Hello Alex,
It looks like you did the parameter check correctly. Are you sure that the files are located in your current directory and that you can write into the -o directory.
But notice the parameter check does not give any recommendation related to the Parameter Cache_Size.
If you get worse cache hitrate during batch processing in the night, it really sounds that there are missing indexes for the batch jobs. So the system has to read much more data to get the qualified records. I would first check the ressource monitor - Do you get information about long running SQL.
Additionally you can use transaction ST06/st03 to get the most expensive batch jobs.
And of course you can start Command monitor during night - but please don't forget to stop it in the morning, Otherwise it overwrites you logged commands.
Please check as well the Expert Sesion about the performance monitoring tools:
http://maxdb.sap.com/training/
- Session 4: Performance Optimization with SAP MaxDB
- Session 16: SAP MaxDB SQL Query Optimization (Part 1)
- Session 16: SAP MaxDB SQL Query Optimization (Part 2)
- Session 22: SAP MaxDB Database Analyzer
Regards, Christiane
