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Two lobster pots on a harbor quay, one crammed with seaweed and shells, the other holding one lobster.

Query Store Capture Modes: ALL, AUTO and CUSTOM

January 10, 2014
Pinal Dave
SQL Performance
Query Store, SQL Performance, SQL Server, SQL Server Configuration

Choose a Query Store capture mode for your workload, inspect ALL, AUTO, CUSTOM and NONE, and tune thresholds without losing useful history.

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Diagram of the infrastructure stack from the internet and firewall through web servers, an app middle tier, databases and the SQL Server instance, down to the operating system, disk configuration, VM and virtual disks; a red callout says Most only tune here at the databases and the instance

SQL Server Performance Stack: Look Beyond the Query

December 25, 2013
Pinal Dave
SQL Tips and Tricks
Disk, Notes from the Field, SQL Performance, SQL Server, Virtualization

Tuned every query and SQL Server is still slow? David Klee looks at the SQL Server performance stack, from storage and virtualization to the network. He also explains why a baseline matters.

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A chimney brush with soot on its bristles beside marked and clean hearth bricks

Investigating a Past Slowdown With the system_health Session

December 24, 2013
Pinal Dave
SQL Tips and Tricks
SQL Extended Events, SQL Monitoring, SQL Performance

Nobody was tracing when it got slow. The system_health session was. Here is how to read what it kept before the files roll over.

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Gouache painting: a convention corridor with three open doorways and a potted palm, one door painted vermilion

SQLLive 360 Orlando 2013: Notes from a Great Experience

December 8, 2013
Pinal Dave
Personal
Conferences, SharePoint, SQL Performance, SQLAuthority Author Visit

I presented three sessions at SQLLive 360 in Orlando, Florida, on November 19 and 20, 2013. It was my first time in Orlando. These are my notes from the event, with a few photos.

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A narrow funnel and a wide funnel stand beside different piles of dry grains.

Why the Same Query Is Fast Then Suddenly Slow

December 1, 2013
Pinal Dave
SQL Performance
Best Practices, SQL Index, SQL Performance, SQL Server

Recognize parameter sniffing by comparing compiled values, data distribution, and reused plans, then test a remedy with its tradeoffs.

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A heavily loaded canvas log sling beside a small bundle of kindling

SELECT * Cost: Why Wide Result Sets Slow Exports

November 20, 2013
Pinal Dave
SQL Tips and Tricks
SQL Data Storage, SQL Index, SQL Performance

The query starts fast but the export crawls. A small demo shows how much a wide text column adds, and what to measure on your own server.

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Braided garlic hanging under a shed roof beside garden rows that are still growing

Real-Time Operational Analytics With a Filtered Columnstore Index

November 6, 2013
Pinal Dave
SQL Performance
ColumnStore Index, SQL Index, SQL Performance, SQL Server

Build real-time operational analytics with a filtered columnstore index, inspect batch-mode plans and rowgroups, and measure write costs.

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