Swaps in PXA Buffer (abap buffersizw)
Hi Experts
In my production server lot of swaps in PXA buffers, yesterday only I increased PXA buffer size 240000 to 270000, but still I am getting swaps in that PXA Buffer (ABAP/BufferSize), any body give the how much memory I have to increase to that respective buffers, what is the solution to over come this swap problems in PXA buffer
Best Regards
Mohammed. Khan
Hello,
Increasing the size of buffer swap space depend on hardware configuration of your system.
First check how much total paging space is allocated in your system.
Depending on your hardware configuration you can increase size of buffers.
you can check current value & SAP default value in your system...
check system load in your system. Sometimes due to more load swapping occurs...
If this continuously happens you need to check for all buffers.
You can check in ST02, which buffers are causing more swaps...
take action acc to that...
Regards
Anju
Similar Messages
-
Hello all,
I am trying to figure out why we started having many swaps in program buffer on ST02 and I found this on history that is quite strange.
It appears that Free storage is bigger than available storage!! Few months ago that we had the same issue, we started having again hundreds of swaps on this buffer. Could someone explain what this Free storage shows and probably suggest how to find the root cause of the issue?
Thanks!Hi Mik ASp,
See this link is usefully
ST02 - Explaining SAP buffer history statistics (IRDB buffer)
Regards,
Deva -
Hi *,
I have an ECC6.0 System with 32 bit Architecture WIN Server 2003 Enterpreise with 8 Gig Memory.
I have reserved a fixed memsize of 2 Gig for MSSQL Database
I have "installed" Zero Admin Management by setting PHYS_MEMSIZE = 5120
/3GB and /PAE is set in boot.ini
My buffers have a total volume of ~ 1Gig
PXA has 720 000 KB.
When I increase PXA System restart ist no longer possible undependent of the size of PHYS_MEMSIZE
Do you have an idea why PXA is limited in that way?
best regards
Thomas
Edited by: Thomas Volkwein on Jan 4, 2008 3:19 PMthe problem is that virtual address space on 32-bit is limited by 2(3 if /3GB is active in boot.ini)GB - see SAP notes 110172, 552209, 546361. Shortly to say, if you want to increase PXA buffer, you have to reduce some other buffers, however you should also keep in mind that PXA is buffer with contiguous structure, i.e. the process must have this free contiguous space.
720MB should be enough for PXA buffer in 99% of production systems.
If you see high paging value or bad hit ration you must review the quality of buffer.
using 64-bit platform (SAP note 996600) will help you to avoid such problems -
Hi Gurus,
When should we tune buffer parameters?.
For example: Swaps for program buffer are 90,000. In which case we have to tune the program buffer?. I know there is no threshold or thumb rule for swaps in SAP system. What will be the base point to tune buffer parameters to reduce swaps?
Thanks in advance
A.S.KHi Siva,
Check this link out:
http://help.sap.com/saphelp_sm40/helpdata/en/c4/3a6ecc505211d189550000e829fbbd/content.htm
and
http://help.sap.com/saphelp_sm40/helpdata/en/c4/3a6f00505211d189550000e829fbbd/content.htm
Please award points accordingly.
Regards.
Ruchit. -
Swapping and Database Buffer Cache size
I've read that setting the database buffer cache size too large can cause swapping and paging. Why is this the case? More memory for sql data would seem to not be a problem. Unless it is the proportion of the database buffer to the rest of the SGA that matters.
Well I am always a defender of the large DB buffer cache. Setting the bigger db buffer cache alone will not in any way hurt Oracle performance.
However ... as the buffer cache grows, the time to determine 'which blocks
need to be cleaned' increases. Therefore, at a certain point the benefit of a
larger cache is offset by the time to keep it sync'd to the disk. After that point,
increasing buffer cache size can actually hurt performance. That's the reason why Oracle has checkpoint.
A checkpoint performs the following three operations:
1. Every dirty block in the buffer cache is written to the data files. That is, it synchronizes the datablocks in the buffer cache with the datafiles on disk.
It's the DBWR that writes all modified databaseblocks back to the datafiles.
2. The latest SCN is written (updated) into the datafile header.
3. The latest SCN is also written to the controlfiles.
The following events trigger a checkpoint.
