Shared Memory Tuning: Startup database – ORA-27102: out of memory Linux-X86_64 Error: 28: No space left on device

May 22nd, 2018, posted in Linux OS, Oracle Queries, Uncategorized
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SQL> startup
ORA-27102: out of memory
Linux-x86_64 Error: 28: No space left on device
I have used RHEL X86_64 + memory (32GB) and setted sga_max_size=20G + sga_target=20G and …
$ cat /proc/sys/kernel/shmmax
26843545600
What wrong with my kernel tuning… So, I checked metalink (301830.1) and some recommend from RHEL
They told; set SHMALL to the total amount of physical RAM divided by page size.

SHMALL =>Total amount of shared memory available (bytes or pages)

then:
Check Page Size:
$ getconf PAGE_SIZE
4096
Determine the system wide maximum number of shared memory pages:
$ cat /proc/sys/kernel/shmall
2097152
My system 64bits with memory 32GB, then 1024 * 1024 * 1024 * 32 / 4096 = 8388608
So, change kernel.shmall = 8388608
$ su - root
# echo 8388608 > /proc/sys/kernel/shmall
Or modify /etc/sysctl.conf file:
kernel.shmall=8388608
and
# sysctl -p
After changed… check and startup database again:
$ cat /proc/sys/kernel/shmall
8388608
 
SQL> startup

.

.

.

--- NO ERROR ---
From this idea with memory 32GB
mem=$(free|grep Mem|awk '{print$2}')
totmem=$(echo "$mem*1024"|bc)
huge=$(grep Hugepagesize /proc/meminfo|awk '{print $2}')
max=$(echo "$totmem*75/100"|bc)
all=$(echo "$max/$huge"|bc)
echo "kernel.shmmax = $max"
echo "kernel.shmall = $all"
Result:
kernel.shmmax = 25213120512, kernel.shmall = 12311094
However, This case “ORA-27102: out of memory Linux-X86_64 Error: 28: No space left on device” , solved by set SHMALL = MemTotal(byte)/PAGE_SIZE
and …
I hope to hear your idea about kernel tuning with Oracle Database.
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Happy Birthday Hamza

May 20th, 2018, posted in DAtEs iN a YeAR, GiRLs, MESSAGEs
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Hamza, Hamza Happy Birthday, Happy Birthday, Happy Birthday Hamza

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Hazrat Ali To His Son

May 18th, 2018, posted in Islamic Teachings, MESSAGEs, Saying Of Hazrat Ali ( A.S )
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Oracle EBS Find Where Debug Is On

May 15th, 2018, posted in Oracle Queries
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Oracle EBS Find Where Debug Is On

If you have Debug is on at Site level then it will Impact the performance of the Instance, here is the script which will help you to quickly check your EBS Instance if ‘Debug’ is on (all level) of the EBS.

 

set linesize 160
col USER_PROFILE_OPTION_NAME for a30
col CONTEXT for a30
col VALUE for a30
col NAME for a30
 
SELECT po.profile_option_name "NAME",
po.USER_PROFILE_OPTION_NAME,
decode(to_char(pov.level_id),
'10001', 'SITE',
'10002', 'APP',
'10003', 'RESP',
'10005', 'SERVER',
'10006', 'ORG',
'10004', 'USER', '???') "LEV",
decode(to_char(pov.level_id),
'10001', '',
'10002', app.application_short_name,
'10003', rsp.responsibility_key,
'10005', svr.node_name,
'10006', org.name,
'10004', usr.user_name,
'???') "CONTEXT",
pov.profile_option_value "VALUE"
FROM FND_PROFILE_OPTIONS_VL po,
FND_PROFILE_OPTION_VALUES pov,
fnd_user usr,
fnd_application app,
fnd_responsibility rsp,
fnd_nodes svr,
hr_operating_units org
WHERE po.user_profile_option_name like '%Debug%'
AND pov.profile_option_value='Y'
AND pov.application_id = po.application_id
AND pov.profile_option_id = po.profile_option_id
AND usr.user_id (+) = pov.level_value
AND rsp.application_id (+) = pov.level_value_application_id
AND rsp.responsibility_id (+) = pov.level_value
AND app.application_id (+) = pov.level_value
AND svr.node_id (+) = pov.level_value
AND org.organization_id (+) = pov.level_value;

Sample ouptut:

 

NAME                           USER_PROFILE_OPTION_NAME       LEV      CONTEXT                        VALUE
---------------------------    ----------------------------   ------   ---------------------------    ---------------
AFLOG_ENABLED                  FND: Debug Log Enabled         USER     SA-USER1                       Y
FND_CONC_ALLOW_DEBUG           Concurrent: Allow Debugging    RESP     XXXX_CE_SUP_MY-MYR-GE          Y
PRINT_DEBUG                    FA: Print Debug                USER     SA-USER2                       Y
PO_SET_DEBUG_WORKFLOW_ON       PO: Set Debug Workflow ON      USER     SA-USER3                       Y
PA_DEBUG_MODE                  PA: Debug Mode                 USER     SA-USER4                       Y
SO_DEBUG                       OE: Debug                      SITE                                    Y
MSC_JAVA_DEBUG                 MSC: Enable Java Debug         SITE                                    Y
 
7 rows selected.
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