How To Fix HH055 - Informix 'read ahead' feature seems to be switched off

HH055 - Overview

• Message type: E = Error

• Message class: HH - (Long) text for check tool 'infcfgcheck'

• Message number: 055

• Message text: Informix 'read ahead' feature seems to be switched off

What causes this issue?

This message is not an error!
The quality of the Informix feature 'Read ahead' could not be
determined since this feature seems to be switched off
on your system.

System Response

How to fix this error?

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message HH055 - Informix 'read ahead' feature seems to be switched off ?

  The SAP error message HH055 indicates that the 'read ahead' feature for Informix is turned off. This feature is important for optimizing database performance, as it allows the database to pre-fetch data pages into memory, reducing the number of disk I/O operations and improving response times for queries.
  
  Cause:
  The error can occur due to several reasons:
  
  Configuration Settings: The Informix database may not have the 'read ahead' feature enabled in its configuration settings.
  Database Version: Certain versions of Informix may have different default settings or may not support the 'read ahead' feature.
  Resource Limitations: If the system is under heavy load or if there are resource constraints, the database may disable certain features to maintain stability.
  
  
  Solution:
  To resolve the HH055 error, you can take the following steps:
  
  
  Check Configuration:
  
  Verify the Informix configuration settings. You can check the ONCONFIG file for the READAHEAD parameter. It should be set to a value greater than 0 to enable the