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This chapter finished with a look into the workings of object tables. As with nested tables, we discovered there is a lot going on under the covers with object tables in Oracle. We discussed how object views on top of relational tables can give us the functionality of an object table, while at the same time giving us easy access to the underlying relational data.

Authentication setting from the CslaAuthentication config value Data portal proxy provider setting from the CslaDataPortalProxy config value Data portal URL value for Remoting proxy from the CslaDataPortalUrl config value IsInRole provider type name from the CslaIsInRoleProvider config value Setting indicating whether objects are cloned before update through the local data portal, setting from the CslaAutoCloneOnUpdate config value Serialization provider type name from the CslaSerializationFormatter config value Setting indicating how the PropertyChanged event should be raised (different for Windows Forms or WPF), setting from the CslaPropertyChangedMode config value Value indicating whether the code is currently executing on the client or server side of the data portal

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Indexing is a crucial aspect of your application design and development Too many indexes and the performance of modifications (inserts, updates, merges, and deletes) will suffer Too few indexes and the performance of DML (including select, inserts, updates, and deletes) will suffer Finding the right mix is critical to your application s performance Frequently, I find that indexes are an afterthought in application development I believe that this is the wrong approach If you understand how the data will be used from the very beginning of the process, you should be able to come up with the representative set of indexes you will use in your application Too often the approach seems to be to throw the application out there and then see where indexes are needed.

This implies that you have not taken the time to understand how the data will be used and how many rows you will ultimately require You ll be adding indexes to this system forever as the volume of data grows over time (ie, you ll perform reactive tuning) You ll have indexes that are redundant and never used; this wastes not only space but also computing resources A few hours at the start spent properly considering when and how to index your data will save you many hours of tuning further down the road (note that I said doing so will, not might, save you many hours) The basic aim of this chapter is to give an overview of the indexes available for use in Oracle and discuss when and where you might use them.

These context values can be grouped into three areas: configuration settings, ambient values, and context dictionaries.

This chapter differs from others in this book in terms of its style and format Indexing is a huge topic you could write an entire book on the subject in part because indexing bridges the developer and DBA roles The developer must be aware of indexes, how indexes apply to their applications, when to use indexes (and when not to use them), and so on The DBA is concerned with the growth of an index, the use of storage within an index, and other physical properties We will be tackling indexes mainly from the standpoint of their practical use in applications The first half of this chapter conveys the basic knowledge I believe you need to make intelligent choices about when to index and what type of index to use The second half of the chapter answers some of the most frequently asked questions about indexes.

The various examples in this chapter require different feature releases of Oracle When a specific example requires features found in Oracle Enterprise or Personal Edition but not Standard Edition, I ll specify that..

The configuration settings include items read from the config file. This is done using the standard .NET System.Configuration.ConfigurationManager class. In this case, ApplicationContext is simply wrapping existing functionality to provide a more abstract way to access the config values.

Oracle provides many different types of indexes for us to use. Briefly, they are as follows: B*Tree indexes: These are what I refer to as conventional indexes. They are, by far, the most common indexes in use in Oracle and most other databases. Similar in construct to a binary tree, B*Tree indexes provide fast access, by key, to an individual row or range of rows, normally requiring few reads to find the correct row. It is important to note, however, that the B in B*Tree does not stand for

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