如何在Solr中解决java堆空间内存不足的问题

I am using Apache Solr version 4.6.0. I am getting out of memory exception when querying for name field. I am not very familiar with solr. I use it to search name . the core contains about 47M names. If anybody has encountered similar error, please share how you solved it. the error message is :I am using Apache Solr version 4.6.0. I am gett