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Oracle Data Warehouse Tuning for 10g
book

Oracle Data Warehouse Tuning for 10g

by Gavin JT Powell
April 2011
Intermediate to advanced content levelIntermediate to advanced
504 pages
16h 49m
English
Digital Press
Content preview from Oracle Data Warehouse Tuning for 10g
7.2 How Oracle SQL Is Executed 189
Chapter 7
Influence the Optimizer
ALL_ROWS. Suppresses indexes and favors full table scans to find all
rows.
FIRST_ROWS(n). More likely to use indexing, because the query
plan should assume that only the first n rows for a query will be
retrieved.
CPU_COSTING. Default mode, persuades the optimizer to esti-
mate query execution time based on CPU cycles and I/O activity.
This hint fills a column in the PLAN_TABLE called CPU_COST,
based on CPU cycles and I/O operations.
NO_CPU_COSTING. Ignores CPU cycles, basing query execution
time estimation on I/O activity only.
CURSOR_SHARING_EXACT. Overrides behavior of configura- ...
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Publisher Resources

ISBN: 9781555583354