1. Redo log switch
2. LOG_CHECKPOINT_TIMEOUT has expired
3. LOG_CHECKPOINT_INTERVAL has been reached
4. DBA requires so (alter system checkpoint) -
Reset or Bypass SQL Buffer ABAP Program
Hi,
How to bypass or reset the use of the buffer table in an ABAP program with the purpose of evaluating their performance access. I can not change the program because it is in production.
Thanx.
DiovaniHi ,
I am giving you the SAP standrad help comments here as prescriblely :
FROM clause
Specifies the database tables from which the data in the selection in the SELECT clause is to be read.
Syntax
... FROM [<tab> [INNER]|LEFT [OUTER] JOIN] <dbtab> [AS <alias>]
[ON <cond>]
[CLIENT SPECIFIED]
[BYPASSING BUFFER]
[UP TO <n> ROWS]
You can read a single table <dbtab> or more than one table, using inner and outer joins to link tables with conditions <cond>, where <tab> is a single table or itself a join condition. You can specify individual database tables either statically or dynamically, and you can replace their names with an alternative <alias>. You can bypass automatic client handling with the CLIENT SPECIFIED addition, and SAP buffering with BYPASSING BUFFER. You can also restrict the number of lines read from the table using the UP TO <n> ROWS addition.
For More Information please see this link : using keyword in find "BYPASSING BUFFER"
Link: [http://help.sap.com/saphelp_46c/helpdata/en/87/56d00722c011d2954a0000e8353423/frameset.htm]
Regards, -
How to understand buffer swaps
In SAP training materials, it says that buffer swaps occur when buffer content is deleted from the buffer and is replaced by other content. It's no relation at all to the swapping mechanism on OS level.
I am confused about the source and target of buffer swaps. For example, when buffer swaps occur on program buffer(PXA), where will the data in program buffer be put, physical memory?, and where does new data come from? SAP buffers locate on share memory, belong to virtual memory, but virtual memory is the summary of physical memory and OS swap space(or OS paging file). I just remember that extended memory resides on physical memory, don't know whether sap buffers reside on physical too.
For swapping on OS level, I think it's page exchange between physical memory and swap space which locates on disk. Is it right?
Please advise on how to understand buffer swaps and OS swapping. Thanks so much.
JamesHi James,
Plz find the link I hope it might help you,
http://help.sap.com/saphelp_nw70/helpdata/EN/c4/3a6dbb505211d189550000e829fbbd/frameset.htm
as the question you have asked is concentrating in
depth and this can be understood if you have a look
at the following link.
regards,
Manjula. -
ST02 SWAPS reported what does that mean.
Hi Team,
In ST02 of one of the system all the apps I see many SWAPS column with value and in red color, what it mean
program, swaps with 11,349
generic key with 68
single record with 1,002
Thanks
VijayHi,
ST02 is the buffer monitor that offers instance specific information that provides:
1. status of different buffers instance wise
2. information on memory usage instance wise
3. information on table buffering at instance level
Swapping takes place for two reasons:
1. not enough 'free space left' in buffer for buffering new objects
2. buffer has run ouf of 'free directory entries' that can be contained in one buffer area *
Directory entries diminish the available size of the buffer, independent of their usage.
Swaps are to be avoided, as are all other situations leading to lines shown in red in the ST02 display.
Please note that Buffer swaps occur when buffer content is deleted from the buffer and is replaced by other content. It has no relation at all to the swapping mechanism on OS level.
An example with a more practical outlook to swapping observed:
Use transactions SM50, ST03N and ST02 to identify the problem.
a. Using SM50 you might find high number of work processes accessing tables related to ABAP sources and status as 'Load Program'. This hints to a problem with Program [PXA] buffer.
b. In transaction ST03N, you find unusually high 'load and generation time' causing even higher wait times. Threshold for load and generation time is typically 50 ms.
c. In buffer monitor i.e. ST02, you find many swaps [typically more than 10000 swaps happening per day for program buffer]. Check on hit ratio [value below 95% is typically poor]. This indicates problem. Program buffer could be small!!
If program buffer is small, it means that workprocesses require to reload program loads over and over again which causes bad system performance.
Resolution: Increase program buffer size/ check on load and generation times/ hit-ratio increases/ system response time also lowers down!! : )
Regards,
Shabnam. -
Many SwaP entries found on ST02
Hi Team,
When i perform a weekly helath check on production system.I found that many swap entires are popping up in red and also users feeling that system is running bit slow since few days. Can some one please help us in indentifying the issue and sugegst us on fixign this issue.
