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Listing Driver, Encryption and Auth Scheme for Every Connection

September 3, 2019
Pinal Dave
SQL Tips and Tricks
SQL Connection, SQL DMV, SQL Server, SQL Server Encryption, SQL Server Security

Inspect the auth scheme, encryption, driver interface, and protocol for current SQL Server connections, then group the results clearly.

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Do Stream Aggregate Operator Always Need Sort Operator? – Interview Question of the Week #240

September 1, 2019
Pinal Dave
SQL Interview Questions and Answers
Execution Plan, Parallel, SQL Operator, SQL Scripts, SQL Server

Question: Do Stream Aggregate Operator Always Need Sort Operator?

Answer: Absolutely No.Before I explain this question a bit more in detail.

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Illustrated cover: Stream Aggregate vs Gather Streams

SQL SERVER – Is Stream Aggregate is Same as Gather Streams of Parallelism?

August 30, 2019
Pinal Dave
SQL Tips and Tricks
Execution Plan, Parallel, SQL CPU, SQL Operator, SQL Scripts, SQL Server

Is Stream Aggregate is Same as Gather Streams of Parallelism? – This was one of the brilliant questions I had received during my recent engagement.

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Gouache illustration of Public role permissions, with a shared entrance key rack separate from individual locked cabinets.

SQL SERVER – Public Role Permissions and Effective Security Risk

August 28, 2019
Pinal Dave
SQL Tips and Tricks
SQL Login, SQL Scripts, SQL Server, SQL Server Security

Every database user belongs to Public and cannot be removed from that role. A reader asked whether the role should be eliminated.

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A small water gate controls which stream continues down a channel

How to Use a CASE Statement in the WHERE Clause? – Interview Question of the Week #239

August 25, 2019
Pinal Dave
SQL Interview Questions and Answers
SQL Sample Database, SQL Scripts, SQL Server

Question: How to Use a CASE statement in the WHERE Clause? Answer: First of all – CASE is not a statement but rather an expression.

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Gouache painting of a balance scale tipping toward a vermilion basket of apples against a few pears

Read Heavy Workload or Write Heavy: Measure It in SQL Server

August 24, 2019
Pinal Dave
SQL Performance
SQL Counter, SQL DMV, SQL Scripts, SQL Server

To tell a read heavy workload from a write heavy one, compare what the server reads with what it changes, and measure it over a window. This post counts reads and writes per table, reads the buffer and log counters with two snapshots, and explains what each lens misses.

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Gouache painting of three windows of different shapes in a courtyard wall all showing the same vermilion flowerpot

Actual Execution Plan in SQL Server: Graphical, Text and XML

August 22, 2019
Pinal Dave
SQL Performance
Execution Plan, SQL Scripts, SQL Server, SQL Server Management Studio

An actual execution plan shows how SQL Server really ran a query, with the true row counts beside the estimates. This post gets the plan three ways, as a graphical plan, as text with SET STATISTICS PROFILE and as XML, and uses a demo table to show how the estimate and the actual number can disagree.

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