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Schema
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There are two categories of schema lock mode: schema modification and schema stability. Schema modification (Sch-M) lock mode is used when a table data definition language (DDL) operation is performed, such as the addition of a column to a table or deletion of a table, or when certain data manipulation language (DML) operations are performed, such as truncating a table. While this lock is held, no users can access the table. Schema stability (Sch-S) lock mode is used when queries are being compiled. When a query is compiled, other transactional locks are not blocked, including exclusive locks,
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but DDL and DML statements that use a schema modification (Sch-M) lock cannot be executed on the table while there is a schema stability lock.
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Bulk update lock mode is used when you are bulk copying data into a table with either the TABLOCK hint specified or when the table lock on bulk load option is set by using the sp_tableoption stored procedure. The purpose of the bulk update lock is to allow multiple threads to bulk copy data concurrently into the same table while preventing access to that table by any processes that are not performing a bulk copy.
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Key-range lock mode is used to lock index rows in order to fulfill the requirement for transactions using the serializable isolation level that any query executed during the transaction will retrieve the same set of rows if executed more than once during the transaction. By locking the index rows of the index keys accessed for the duration of the transaction, no rows whose key falls within the range of the locked index keys can be inserted, updated, or deleted. This protects the rows so that the transaction can read repeatable data later in the transaction. This prevents the scenario called phantom read, which could otherwise occur when a transaction reads a range of rows, and then a second transaction inserts or deletes rows in that same range. Then the first transaction then reads the range of rows a second time, resulting in a different result set than with the first query. Phantom rows appeared or disappeared during the first transaction.
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You can view current locks held by selecting from the system view sys.dm_tran_locks. (The sp_lock procedure used to view locks in previous versions of SQL Server is supported for backward compatibility only.) To show an example of locking, run the following T-SQL that creates a test table and inserts two rows for our test:
USE AdventureWorks; CREATE TABLE test1(col1 int); INSERT INTO test1 VALUES (1); INSERT INTO test1 VALUES (2);
To create the ability to capture the specific lock information for this example, we open three connections to the server via Management Studio Query Editor. We will run an update on test1 in one window with a time delay before the transaction commits, perform a query on test1 in the second window, and view the lock information in the third
17
Transactions and Locking
window. To accomplish this, in the first Query Editor window, run the following explicit transaction with an UPDATE and a WAITFOR DELAY statement as follows:
Use AdventureWorks; BEGIN TRAN UPDATE test1 SET col1=999 WHERE col1=1; WAITFOR DELAY 00:00:15 ; COMMIT;
Immediately from the second connection, run the following SELECT statement, using default autocommit transaction mode:
USE AdventureWorks; SELECT * FROM test1;
The SELECT should block on the UPDATE for 15 seconds (time for the WAITFOR DELAY command to complete and then the UPDATE to commit). Immediately go to the third window and run the following query to view the current locks held:
SELECT resource_type, request_mode, request_status, request_session_id FROM sys.dm_tran_locks
The results will look similar to the following, where request_session_id is the server process identifier (SPID) for the connection, assuming no other processes are running on the server:
resource_type request_mode request_status request_session_id --------------- --------------- -------------------- -----------------DATABASE DATABASE RID RID PAGE PAGE OBJECT OBJECT S S X S IS IX IS IX GRANT GRANT GRANT WAIT GRANT GRANT GRANT GRANT 53 52 52 53 53 52 53 52
The resource_type column shows the type of resource on which the lock is held, the request_mode column shows the lock mode, and the request_status column shows the status for the lock request. For resource_type, OBJECT is equivalent to table. You can see from the above output that SPID 53 (the SELECT) was blocked by SPID 52
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