![]() It ensures that a transaction has a completely isolated view of the data, and that no other transaction can modify the data while the current transaction is running. SERIALIZABLE: This is the highest isolation level. ![]() This eliminates the possibility of dirty reads and non-repeatable reads, but can lead to increased contention and reduced concurrency. REPEATABLE READ: This isolation level ensures that a transaction can only read data that has been committed by other transactions, and that data cannot be modified by other transactions until the current transaction is committed. This eliminates the possibility of dirty reads, but non-repeatable reads are still possible. It ensures that a transaction can only read data that has been committed by other transactions. READ COMMITTED: This is the default isolation level in SQL Server. This can lead to dirty reads (reading data that is later rolled back) and non-repeatable reads (reading data that is later modified by another transaction). It allows a transaction to read data that is being modified by other transactions, even if those transactions have not yet been committed. READ UNCOMMITTED: This is the lowest isolation level. There are several isolation levels in SQL Server, each with its own level of locking and concurrency control. In SQL Server, isolation refers to the level of locking and concurrency control used when multiple transactions access the same data simultaneously.
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