2025-10-22
1,534 reads
Locking
Optimized locking in Azure SQL Database
I don’t think I’ve ever had a great impression of Azure SQL Database as a place for production applications. In its early days, it was missing several important features (like data compression). While that hole has been plugged, there are still other limitations and differences you should be aware o
2024-02-02
Understanding Locking, Data Modification and Committing Data in SQL Server
Learn about how SQL Server uses locks when modifying data and how data is committed to a database after data changes.
2023-10-23
2023-10-09
486 reads
Transaction locking and row versioning guide
In any database, mismanagement of transactions often leads to contention and performance problems in systems that have many users. As the number of users that access the data increases, it becomes important to have applications that use transactions efficiently. This guide describes the locking and row versioning mechanisms the SQL Server Database Engine uses to ensure the physical integrity of each transaction and provides information on how applications can control transactions efficiently.
2022-10-05
The Lock Escalation Threshold – Part 1
This article isn’t about the act of lock escalation itself, which is already well documented and generally well understood. Some myths (like row locks escalating to page locks) persist, but challenging those yet again probably wouldn’t change much.
2022-09-19
2021-01-04
656 reads
2020-11-02
525 reads
Lock Scenarios Using sys.dm_tran_locks
Learn about the impact of locking and blocking in sessions through some demonstrations of different types of actions.
2020-06-11
8,350 reads
2020-02-20
697 reads
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Question of the Day
Adding new column with DEFAULT
Which number will the COUNT() return after executing the following statements:
DROP TABLE IF EXISTS #test; CREATE TABLE #test (id INT) INSERT INTO #test (id) SELECT * FROM GENERATE_SERIES(1, 3) AS gs ; ALTER TABLE #test ADD flag BIT CONSTRAINT DF_#test_flag DEFAULT 0; go UPDATE #test SET flag = 0 WHERE id = 1 UPDATE #test SET flag = 1 WHERE id = 2 INSERT INTO #test (id) VALUES (4) SELECT COUNT(*) FROM #test AS t WHERE flag = 0See possible answers