April 2001
Beginner
792 pages
17h 51m
English
Content preview from Microsoft® SQL Server™ 2000 Programming by ExampleBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Types of Locks
SQL Server uses locks to provide concurrency while maintaining data consistency and integrity. Whenever you read data, SQL Server locks the data while reading, to prevent other connections from modifying provide the data at the same time.
If you modify data, SQL Server locks that data as long as the transaction lasts to avoid dirty reads in other connections. These locks are called exclusive locks, and they are incompatible with any other locks.
SQL Server uses other types of locks to prevent specific concurrency problems and to guarantee the consistency of internal operations.
Locks are maintained as long as they are necessary, depending on the isolation level selected. It is the programmer's responsibility to design short transactions ...
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