Top "Transaction-isolation" questions

Transaction isolation relates to the visibility and impact of changes made in one transaction on concurrent transactions.

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 to Select UNCOMMITTED rows only in SQL Server?

I am working on DW project where I need to query live CRM system. The standard isolation level negatively influences …

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What is default isolation level hibernate uses if not explicitly set?

I have an application that uses hibernate version 3.6.4, and c3p0 version 0.9.1.2 for connection pooling. My underlying RDBMS is MySql …

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Isolation levels in oracle

I would like to know different isolation levels with respect to commit, and would also like to know about row-level …

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Atomic UPDATE .. SELECT in Postgres

I'm building a queuing mechanism of sorts. There are rows of data that need processing, and a status flag. I'm …

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Snapshot isolation transaction aborted due to update conflict

Following statement: INSERT INTO dbo.Changes([Content], [Date], [UserId], [CompanyId]) VALUES (@1, @2, @3, @4); SELECT @@identity; gives me this SQL error 3960: Snapshot isolation …

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Can commit be applied to every INSERT INTO in a script?

I have just moved from SQL Server to ORACLE, and I am working on a script (SQL Server style). In …

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NOLOCK vs. Transaction Isolation Level

What's the difference between using "SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED" and NOLOCK? Is one better than the other?

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PostgreSQL Transaction Isolation READ UNCOMMITTED

I want to try transaction isolation using PostgreSQL with pgadmin. First I inserted a new record inside BEGIN but without …

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Problem with SQL transaction isolation level

i have a problem with transaction isolation levels. There are two tables involved, first one is updated frequently with transaction …

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