Buffer Hitratio Allocated Free space Dir. size Free directory Swaps DB [%] [kB] [kB] [%] Entries Entries [%] accesses
Nametab (NTAB)
Table definition 98.09 6,330 2,494 43.73 20,000 8,745 43.73 0 11,993
Field description 95.61 30,859 5,609 18.70 20,000 15,964 79.82 15,157 19,756
Short NTAB 97.05 3,332 2,830 94.33 5,000 4,470 89.40 0 530
Initial records 92.49 6,332 974 16.23 5,000 1,466 29.32 13,182 16,716
Program 98.06 400,000 737 0.20 100,000 91,336 91.34 31,726 121,302
CUA 98.67 3,000 108 4.31 1,500 1,246 83.07 11,581 856
Screen 98.06 4,297 4 0.12 10,000 9,632 96.32 301 1,404
Calendar 99.76 488 359 75.10 200 48 24.00 0 152
OTR 100.00 4,096 3,439 100.00 2,000 2,000 100.00 0 0
Tables
Generic key 99.04 29,297 2,606 9.34 5,000 1,092 21.84 133 42,758
Single record 93.87 10,000 2,765 28.07 500 337 67.40 0 18,068
Export/import 81.17 4,096 137 3.98 2,000 730 36.50 37,036 0
Exp./Imp. SHM 92.22 4,096 3,301 95.99 2,000 1,996 99.80 0 0
Do i need modify any memory parameters on my system? Please see the memory parameters configured on servers as follows
Program buffer:
Abap/buffersize 400000 kB
Screen Buffer:
Zcsa/presentation_buffer_area 4400000
Sap/bufdir_entries 10000
Screen buffer
zcsa/presentation_buffer_area 4400000 Byte
Sap/bufdir_entries 10000
Export/import buffer
rsdb/obj/buffersize 4096 kB
rsdb/obj/max_objects 2000
rsdb/obj/large_object_size 8192 Byte
rsdb/obj/mutex_n 0
Few other :
abap/heap_area_dia 2000000000 Bytes
abap/heap_area_nondia 2000000000 Bytes
abap/heap_area_total 5000000000 Bytes
abap/heaplimit 40000000 Bytes
em/address_space_MB 512 MB
Thanks & Regards,
VinodHi Every one,
Thanks for all your inputs.
As Suggested we have restarted the production server however identified many swap entries red as fllows( Field Description- 30,970, intial Records- 26,169, Program Buffer - 71,628, CUA- 30,442, Screen - 826 ) and Tables Generic Key - 389 & Export / Import - 247,144 )
I see that Buffer Hit ration of EXport / Import is 83.93 except this all other buffers are above 99 % .
Below are my system configuration details:
OS: WIN - 2003
SAP Version : ECC 5.0
Main Memory Configured : 6 GB
Paging Memory : 15 GB
Memory Parameters :
rsdb/ntab/ftabsize 30000 kB Size of field description buffer
rsdb/ntab/entrycount 20000 Max. number / 2 of table descriptions buffered
FTAB needs about 700 bytes per used entry **
Initial record buffer IRBD
rsdb/ntab/irbdsize 6000 kB Size of initial record buffer
rsdb/ntab/entrycount 20000 Max. number / 2 of initial records buffered
IRBD needs about 300 bytes per used entry **
Program buffer PXA
abap/buffersize 400000 kB Size of program buffer
abap/pxa shared Program buffer mode
CUA buffer
rsdb/cua/buffersize 3000 kB Size of CUA buffer
The number of max. buffered CUA objects is always: size / (2 kB)
Generic key table buffer TABL
zcsa/table_buffer_area 30000000 Byte Size of generic key table buffer
zcsa/db_max_buftab 5000 Max. number of buffered objects
Export/import buffer EIBUF
rsdb/obj/buffersize 4096 kB Size of export/import buffer
rsdb/obj/max_objects 2000 Max. number of objects in the buffer
rsdb/obj/large_object_size 8192 Byte Estimation for the size of the largest object
rsdb/obj/mutex_n 0 Number of mutexes in Export/Import buffer
Based on the above information, Could some one please help me in tunning the memory parameters ( i.e at what extent i can increase / Decrease ) as i was doing this first time.
Would be much appreciable if some could throw some light on this issue.
Many Thanks,
Vinod -
Hi
In my Development System when i check Tune Summary (ST02) ,i could see Swap rate is high for some prarameters viz
Program buffer PXA
abap/buffersize 400000 kB Size of program buffer
abap/pxa shared Program buffer mode
Screen buffer PRES
zcsa/presentation_buffer_area 4400000 Byte Size of screen buffer
sap/bufdir_entries 2000 Max. number of buffered screens
Generic key table buffer TABL
zcsa/table_buffer_area 30000000 Byte Size of generic key table buffer
zcsa/db_max_buftab 5000 Max. number of buffered objects
Export/import buffer EIBUF
rsdb/obj/buffersize 4096 kB Size of export/import buffer
rsdb/obj/max_objects 2000 Max. number of objects in the buffer
rsdb/obj/large_object_size 8192 Bytes Estimation for the size of the largest object
rsdb/obj/mutex_n 0 Number of mutexes in Export/Import buffer
Swap rate for Export/import buffer is almost 120 swaps per day.
Moreover 2 instance are running on these server having 4gb RAM Capacity.
plz tell me to what extent i have to increase the size of these parameters so that swap rate comes down.
regards
suresh
Message was edited by:
ganesh reddy kanthalaHi
Thanks for ur immediate response.
I have installed ECC 6.0 version R/3 system .25 users are working in my Development system.
kindly let me know what docs i have to follow inorder to increase the buffer parameters.
Regards
ganesh -
Hi All,
my DEV system is running very slow and Swap size increased.
while i run the following command for reset the buffer.
/$SYNC This resets all buffers of the application server
/$CUA This resets the CUA buffer of the application server
/$TAB This resets the TABLE buffers of the application server
/$NAM This resets the nametab buffer of the application server
i did restart the system after run above command then ST02 went to normal swap while swap is
increasing once again. I am send you ST02 status and Parameters and please have a look and
guide me.
while here window server 2003 with ECC 6.0 SR3 and oracle 10.2.
I am waiting your respons.
Regards,
jamilSTO2 StatusSystem: DEVQAS_DEV_00 Tune summary
Date + Time of Snapshot: 05.06.2009 17:29:47 Startup: 03.06.2009 08:55:27
Buffer
HitRatio %
Alloc. KB
Freesp. KB
% Free Sp.
Dir. Size
FreeDirEnt
% Free Dir
Swaps
DB Accs
Nametab (NTAB)
0
Table definition
95,85
6.799
20.000
1.341.692
1.750.297
Field definition
95,83
31.563
8.427
28,09
20.000
13.682
68,41
690.429
697.825
Short NTAB
99,27
3.625
1.871
62,37
5.000
1.190
23,80
0
3.831
Initial records
73,84
6.625
4.018
66,97
5.000
303
6,06
306.360
311.206
0
program
72,69
300.000
1.132
0,39
75.000
67.969
90,63
732.729
2.224.962
CUA
97,19
3.000
328
13,34
1.500
1.383
92,20
176.277
5.549
Screen
96,54
4.297
9
0,22
2.000
1.581
79,05
2.834
9.744
Calendar
99,93
488
365
76,36
200
49
24,50
0
151
OTR
100,00
4.096
3.375
100,00
2.000
2.000
100,00
0
0
Tables
0
Generic Key
98,50
29.297
2.542
9,16
5.000
569
11,38
985
499.486
Single record
82,98
10.000
471
4,79
500
359
71,80
172
391.479
0
Export/import
68,57
4.096
331
9,81
2.000
1.130
56,50
202.578
Exp./ Imp. SHM
91,26
4.096
3.179
94,19
2.000
1.999
99,95
0
SAP Memory
Curr.Use %
CurUse[KB]
MaxUse[KB]
In Mem[KB]
OnDisk[KB]
SAPCurCach
HitRatio %
Roll area
0,99
2.592
6.048
262.144
0
IDs
99,63
Page area
1,13
2.950
96.584
131.072
131.072
Statement
91,00
Extended memory
2,90
729.088
1.826.816
25.161.728
0
0,00
Heap memory
0
0
0
0
0,00
Call Stati
HitRatio %
ABAP/4 Req
ABAP Fails
DBTotCalls
AvTime[ms]
DBRowsAff.
