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Indexing

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How To Fix Forwarded Records

Tara Kizer
Index Maintenance, SQL Server
72 Comments
Some of our clients have very high forwarded record counts and aren’t aware of it until they run sp_BlitzFirst and get an alert about high Forwarded Records per Second. Some of these clients are using Ola Hallengren‘s IndexOptimize stored procedure to maintain their indexes. This brought up a question of whether or not rebuilding a…
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Where Do Missing Index Requests Come From?

Erik Darling
Indexing, sp_BlitzIndex
1 Comment
Be honest, here You don’t care about most indexing problems. Duplicates, Borderline Duplicates, Unused, Wide, Non-aligned Partitions… All you’re here for are the Missing Indexes. Wham, bam, your query finishes in less than a second, ma’am. Take this quarter, go downtown and have a rat gnaw that thing off your face. And I get it.…
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Tara Kizer

Spring Cleaning Your Databases

Tara Kizer
Index Maintenance, SQL Server
11 Comments
Even with lots of monitoring in place, we should perform periodic checks of our SQL Servers. Think of this like “Spring Cleaning”, except I would recommend that it be more frequently than just once a year. Doing it monthly might be a bit ambitious due to our busy schedules, but quarterly could be achievable. Below are…
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Indexes Helping Indexes

Erik Darling
Indexing, SQL Server
20 Comments
This post isn’t going to solve any problems for you It was just something I stumbled on that struck me as funny, while working on a demo for something else. Brent didn’t believe it at first, so I thought I’d share with the class. Blog. You, Your Name Here. Hiya! So there I was, creating…
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Unique Indexes and Row Modifications: Weird

Erik Darling
Indexing, SQL Server
3 Comments
Confession time This started off with me reading a blurb in the release notes about SQL Server 2016 CTP 3.3. The blurb in question is about statistics. They’re so cool! Do they get fragmented? NO! Stop trying to defragment them, you little monkey. Autostats improvements in CTP 3.3 Previously, statistics were automatically recalculated when the…
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Filtered Indexes: Just Add Includes

Erik Darling
Indexing, SQL Server
27 Comments
I found a quirky thing recently While playing with filtered indexes, I noticed something odd. By ‘playing with’ I mean ‘calling them horrible names’ and ‘admiring the way other platforms implemented them‘. I sort of wrote about a similar topic in discussing indexing for windowing functions. It turns out that a recent annoyance could also…
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Does Creating an Indexed View Require Exclusive Locks on an Underlying Table?

Kendra Little
Indexing, Locking, Blocking, and Isolation Levels, SQL Server
0
An interesting question came up in our SQL Server Performance Tuning course in Chicago: when creating an indexed view, does it require an exclusive lock on the underlying table or tables? Let’s test it out with a simple indexed view run against a non-production environment. (AKA, a VM on my laptop running SQL Server 2014.)…
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Filtered Indexes and IS NOT NULL

Kendra Little
Indexing, SQL Server
22 Comments
Filtered indexes can be tricky. Just getting your queries to use the filtered index can be a real pain. Parameterization may mean it’s “unsafe” to use the filtered index. The optimizer might want the filtered column in your key or include column list when it doesn’t seem like it should have to be there. The…
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Finding Tables with Nonclustered Primary Keys and no Clustered Index

Erik Darling
Indexing, SQL Server
30 Comments
i’ve seen this happen Especially if you’ve just inherited a database, or started using a vendor application. This can also be the result of inexperienced developers having free reign over index design. Unless you’re running regular health checks on your indexes with something like our sp_BlitzIndex® tool, you might not catch immediately that you have…
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