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Unlike Commit statements, only one Rollback statement is required to close a set of nested transactions. In fact, if more than one Rollback statement is executed, SQL Server will raise another error.
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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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SQL Server places locks on data that has been modified by a transaction, to prevent other users from further changing the data until the transaction is committed. This feature can lead to problems if a transaction takes too long to complete.
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There is no exact definition of too long. The longer a transaction works, the greater the likelihood that problems will occur.
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Some of the problems that might occur if a long transaction is present in the database include the following: Other users are blocked. They will not be able to access and modify data. The transaction log fills up. (SQL Server 2000 and SQL Server 7.0 can be configured to automatically increase the size of the transaction log, but you could fill your disk as well.) Most of the time, transaction log work is performed in memory. If all available memory is used before the transaction is complete, SQL Server will start saving changes to disk, thus reducing the overall performance of the server.
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You should be particularly aware of concurrency problems because they are the problems most likely to happen. While you are developing applications, you will probably work alone (or in a small group) on the server, but the situation will change drastically when you place 50, 250, or 5000 concurrent users on the production server.
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CHAPTER
Debugging and Error Handling
IN THIS CHAPTER:
Debugging Error Handling
SQL Server 2000 Stored Procedure & XML Programming
ebugging and error handling seem like such negative topics. By admitting debugging as a necessary phase of development and error handling as a required practice, we seem to admit to weakness in our abilities as developers. But we are not the computers themselves: we cannot account for all contingencies when we write code. So, to find the error of our ways after the fact, we need a coherent approach to the identification and resolution of defects in our code and a coherent strategy for handling errors in our code as they occur.
Debugging
The process of debugging is an integral part of both the development and stabilization phases of software production.
What Is a Bug
You have probably heard errors and defects found in software referred to as bugs. This word has found its way into our everyday language and reality so that we now seem to regard the bug as normal and inevitable like death and taxes. However, not many people know how this term actually entered the language. It happened in the dim, distant technological past when computers occupied whole rooms (if not buildings). On one occasion, technicians were investigating a malfunction on such a computer. Much to their surprise, they found the cause of the circuit malfunction to be a large moth that had been attracted by the heat and glow of the machine s vacuum tubes. Over time, all computer-related errors (particularly the ones that were difficult to explain) came to be known as bugs. Sometimes we anthropomorphize bugs give them human attributes. They can seem in turn capricious and malicious, but the bugs we experience in application and database development are not related to mythological folk such as gremlins. Bugs are very real, but their causes are inevitably human. Computers bear no malice toward users or developers, compilers do not play practical jokes, and operating systems are not being stubborn when they refuse to operate as expected. No, when you encounter an error, you can be sure that it was you or another programmer who caused it. What you need to do is find the offending code and fix it, but to find bugs efficiently and painlessly, you need to establish a debugging process a formal routine with well-defined steps and rules.
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