SWAP - ST02

[Former Member]

Hi Gurus, I am doing daily monitoring for a server. Right in ST02 t-code i have some issue which i dont know how to resolve it.

One of the buffer which is Table Definition buffer directory is getting filled and increase day by day.

Buffer HitRatio % Alloc. KB Freesp. KB % Free Sp. Dir. Size FreeDirEnt % Free Dir Swaps DB Accs

Table definition 99.69 4,924 8 0.21 20,000 40 0.20 0 0 74,946

Day by day the directory size is just keep increasing. I dont have confident to tune-up the parameter setting in Production system. Even when i checked the Program buffer free directory size is 0.40% at the moment. I also have monitor that occuring in the program buffer day by day. From yesterday until today the swap that was occured was 24560 swaps. So i need your guideline what to do next in regards to this. I would sincerely appreciate your kind guidance and help.

Thank You.

[Former Member · Accepted solution]

HI Gurus, The server been restarted on 10.04.2009. Do we still need to restarted the server again ?? !! As for the moment there is no complaint from the user regarding performance issue because only around 40 end user working on that server. But however still the Table Definition buffer should not get filled to the max until swaps start occurring now. I'm not sure about configuring the profile parameter to increase the buffer setting. Please provide guideline. Thank you.

[Former Member · Accepted solution]

Hi,

There is no formula to increase the size of the buffer. You need to increase it by say 20-25 % at a time & monitor it.

Check below link, it will help you.

Thanks

Sushil

[Former Member · Accepted solution]

When was the last time you bounced sap ? If it was long back having high swap is normal . Also you hitratio of above 99% is fairly good . Was any major activity taking place in the system ( The functionla team might have executed some reports ) when you noticed the high swap ?

[JPReyes]

You might want to try increase the size of rsdb/ntab/entrycount as far as I can see you're using the default value of 20000.

Regards

Juan

[Former Member]

From yesterday until today the swap that was occured was 24560 swaps.

You need to tune the buffer. It seems to be high figure. Are you finding performance problems?

[Former Member]

Hi Ram,

If possible restart your SAP instance atleast once in a month and it will clear the buffers . I guess this is

the practical way of solving such issues . Anyway you can finetune the parameters as per the related

notes . And even if you tuned it once , the buffers will increase cumulative and will result such issues in

future. So need to restart the instance atleast once in a while .

For the related notes , you can go to SAP notes and search by ST02 . You will get all the relevent

notes .

Regards,

Nibu

[Former Member]

Hi

Go through following links for ST02 & ST03 in sap help portal. it will give you fair idea of memnory management and work load analysis.

[Link1|http://help.sap.com/saphelp_nw70/helpdata/EN/02/96263e538111d1891b0000e8322f96/content.htm]

[Link2|http://sap.ittoolbox.com/groups/technical-functional/sap-basis/high-rollwait-time-1514656?cv=expanded]

[Link3|http://help.sap.com/saphelp_nw70/helpdata/EN/95/8a393c3ab01224e10000000a11405a/content.htm]

Regards

Uday