Reputation: 107
I am trying to execute some java code in Oracle JVM but getting java.lang.OutOfMemoryError.
so I want to dedicate more memory to Oracle JVM. How shuld we do that?
Thanks in advance.
Upvotes: 2
Views: 10465
Reputation: 4136
The above suggestions didn't work for me. You can use
select getMaxMemorySize() from dual
To show this. You can then set it using:
create or replace function setMaxMemorySize(num number) return number
is language java name
'oracle.aurora.vm.OracleRuntime.setMaxMemorySize(long) returns long';
then calling this function:
select setMaxMemorySize(1024*1024*1024) from dual;
Note: This only sets the max memory for the session. You will need to call this for each new session.
Upvotes: 0
Reputation: 2787
Seems you are exceeding the heap size of the OJVM.
First you need to find out how much heap size you have available right now in total:
Take a look at your initialization parameter JAVA_POOL_SIZE
. If it is 0, then you are using automatic memory management (10g or 11g) and the heap size is determined by the Oracle server "automagically". Then you can take sga_target
(10g) or memory_target
(11g) as an upper limit.
The maximum heap size per session is limited by the parameter java_max_sessionspace_size
(value 0 means default of 4GB).
With these two values at hand, take the smaller one and check if the memory requirements/heap size caused by your code should fit into this amount of memory.
java_pool_size
, sga_target
/memory_target
or
java_max_sessionspace_size
.See http://docs.oracle.com/cd/B28359_01/java.111/b31225/chnine.htm#BABGFDAE (Java Memory Usage) and http://docs.oracle.com/cd/B28359_01/server.111/b28320/initparams099.htm#REFRN10074 + http://docs.oracle.com/cd/B28359_01/server.111/b28320/initparams100.htm#REFRN10075 (Parameters) for detailled documentation.
And regarding your question "How to see memory allocated to Oracle JVM" in the subject:
select * from v$sgastat where pool = 'java pool';
Upvotes: 5
Reputation: 91
You can use the http://www.oracle.com/technetwork/java/javase/tech/vmoptions-jsp-140102.html, specifically -XX:MaxHeapFreeRatio and -XX:MinHeapFreeRatio
Upvotes: 0