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ORA-4031 and DBMS_SHARED_POOL.KEEP remarks and PIND toolkit overview (Doc ID 311689.1)

Last updated on JUNE 30, 2023

Applies to:

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


This article contains information about DBMS_SHARED_POOL.KEEP (Keeping) which can help when dealing with ORA-4031.
Anyway we recommend firstly to follow documents:
<Note 62143.1> - Understanding and Tuning the Shared Pool
<Note 146599.1> - Diagnosing and Resolving Error ORA-04031
and try to reduce pressure put on Library Cache.

It also intends to give some information on PIND toolkit which helps to resolve some ORA-4031 problems.
PIND toolkit itself is available in Published (Limited) Note 301171.1 - Toolkit for dynamic marking of Library Cache objects as Kept (PIND)


This document is intended for DBAs.


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In this Document
 A. General comments
 0.Pin vs Keep
 1.Contiguous allocations
 2.Bootstrap keeping
 3.User kept types
 4.Cursor specifics
 6.ORA-4031 and Kept objects
 7.KEPT object is reloaded
 8.Timing of keeping
 B. PIND toolkit:

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