By Darl Kuhn
Specialist Indexing in Oracle Database 11g is ready the single database constitution on the center of virtually all functionality matters: the index. Database procedure functionality is likely one of the best matters in details know-how this day. directors fight to maintain with the explosion of entry and task pushed by means of the proliferation of computing into every little thing from telephones to drugs to desktops in our more and more hooked up international. on the center of any good-performing database lies a legitimate indexing method that makes applicable use of indexing, and particularly of the vendor-specific indexing beneficial properties on provide.
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Additional info for Expert Indexing in Oracle Database 11g: Maximum Performance for Your Database
The GENDER column in Table 3-1 is an appropriate column for a bitmap index, as there are only two valid values: male and female. Table 3-1. Bitmap Index on the GENDER column of the EMPLOYEES Table Bitmap Index on GENDER Column Row Number Employee_ID Employee Name GENDER/Male GENDER/Female Bitmap Bitmap 1 107 Lorentz,Diana 0 1 2 108 Greenberg,Nancy 0 1 3 109 Faviet,Daniel 1 0 4 110 Chen,John 1 0 5 111 Sciarra,Ismael 1 0 It is also possible to create a bitmap index on the combination of several columns from the underlying table.
The advantage of this approach is that it’s very simple. If you’re experimenting in a development or test environment, this approach is quick and effective. One downside to this approach is that it doesn’t allow for a primary key to be defined on multiple columns. Here’s an example: create table cust( cust_id number ,first_name varchar2(30) ,last_name varchar2(30)); primary key In this code, Oracle creates both a primary key constraint and a corresponding unique index. Oracle automatically generates a random name like SYS_C123456 (both the constraint and index are given the same name).
Composite Bitmap Index on the GENDER and REGION columns of the EMPLOYEES Table Composite Bitmap Index on Gender and Region Columns Row Employee_ID Employee Name Gender Male Gender Female Region East Region West Region North Region South 1 107 Lorentz,Diana 0 1 1 0 0 0 2 108 Greenberg,Nancy 0 1 0 1 0 0 3 109 Faviet,Daniel 1 0 1 0 0 0 4 110 Chen,John 1 0 0 0 1 0 5 111 Sciarra,Ismael 1 0 0 1 0 0 When choosing whether or not a column is appropriate for a bitmap index, the basic rule that it should be a low cardinality column needs to be put into perspective.
Expert Indexing in Oracle Database 11g: Maximum Performance for Your Database by Darl Kuhn