Combining R and SQL Server to diagnose performance bottlenecks
Using clustering algorithms to analyse index usage data from SQL Server’s DMVs & simplify complex performance investigations.
2017-05-29 (first published: 2015-12-07)
9,917 reads
Performance
2015-09-21
1,659 reads
Analyzing I/O Performance for SQL Server
Inadequate storage is one of the most common bottlenecks seen in subsystem performance. There are a number of reasons for poor storage performance, but measuring it and understanding what needs to be measured and monitored is always a useful exercise.
2015-07-21
5,049 reads
Query Performance Report
The procedure created by this script rolls up the collected query execution statistics and groups them daily by the plan hash value.
2016-01-20 (first published: 2015-05-13)
5,464 reads
SQL Server 2014 Checklist for Performance
A checklist to help optimize the performance of SQL Server
2014-12-29
8,788 reads
2014-12-17
1,954 reads
Using DBCC DROPCLEANBUFFERS When Testing Performance
Over the years I've had many discussions with other SQL Server Database Administrators as to whether or not you should have the database buffer pool loaded with data pages or empty when testing queries for performance. This tip will take a look at the effects on query performance for both cases by using the DBCC DROPCLEANBUFFERS statement to empty the buffer pool.
2014-06-20
8,763 reads
SQL Server CPU Usage History Histogram
Returns a summary of CPU usage by SQL Server over the last 4 hours (default).
Using the sample values collected in the dm_os_ring_buffers dmv, this query will show CPU usage by the SQL Server process for the last for hours even if you have no other benchmarking activities in place on your server yet.
2015-09-18 (first published: 2014-05-14)
5,602 reads
2014-05-01
1,668 reads
2014-01-29
1,662 reads
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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