Swaps values showing in RED -TCODE ST02

[Former Member]

Hi All,

When I checked the ST02 transaction value of "SWAPS" for program buffer,CUA buffer,screen buffer, Tables generic key buffer and export/import buffer are showing in "RED" colour.

(%) (kb) %

Buffer Hitratio Allocated Free Space swaps

Program 99.88 900000 0.36 19541

CUA 99.9 10,000 1.27 37960

export/import 94.33 40,000 29.10 750,676

Swaps value are showing in RED mark....Is there somthing fishy? What can be done to overcome this issue?

Thanks in advance

Regards,

Prashant.

[Former Member]

Dear Prashant,

SWAP is the amount of page space available at OS level. In case of windows it should not be more than 4 times the ram and in case of UNIX 3 times the ram. If swap or paging is configured high is the paging rate and low is the performance. If there is no more free directory entries are available in the buffer for new objects, old objects are removed and the space is occupied by new objects thus a swapping takes place i.e some buffer content is removed from the buffer and replaced by new buffer contents. High swap is normally a symptom of memory bottleneck.

Red indicates swaps are to be avoided and indicate that there might be a bottleneck.

What can be done to overcome this issue?

You need to increase the parameter then.

Double-click on the red value, click on "current parameters" and increase that parameter in the instance profile using RZ10. If the parameters are not yet in the profile, add them.

After changing the instance profile you need to restart the instance.

Regards,

Ashutosh

[Former Member]

i am too facing the same problem .

can u explain more on directory entries .

also the explanation u gave on buffers in awesome .

do u have anu urls where in we can find concepts and importance of the buffers available in st02 .

bcoz we are totally unaware of where it would exaclty hot because of the alerts in them

[Former Member]

Dear Susin,

Check this out:

http://help.sap.com/saphelp_nw2004s/helpdata/en/02/9625e3538111d1891b0000e8322f96/content.htm.

http://help.sap.com/saphelp_nw2004s/helpdata/en/bc/4a813b680c250fe10000000a114084/content.htm

PS: Also if you have any query then please search and if you wont get relevant details or you have some confusion then open a new thread.

Regards,

Ashutosh

[Former Member]

Hi Ashutosh,

Thanks a lot. You want to say we need to increase the buffer space......for example for export/import buffer swaps value is coming in RED color so do we need to increase the buffer space? ...and I think there is one limitation on dir space that it should be less than half of total buffer space.

Regards,

Prashant.

[Former Member]

Dear Prashant,

For getting the standard values you need to run the program "RSPARAM" - execute it via SE38. You can also get the default value of the various parameters via Tcode RZ11

Buffer tuning is very individual and every system needs its own settings, depending on the applications used, number of concurrent users, languages, number of transports running into the system, non-unicode/unicode etc.

Usually what happens after going Live with a new system, the SAP support calls you and you get a going Live check (Early Watch). They analyze the last days of the system load and recommend parameter settings which will be specific for your environment.

Regards,

Ashutosh