How To Fix DB6109 - The catalog cache hit ratio is too low

DB6109 - Overview

• Message type: E = Error

• Message class: DB6 - DB6: Alert Monitoring and Alert Configuration

• Message number: 109

• Message text: The catalog cache hit ratio is too low

What causes this issue?

Too high a proportion of the requested description data for tables from
the DB2 system catalog is not being read using the catalog cache, but
must be read from the database.

System Response

If the hitrate here is low, you should also consider the number of
overflows in the catalog cache. If overflows do in fact occur, this has
an impact on performance.

How to fix this error?

Increase the size of the catalog cache using:
<LB>UPDATE DATABASE CONFIGURATION FOR <SID> USING CATALOGCACHE_SZ
<Value></>
Note that the increased demand for virtual memory causes more paging,
if there is not enough real main memory available.

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.

DB6109 - Details

• The SAP error message DB6109 indicates that the catalog cache hit ratio is too low, which can lead to performance issues in the database. This message typically arises in the context of database performance monitoring and optimization.
  
  Cause:
  The catalog cache is used by the database to store metadata about database objects (like tables, indexes, etc.) to speed up access to this information. A low catalog cache hit ratio suggests that the database is frequently needing to access the disk to retrieve this metadata instead of being able to retrieve it from the cache. This can be caused by several factors:
  
  Insufficient Cache Size: The cache may not be large enough to hold all the necessary metadata, leading to frequent cache misses.
  High Metadata Activity: If there are many changes to the database schema or a high number of database objects, the cache may be unable to keep up.
  Database Configuration: Incorrect configuration settings for