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What is the purpose of table hints in SQL Server like NOLOCK and READUNCOMMITTED?
Please explain this with example.
Also why can’t they be specified for tables modified by INSERT, UPDATE, or DELETE operations?
They allow you to set transaction isolation level on a table-by-table basis instead of for the entire query or connection.
They can also be used to trigger some features like minimal logging (use
TABLOCKwith the right trace flags set on anINSERTand it can be minimally logged).As a rule it’s a better idea to use connection-level settings.