File system gets filled due to Report cache in Oracle apps R12

In Oracle Apps R12 the report server is started by the concurrent manager whenever there is a need to run a report and it is an in-process report server which is started as per the need.

During this process the oracle reports writes to a temporary cache directory. The path and cache size is defined in the rwbuilder.conf file.

For example:

<cache class="oracle.reports.cache.RWCache">
<property name="cacheSize" value="50"/>
<property name="cacheDir" value="full path for $INST_TOP/logs/ora/10.1.2/reports/cache"/>
<!--property name="maxCacheFileNumber" value="max number of cache files"/-->
<!--property name="ignoreParameters" value="parameter names to be ignored in constructing cache key, separated by comma ','"/-->
</cache>

This cache directory doesn’t have any control on its growth and purging, though its temporary in nature. The Purge Concurrent Request and/or Manager Data" (FNDCPPUR) program also doesn’t purge these files.

Hence as more oracle reports are run, more temporary files gets created and space gets filled up under:

 $INST_TOP/logs/ora/10.1.2/reports/cache.

Solution: 

1. Manually delete the files under:

$INST_TOP/logs/ora/10.1.2/reports/cache

2. Change the cache size parameter in rwbuilder.conf to zero:

<property name="cacheSize" value="50"/> to
<property name="cacheSize" value="0"/>