Category: TSQL and SQL Client Code

Single-Row Deadlock

Introduction Demonstration of the smallest possible deadlock: only one statement, one table, one row. Without transactions (no BEGIN TRANSACTION). Even RCSI (Read Committed Snapshot Isolation) is turned ON to eliminate shared locks. Everything is “by the book” as Books Online

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Query with optional filters (catch-all query)

In almost every database we have a process that filters the same data with different filters. Typically, query is within a stored procedure that has many filtering parameters that are optional. The problem is – a query optimized builds only ONE plan that will handle every filter combination you throw at it.

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Formatting TSQL code

How do I format my TSQL code? Everybody has it’s own preferences on formatting SQL or TSQL code. I follow few very simple rules to achieve better readability, less bugs and  – you wont’ believe – faster code execution! Code

CommandTimeout – How to handle it properly – code example

Properly closing a connection to Sql Server in DotNet is more challenging than one might think. Classic code looks something like this MSDN example:

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CommandTimeout – How to handle it properly?

ADO.Net Data Provider for SQL Server (System.Data.SqlClient namespace in System.Data.dll assembly) has two common classes we often use: SqlConnection and SqlCommand. SqlCommand class has CommandTimeout property (do not mix it with the ConnectionTimeout which stops long login process). But, do

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