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3) Increase WAS heapsize:
https://www.ibm.com/docs/supporten/knowledgecenteriis/SSZJPZ_11.5.0/com.ibm.swg.im.iis.mdwb.doc/topics/t_computing_memory.html?topic=catalog-computing-allocating-memory-information-governance
4) Manage operational metadata. If you only need operational metadata from the last thirty days remove OMD older than thirty days using istool:
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