Instances in SQL Server

ByDr. SubraMANI Paramasivam

Instances in SQL Server

Instance is nothing but SQL Server Installation. In SQL Server 7.0 only one installation was allowed and this changed from 2000 Version onwards. Default instance is nothing but connecting to SQL Server using the computer name. Where as the named instance such as Mani will have computername\mani. For example if the computer name is MyServer, then the named instance would be MyServer\Mani. Now I can install many number of named instances and the maximum is based on the edition that you use. The list is provided below for each edition.

The port used by default instance is always 1433 and named instances use dynamic allocation.

The total number of instances including the default instance of SQL Server supported by all editions differ. The following gives a clear idea of the supported instances for each editions.

Enterprise – 50

Developer – 50

Standard – 50

Workgroup – 16

Express – 16

Note: Windows Failover Cluster supports only 25 instances.

About the Author

Dr. SubraMANI Paramasivam administrator

Dr.SubraMANI Paramasivam is a Data Platform MVP, Power BI Group Leader, International Speaker, Microsoft Certified Trainer and Principal Solutions Architect at DAGEOP Ltd, having 20+ years of DB, BI & Analytics experience. Dr.SubraMANI Paramasivam is a frequent speaker in SQLBITS, PASS Summit, PASS SQL Saturdays, SQLRelay, Data Platform Summit, MCT Summit, SQLServerGeeks Summit, INSIDESQL UK, Data Awareness Programmes, Data Day Events. He likes to enlighten the education & data and started his own journey with FREE Data Awareness Programme (, in remote areas who are in need. Mani speaks a lot about Visualization, Data Science, R Analytics, Azure concepts, Performance Tuning, DB & SQL Server Architecture, DBA, Partitioning, Resource Governor, Disaster Recovery, High Availability, Development, T-SQL Programming and Microsoft certifications.

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