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For example, if the statistics change so that a different plan would work better, the query processor can t use this information because you ve told it how to accomplish the query You ve changed SQL from a declarative language to an imperative language It s best not to put query hints in code, but separate them to a separate layer SQL Server 2005 calls this separate layer plan guides The plan guide is a named database object that relates a hint to a query without changing the underlying code You can add and drop plan guides, turn them on and off at will, or re-evaluate them when things (the statistics or use cases) change Can you use plan guides with LINQ to SQL or EF queries There are two things to keep in mind.

fo = 0159/(LC )1/2 900 = 0159/(L 0000033)1/2 9002 = 01592/(0000033 L) 810 = 00253/(0000033 L)

First, a plan guide for a SQL statement requires an exact match on a batch-by-batch basis Machine-generated SQL will likely make an exact match easier, but you will have to check that the guides are being used each time LINQ/EF libraries change Second, plan guides work best if you have a limited number in your database They re meant to be special-case, not to add another level of complexity to a situation that is complex and becomes more complex as the layers of abstraction increase Therefore, although you can use plan guides, use them with care Is this issue worth worrying about I think we ll need to wait and see Will you fix a few bad SQL or bad query problems in LINQ/EF before giving up entirely, or fix performance problems in the generated SQL by going to stored procedures.

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Summary

Problem 17-13 Suppose a circuit must be designed to have fo = 455 kHz A coil of 100 H is available What size capacitor is needed Convert the frequency to megahertz: 455 kHz = 0455 MHz Then the calculation proceeds in the same way as with the preceding problem:

To delete an album, use the remove command This gets rid of the album but leaves the photos it contains in iPhoto, just as when you delete an album when working interactively For example, the following statement deletes the album named Lombard Stunts:

New database APIs that promise to abstract the programming model away from the underlying database model and its declarative SQL language are always exciting to programmers who want to concentrate on presentation, use cases, and business logic, and spend less time with database optimization. LINQ to SQL and EF (as well as other object-relational mappers) show promise in this area but the proof is in the efficiency of the generated code and the size and reuse potential of the plan cache that results. Should folks be waiting in anticipation of LINQ to SQL/EF related performance problems I m not the only one who thinks optimizing declarative languages will always have its place; we ve seen much written already in books and blogs about the right and wrong way to use LINQ to SQL and the ADO.NET Entity Framework. This chapter should provide you with hints and concerns from a database performance perspective.

Before I get started, let s define a few terms to make sure we re all on the same page. When I refer to SQL Server, I mean all versions of Microsoft SQL Server except SQL Server Compact edition. The connection techniques I discuss here apply to virtually all versions of SQL Server, starting with SQL Server 2000 and extending beyond SQL Server 2008. If I need to discuss a version-specific issue, I ll indicate the

fo = 0159/(LC )1/2 0455 = 0159/(100 C )1/2 04552 = 01592/(100 C ) 0207 = 00253/(100 C ) 0207 100 C = 00253 207 C = 00253 C = 00253/207 = 000122 F = 1220 pF In practical circuits, variable inductors and/or variable capacitors are often placed in tuned circuits, so that small errors in the frequency can be compensated for The most common approach is to design the circuit for a frequency slightly higher than fo, and to use a padder capacitor in parallel with the main capacitor (Fig 17-13)

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