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First, let s look at the NOCOMPRESS option This option is different in implementation from the table compression discussed above It works for any operation on the index organized table (as opposed to the table compression which may or may not be in effect for conventional path operations) Using NOCOMPRESS, it tells Oracle to store each and every value in an index entry (ie, do not compress) If the primary key of the object were on columns A, B, and C, every occurrence of A, B, and C would physically be stored The converse to NOCOMPRESS is COMPRESS N, where N is an integer that represents the number of columns to compress This removes repeating values and factors them out at the block level, so that the values of A and perhaps B that repeat over and over are no longer physically stored.

ElementType and Expression both have reasonably simple implementations. In CSLA .NET, ElementType simply returns an instance of the child type as follows: Public ReadOnly Property ElementType() As Type Get Return GetType(C) End Get End Property The Expression property is also fairly simple. It returns the expression tree associated with the collection (I ll cover expression trees in the next section). In BusinessListBase, this represents the entire collection, because you use LinqBindingList rather than BusinessListBase to represent the result of a query. In BusinessListBase, Expression returns a private backing field where the current expression is held. Public ReadOnly Property Expression() As Expression Get If _expression Is Nothing Then _expression = Expression.Constant(Me) End If Return _expression End Get End Property

Consider, for example, a table created like this: ops$tkyte%ORA11GR2> create table iot 2 ( owner, object_type, object_name, 3 primary key(owner,object_type,object_name) 4 ) 5 organization index 6 NOCOMPRESS.

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/ Table created. It you think about it, the value of OWNER is repeated many hundreds of times. Each schema (OWNER) tends to own lots of objects. Even the value pair of OWNER,OBJECT_TYPE repeats many times, so a given schema will have dozens of tables, dozens of packages, and so on. Only all three columns together do not repeat. We can have Oracle suppress these repeating values. Instead of having an index block with values shown in Table 10-1, we could use COMPRESS 2 (factor out the leading two columns) and have a block with the values shown in Table 10-2. Table 10-1. Index Leaf Block, NOCOMPRESS Sys,table,t1 Sys,table,t5 Sys,table,t100 Sys,table,t2 Sys,table,t6 Sys,table,t101 Sys,table,t3 Sys,table,t7 Sys,table,t102 Sys,table,t4 Sys,table,t8 Sys,table,t103

The last member in any IQueryable implementation is the Provider property. The Provider is where the core of any IQueryable implementation really occurs. The property itself is fairly simple, returning a new instance of the CslaQueryProvider: Public ReadOnly Property Provider() As IQueryProvider Get Return New Linq.CslaQueryProvider(Of T, C)(Me) End Get End Property CslaQueryProvider is the CSLA .NET implementation of the IQueryProvider interface, which defines a custom implementation of LINQ. Of course, the devil is in the details, and understanding how an IQueryProvider works is key to understanding what LINQ to CSLA .NET is doing behind the scenes.

Table 10-2. Index Leaf Block, COMPRESS 2 Sys,table t4 t300 t1 t5 t103 t301 t2 t104 t302 t3 t303

That is, the values SYS and TABLE appear once, and then the third column is stored. In this fashion, we can get many more entries per index block than we could otherwise. This does not decrease concurrency we are still operating at the row level in all cases or functionality at all. It may use slightly more CPU horsepower, as Oracle has to do more work to put together the keys again. On the other hand, it may significantly reduce I/O and allow more data to be cached in the buffer cache, since we get more data per block. That is a pretty good tradeoff. Let s demonstrate the savings by doing a quick test of the preceding CREATE TABLE as SELECT with NOCOMPRESS, COMPRESS 1, and COMPRESS 2. We ll start by creating our IOT without compression: ops$tkyte%ORA11GR2> create table iot 2 ( owner, object_type, object_name, 3 constraint iot_pk primary key(owner,object_type,object_name) 4 ) 5 organization index 6 NOCOMPRESS 7 as 8 select distinct owner, object_type, object_name

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