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However, a column such as gender that only has two distinct values (M and F) has very poor selectivity (002 in this case) Unique indexes always have a selectivity ratio of 10, which is the best possible A good rule of thumb is to avoid indexes with a selectivity of less than 033 unless they are indexes especially designed for low selectivity such as bit-map indexes Foreign key indexes improve joins With most optimizers, an index on a foreign key column greatly improves join performance, and it can enable additional join methods for the optimizer to use Index columns frequently used in predicates For large tables, every query should contain a WHERE predicate that references an indexed column Therefore, it is best to nd the columns that are most frequently referenced by predicates and to index them Don t overindex.

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Data Type CHAR VARCHAR LONG VARCHAR SMALLINT INTEGER FLOAT DECIMAL DATE TIME TIMESTAMP GRAPHIC VARGRAPHIC Table 18-1.

A complication of using the DESCRIBE statement is that your program may not know in advance how many columns of query results there will be, and therefore, it may not know how large a SQLDA must be allocated to receive the description One of three strategies is typically used to ensure that the SQLDA has enough space for the returned descriptions I If the program has generated the select list of the query, it can keep a running count of the select items as it generates them In this case, the program can allocate a SQLDA with exactly the right number of SQLVAR structures to receive the column descriptions This approach was used in the program shown in Figure 18-9.

I If it is inconvenient for the program to count the number of select list items, it can initially DESCRIBE the dynamic query into a minimal SQLDA with a one-element SQLVAR array When the DESCRIBE statement returns, the SQLD value tells the program how large the SQLDA must be The program can then allocate a SQLDA of the correct size and reexecute the DESCRIBE statement, specifying the new SQLDA There is no limit to the number of times that a prepared statement can be described I Alternatively, the program can allocate a SQLDA with a SQLVAR array large enough to accommodate a typical query A DESCRIBE statement using this SQLDA will succeed most of the time.

As a rule of thumb, don t create more than three or four indexes for any table As already stated, indexes take up storage and must be maintained Too many indexes on a table can cripple the performance of an INSERT or UPDATE issued against that table Avoid overlapping indexes Nearly every RDBMS can use an index even when the WHERE predicate references only the rst column of the index Therefore, overlapping indexes (those that have the same leading column) are redundant and unnecessary Consider unique indexes With some RDBMSs, such as DB2, unique indexes are so superior that DBAs often add otherwise unnecessary columns to an index just to make it unique Drop indexes for bulk loads For mass loads of data into a table, consider dropping some of the indexes and re-creating them after the load is complete.

If the SQLDA turns out to be too small for the query, the SQLD value tells the program how large the SQLDA must be, and it can allocate a larger one and DESCRIBE the statement again into that SQLDA The DESCRIBE statement is normally used for dynamic queries, but you can ask the DBMS to DESCRIBE any previously prepared statement This feature is useful, for example, if a program needs to process an unknown SQL statement typed by a user The program can PREPARE and DESCRIBE the statement and examine the SQLD field in the SQLDA If the SQLD field is zero, the statement text was not a query, and the EXECUTE statement can be used to execute it If the SQLD field is positive, the statement text was a query, and the OPEN/FETCH/CLOSE statement sequence must be used to execute it..