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Diagram of the Resource Governor flow using the names from the example: requests go to the classification function dbo.UDFClassifier, which routes them to ReportServerGroup, PrimaryServerGroup or the default group, and each group uses its own resource pool; the report pool is limited to 30 percent of CPU and memory

Resource Governor Workload Groups and Pools: A Simple Setup Example

June 4, 2012
Pinal Dave
SQL Tips and Tricks
Resource Governor, SQL Performance, SQL Scripts, SQL Server

Resource Governor workload groups let you limit CPU and memory for competing workloads. This introduction answers what Resource Governor is and why you need it, then shows a full T-SQL setup example.

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A parcel sorting table where one wrapped package has been set down in the wrong chute mouth.

SQL SERVER – Fix: Error 147 An aggregate may not appear in the WHERE clause

June 3, 2012
Pinal Dave
SQL Tips and Tricks
SQL Error Messages, SQL Scripts, SQL Server

Error 147: An aggregate may not appear in the WHERE clause. A beginner was stuck on it for a long time, so here is the simple fix, explained for beginners.

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Sequence values displayed in SQL Server Management Studio.

SQL SERVER – A Puzzle Part 4 – Fun with SEQUENCE in SQL Server 2012 – Guess the Next Value

June 2, 2012
Pinal Dave
SQL Puzzle

Part 4 of my SEQUENCE puzzles uses a DECIMAL sequence that counts down by 1 and cycles. Can you guess the next value SQL Server 2012 returns?

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Gouache painting of an empty wooden stool at a workbench at dawn, with a folded letter sealed in vermilion wax resting beside a well worn tool left for a newcomer

A Letter to the Developer Starting Out

June 1, 2012
Pinal Dave
Personal
Best Practices, Career Advice, SQL Training

A letter to every developer starting out: it’s fine not to know, your hands learn slower than your head, choose people over perks, keep your promises and keep learning. One day you will be the one standing beside the bench.

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Gouache painting of a workshop pegboard holding many different tools in neat outlines, a hand plane, a magnifying glass, a small blank chalkboard, a ruler and a sketchbook, with one vermilion mallet standing out

Every Way to Learn, and Which One Fits You

May 31, 2012
Pinal Dave
Personal
Best Practices, Career Advice, SQL Training

There is no single best way to learn a technical craft. Courses, books, reading code, pairing, building, teaching and AI tutors each do one job well. Here is every way to learn, what each is good for and how to choose the one that fits you.

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A pepper mill holds peppercorns above its mechanism with an unsuitable pebble caught before grinding

Second-Order SQL Injection: When Stored Data Becomes Code

May 30, 2012
Pinal Dave
SQL Tips and Tricks
Dynamic SQL, SQL Server Security, SQL String, SQL Variable

A safe insert does not make the saved value safe forever. Here is how stored text turns into code later, and the plain fix.

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Gouache painting of two chisels on a workbench, one old with a worn handle and one brand new, tied together with a single vermilion ribbon under a warm work lamp

Employee Training Is a Promise Both Sides Keep

May 29, 2012
Pinal Dave
Personal
Best Practices, Career Advice, SQL Training

Employee training is a promise with two sides. The employer promises time, guidance and room to grow. The developer promises attention, effort and honesty, even on the way out. Here is what each side owes, and why keeping it matters.

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