Sql Read Uncommitted. If my normal query was: No shared locks are held to block other transactions from reading the modifying data.
SQL Explained In Simple Way Isolation Levels
Web the isolation level of the transactional support is default to read uncommitted. Web imagine you read dirty record with query like: This isolation level allows dirty reads. Select field1, field2 from table where some_type_of_clause. Select * from dbo.mytable with (nolock) and for example got record with id = 1 and name = 'somevalue'. Set transaction isolation level read uncommitted select * from table1 t1 inner join table2 t2 on t1.id = t2.id. Update dbo.mytable set name = 'anothervalue' where id = 1. Web i am using sql server express 2008 w/ adventureworkslt2008 db to understand the different between read committed & read uncommitted. If my normal query was: Read uncommitted applies nolock to all tables in a session.
When a transaction reads modified data that has not been committed by another transaction. It simply restricts the reader from seeing any intermediate, uncommitted, 'dirty' read. Web 784 read committed is an isolation level that guarantees that any data read was committed at the moment is read. Web imagine you read dirty record with query like: Read uncommitted applies nolock to all tables in a session. When a transaction reads modified data that has not been committed by another transaction. This isolation level allows dirty reads. Select field1, field2 from table where some_type_of_clause. Web the isolation level of the transactional support is default to read uncommitted. Web read uncommitted is the weakest isolation level because it can read the data which are acquired exclusive lock to the resources by the other transactions. Web the single difference is that you can apply with (nolock) selectively, on some tables but not others.
