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terms of resources required. And, of course, the larger the table, the more expensive a table scan becomes. Full table scans occur in the following situations: The query does not contain a WHERE clause to limit rows. None of the columns referenced in the WHERE clause matches the leading column of an index on the table. Index and table statistics have not been updated. Most RDBMS query optimizers use statistics to evaluate available indexes, and without statistics, a table scan may be seen as more ef cient than using an index. At least one column in the WHERE clause does match the rst column of an available index, but the comparison used obviates the use of an index. These cases include the following: Use of the NOT operator (for example, WHERE NOT CITY = New York ). In general, indexes can be used to nd what is in a table, but cannot be used to nd what is not in a table. Use of the NOT EQUAL operator (for example, WHERE CITY <> New York ). Use of a wildcard in the rst position of a comparison string (for example, WHERE CITY LIKE %York% ). Use of an SQL function in the comparison (for example, WHERE UPPER(CITY) = NEW YORK ). Avoid unnecessary columns. The wider the data in each row in the result set, the more disk space and memory that is required for intermediate operations such as sorts and to hold the result set. Avoid unnecessary tables. query. The fewer the tables, the more ef cient the

main() { /* This is a simple general-purpose query program. It prompts the user for a table name, and then asks the user which columns of the table are to be included in the query. After the user s selections are complete, the program runs the requested query and displays the results. */ exec sql include sqlca; exec sql include sqlda; exec sql begin declare section; char stmtbuf[2001]; char querytbl[32]; char querycol[32]; exec sql end declare section;

/* SQL text to be executed */ /* user-specified table */ /* user-specified column */

/* Cursor for system catalog query that retrieves column names */ exec sql declare tblcurs cursor for select colname from system.syscolumns where tblname = :querytbl and owner = user; exec sql declare qrycurs cursor for querystmt; /* Data structures for the program int colcount = 0; struct sqlda *qry_da; struct sqlvar *qry_var; int i; */ char inbuf[101]; /* input entered by user */ */ /* /* /* /* 1

number of columns chosen */ allocated SQLDA for query */ SQLVAR for current column */ index for SQLVAR array in SQLDA

Avoid sorts of large result sets. Sorts are expensive, especially when the rows being sorted will not t in memory. When the result set is expected to be very large, sorts should be avoided. Most optimizers will use an index if it can eliminate the need for a sort, but creating an index solely to avoid a sort of a large number of rows is probably not wise because of the overhead required to maintain the index. Match data types in predicates. Whether a predicate compares two column values as is done with joins, or a column value and a literal as is done when ltering rows, it is important for the data types to match. When

/* Prompt the user for which table to query */ printf("*** Mini-Query Program ***\n\n") printf("Enter name of table for query: "); gets(querytbl); /* Start the SELECT statement in the buffer */

In this project, we are going to collect the sun s energy from a large area, and focus it to a point in order to create localized heating. One way of collecting the sun s energy from a large area is to use mirrors. We have already explored this in the solar hot dog cooker. You will read more about concentrating solar energy in the chapter on Solar Collectors ( 8). In order to perform this experiment, we are going to need a Fresnel lens again see the chapter on Solar Collectors for an explanation on how these work. Put the marshmallow on a skewer, and rest it on the sheet of tin foil. We are going to use the Fresnel lens, to focus the sun s rays onto the marshmallow. When you look out of your window, there is no magnification or reduction of the image the glass does not act like a lens; however, you will notice when looking through the Fresnel lens (not at the sun!) the image appears much bigger and magnified. Why is this If you look closely, you will see

Figure 18-9.

18: