How To Fix DB02126 - Snapshot too old. ORA-1555.

DB02126 - Overview

• Message type: E = Error

• Message class: DB02 - For Oracle Component of the Database Monitor

• Message number: 126

• Message text: Snapshot too old. ORA-1555.

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message DB02126 - Snapshot too old. ORA-1555. ?

  The error message "DB02126 Snapshot too old. ORA-1555" is an Oracle database error that indicates a problem with the undo data required to construct a consistent read view of the data. This typically occurs in environments with high transaction rates where the undo data is overwritten before it can be used to satisfy a query.
  
  Cause:
  The ORA-1555 error occurs when:
  
  Long-Running Queries: A query is running for a long time and tries to access data that has been modified and the corresponding undo data has already been overwritten.
  Insufficient Undo Tablespace: The undo tablespace is too small to hold all the undo data needed for concurrent transactions and long-running queries.
  High Transaction Volume: A high volume of DML (Data Manipulation Language) operations can lead to rapid consumption of undo space.
  Improper Undo Retention Settings: The undo retention period is set too low, causing the database to overwrite undo data before it is needed.
  
  
  Solution:
  To resolve the