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Wide Covering Indexes: The Cost of INCLUDE Everything

September 7, 2018
Pinal Dave
SQL Performance
Best Practices, SQL Performance, SQL Server

Adding every column with INCLUDE feels like a free speed-up. Here is a small demo of the space, reads and writes you pay for.

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A to Z alphabet smiley faces.

Alphabets – SQL SERVER – Retrieving Rows With All Alphabets From Alphanumeric Data

September 4, 2018
Pinal Dave
SQL Tips and Tricks
SQL Function, SQL Scripts, SQL Server, SQL String

I got an email from one of my blog readers asking for an easy way to identify if a given string contains only alphabets. There can be methods.

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SQL SERVER – Applying NOLOCK to Every Single Table in Select Statement – SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED

September 3, 2018
Pinal Dave
SQL Performance
Query Hint, SQL Scripts, SQL Server, Transaction Isolation

READ UNCOMMITTED changes session read isolation without adding NOLOCK to every table. A workshop procedure made the distinction useful.

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How to Move SQL Server MDF and LDF Files? – Interview Question of the Week #189

September 2, 2018
Pinal Dave
SQL Interview Questions and Answers
File format, SQL Scripts, SQL Server

How do you move SQL Server MDF and LDF files? Detach and attach is the old way, so here is the step-by-step method I use for my clients today.

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User defined function to extract only numbers from string.

SQL SERVER – UDF – User Defined Function to Extract Only Numbers From String – Number Table Method

August 30, 2018
Pinal Dave
SQL Tips and Tricks
SQL Function, SQL Scripts, SQL Server

I rewrote my User Defined Function to extract only numbers from a string. The new one uses a numbers table, also called a Tally table, instead of a WHILE loop.

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Database CheckCompletion error.

SQL SERVER – Unable to Attach Database Files – The PageAudit Property is Incorrect – Ransomware Attack

August 29, 2018
Pinal Dave
SQL Tips and Tricks
SQL Audit, SQL Error Messages, SQL Log, SQL Scripts, SQL Server, SQL Server Security

After a ransomware attack, a client could not attach database files and saw: The PageAudit property is incorrect. Here is what the error means.

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Wood shavings are inspected beside the joinery work that produced them.

SQL SERVER- High CPU and Transaction Type WorkFileGroup_fake_worktable and Workfile

August 28, 2018
Pinal Dave
SQL Performance
SQL Error Messages, SQL Operator, SQL Performance, SQL Scripts, SQL Server, SQL TempDB

Workfile and WorkFileGroup_fake_worktable were clues in a customer high-CPU investigation. I correlated them with queries and plan evidence.

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