Select single
90,05
4.696.725
836.510
351.994
0
3.860.215
Select
82,59
16.964.115
0
815.771
0
11.741.945
Insert
0,00
35.170
1.598
39.302
0
226.530
Update
0,00
15.252
7.933
18.947
0
12.524
Delete
0,00
27.722
22.117
33.445
0
108.091
Total
86,32
21.738.984
868.158
1.259.459
0
15.949.305
while profile parameter is:
System: DEVQAS_DEV_00 Profile Parameters for SAP Buffers
Date and Time: 05.06.2009 19:27:14
Buffer Name Comment
Profile Parameter Value Unit Comment
Program buffer PXA
abap/buffersize 300000 kB Size of program buffer
abap/pxa shared Program buffer mode
|
CUA buffer CUA
rsdb/cua/buffersize 3000 kB Size of CUA buffer
The number of max. buffered CUA objects is always: size / (2 kB)
|
Screen buffer PRES
zcsa/presentation_buffer_area 4400000 Byte Size of screen buffer
sap/bufdir_entries 2000 Max. number of buffered screens
|
Generic key table buffer TABL
zcsa/table_buffer_area 30000000 Byte Size of generic key table buffer
zcsa/db_max_buftab 5000 Max. number of buffered objects
|
Single record table buffer TABLP
rtbb/buffer_length 10000 kB Size of single record table buffer
rtbb/max_tables 500 Max. number of buffered tables
|
Export/import buffer EIBUF
rsdb/obj/buffersize 4096 kB Size of export/import buffer
rsdb/obj/max_objects 2000 Max. number of objects in the buffer
rsdb/obj/large_object_size 8192 Bytes Estimation for the size of the largest object
rsdb/obj/mutex_n 0 Number of mutexes in Export/Import buffer
|
OTR buffer OTR
rsdb/otr/buffersize_kb 4096 kB Size of OTR buffer
rsdb/otr/max_objects 2000 Max. number of objects in the buffer
rsdb/otr/mutex_n 0 Number of mutexes in OTR buffer
|
Exp/Imp SHM buffer ESM
rsdb/esm/buffersize_kb 4096 kB Size of exp/imp SHM buffer
rsdb/esm/max_objects 2000 Max. number of objects in the buffer
rsdb/esm/large_object_size 8192 Bytes Estimation for the size of the largest object
rsdb/esm/mutex_n 0 Number of mutexes in Exp/Imp SHM buffer
|
Table definition buffer TTAB
rsdb/ntab/entrycount 20000 Max. number of table definitions buffered
The size of the TTAB is nearly 100 bytes * rsdb/ntab/entrycount
|
Field description buffer FTAB
rsdb/ntab/ftabsize 30000 kB Size of field description buffer
rsdb/ntab/entrycount 20000 Max. number / 2 of table descriptions buffered
FTAB needs about 700 bytes per used entry
|
Initial record buffer IRBD
rsdb/ntab/irbdsize 6000 kB Size of initial record buffer
rsdb/ntab/entrycount 20000 Max. number / 2 of initial records buffered
IRBD needs about 300 bytes per used entry
|
Short nametab (NTAB) SNTAB
rsdb/ntab/sntabsize 3000 kB Size of short nametab
rsdb/ntab/entrycount 20000 Max. number / 2 of entries buffered
SNTAB needs about 150 bytes per used entry
|
Calendar buffer CALE
zcsa/calendar_area 500000 Byte Size of calendar buffer
zcsa/calendar_ids 200 Max. number of directory entries
|
Roll, extended and heap memory EXTM
ztta/roll_area 3000000 Byte Roll area per workprocess (total)
ztta/roll_first 1 Byte First amount of roll area used in a dialog WP
ztta/short_area 3200000 Byte Short area per workprocess
rdisp/ROLL_SHM 32768 8 kB Part of roll file in shared memory
rdisp/PG_SHM 16384 8 kB Part of paging file in shared memory
rdisp/PG_LOCAL 150 8 kB Paging buffer per workprocess
em/initial_size_MB 24574 MB Initial size of extended memory
em/blocksize_KB 4096 kB Size of one extended memory block
em/address_space_MB 4096 MB Address space reserved for ext. mem. (NT only)
ztta/roll_extension 2000000000 Byte Max. extended mem. per session (external mode)
abap/heap_area_dia 2000000000 Byte Max. heap memory for dialog workprocesses
abap/heap_area_nondia 0 Byte Max. heap memory for non-dialog workprocesses
abap/heap_area_total 25767706624 Byte Max. usable heap memory
abap/heaplimit 40000000 Byte Workprocess restart limit of heap memory
abap/use_paging 0 Paging for flat tables used (1) or not (0)
|
Statistic parameters
rsdb/staton 1 Statistic turned on (1) or off (0)
rsdb/stattime 0 Times for statistic turned on (1) or off (0)
In order to change one of the above parameters...
