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sion that de nes the view1 Most compiler texts cover parsing (see the bibliographical notes) Given a query, there are generally a variety of methods for computing the answer For example, we have seen that, in SQL, a query could be expressed in several different ways Each SQL query can itself be translated into a relational-algebra expression in one of several ways Furthermore, the relational-algebra representation of a query speci es only partially how to evaluate a query; there are usually several ways to evaluate relational-algebra expressions As an illustration, consider the query select balance from account where balance < 2500 This query can be translated into either of the following relational-algebra expressions: balance<2500 ( balance (account)) balance ( balance<2500 (account)) Further, we can execute each relational-algebra operation by one of several different algorithms For example, to implement the preceding selection, we can search every tuple in account to nd tuples with balance less than 2500 If a B+ -tree index is available on the attribute balance, we can use the index instead to locate the tuples To specify fully how to evaluate a query, we need not only to provide the relationalalgebra expression, but also to annotate it with instructions specifying how to eval1 For materialized views, the expression de ning the view has already been evaluated and stored Therefore, the stored relation can be used, instead of uses of the view being replaced by the expression de ning the view Recursive views are handled differently, via a xed-point procedure, as discussed in Section 526 .net pdf 417 PDF - 417 C# Control - PDF - 417 barcode generator with free C# ...
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NET PDF-417 Generator SDK Tutorial tells users how to generate 2D PDF-417 Barcodes in .NET Framework with C# class. uate each operation Annotations may state the algorithm to be used for a speci c operation, or the particular index or indices to use A relational-algebra operation annotated with instructions on how to evaluate it is called an evaluation primitive A sequence of primitive operations that can be used to evaluate a query is a queryexecution plan or query-evaluation plan Figure 132 illustrates an evaluation plan for our example query, in which a particular index (denoted in the gure as index 1 ) is speci ed for the selection operation The query-execution engine takes a query-evaluation plan, executes that plan, and returns the answers to the query The different evaluation plans for a given query can have different costs We do not expect users to write their queries in a way that suggests the most ef cient evaluation plan Rather, it is the responsibility of the system to construct a query-evaluation plan that minimizes the cost of query evaluation 14 describes query optimization in detail Once the query plan is chosen, the query is evaluated with that plan, and the result of the query is output The sequence of steps already described for processing a query is representative; not all databases exactly follow those steps For instance, instead of using the relational-algebra representation, several databases use an annotated parse-tree representation based on the structure of the given SQL query However, the concepts that we describe here form the basis of query processing in databases In order to optimize a query, a query optimizer must know the cost of each operation Although the exact cost is hard to compute, since it depends on many parameters such as actual memory available to the operation, it is possible to get a rough estimate of execution cost for each operation Section 132 outlines how we measure the cost of a query Sections 133 through 136 cover the evaluation of individual relational-algebra operations Several operations may be grouped together into a pipeline, in which each of the operations starts working on its input tuples even as they are being generated by another operation In Section 137, we examine how to coordinate the execution of multiple operations in a query evaluation plan, in particular, how to use pipelined operations to avoid writing intermediate results to disk. .net pdf 417 Best 20 NuGet pdf417 Packages - NuGet Must Haves Package
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