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Notice that for this to happen, User1 and User2 didn t even need to be working on the record at the exact same time They simply needed to be working on the record at about the same time I ve seen this database issue crop up time and again when GUI programmers with little or no database training are given the task of writing a database application They get a working knowledge of SELECT, INSERT, UPDATE, and DELETE and then set about writing the application When the resulting application behaves in the manner just described, it completely destroys a user s confidence in it, especially since it seems so random, so sporadic, and it is totally irreproducible in a controlled environment (leading the developer to believe it must be a user error).

During this final implementation stage, you establish exact timings for the actual switch to the new business system. You may be replacing an older system, or you may be implementing a brand-new business system. In either case, you need a checklist of the detailed steps to be undertaken to ensure a smooth transition to the new system. This checklist should also include fallback options if things don t go quite as planned. 16 discusses recovery techniques that help you restore an older database in case you need to scrap the new one for some reason. You can also run ad hoc queries at this stage to fine-tune your system and find out where any bottlenecks lie.

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This last point is the important one When working with computers, it is all about resources and their utilization If we are I/O bound and perform queries that do lots of keyed reads like I just did, a hash cluster may improve performance If we are already CPU bound, a hash cluster may possibly decrease performance since it needs more CPU horsepower to hash However, if the extra CPU we are burning is due to spinning on cache buffers chains latches, the hash cluster could significantly reduce the CPU needed This is one of the major reasons why rules of thumb do not work on real-world systems: what works for you might not work for others in similar but different conditions There is a special case of a hash cluster called a single table hash cluster.

This chapter has provided you with an introduction to the art of database design and normalization, and this information will help you when you are designing and implementing a database from scratch. However, what do you do when you walk into a company to manage its databases and you have no idea of the underlying physical data model or entity-relationship diagrams Not to worry; you can use any of the data-modeling tools discussed earlier in the chapter to reverse-engineer the underlying database model. The process of generating a logical model from an actual physical database is called reverse engineering. By using the reverse-engineering feature in a database design tool, you can quickly generate the physical model or the entity-relationship model of your database. Reverse-engineering a database can help you understand the underlying model. It can also serve to provide documentation that may be missing in situations where the DBA or the lead developer has left and nobody can find the entity-relationship diagram. Reverse-engineering diagrams can be crucial in tracking the foreign key relationships in the data model. Developers can also make good use of entity-relationship diagrams when making improvements to the application.

Many tools, such as Oracle Forms and HTML DB, transparently protect you from this behavior by ensuring the record is unchanged from the time you query it and locked before you make any changes to it, but many others (such as a handwritten Visual Basic or Java program) do not What the tools that protect you do behind the scenes, or what the developers must do themselves, is use one of two types of locking strategies: pessimistic or optimistic..

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