Extended memory problem...

[Former Member]

Hi,

It 4.6C/AIX/Oracle.

I am having problem with our extended memory.

On one of our App. Server, When I go to ST02, HitRatio column for Extended Memory line is 95% and it is displayed in red color. The Max.Use and In Memory column are almost equal. It looks to me that it is using all of the extended memory. It happens all the time on this server. Rest of the server are OK.

I double click the Extended Memory line and choose current parameters button. Some parameters are as follows -

em/initial_size_MB 2000 MB

em/blocksize_KB 1024 kB

em/address_space_MB 512 MB

ztta/roll_extension 360000000 Byte

abap/heap_area_dia 900000000 Byte

abap/heap_area_nondia 900000000 Byte

abap/heap_area_total 2000000000 Byte

abap/heaplimit 20000000 Byte

abap/use_paging 0

I want to increase the extended memory. Which parameter needs to be increased and what should I consider before increasing it.

I need your help. It is causing lot of issues. If there is any note on this then please let me knwo.

I will aprreciate your help.

Thanks.

[Former Member]

Thanks for reply. I am going to look into your advice. Hope it will be helpful. I found few notes as well and they seem to be very helpful.

I will send you an mail if required.

Thanks

[Former Member]

Hi,

I assume you are running 64-bit SAP on a unix operating system. If this is true, em/initial_size_MB is not only the initial size but also the total size of extended memory. Increase the value of this parameter, e.g. to 3 or 4 GB. This will require additional swap swace. Be sure that swap space never gets short as this may cause serious problems not only for the SAP SW but for all SW on this box.

Extended memory is highly platform dependent. Other platforms require different parameter changes. If my recommendation does not meet your expectations, please send info about configuration and complete instance profile to gz@sap.com

Good luck,

Guenter Zachmann