Keywords: SQL Server | License Management | SERVERPROPERTY Function
Abstract: This article provides an in-depth exploration of various methods to determine the license type of SQL Server after installation, primarily based on the SERVERPROPERTY function, covering differences from SQL Server 2000 to modern versions, and supplementing with techniques like PowerShell, registry queries, and error logs. Through step-by-step analysis and code examples, it helps administrators manage license compliance effectively.
In SQL Server database management, license management is a critical aspect, especially in post-installation phases, where determining the applied license type is essential for compliance and reporting. Based on technical Q&A data, this article distills core knowledge and reorganizes logical structures to offer a comprehensive guide.
Introduction: Importance of License Identification
SQL Server license models vary, including types like Server/Client Access License (Server/Cal) and PerCore. After installation, administrators may need to verify license details, such as in upgrade, audit, or migration scenarios. The reference article mentions cases where users cannot identify the license type due to confusion with installation files, highlighting the value of automated query methods.
Core Method: Using the SERVERPROPERTY Function
For SQL Server instances, the most direct approach is using T-SQL queries with the SERVERPROPERTY function. This applies to multiple versions, but specific parameters vary. The primary query is as follows:
SELECT SERVERPROPERTY('LicenseType') AS LicenseType, SERVERPROPERTY('NumLicenses') AS NumLicenses
This code returns the license type and number of licenses, typically used for SQL Server 2000 and earlier. In SQL Server 2005 and later, the LicenseType and NumLicenses parameters may be deprecated or changed, necessitating version-specific methods.
Version Differences and Supplementary Techniques
Depending on the SQL Server version, query methods differ. For SQL Server 2005 to 2008 R2, SERVERPROPERTY('LicenseType') and SERVERPROPERTY('NumLicenses') may no longer be applicable. Alternative methods include using PowerShell scripts or querying the registry.
PowerShell example: Retrieve product keys or registry paths via scripts, but handle permissions with care. For instance, reference external resources like Ryadel's guide.
For SQL Server 2012 and later, license information can be extracted from error logs. Use the stored procedure:
EXEC sp_readerrorlog @p1 = 0, @p2 = 1, @p3 = N'licensing'
This returns log entries containing license details, though the format may not be uniform, providing additional descriptive information.
Comprehensive Queries and Best Practices
Combining other answers, more comprehensive queries can be executed to obtain version and license information. For example:
SELECT SERVERPROPERTY('productversion') AS ProductVersion, SERVERPROPERTY('productlevel') AS ProductLevel, SERVERPROPERTY('edition') AS Edition, @@VERSION AS SQLVersion
This helps identify editions like Evaluation or Standard. In practice, it is recommended to first use SERVERPROPERTY('LicenseType') and SERVERPROPERTY('NumLicenses') for a quick check, and if they return null or errors, switch to version-specific methods.
Conclusion: Automation and Compliance
Determining SQL Server license types should combine automated queries and manual verification. The core method is using the SERVERPROPERTY function, but version compatibility must be considered. For modern SQL Server, error log queries provide supplementary data. Through the methods outlined in this article, administrators can efficiently manage licenses, ensuring compliance and optimizing resource usage.