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oStress vs SSMS: What Each Tool Is Built to Measure

April 28, 2020
Pinal Dave
SQL Performance
Command Line, SQL Scripts, SQL Server Management Studio, Testing

oStress vs SSMS is not a race, because the tools measure different things. This post times 10,000 inserts in three ways with a clock inside the script, then shows how eight sessions finish the same work faster. It explains what a one-session loop really measures.

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oStress Load Test: Run Many Sessions Against SQL Server

April 27, 2020
Pinal Dave
SQL Performance
Command Line, SQL Server, sqlcmd, Testing

An oStress load test runs one query from many connections at once, so you can watch SQL Server under a crowd. This post explains the main switches and runs a small first test with five connections. It also builds the same test with sqlcmd workers, for machines without oStress.

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Matching aqueduct couplings carry water while a mismatched spare segment remains separate

What is Transactional Replication Supported Version Matrix? – Interview Question of the Week #274

April 26, 2020
Pinal Dave
SQL Interview Questions and Answers
AlwaysOn, SQL High Availability, SQL Replication, SQL Server

Question: What is the Transactional Replication Supported Version Matrix?

The rules for the supported versions are pretty simple and clearly written.

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Query Store On or Off for Every Database: Review First

April 25, 2020
Pinal Dave
SQL Tips and Tricks
Query Store, SQL DMV, SQL Scripts, SQL Server Configuration

To turn Query Store on or off for every database, you need one statement per database, because there is no server switch. This post builds a tested script that writes the statements, lets you read them and then runs them in one batch. It also covers READ_ONLY mode and the model database.

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Gouache painting of a row of white beehives in a meadow, some open and some closed, one vermilion

Query Store Status for Every Database in SQL Server

April 24, 2020
Pinal Dave
SQL Performance
Query Store, SQL DMV, SQL Scripts, SQL Server Configuration

Query Store status for every database takes two queries, and the first is not enough. This post builds four demo databases, shows why the is_query_store_on flag hides frozen and read-only states, and runs one script that reads the real state of each database. It also shows what Query Store costs in memory.

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SSMS Command Timeout: What the Execution Time-out Does

April 23, 2020
Pinal Dave
SQL Tips and Tricks
SQL Extended Events, SQL Server Configuration, SQL Server Management Studio, Testing

The SSMS command timeout is the number of seconds a query window waits before it cancels a batch. This post lists the four places a time-out can come from and reproduces a client time-out with sqlcmd and PowerShell. It also shows how an Extended Events session proves that the client gave up.

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SSMS ROWCOUNT Setting: Why Your Query Stops at 100 Rows

April 22, 2020
Pinal Dave
SQL Tips and Tricks
Execution Plan, SQL Performance, SQL Server Configuration, SQL Server Management Studio

The SSMS ROWCOUNT setting limits every query in a window to a fixed number of rows, and it can change the plan as well. This post shows the effect on rows, reads and plan with a tested demo, how to check your own session and why UPDATE statements stop at the limit too.

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