January 2012
Intermediate to advanced
542 pages
11h 28m
English
Content preview from Oracle Database 11gR2 Performance Tuning CookbookBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Exploring index lookup
In the previous recipe, we have seen some issues related to FTS operations and when it's better to avoid them.
One of the methods to avoid FTS is indexing. In this recipe, several issues related to index lookup and index scan will be presented along with an illustration of the counterpart for indexes of FTS operation—Index Full Scan.
Getting ready
The examples given are based on a copy of the CUSTOMERS table in the SH schema; we will use SQL*Plus to execute our tests.
How to do it...
The following steps will demonstrate index lookup:
- Connect to
SHschema:CONNECT sh@TESTDB/sh - Create the
MY_CUSTOMERStable as a copy ofCUSTOMERS:CREATE TABLE sh.MY_CUSTOMERS AS SELECT * FROM sh.CUSTOMERS NOLOGGING;
- Update the
CUST_VALIDfield ...
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