SQL Server 2000 Stored Procedure & XML Programming in Visual Studio .NET

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SQL Server 2000 Stored Procedure & XML Programming
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Update locks Resemble shared locks more than they do exclusive locks. They are used to notify SQL Server that a transaction will later modify a resource. They prevent other transactions from acquiring exclusive locks. Update locks can coexist with shared locks. Just before the resource is modified, SQL Server promotes the update lock to an exclusive lock. Intent locks Set on an object of higher granularity to notify SQL Server that a process has placed a lock of lower granularity inside the object. For example, if a transaction places a lock on a page in a table, it will also place an intent lock on the table. The intent lock means that SQL Server does not have to scan the whole table to find out if a process has placed a lock on some page or record inside, in order to place a table lock for another transaction. In fact, there are three different types of intent locks: IS (intent share), IX (intent exclusive), and SIX (shared with intent exclusive). Schema locks Prevent the dropping or modifying of a table or index while it is in use. There are two types of schema locks. Sch-S (schema stability) locks prevent table or index drops. Sch-M (schema modification) locks ensure that other transactions cannot access the resource while it is being modified.
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You can change the default behavior of SQL Server using transaction isolation levels or lock hints. Transaction isolation levels set locking at the connection level, and lock hints set locking at the statement level. SQL Server can work on four different transaction isolation levels: Serializable The highest level in which transactions are completely isolated. The system behaves as though the transactions are occurring one after another. SQL Server will hold locks on both data and key records until the end of the transaction. This may lead to some performance issues. Repeatable Read Forces SQL Server to place shared locks on data records and hold them until the transaction is completed. Unfortunately, it allows phantoms, which occur when a transaction reads a range of records. There is no guarantee that some other concurrent transaction will not add records that fall in the range or modify keys of records so that they fall out of the range. If the uncommitted transaction repeats the read, the result will be inconsistent. Read Committed The default level in SQL Server. SQL Server places shared locks while reading. It allows phantoms and nonrepeatable reads. There is no
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C h a p t e r 6 : C o m p o s i t e Tr a n s a c t - S Q L C o n s t r u c t s : B a t c h e s , S c r i p t s , a n d Tr a n s a c t i o n s
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guarantee that the value of the record that a transaction reads multiple times during execution will stay consistent. Some other transaction could change it. Read Uncommitted The lowest level of isolation in SQL Server. It ensures that physically corrupt data is not read. SQL Server will not place shared locks, and it will ignore exclusive locks. You will have the fewest performance issues when using this level, but you will also likely have many data integrity problems. It allows phantoms, nonrepeatable reads, and dirty reads (everybody can see the content of the changed record, even if a transaction is not yet committed and could potentially be rolled back). The isolation level is specified in the Set statement. For example:
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