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N OTE : The exact syntax will vary from one DBMS to another. For example, the SQL standard speci es the keyword FOR, but the Oracle syntax uses the keyword IS, and the Microsoft SQL Server syntax makes the keyword optional. Also, Oracle requires the keyword CURSOR to appear before the cursor name instead of after it. As usual, consult your DBMS documentation for details. The DECLARE CURSOR statement only de nes the cursor no data is selected until the cursor is subsequently opened and used. This is very much

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It explores various ways to carry out the statement Can an index be used to speed a search Should the DBMS first apply a search condition to Table A and then join it to Table B, or should it begin with the join and use the search condition afterward Can a sequential search through a table be avoided or reduced to a subset of the table After exploring alternatives, the DBMS chooses one of them 4 The DBMS then generates an application plan for the statement The application plan is a binary representation of the steps that are required to carry out the statement; it is the DBMS equivalent of executable code 5 Finally, the DBMS carries out the statement by executing the application plan Note that the steps in Figure 17-1 vary in the amount of database access they require and the amount of CPU time they take.

Parsing a SQL statement does not require access.

17:

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to the database and typically can be done very quickly. Optimization, on the other hand, is a very CPU-intensive process and requires access to the database s system catalog. For a complex, multitable query, the optimizer may explore more than a dozen different ways of carrying out the query. However, the cost in computer processing time of doing the query the wrong way is usually so high compared to the cost of doing it the right way (or at least a better way) that the time spent in optimization is more than gained back in increased query execution speed. When you type a SQL statement to interactive SQL, the DBMS goes through all five steps while you wait for its response. The DBMS has little choice in the matter it doesn t know which statement you are going to type until you type it, so none of the processing can be done ahead of time. In programmatic SQL, however, the situation is quite different. Some of the early steps can be done at compile-time, when the programmer is developing the program. This leaves only the later steps to be done at runtime, when the program is executed by a user. When you use programmatic SQL, all DBMS products try to move as much processing as possible to compile-time, because once the final version of the program is developed, it may be executed thousands of times by users in a production application. In particular, the goal is to move optimization to compile-time if at all possible.

like de ning a le in a traditional programming language nothing really happens until the le is opened and used. The cursor_name must be unique within the program and will be used to reference the declared cursor in subsequent statements. The SQL statement included in the cursor declaration can contain most SELECT statement clauses. However, the INTO clause may not be included here because it is used in the FETCH statement as shown later in this section. The FOR UPDATE clause is optional, but some SQL implementations require it if subsequent SQL statements update and/or delete data selected by the cursor. As usual, consult your RDBMS documentation for speci cs. Here is an example of a DECLARE CURSOR statement written in Oracle syntax. It selects movie rentals that are currently overdue.

Figure 17-1.

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