log Shipping

I would like to start this topic with very common question for database administrators.

Question: What is difference between the Database Mirroring and Log Shipping? Which is preferable solution?

Database Mirroring:

Database mirroring is functionality in the SQL Server engine that reads from the transaction log and copies transactions from the principal server instance to the mirror server instance. Database mirroring can operate synchronously or asynchronously. Database mirroring supports only one mirror for each principal database. Database mirroring also supports automatic failover if the principal database becomes unavailable. The mirror database is always offline in a recovering state, but you can create snapshots of the mirror database to provide read access for reporting purposes etc.

Log Shipping

Log shipping is based on SQL Server Agent jobs that periodically take log backups of the primary database, copy the backup files to one or more secondary server instances, and restore the backups into the secondary database(s). Log shipping supports an unlimited number of secondaries for each primary database.

I personally don’t think that anyone is preferable over another one because both have their pros and cons. All I can say it’s all depend upon your requirements. More information about both technologies is available in SQL Server – Book Online.

#Database Mirroring #Log shipping #SQL Server

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Post has been published on Varinder Sandhu 's Blog

Post has been published on http://www.varindersandhu.in/2014/05/20/sql-server-database-mirroring-disaster-recovery-solution/

SQL Server - Database Mirroring for Disaster-Recovery Solution

What is Database Mirroring?

Database mirroring is a solution for increasing the availability of a SQL Server database. But it has been gained popularity as a disaster-recovery option.

How Database Mirroring Working.

The principle server sends the active transaction log record to the mirrored server. The mirrored server applies the transaction log record one by one in sequence.

Prerequisites

The two partners, that is the principal server and mirror server, must be running the same edition of SQL Server.

The database must use the full recovery model. The simple and bulk-logged recovery models do not support database mirroring. Therefore, bulk operations are always fully logged for a mirrored database.

When you are creating the mirror database on the mirror server, make sure that you restore the backup of the principal database specifying the same database name WITH NORECOVERY.

We cannot mirror the master, msdb, tempdb, or model databases. Only user databases can be mirrored.

A mirrored database cannot be renamed during a database mirroring session.

Database mirroring does not support FILESTREAM feature.

Database mirroring can support a maximum of about 10 databases per server instance on a 32-bit system.

Cross-database transactions or distributed transactions in not supported in Database mirroring.

Restrictions

We cannot mirror the master, msdb, tempdb, or model databases. Only user databases can be mirrored.

A mirrored database cannot be renamed during a database mirroring session.

Database mirroring does not support FILESTREAM feature.

Database mirroring can support a maximum of about 10 databases per server instance on a 32-bit system.

Cross-database transactions or distributed transactions in not supported in Database mirroring.

Here we will give you demo – How to Setup the database Mirroring.

Go to database Properties >> Navigate to Configure Security

SQL Server – Database Mirroring for Disaster-Recovery Solution

Click Next

SQL Server – Database Mirroring for Disaster-Recovery Solution

For the demonstration purpose, we are not going to configure the witness server that is used in synchronous mode with automatic failover.

SQL Server – Database Mirroring for Disaster-Recovery Solution

Here we have selected the Principal Server where originally database located.

SQL Server – Database Mirroring for Disaster-Recovery Solution

Here we selected the Mirror instance where mirror copy will be located.

SQL Server – Database Mirroring for Disaster-Recovery Solution

Here we mentioned the service account of principal and Mirror server Instance.

SQL Server – Database Mirroring for Disaster-Recovery Solution

Successfully configure the endpoints.

SQL Server – Database Mirroring for Disaster-Recovery Solution

Once, you click the close button, dialog box prompt you to start the Database Mirroring. We have to not started the Database mirroring and close that dialog box. Because we would like to change the operating mode to High performance (asynchronous). Must refer Book Online for study about the “Operating Mode”. Before starting the mirroring make sure that you restore the backup of the principal database specifying the same database name WITH NORECOVERY.

SQL Server – Database Mirroring for Disaster-Recovery Solution

Once you start mirroring. You principal database looks as shown in below snapshot:

SQL Server – Database Mirroring for Disaster-Recovery Solution

You Mirror database looks as shown in below snapshot:

SQL Server – Database Mirroring for Disaster-Recovery Solution

For Database Mirroring Administration click here

#Database Mirroring #Disaster Recovery #SQL Server