Full GC does not free all memory

System is configured with a large heap (~3G), probably much bigger than it needs to be IMHO, but the developers are seeing the following and want to know why:
As the application runs heap is used, we see minor GCs and finally see a Full GC.
After the Full GC very little memory is actually freed:
14970.654: [ParNew 3192761K->2803025K(3210880K), 0.0796463 secs]
14980.616: [ParNew 3183162K->2794633K(3210880K), 0.0818737 secs]
14983.435: [GC 2892773K(3210880K), 0.5296831 secs]
15006.100: [ParNew 3186595K->2795356K(3210880K), 0.0833804 secs]
15018.538: [ParNew 3195996K->2805448K(3210880K), 0.0809474 secs]
15023.679: [GC 3006631K(3210880K), 0.2788505 secs]
15039.125: [Full GC 3174181K->2766248K(3210880K), 66.1657414 secs]
15108.029: [GC 3058032K(3210880K), 1.2886333 secs]
15110.294: [ParNew 3166871K->2782594K(3210880K), 0.0857900 secs]
15113.205: [ParNew 3183234K->2799956K(3210880K), 0.0949253 secs]
15149.340: [Full GC 3200596K->2781407K(3210880K), 66.4635854 secs]However, if they force a GC from an external source (such as Jconsole) MUCH more memory is freed.
The question is, why is so little memory freed when an automatic Full GC happens compared to a forced (externally initiated) Full GC?
Relevant config:
-DLOG_COMPATMODE=Off
-Djava.protocol.handler.pkgs=com.iplanet.services.comm
-Dcom.iplanet.am.serverMode=true
-Xloggc:/usr/local/sun/ws6.1/https-gcptl/logs/gc.log
-server
-Xss128k
-XX:NewSize=392M
-XX:MaxNewSize=392M
-XX:+DisableExplicitGC
-XX:+UseParNewGC
-XX:+UseConcMarkSweepGC
-XX:+PrintClassHistogram
-XX:+PrintGCTimeStamps
-XX:ParallelGCThreads=8
-Djava.util.logging.manager=com.iplanet.ias.server.logging.ServerLogManager
-Xms3136M -Xmx3136M
-Dsun.rmi.dgc.client.gcInterval=1800000
-Dsun.rmi.dgc.cleanInterval=3600000

Hi Jeanette,
Looks like the data is getting overwritten in the DSO. This usually happens when there are records with same Key Fields and also has certain characteristics that are unique but not key fields.
I suggest, you take a subset of a GL for which the data does not match, then compare the entries in the DSO and the PSA.
For Eg: If Business Area is not the key, then the data for all the same business areas will be overwritten. Thus making the BA key would eliminate the problem.
Hope this helps.
Regards,
Gaurav

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Full extractor does not load all the g/l accounts

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I have a empy DataStore Object (ZFI_O02) and I want to load the information (g/l accounts) with a full infopackage. The load have the status of "Green" but when I check the information I have accounts without some documents. I do not know why my full extractor does not load correctly all the information.
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Hi Jeanette,
Looks like the data is getting overwritten in the DSO. This usually happens when there are records with same Key Fields and also has certain characteristics that are unique but not key fields.
I suggest, you take a subset of a GL for which the data does not match, then compare the entries in the DSO and the PSA.
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Thankyou to all for the welcome and your responses to my query.
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Here is someone with a similar problem back in 2000:
"From TacitRF
Date: Thurs, Jun 8 2000 12:00am
Email: [email protected] (TacitR)
Groups: comp.sys.mac.system
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Using term set as refiner in content search web part does not show all used terms

When you create a terms set (12 terms with +/- 10-20 child terms) , attach it to a site column and allow multiple values to be selected the search service does not find all used values in the REFINERS tab of the content search web part.
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