1) Edit your system profile F:\usr\sap\DEV\SYS\profile\DEV_DVEBMGS00_DEVQAS
(You can use the buttons Profile Maintenance or @0Z@ Profile Parameter above)
2) Activate the parameter by restarting your local SAP system
plz now guide me which parameter i have to increase..
regards, -
Hi
In my Development System when i check Tune Summary (ST02) ,i could see Swap rate is high for some prarameters viz
Program buffer PXA
abap/buffersize 400000 kB Size of program buffer
abap/pxa shared Program buffer mode
Screen buffer PRES
zcsa/presentation_buffer_area 4400000 Byte Size of screen buffer
sap/bufdir_entries 2000 Max. number of buffered screens
Generic key table buffer TABL
zcsa/table_buffer_area 30000000 Byte Size of generic key table buffer
zcsa/db_max_buftab 5000 Max. number of buffered objects
Export/import buffer EIBUF
rsdb/obj/buffersize 4096 kB Size of export/import buffer
rsdb/obj/max_objects 2000 Max. number of objects in the buffer
rsdb/obj/large_object_size 8192 Bytes Estimation for the size of the largest object
rsdb/obj/mutex_n 0 Number of mutexes in Export/Import buffer
Swap rate for Export/import buffer is almost 120 swaps per day.
Moreover 2 instance are running on this server having 4gb RAM Capacity.
i have installed ECC 6.0 version sap system,O/S RHEL4 ,64 BIT .
25 users working regularlly on the system.
plz tell me to what extent i have to increase the size of these parameters so that swap rate comes down.
regards
ganeshHi,
Beacuse you are unsing 64bitYou can increase the size of the rsdb/obj/buffersize parameter for larger size:
rsdb/obj/buffersize = 60000
rsdb/obj/max_objects = 15000
this should provide you with the solution.
For more information read this note:702728
Also you should know that swaps doesn't necessary meam BAD.
What should interesting you is the hit ratio.
Reagrds. -
Dear all,
We are using R/3 4.6C on HP-UX 11.0 with Oracle 9.2.0.5 and kernel sup. package 2039. On this server we have two production R/3 instances. Server has 8 CPUs, and 8GB RAM, with defined swap of 20GB.
Can You PLS explain:
- we have more then 92000 swaps on the program buffer in one week only on one instance which has more users and more transport activities;
- Should I increase the parametar abap/buffersize (currently 500000kB)? And how much should it be?
- ipc/shm_psize_06 should it be = -10 and ipc/shm_psize_02 = -10?
I'm not sure what are the steps to increase the program buffer, and how much should it be increased?
Thank you in advance.
Regards,
RuzicaHi Ruzica,
Have you seen OSS note 103747 which describes the recommended parameter settings for 40B and above ?
It looks like you may need to increase it slightly (profile parameter abap/buffersize). The note suggests that the system can tolerate 1,000 swaps per day but you are seeing over 10,000 per day.
In our busiest SAP system, R/3 Retail, we have a PXA buffer size of 600Mb and we experience between 1000-2000 swaps per day. However, it depends what mix of modules you are using in the system. This greatly influences the programs that are loaded.
You mentioned that you have two instances on the one server. Is this the CI and one application server for the SAP system or is it two separate SAP systems (i.e. separate SIDs) ?
If the two servers are part of the same SAP system, it may be worth looking at how the users are being distributed across the two servers.
Regards,
Gary -
Memory parameters settings as per RAM and swap size
Hello Experts,
We have installed the newly SAP systems (Solman 7.1, ECC6 EHP 5, and CRM EHP1), below is the platform-
OS - Linux x86_64
RAM - 20 GB (ECD ABAP and solman (ABAP+JAVA)) and 24 GB (CRM ABAP).
swap size is twice of RAM.
