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Should I Learn Fulltext Indexing? (Dear SQL DBA Episode 29)
This week’s question is about a longstanding feature in SQL Server that sounds really cool: full-text search. If you’re learning performance tuning, how much time should you invest in researching and...
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Index Types: Heaps, Primary Keys, Clustered and Nonclustered Indexes (Dear...
Dear SQL DBA… I see HEAP tables are found even when I know those tables have a clustered index, and I see a lot of forwarded records. This happens to 5 tables in my database. I can see the clustered...
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Which Filegroup is that Partition Using? How Many Rows Does It Have?
Table Partitioning in SQL Server has a bit of a learning curve. It’s tricky to just figure out how much data you have and where the data is stored. When you’re designing or managing partitioned...
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Does Truncate Table Reset Statistics?
Short answer: the SQL Server optimizer will know that the table was truncated, but statistics might not update when you expect. For the long answer, let’s walk through an example using the...
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Should I Upgrade to SQL Server 2016? (Dear SQL DBA Episode 22)
It’s a big week for SQL Server! And it’s the perfect week to talk about this week’s question, which is about explaining to your management why it’s worth it to upgrade to SQL Server 2016, and which...
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SQL Server 2016 SP1: Features Added to Standard, Web, Express, Local DB Editions
Wouldn’t it be awesome if you could develop your application for a small SQL Server using the same features that you intend to use for scale? And wouldn’t it be more awesome if you could start using...
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Filtered Indexes: Rowstore vs Nonclustered Columnstore
SQL Server has two types of filtered indexes: The “classic” filtered nonclustered rowstore index, introduced in SQL Server 2008, available in all editions The newfangled filtered nonclustered...
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What’s Adaptive Query Processing? (Dear SQL DBA Episode 21)
I’m mixing things up a bit in this episode. I want to talk about a question that keynotes and sessions at the SQL PASS Summit got me thinking about last week. Let’s talk about Adaptive Query...
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Index Tuning Decision Tree for SQL Server
I recently mapped out my thought process for how I approach a new instance of SQL Server when it comes to index tuning. It now looks like this: Highlight: Can I use Query Store? One of the first...
View ArticleLearn Index Tuning at the PASS Summit in 2016!
I’m excited to announce that I’ll be giving a pre-conference session on index tuning, plus a general session on locking and blocking at the PASS Summit in Seattle this October! Here’s a description...
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What Resets sys.dm_db_index_usage_stats and Missing Index DMVs?
Managing indexes got trickier with SQL Server 2012. SQL Server has tracked and reported statistics on how often indexes are used and requested since SQL Server 2005. As of SQL Server 2012, suddenly...
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SQL Server’s YEAR() Function and Index Performance
SQL Server’s really clever about a lot of things. It’s not super clever about YEAR() when it comes to indexes, even using SQL Server 2016 — but you can either make your TSQL more clever, or work...
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Does OPTION (RECOMPILE) Prevent Query Store from Saving an Execution Plan?
Recompile hints have been tough to love in SQL Server for a long time. Sometimes it’s very tempting to use these hints to tell the optimizer to generate a fresh execution plan for a query, but there...
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Telemetry_xevents, NT SERVICE\SQLTELEMETRY, and XE_LIVE_TARGET_TVF in SQL...
When kicking the tires of SQL Server 2016 CTP3, I was interested to find a new session defined in the Extended Events folder. Hello, telemetry_xevents! Why, I don’t remember creating this myself....
View ArticleLearn Index Tuning at the PASS Summit in 2016!
I’m excited to announce that I’ll be giving a pre-conference session on index tuning, plus a general session on locking and blocking at the PASS Summit in Seattle this October! Here’s a description...
View ArticleClik here to view.
SQL Server 2016 RC0 Fixes Index Usage Stats Bug, But Missing Indexes Still...
Managing indexes got trickier with SQL Server 2012. SQL Server has tracked and reported statistics on how often indexes are used and requested since SQL Server 2005. As of SQL Server 2012, suddenly all...
View ArticleClik here to view.
SQL Server’s YEAR() Function and Index Performance
SQL Server’s really clever about a lot of things. It’s not super clever about YEAR() when it comes to indexes, even using SQL Server 2016 — but you can either make your TSQL more clever, or work around...
View ArticleClik here to view.
Does OPTION (RECOMPILE) Prevent Query Store from Saving an Execution Plan?
Recompile hints have been tough to love in SQL Server for a long time. Sometimes it’s very tempting to use these hints to tell the optimizer to generate a fresh execution plan for a query, but there...
View ArticleClik here to view.
Telemetry_xevents, NT SERVICE\SQLTELEMETRY, and XE_LIVE_TARGET_TVF in SQL...
When kicking the tires of SQL Server 2016 CTP3, I was interested to find a new session defined in the Extended Events folder. Hello, telemetry_xevents! Why, I don’t remember creating this myself....
View Article
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