How To Fix DB02120 - optimizer_mode. Controls optimizer behavior. Default: <>Choose.

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 120

• Message text: optimizer_mode. Controls optimizer behavior. Default: <>Choose.

Self-Explanatory Message

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To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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Smart SAP Assistant

• What is the cause and solution for SAP error message DB02120 - optimizer_mode. Controls optimizer behavior. Default: <>Choose. ?

  The SAP error message DB02120 relates to the database optimizer mode setting, which controls how the database optimizer behaves when executing SQL queries. This error typically indicates that there is an issue with the configuration of the optimizer mode in the database settings.
  Cause:
  
  Incorrect Optimizer Mode Setting: The optimizer mode may not be set correctly in the database configuration. This can happen if the setting is left blank or if an invalid value is provided.
  Database Compatibility: The optimizer mode may not be compatible with the version of the database you are using.
  Database Configuration Changes: Changes made to the database configuration without proper validation can lead to this error.
  
  Solution:
  
  
  Check Current Optimizer Mode: Use the database management tools or SQL commands to check the current optimizer mode setting. For example, in Oracle, you can query the OPTIMIZER_MODE parameter.
  SELECT value FROM v$parameter WHERE name = 'optimizer_mode';
  
  
  Set the Optimizer Mode: If the optimizer mode is not set or is set incorrectly, you can change it to a valid value. Common values include:
  
  ALL_ROWS: Optimizes for overall throughput.
  FIRST_ROWS: Optimizes for the fastest retrieval of the first row.
  CHOOSE: The optimizer decides based on the statistics available.
  
  To set the optimizer mode, you can use a command like:
  ALTER SYSTEM SET optimizer_mode = 'ALL_ROWS' SCOPE=BOTH;
  
  
  Review Database Documentation: Check the documentation for your specific database version to ensure that you are using the correct values for the optimizer mode.
  
  
  Restart Database: In some cases, changes to the optimizer mode may require a restart of the database for the changes to take effect.
  
  
  Consult SAP Notes: Look for any relevant SAP Notes or documentation that may provide additional guidance or specific instructions related to your version of SAP and the database you are using.
  
  
  Related Information:
  
  Database Documentation: Refer to the official documentation for your specific database (e.g., Oracle, SQL Server, etc.) for detailed information on optimizer modes and their implications.
  SAP Basis Administration: If you are not familiar with database settings, consult with your SAP Basis administrator or database administrator for assistance.
  Performance Tuning: Understanding how different optimizer modes affect query performance can be crucial for optimizing your SAP system's performance.
  
  By following these steps, you should be able to resolve the DB02120 error and ensure that the optimizer mode is set correctly for your database environment.