2017-07-10
898 reads
Performance
Performance Myths : Truncate Can't Be Rolled Back
Derik Hammer sets out to disprove another pervasive performance myth : TRUNCATE is faster than DELETE because it isn't logged and can't be rolled back.
2017-06-01
4,663 reads
Performance Myths: Table variables are always in-memory
Guest author Derik Hammer dismisses the common myth that table variables perform better than temp tables because they are always in memory.
2017-05-11
5,730 reads
Harmful, Pervasive SQL Server Performance Myths
Aaron Bertrand begins a new series around disproving prevalent myths regarding SQL Server performance.
2017-04-13
4,686 reads
Finding the Worst Performing TSQL Statement
Greg Larsen explains how you can use Dynamic Management Objects and stored procedures to return your worst performing T-SQL statements.
2017-03-06
5,202 reads
Performance Surprises and Assumptions : GROUP BY vs. DISTINCT
Aaron Bertrand acknowledges that DISTINCT and GROUP BY are usually interchangeable, but shows there are cases where one performs better than the other.
2017-02-23
8,502 reads
How Incorrect SQL Server Table Statistic Estimates Can Cause Slow Query Execution
Ben Snaidero explains that if you are updating your SQL Server table statistics nightly, but still seeing occasional poor performance with some of the queries being executed against my database, statistics could be the issue.
2017-02-09
4,089 reads
Disconnecting SQL Server connections after query execution
One way to improve SQL Server performance is to use as few resources as possible. In this post Rahul Mehta demonstrates how you can do this by disconnecting queries post-execution with a simple change in SSMS.
2016-12-21
5,620 reads
5 Advantages of Load Balancing For IT Companies
As an IT company, it is crucial that you maintain uptime and monitor the performance of various processes. By making database load balancing a key element, you can ensure that your processes and websites run smoothly. Tony Branson explains.
2016-11-24
5,719 reads
Sparse Columns in SQL Server : Impact on Time & Space
Erin Stellato (@erinstellato) looks into sparse columns in SQL Server – the changes to space requirements and the impact on the write portion of your workload.
2016-03-15
3,581 reads
Blogs
Keeping Track of my ConEmu CLIs
By Steve Jones
I use ConEmu for my terminal interface. I’m still on Windows 10 at home,...
10 Decisions to Make Before You Create A Fabric Workspace
Creating a Fabric workspace takes about 30 seconds. Restructuring workspaces after people have built...
Flyway Tips: Object History
By Steve Jones
It’s a small change, but a handy one. Flyway Desktop (FWD) now includes the...
Forums
Adding new column with DEFAULT II
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Advanced Deployment Scenarios: Stairway to Reliable Database Deployments Level 7
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You Need a DBA Pipeline
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Question of the Day
Adding new column with DEFAULT II
Which number did the two COUNT(*) return:
DROP TABLE IF EXISTS #tmp CREATE TABLE #tmp (id INT NOT NULL) INSERT INTO #tmp (id) SELECT gs.value FROM GENERATE_SERIES(1, 5) AS gs ALTER TABLE #tmp ADD my_value INT NOT NULL CONSTRAINT df_tmp_my_value DEFAULT 1 SELECT COUNT(*) FROM #tmp AS t WHERE my_value = 1 ALTER TABLE #tmp DROP CONSTRAINT df_tmp_my_value ALTER TABLE #tmp ADD CONSTRAINT df_tmp_my_value DEFAULT 2 FOR my_value SELECT COUNT(*) FROM #tmp AS t WHERE my_value = 1See possible answers