Slow Query Using Pipeline Function TABLE with Plan 'COLLECTION ITERATOR PICKLER FETCH'
(Doc ID 2224317.1)
Last updated on MARCH 03, 2022
Applies to:
Oracle Database - Enterprise Edition - Version 9.2.0.8 to 12.1.0.2 [Release 9.2 to 12.1]Gen 1 Exadata Cloud at Customer (Oracle Exadata Database 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
Oracle Database Backup Service - Version N/A and later
Information in this document applies to any platform.
Symptoms
- Slow running query using pipeline functions like TABLE() function
- Following example statement shows cardinality misestimates on pickler fetch operations:
Changes
Statement is using pipeline function TABLE(). Statistics are not considered when using pipeline function.
Cause
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In this Document
| Symptoms |
| Changes |
| Cause |
| Solution |
| References |