Top "Isolation-level" questions

Isolation level defines what data an SQL transaction can view or access while other transactions work with the same data.

Why use a READ UNCOMMITTED isolation level?

In plain English, what are the disadvantages and advantages of using SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED in a query …

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Difference between "read commited" and "repeatable read"

I think the above isolation levels are so alike. Could someone please describe with some nice examples what the main …

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How to find current transaction level?

How do you find current database's transaction level on SQL Server?

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How to detect READ_COMMITTED_SNAPSHOT is enabled?

In MS SQL Server is there a way to detect whether a database has had its isolation level set via …

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Transaction isolation levels relation with locks on table

I have read about 4 levels of isolation: Isolation Level Dirty Read Nonrepeatable Read Phantom Read READ UNCOMMITTED Permitted Permitted Permitted …

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What is the difference between Non-Repeatable Read and Phantom Read?

What is the difference between non-repeatable read and phantom read? I have read the Isolation (database systems) article from Wikipedia, …

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How long should SET READ_COMMITTED_SNAPSHOT ON take?

How long should it take to run ALTER DATABASE [MySite] SET READ_COMMITTED_SNAPSHOT ON I just ran it and …

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Read committed Snapshot VS Snapshot Isolation Level

Could some one please help me understand when to use SNAPSHOT isolation level over READ COMMITTED SNAPSHOT in SQL Server? …

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What is (are) difference between NOLOCK and UNCOMMITTED

I use SQL Server 2012. I write two queries but what is a different between NOLOCK and UnCommitted ? SELECT lastname, firstname …

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Setting transaction isolation level of MySQL

How do I set the isolation level of MySQL 5.1 InnoDB? By entering: mysql> show variables like '%isola%'; …

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