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Extra resources for Compactness of a nonlinear eigenvalue problem with a singular nonlinearity
40 Chapter 3 SQL Processing A matching predicate, by deﬁnition, participates in deﬁning the slice; where to enter, where to exit. The number of index rows is the same as the number of table rows, with the exception that Oracle does not create index rows for NULL values. 7 is used. 1% of the whole index. Columns MAKE and MODEL are matching columns. 3, although it is far from being the best possible index; at least the index slice to be scanned is rather thin. 4 because we have only one matching column.
Remember that the glossary provided at the end of the book summarizes all the terms used throughout this chapter. Relational Database Index Design and the Optimizers, by Tapio Lahdenm¨aki and Michael Leach Copyright 2005 John Wiley & Sons, Inc. 29 30 Chapter 3 SQL Processing PREDICATES A WHERE clause consists of one or more predicates (search arguments). 1. 1 WHERE SEX = ‘M’ AND (WEIGHT > 90 OR HEIGHT > 190) ž SEX = ‘M’ ž WEIGHT > 90 ž HEIGHT > 190 They can also be considered as two compound predicates: ž WEIGHT > 90 OR HEIGHT > 190 ž SEX = ‘M’ AND (WEIGHT > 90 OR HEIGHT > 190) Predicates are the primary starting points for index design.
The table is then somewhat redundant. 24 Chapter 2 Table and Index Organization Some DBMSs have the option of avoiding the need for the table. The leaf pages of one of the indexes then effectively contain the table rows. In Oracle, this option is called an index-organized table, and the index containing the table rows is called the primary index. In SQL Server, the table rows are stored in an index created with the option CLUSTERED. In both cases, the other indexes (called secondary indexes in Oracle and unclustered indexes in SQL Server) point to the index that contains the table rows.