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Buffers configuration

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Hi everybody.

We have notice poor performance in our system. At the same time job SAP_COLLECTOR_FOR_PERFMONITOR ends with errors 2 times every day, at 04:00 and at 20:00 everyday with dump TSV_TNEW_PAGE_ALLOC_FAILED.

Looking at ST02 I can see that all the Hit Ratio buffers are over 99% but swaps are mustly in red.

Can anybody tell me if this is normal behaviour or if I need to increase some parameters?.

Attached I send you an ST02 screenshot.

Thanks in advance for your help and best regards.

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Answers (2)

Answers (2)

michael_ruth3
Contributor
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Hi Deepak,

I would increase the InitialRecord and Export/Import as the hit ratio is too low for these. Your hit ratios should be 95% or better.

Also check note #785038, this note is a little outdated but it may give you an idea of what you need to do like download a support pack.

And note #1110822

Cheers,

former_member188883
Active Contributor
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Hi Francisco,

1) at 04:00 and at 20:00 check are there any long running background jobs ?

2) what is the SAP release and what is the server configuration ?

Regards,

Deepak Kori

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Hi Deepak.

At the time the job is running there are no other long running background jobs (max 47 seconds of execution).

My SAP release es ECC 6.0, kernel 7.20 patch 401, SAP_ABA, SAP_BASIS, etc release 7.01, level 10. The server configuration is an iSeries OS/400 release 6.1 in an LPAR with 3 processes units and 44,5 GB of memory asigned. The ASP has 1557 GB and is 76,57% in use.

The SAP instance has 41 work processes with two operations configuration:

-DAY: From 7am to 8pm: 20 dialog, 10 batch, 2 batchA, 4 spool, 4 update, 2 update2, 1 enqueue

-NIGHT: From 20pm to 7am: 5 dialog, 25 batch, 2 batchA, 4 spool, 4 update, 2 update2, 1 enqueue

Thanks for your help.

Former Member
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Hi Francisco,

                   Check note 1110822.

Also check whether any load is there in the system during that time when the job is getting failed.

Primarily it is due to exceeding the size of memory , please also let us know the profile parameter settings for memory parameters in your system.

Thanks and Regards,

Kunal Gahlot

former_member188883
Active Contributor
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Hi Francisco,

Looking at ST02 results , there is no enough free space for following buffers

table definition

program

screen

calendar

Export/Import

You can double click on the respective entries to identify SAP profile parameters associated with them,

Try to double the value and save the profile file

check the configuration of shared memory using sappfpar -check pf=<path of instance profile>

Ensure there are no errors.

Take SAP restart and monitor the buffer settings in ST02

Hope this helps.

Regards,

Deepak Kori

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Hi Deepak.

I will follow your sugestions and increase the buffers mentioned. As this issue exists only in our production system it will take me some time to restart the system in order to activate the changes. As soon as I test it I will feedback you.

Thanks again for your comments.

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Hi Deepak.

This is what I'm going to change:

Parameter                               Old Value           Increment           New Value

rsdb/ntab/entrycount                     39000                15600                    54600

rsdb/ntab/ftabsize                          80000                32000                  112000

rsdb/ntab/irbdsize                            9500                  3800                    13300

abap/buffersize                            960000              384000                1344000

zcsa/presentation_buffer_area 20000000           8000000              28000000

sap/bufdir_entries                           10000                 4000                    14000

zcsa/table_buffer_area           100000000         40000000            140000000

zcsa/db_max_buftab                       10000                 4000                   14000

rtbb/buffer_length                            60000               24000                   84000

rtbb/max_tables                                   500                   200                       700

rsdb/obj/buffersize                          128000              51200                 179200

rsdb/obj/max_objects                       32000               12800                   44800

rsdb/obj/large_object_size                  8192             3276,8                11468,8

ztta/roll_area                                 3000000          1200000               4200000

em/initial_size_MB                             8192              3276,8                   11264