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tune buffer sizes

Former Member
0 Kudos

i have to add the parameters

em/initial_size_MB= PM

em/max_size = 100000

when i entered the value of max_size = 100000

value is not permitted default is 64000

and one more thing is

rdisp/ROLL_MAXFS = [BE] * 100

rdisp/ROLL_SHM = [BE[ * 100

please can you give me the details of value for this its very urgent

Thanks very much

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Answers (3)

Answers (3)

Former Member
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how much space and database version are you using for memory base on the memory you have to tune your parameters you can refer sap notes 327494/203924

former_member433984
Active Contributor
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> i have to add the parameters

> em/initial_size_MB= PM

> em/max_size = 100000

em/initial_size_MB = <PHYS_MEMSIZE> is the piece of EM memory, reserved in page file. I would not recommend to set it to lower value as your RAM, because if EM is exhausted next EM chunk allocated is equal 1GB -> might lead to page file fragmentation.

em/max_size = 100000

this value must not be larger than "RAM+Pagefile size" as this is limitation for EM, that could be allocated in page file

> when i entered the value of max_size = 100000

> value is not permitted default is 64000

>

> and one more thing is

> rdisp/ROLL_MAXFS = [BE] * 100

> rdisp/ROLL_SHM = [BE[ * 100

>

> please can you give me the details of value for this

> its very urgent

>

> Thanks very much

rdisp/ROLL_MAXFS = [BE] * 100

rdisp/ROLL_SHM = [BE[ * 100

you can look in ST02 and ST02-History at "Max usage" for these parameters and reduce/increase them correspondingly

markus_doehr2
Active Contributor
0 Kudos

If it´s "very urgent" open an OSS call.

Buffers always depend on implementation (number of users, number of active modules, number of customizing transports getting transported, Unicode/non-unicode)... Tuning them is an iterative process, where you use a value, let the system run for some days and check them again.

--

Markus

Former Member
0 Kudos

Mr. Markus

Actually this is my Application Server last week i install one dialog instance on defferent host. for that only i have to tune the buffer sizes.

how can i put the default values. can you please explance me details

Thanks very much