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Connection 1
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SET TRANSACTION ISOLATION LEVEL SERIALIZABLE; BEGIN TRAN; SELECT * FROM Test.TestTran WHERE Col1 = 1; /* Returns 2 rows. */
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Connection 2
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SET TRANSACTION ISOLATION LEVEL READ COMMITTED;
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SELECT * FROM Test.TestTran; /* Returns the 2 rows in the table. This statement is allowed because it does not change any rows that are included in the transaction in connection 1. */ UPDATE Test.TestTran SET Col1 = 2 WHERE Col1 = 1; /* This statement is now blocked by connection 1 because it would cause the transaction in connection 1 to experience a non-repeatable read. */
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Lesson 1: Understanding the Available Transaction Isolation Levels
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Connection 1
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SELECT * FROM Test.TestTran WHERE Col1 = 1; /* Still returns 2 rows, i.e. a non-repeatable read did not occur. */
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Connection 2 Still blocked...
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/* Abort the above query and execute the following insert statement. */ INSERT Test.TestTran (Col1, Col2) VALUES (1, 3); /* This statement is also blocked, exactly as the update was, because it would cause the transaction in connection 1 to experience a phantom read. */
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SELECT * FROM Test.TestTran WHERE Col1 = 1; /* Still returns 2 rows, i.e. a phantom read did not occur. */
/* Abort the above query and execute the following insert statement. */ INSERT Test.TestTran (Col1, Col2) VALUES (2, 1); /* This statement is also blocked, exactly as the previous insert was. This happened even though the row inserted by this statement would not be included in the query in connection 1. This in turn is because SQL Server found no index to lock a range in, so it locked the entire table. */
COMMIT TRAN;
The row from the above insert is now completed.
-- Drop the table used in this example. DROP TABLE Test.TestTran;
6
Designing Transactions and Transaction Isolation
Snapshot Isolation Level
SQL Server 2005 introduces the snapshot isolation level in addition to the four isolation levels defined by the SQL-99 standard. This isolation level can be very useful because it protects against all of the previously mentioned concurrency problems, just as the serializable isolation level does. However, it does not provide this protection by blocking access to rows by other transactions; it does so by storing versions of rows while the transaction is active as well as tracking when a specific row was inserted. This means that while in a transaction in the snapshot isolation level, depending on what has occurred since the transaction was started, you might not be looking at the current version of a row, but rather an older version of the row presenting it as it looked when the transaction first accessed it. Because of this, when working in the snapshot isolation level, the transaction can be considered to be executing in an alternate reality. For more information on the snapshot isolation level, see the article Using Snapshot Isolation at http://msdn2.microsoft.com/en-us/library/tcbchxcb.aspx. If a transaction is started by executing the BEGIN TRANSACTION statement (the transaction is actually started when the first statement within it is executed) at 5:02 A.M., for example, it will only return data from this exact point in time, independent of how many rows are being deleted, inserted, or updated while the transaction is active. The older row versions are stored as a linked list of rows in the tempdb system database. There can be multiple versions of a single row at any point in time in order to service multiple snapshot transactions starting at different points in time. When snapshot transactions are being used, the tempdb database experiences additional activity and might require additional disk space. Because of storage of row versions, write operations will suffer some performance degradation. The snapshot isolation level can be particularly useful for read intensive databases and for databases that have performance problems caused by blocking. If you are looking for performance improvement only and can accept dirty reads, remember that the read uncommitted isolation level provides the best performance.
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