Justin Cooney

Web Development Tips and Examples

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about

I am a Senior Applications Programmer / Analyst with years of experience developing enterprise solutions using the Microsoft technology stack including C#, VB.NET, ASP.NET, AJAX, IIS and SQL Server. I specialize in Web application development with a focus on building secure systems, integrating applications, and designing robust database structures.

Category: SQL

  • SQL Server: Global Temporary Tables

    Global Temporary tables are defined on creation by adding the double pound sign (##) as a prefix. Unlike temporary tables they are available to all SQL Server sessions until the table is destroyed/the creating session goes out of scope. Global Temporary tables are similar to regular temporary tables in that they exist in tempdb and…

  • SQL Server: When to Use the TSQL WITH NOLOCK Hint

    MS SQL Server allows using the TSQL hint ‘WITH (NOLOCK)’ to the joins of SELECT statements. At times the WITH (NOLOCK) hint can be justified and useful, but it comes with inherent dangers that are often ignored or not understood. The WITH (NOLOCK) hint is often overused or is used when it should not be.…

  • MS SQL Server: Temporary Table and Table Variable Performance

    Temporary tables and table variables in SQL Server actually perform quite differently under different circumstances. Temporary tables are decelared as: CREATE Table #TableName ( id INT ) Table variables are declared as: DECLARE @TableName TABLE ( id INT ) Temporary tables are transaction bound whereas table variables are not. This means that if a transaction in…