Kernel - 720 64bit
Current memory parameters values are (by default) -
ztta/roll_area 6500000
ztta/roll_first 1
ztta/short_area 3200000
rdisp/ROLL_SHM 32768
rdisp/PG_SHM 32768
rdisp/PG_LOCAL 150
em/initial_size_MB 4096
em/blocksize_KB 4096
em/address_space_MB 4096
ztta/roll_extension 2000000000
abap/heap_area_dia 2000000000
abap/heap_area_nondia 2000000000
abap/heap_area_total 2000000000
abap/heaplimit 40000000
abap/use_paging 0
Could anyone suggest the calculation for above parameters so I can tune it according to my platform to avoid any memory bottleneck.
Regards
Saurabh MishraHI
For 20 Gb Instance For 24 GB
ztta/roll_area 6500000 em/initial_size_MB 16000 MB
ztta/roll_first 1
ztta/short_area 3200000
rdisp/ROLL_SHM 32768
rdisp/PG_SHM 32768
rdisp/PG_LOCAL 150
em/initial_size_MB 12000
em/blocksize_KB 4096
em/address_space_MB 4096
ztta/roll_extension 2000000000
abap/heap_area_dia 2000000000
abap/heap_area_nondia 10000000000
abap/heap_area_total 12000000000
abap/heaplimit 40000000
abap/use_paging 0
and Configure ABAP Buffer abap /buffer size of 800 MB(Initially)
CUA and Screen Buffer of 20 Mb each.
The lowered values because DB Should be considered while changing SAP Memory,even though memory is allocated on need basis.
Regards
Arun.H -
Hi,
When I hit the T code ST02, it gives me some parameters (Initial records, Program, CUA, Screen, Generic key, Export/import) in red colour, at present we have the following values for current parameters.
Program buffer
abap/buffersize 150000
abap/pxa shared
CUA buffer
rsdb/cua/buffersize 3000
Screen buffer
zcsa/presentation_buffer_area 4400000
sap/bufdir_entries 2000
Generic key table buffer
zcsa/table_buffer_area 30000000
zcsa/db_max_buftab 5000
Single record table buffer
rtbb/buffer_length 10000
rtbb/max_tables 500
Export/import buffer
rsdb/obj/buffersize 4096
rsdb/obj/max_objects 2000
rsdb/obj/large_object_size 8192
rsdb/obj/mutex_n 0
OTR buffer
rsdb/otr/buffersize_kb 4096
rsdb/otr/max_objects 2000
rsdb/otr/mutex_n 0
Exp/Imp SHM buffer
rsdb/esm/buffersize_kb 4096
rsdb/esm/max_objects 2000
rsdb/esm/large_object_size 8192
rsdb/esm/mutex_n 0
Table definition buffer
rsdb/ntab/entrycount 20000
Field description buffer
rsdb/ntab/ftabsize 30000
rsdb/ntab/entrycount 20000
Initial record buffer
rsdb/ntab/irbdsize 6000
rsdb/ntab/entrycount 20000
Short nametab (NTAB)
rsdb/ntab/sntabsize 3000
rsdb/ntab/entrycount 20000
Calendar buffer
zcsa/calendar_area 500000
zcsa/calendar_ids 200
Roll, extended and heap memory
ztta/roll_area 2000000
ztta/roll_first 1
ztta/short_area 1600000
rdisp/ROLL_SHM 32768
rdisp/PG_SHM 16384
rdisp/PG_LOCAL 150
em/initial_size_MB 4915
em/blocksize_KB 1024
em/address_space_MB 512
ztta/roll_extension 2000000000
abap/heap_area_dia 2000000000
abap/heap_area_nondia 2000000000
abap/heap_area_total 2000000000
abap/heaplimit 40000000
abap/use_paging 0
Statistic parameters
rsdb/staton 1
rsdb/stattime 0
If I change the value (increase them) then is it cuase any problem or any specific hardware configuration is required for the same?
Please suggest
Regards,
Rajeshthe parameters are indicating that your system is running on 32 Bit Windows.
therefore you should have a look at this [document|https://websmp106.sap-ag.de/~sapidb/011000358700006425762006E].
regards
Peter
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