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This model is used to avoid storing trees more than once during query optimization, and it enables the Query Optimizer to avoid searching the same possible plan alternatives more than once as well In addition to storing equivalent alternatives, groups also store properties structures Alternatives that are rooted in the same group have equivalent logical and scalar properties Logical properties are actually called group properties in SQL Server, even when not being stored in the Memo So, every alternative in a group should all have the same output columns, key columns, possible partitionings, and so on Computing these properties is expensive, so this structure also helps to avoid unnecessary work during optimization All considered plans are stored in the Memo For large queries, the Memo may contain many thousands of groups and many alternatives within each group Combined, this represents a huge number of alternatives.

See the Finding Additional Information section later in this chapter for more information about code snippets.

Although most queries do not consume large amounts of memory during optimization, it is possible that large data warehouse queries could consume all memory on a machine during optimization If the Query Optimizer is about to run out of memory while searching the set of plans, it contains logic to pick a good enough query plan instead of running out of memory When the Query Optimizer has nished searching for a plan, it goes through the Memo, starting at the root, to select the best alternative from each group that satis es the requirements for the query These operators are assembled into the nal query plan and are then transformed into a format that can be understood by the query execution component in SQL Server.

.

This nal tree transformation does contain a small number of run-time optimization rewrites, but it is very close to the showplan output generated for the query plan An example of how the Memo works is shown during the examination of the Query Optimizer s architecture and pipeline, later in this chapter..

SQL Server 2008 has around 40 logical operators and even more physical operators. Some operators are extremely common, such as Join or Filter. Others are harder to nd, such as Segment, Sequence Project, and UDX. Operators in SQL Server 2008 follow the model seen in Figure 8-6.

2 GetRow()

5: Using Rapid Application Development Tools with Visual C# 2008

Every operator in SQL Server works by requesting rows from one or more children and then producing rows to return to the caller. The caller can be another operator or can be sent to the user if it is the uppermost operator in the query tree. Each operator returns one row at a time, meaning that the caller must call for each row. The uniformity in this design allows operators to be combined in many different ways. It allows new operators to be added to the system without major changes to the Query Optimizer, such as the property framework, that help the Query Optimizer select a query plan. To make sure that everyone gets the most of this chapter, I ll cover a few of the more rare and exotic operators so that I can reference them later in the chapter, as well as to give you an idea how your query is represented in the system.

The Compute Scalar, called a Project in the Query Optimizer, is a simple operator that attempts to declare a set of columns, compute some value, or perhaps restrict columns from other operators in the query tree. These correspond to the SELECT list in the SQL language. These are actually not overly interesting operations to the Query Optimizer there is not much that the Query Optimizer needs to do with them. The Query Optimizer ends up moving them around the query tree during optimization, trying to separate them from the rest of the Query Optimizer logic that deals with join order, index selection, and other optimizations.