我在研究项目中使用 GraphDb Free 8.6.1，我在具有 4GB 内存的 Linux 服务器上使用默认配置运行它。
但是，它已经开始抛出指向内存不足的异常：
Caused by: org.eclipse.rdf4j.repository.RepositoryException: Query evaluation error: Insufficient free Heap Memory 238Mb for group by and distinct, threshold:250Mb, reached 0Mb (HTTP status 500)
at org.eclipse.rdf4j.http.client.SPARQLProtocolSession.execute(SPARQLProtocolSession.java:1143)
at org.eclipse.rdf4j.http.client.SPARQLProtocolSession.executeOK(SPARQLProtocolSession.java:1066)
at org.eclipse.rdf4j.http.client.SPARQLProtocolSession.sendTupleQueryViaHttp(SPARQLProtocolSession.java:834)
at org.eclipse.rdf4j.http.client.SPARQLProtocolSession.getTupleQueryResult(SPARQLProtocolSession.java:763)
at org.eclipse.rdf4j.http.client.SPARQLProtocolSession.sendTupleQuery(SPARQLProtocolSession.java:391)
at org.eclipse.rdf4j.repository.http.HTTPTupleQuery.evaluate(HTTPTupleQuery.java:69)
拜托，你能帮我找出问题所在吗？如何正确配置 GraphDB？
graphdb ×1