My Oracle Support Banner

Ora-01555 Caused By SELECT Statements With Low Query Duration and no Concurrent DML (Doc ID 361992.1)

Last updated on JANUARY 27, 2023

Applies to:

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


Many ORA-1555 occur while performing only SELECT statements within the reporting database: ORA-1555 with small query duration in the message :

     ORA-01555 caused by SQL statement below (Query Duration=9 sec, SCN: 0x0001.8be5c8d1):


The PRODUCTION database is copied every night with its UNDO tablespace and renamed to REPORTING for reporting purposes .


To view full details, sign in with your My Oracle Support account.

Don't have a My Oracle Support account? Click to get started!

In this Document

My Oracle Support provides customers with access to over a million knowledge articles and a vibrant support community of peers and Oracle experts.