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See https://docs.jboss.org/hibernate/orm/3.3/reference/en-US/html/batch.html

Hibernate Cache Management in DSpace Command Line Tools

Some DSpace command line tools process a large number of DSOs from a single Context object.  In such a case, the hibernate cache can become too large and trigger memory exceptions.

In such a case, it is necessary to explicitly purge items from the DSpace cache.  

For instance, when re-indexing DSpace, the entire hierarchy is traversed.  DSOs are removed from the cache once they are no longer needed.

• See https://github.com/DSpace/DSpace/blob/dspace-6.1/dspace-api/src/main/java/org/dspace/discovery/IndexClient.java#L175-L176
• See https://github.com/DSpace/DSpace/blob/dspace-6.1/dspace-api/src/main/java/org/dspace/discovery/IndexClient.java#L183-L184
• See https://github.com/DSpace/DSpace/blob/dspace-6.1/dspace-api/src/main/java/org/dspace/discovery/IndexClient.java#L207-L208

Hibernate Issues Discovered in DSpace 6.1

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