SQL Server Concurrency

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SQL Server Concurrency

If you've designed your SQL code intelligently, and implemented a sensible indexing strategy, there's a good chance your queries will "fly", when tested in isolation. In the real world, however, where multiple processes can access the same data at the same time, SQL Server often has to make one process wait, sacrificing concurrency and performance, in order that in order that all can succeed, without destroying data integrity. Transactions are at the heart of concurrency. I explain their ACID properties, the transaction isolation levels that dictate the acceptable behaviors when multiple transactions access the same data simultaneously, and SQL Server's optimistic and pessimistic models for mediating concurrent access. Pessimistic concurrency, SQL Server's default, uses locks to avoid concurrency problems. I explain all the different locks and their compatibility. I show how to control locking with hints and bound connections, and how to troubleshoot excessive blocking and deadlocking. Optimistic concurrency uses row versions to support concurrency. I explain how row versioning works, cover SQL Server's two Snapshot-based isolation levels and offer troubleshooting tips for issues such as update conflicts. Your application can have world-class indexes and queries, but they won't help you if you can't get your data, because another application has it locked. That's why every DBA and developer must understand SQL Server concurrency, and how to troubleshoot any issues. I hope my book helps!

Country	USA
Author	Kalen Delaney
Binding	Paperback
Brand	Brand: Red gate books
EAN	9781906434915
Feature	Used Book in Good Condition
ISBN	1906434913
Label	Red gate books
Manufacturer	Red gate books
MPN	black & white illustrations
NumberOfItems	1
NumberOfPages	202
PartNumber	black & white illustrations
PublicationDate	2012-09-11
Publisher	Red gate books
Studio	Red gate books
ReleaseDate	0000-00-00

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