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In a hash cluster, this query would result in a full table scan unless you had an index on the DEPTNO column Only exact equality searches (including IN lists and subqueries) may be made on the hash key without using an index that supports range scans In a perfect world, with nicely distributed hash key values and a hash function that distributes them evenly over all of the blocks allocated to the hash cluster, we can go straight from a query to the data with one I/O In the real world, we will end up with more hash key values hashing to the same database block address than fit on that block This will result in Oracle having to chain blocks together in a linked list to hold all of the rows that hash to this block.

CHAPTER 2 NETWORK ADMINISTRATION AND IT TRENDS THROUGHOUT HISTORY!

Now, when we need to retrieve the rows that match our hash key, we might have to visit more than one block Like a hash table in a programming language, hash tables in the database have a fixed size When you create the table, you must determine the number of hash keys your table will have, forever That does not limit the amount of rows you can put in there In Figure 10-9, we can see a graphical representation of a hash cluster with table EMP created in it When the client issues a query that uses the hash cluster key in the predicate, Oracle will apply the hash function to determine which block the data should be in It will then read that one block to find the data.

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This technique that CSLA .NET uses to match the Expression to the correct implementation using the MethodsEquivalent() function should continue to work even in the event that Microsoft adds more extension methods to IEnumerable(Of T) and implements them in the static Enumerable class. However, if Microsoft were to update the class name that holds the LINQ to Objects extension methods, a change to CSLA .NET would be required to support it.

If there have been many collisions, or the SIZE parameter to the CREATE CLUSTER was underestimated, Oracle will have allocated overflow blocks that are chained off the original block..

Figure 10-9 Depiction of a hash cluster When you create a hash cluster, you ll use the same CREATE CLUSTER statement you used to create the index cluster with different options You ll just be adding a HASHKEYS option to it to specify the size of the hash table Oracle will take your HASHKEYS value and round it up to the nearest prime number; the number of hash keys will always be a prime Oracle will then compute a value based on the SIZE parameter multiplied by the modified HASHKEYS value It will allocate at least that much space in bytes for the cluster This is a big difference from the preceding index cluster, which dynamically allocates space as it needs it A hash cluster pre-allocates enough space to hold (HASHKEYS/trunc(blocksize/SIZE)) bytes of data.

For example, if you set your SIZE to 1,500 bytes and you have a 4KB block size, Oracle will expect to store two keys per block If you plan on having 1,000 HASHKEYs, Oracle will allocate 500 blocks It is interesting to note that unlike a conventional hash table in a computer language, it is OK to have hash collisions in fact, it is desirable in many cases If you take the same DEPT/EMP example from earlier, you could set up a hash cluster based on the DEPTNO column Obviously, many rows will hash to the same value, and you expect them to (they have the same DEPTNO) This is what the cluster is about in some respects: clustering like data together.

The LinqBindingList(Of C) holds the details of the query generated by it (the expression and the IQueryProvider) and a reference to the parent list so that changes, additions, and deletions in LinqBindingList(Of C) can be propagated to the parent list and, in turn, to other instances of LinqBindingList(Of C) that are derived from the same source. LinqBindingList(Of C) itself implements the IQueryable(Of T) interface, allowing for subqueries against it that generate further LinqBindingList(Of C) instances. These subsequent LinqBindingList(Of C) instances are not children of the source LinqBindingList(Of C). Rather, they all have the same relationship to the original BusinessListBase(Of T, C).

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