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The Locks, Blocks, and Deadlocks of SQL Server: Unraveling the Knots

September 27, 2023
Pinal Dave
SQL Tips and Tricks
Deadlock, Idera, SQL Lock

SQL Server is no exception. However, it often leads to three common phenomena – locks, blocks, and deadlocks. SQL Diagnostic Manager SQL Server

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CHARINDEX

SQL SERVER – A Comparison of CHARINDEX vs LIKE

September 26, 2023
Pinal Dave
SQL Performance
SQL Function, SQL Performance, SQL String

In this post, we’ll explore a comparison between the use of CHARINDEX and LIKE in the WHERE clause, supported by real-world statistics.

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A large and a small copy of the same book on a library shelf, a hand sliding the small one back out.

Case-Insensitive Unique Constraints in a Case-Sensitive Database

September 25, 2023
Pinal Dave
SQL Tips and Tricks
Computed Column, SQL Collation, SQL Constraint and Keys, SQL Index, SQL Server

Enforce case-insensitive unique user names in a case-sensitive database using an indexed computed column with an explicit collation.

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Modern Explicit JOIN.

SQL SERVER – Modern Explicit JOIN Syntax – A Brief Note

September 22, 2023
Pinal Dave
SQL Tips and Tricks
SQL Joins

Over time, SQL has evolved and offers two distinct styles for performing JOIN operations: the old-style comma-separated join and the more modern explicit JOIN syntax.

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htmltags

SQL SERVER – Stripping HTML Tags from Text

September 21, 2023
Pinal Dave
SQL Tips and Tricks
HTML, SQL Function

In this blog post, we’ll explore a method for stripping these HTML tags from your text data using SQL Server. Let us explore the post.

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Gouache painting: a pantry shelf with three neat, well-filled jars of pickled gherkins on the left and six cluttered, overfilled jars on the right; one jar lid is vermilion

Gherkin Scenarios: 3 Examples to Follow and 6 to Avoid

September 20, 2023
Pinal Dave
Personal
Developer, Software Development, Testing

Write Gherkin scenarios that specify behavior clearly. Compare three examples to follow with six to avoid, and make outcomes testable.

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Incremental Statistics

SQL SERVER – Understanding Incremental Statistics

September 19, 2023
Pinal Dave
SQL Performance
SQL Index, SQL Statistics

Understanding incremental statistics: since SQL Server 2014, statistics can update only the changed subsets instead of a costly full scan on large tables.

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A huge roasting tray in an open oven holding one small sausage in the middle.

Oversized varchar Columns and Inflated Memory Grants

September 18, 2023
Pinal Dave
SQL Performance
Execution Plan, SQL Datatype, SQL Memory, SQL Performance, SQL Server

Investigate oversized varchar declarations, compare sort memory grants, and narrow string columns safely without losing valid data.

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A tennis ball machine sending every ball to the same spot on a clay court, the marks clustered in one place.

Repeatable Test Data With a Fixed Random Seed

September 15, 2023
Pinal Dave
SQL Tips and Tricks
SQL Function, SQL Random, SQL Server, Testing

Generate repeatable test data with a fixed RAND seed or row-number hashes, then verify identical names and amounts across runs.

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Query Store Feature for Secondary Replicas.

SQL SERVER – Query Store Feature for Secondary Replicas

September 14, 2023
Pinal Dave
SQL Tips and Tricks
AlwaysOn, Query Store, SQL Server 2022

SQL Server 2022 extends the Query Store feature for secondary replicas. Here is how to enable it and what to watch before using it.

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