Memory is a pain-in-the-bum, especially when it comes to the new Oracle 11g fusion middleware stack.
Caused by: java.sql.SQLRecoverableException: ORA-01034: ORACLE not available
ORA-27102: out of memory
Linux Error: 12: Cannot allocate memory
Additional information: 1
Additional information: 3637261
Additional information: 8
Solution 1: Decrease the WLS admin server
The issue with memory often comes from managed servers and not the admin servers. I would recommend setting the Maximum argument lower and see if that makes a different.
set setDomainEnv = WLS MAX AGS to 512! (Line 220 ish)
Solution 2: Investigate other programs running
Check if there's other programs running by running the top command. This will give you an idea on how much memory is left, what's soaking up the used memory etc. It's likely that you have some java program sapping-up the memory in the background that you could be using for better purposes.
Solution 3: Increase allocated memory for applications
As simple as it sounds, try increasing the programs with designated memory parameters, SOA and OIM especially or OIA if you're doing role mining.
XENGINE_DIR="${SOA_ORACLE_HOME}/soa/thirdparty/edifecs/XEngine"
DEFAULT_MEM_ARGS="-Xms512m -Xmx1024m"
PORT_MEM_ARGS="-Xms768m -Xmx1536m"
startup pfile=$ORACLE_HOME/dbs/initorcl.ora
Solution 4: Clearing the caches
The important figures here is the buffers/cache 4332/1111. You can see there's not much left in the memory and a lot within the buffered cache.
The best solution for this is to clear the cache by executing the following command:
sync; echo 3 > /proc/sys/vm/drop_caches
Solution 5: Altered the database
Prior to initiating the database, it may be a good idea to increase/decrease the pool size located from within the initoracl file
startup pfile=$ORACLE_HOME/dbs/initorcl.ora
orcl.__db_cache_size=419430400
orcl.__java_pool_size=16777216
orcl.__large_pool_size=16777216
orcl.__oracle_base='/opt/oracle'#ORACLE_BASE set from environment
orcl.__pga_aggregate_target=452984832
orcl.__sga_target=1040187392
orcl.__shared_io_pool_size=0
orcl.__shared_pool_size=57042534
4 orcl.__streams_pool_size=0
…
About the author
Daniel is a Technical Manager with over 10 years of consulting expertise in the Identity and Access Management space.Daniel has built from scratch this blog as well as technicalconfessions.com
Follow Daniel on twitter @nervouswiggles
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