Read Uncommitted Isolation
If you set the Read Uncommitted mode for a session, no isolation is provided to the SELECT
queries in that session. A transaction that is running with this isolation level is not immune to dirty reads, nonrepeatable reads, or phantom reads.
To set the Read Uncommitted mode for a session, you run the following statements from the client:
• T-SQL—Use SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED
.
• ODBC—Use the function call SQLSetConnectAttr
with Attribute
set to SQL_ATTR_TXN_ISOLATION
and ValuePtr
set to SQL_TXN_READ_UNCOMMITTED
.
• OLE DB—Use the function call ITransactionLocal::StartTransaction
with the isoLevel
set to ISOLATIONLEVEL_READUNCOMMITTED
.
• ADO—Set the IsolationLevel
property of the Connection
object ...
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