Memory allocation to SAP & DB

[Former Member]

Hi Experts,

Our ECC 6.0 running with 25 GB RAM and with swap space around 90 GB. Unix & DB2 is the environment.

I am confusing about the physical memory & swap memory allocation to SAP & DB.

How to know how much physical memory is allocated to SAP & DB,

how to check OS level the allocation of RAM or swap space to SAP & DB.

We need to tune SAP buffer & memory parameters.

Best Regards,

Manoj

[Former Member]

Hello Manoj,

You can use OS level tools to check RAM and SWAP space, for example 'nmon' or 'top' (topaz) which can show the allocated amount.

If you have 'nmon' then type in 'nmon' followed by typing 'm' which will show the RAM and SWAP allocated.

The allocation you will see is only for the host, to understand how much RAM is allocated for SAP and DB you will have to check the memory parameters.

For SAP check the memory parameters like Ztta* and em*, etc., for more information look into below URL.

Functions of the SAP Memory Management System - SAP Memory Management (BC-CST-MM) - SAP Library

Please note extended memory in SAP uses SWAP space.

There are several SAP notes explaining the memory settings for DB2, similar note is mentioned below.

899322 - DB6: DB2 9.1 Standard Parameter Settings

Thanks.

Regards,

Yoganand.V

[Former Member]

Hi Yoganand,

Thanks for your nice explanation..

Can you please help me to sort out the memory concept in SAP systems,

SAP+DB on the same unix box with two disks, 14 GB RAM and 80 GB SWAP memory.

How to know the total allocation of RAM (physical memory) to SAP & DB.

Kindly let me know the procedure to calculate the total physical memory which is configured/allocated to SAP.

Best Regards,

Manoj