SQL-Advanced | Varinder Sandhu

SQL Server – Single Instance vs. Multiple Instances

Varinder Sandhu — Fri, 24 Jul 2015 12:14:00 +0000

Single Instance Pros Only one instance needs to be administered on the single machine. There is no duplication of components or processing overhead, such as having to run multiple database engines on the same computer. This means that the overall performance of a server with a single instance may be

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Effective Database Maintenance and Management – Index Fragmentation

Varinder Sandhu — Fri, 23 Jan 2015 13:14:10 +0000

We have said before that indexes are easily the most important database structures insofar as database performance tuning is concerned. Therefore, you must pay keen attention to their configuration, structure and arrangement in order to get the best level of performance out of them. Theory of index fragmentation Fragmentation does

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Unable to connect the SQL Server Instance – 26 – Error Locating Server/Instance Specified

Varinder Sandhu — Fri, 21 Nov 2014 10:16:00 +0000

Problem\Issue: User is not able to connect the SQL Server Named Instance ServerName\InstanceName Additional Error Messages: A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is

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SQL Server – How to read the SQL Server Error log files using TSQL

Varinder Sandhu — Tue, 11 Nov 2014 10:04:51 +0000

There is undocumented system stored procedure sp_readerrorlog which allows us to read the SQL Server error log files directly using T-SQL. This procedure has total 7 parameters as given below: Parameter Values First Parameter Value of error log file you want to read: 0 = current, 1 = Archive #1,

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SQL Server – Enable SQL Server 2012 AlwaysOn Availability Groups

Varinder Sandhu — Mon, 11 Aug 2014 07:00:54 +0000

In the previous post SQL Server – AlwaysOn Availability Groups, described enhancement to SQL Server 2014 AlwaysOn Availability Groups. In this post, we will see how to enable SQL Server 2012 AlwaysOn Availability Groups using UI and PowerShell. Using UI Go to SQL Server Configuration Manager >> Navigate to SQL

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SQL Server – Database mirroring vs Log Shipping

Varinder Sandhu — Tue, 29 Jul 2014 13:24:35 +0000

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

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SQL Server – Log shipping for Disaster Recovery Solution

Varinder Sandhu — Thu, 17 Jul 2014 05:35:06 +0000

What is Log Shipping? Log Shipping is a basic level SQL Server high-availability technology. It is automated process to send the transaction log backups from a primary database on a primary server instance to one or more secondary databases on separate secondary server instances. The transaction log backups are applied

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SQL Server – Unattended Installation of SQL Server 2012 Using Command Line

Varinder Sandhu — Mon, 30 Jun 2014 12:45:01 +0000

Many times we face a requirement to perform the unattended installation of SQL Server. In this post we will see the steps to perform the unattended installation of SQL Server 2012 using command line. There are two ways to install the unattended installation of SQL Server 2012 using command line.

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SQL Server – AlwaysOn Availability Groups

Varinder Sandhu — Tue, 27 May 2014 10:57:46 +0000

Introduction Microsoft introduced the AlwaysOn Availability Groups which is a high-availability and disaster-recovery solution that provides an enterprise-level solution in SQL Server 2012. Using Database Mirroring for local high availability and combining it with Log Shipping for a disaster recovery solution is popular deployment architecture prior to SQL Server 2012.

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SQL Server – How to restore the mirroring database

Varinder Sandhu — Wed, 21 May 2014 11:30:56 +0000

Now here we have question regarding the Mirroring Database: How can we recover the data from mirror database? How to restore the mirroring database? Here I would like to clear that we cannot restore a database that is involved in Mirroring without removing Mirroring. Removing the Mirroring using T-SQL ALTER

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