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Potentially Expensive Query Operations (Doc ID 162142.1)

Last updated on DECEMBER 14, 2020

Applies to:

Oracle Database - Enterprise Edition
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Cloud Exadata Service - Version N/A and later
Information in this document applies to any platform.
Information in this document applies to any platform.

Purpose

This article aims to highlight potential problem areas in queries.

It covers areas where a number of factors may adversely affect query performance and suggest methods of alleviating problems with this. It also discusses high cost operations.

This article applies to both the Rule (RBO) and Cost Based Optimizers (CBO) although the terms used (cardinality & cost) apply more to the CBO.

Troubleshooting Steps

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In this Document
Purpose
Troubleshooting Steps
 Potentially Expensive Query Operations
References

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