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Category: Indexes

Indexes / Tips & Tricks

SQL Index Creation Tutorial (Part 3): Composite Index Construction

Example: Estimated Execution Plan: 1. Open the index properties and select the Predicates section: 2. Copy the content: 3. Paste it into a prepared query and clean up the unnecessary …

Indexes / Tips & Tricks

SQL Index Creation Tutorial (Part 2): Performance and Execution Plans

Data source: Original query Estimated Execution Plan 1 Estimated Subtree Cost: 586.232 → far too high, indicating long execution time and heavy server load. The plan shows: Creating indexes Index …

Indexes / Tips & Tricks

SQL Index Creation Tutorial (Part 1): Heap Tables and Basics

Example: Data source: Heap table (a heap without a clustered index) Address_TEST, 9,963,912 rows, no nonclustered indexes. Query: Estimated Execution Plan 1: Estimated Subtree Cost: 143.514 – high number = …

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Brent Ozar’s Blog

I’m Coming to the #PassDataSummit in Seattle!
I’m Coming to the #PassDataSummit in Seattle!

The lineup for the PASS Data Community Summit Seattle event was just released,and I’m proud to share that I’ll be teaching my new all-day pre-conference workshop. Dev-Prod Demon Hunters: Finding [...]

We’re Discontinuing SQL ConstantCare and the Consultant Toolkit. Here’s Why.
We’re Discontinuing SQL ConstantCare and the Consultant Toolkit. Here’s Why.

About ten years ago, I sketched out an idea for a different kind of SQL Server monitoring tool: one that gathered data just once per day, and gave you a [...]

[Video] Office Hours: Off St. Thomas
[Video] Office Hours: Off St. Thomas

I’m at sea again, this time cruising aboard the Disney Treasure off of St. Thomas. Let’s go through your top-voted questions from https://pollgab.com/room/brento. 00:00 Start 01:40 DbaMan: You have been [...]

And Then There Was The Time RCSI Actually Made Query Results More Accurate.
And Then There Was The Time RCSI Actually Made Query Results More Accurate.

Normally when I tell people about SQL Server’s optimistic concurrency isolation levels, Read Committed Snapshot Isolation (RCSI) and Snapshot Isolation (SI), I have to give them a little speech about [...]

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