老是update一个数组时发生oom，数据量最多几千个吧，java堆内存已经不能再调大了，有啥好的解决方法呢？

Caused by: java.lang.OutOfMemoryError: Java heap space
	at sun.reflect.GeneratedConstructorAccessor11.newInstance(Unknown Source)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
	at com.mysql.jdbc.Util.handleNewInstance(Util.java:425)
	at com.mysql.jdbc.ResultSetImpl.getInstance(ResultSetImpl.java:319)
	at com.mysql.jdbc.MysqlIO.buildResultSetWithUpdates(MysqlIO.java:3194)
	at com.mysql.jdbc.MysqlIO.readResultsForQueryOrUpdate(MysqlIO.java:3094)
	at com.mysql.jdbc.MysqlIO.readAllResults(MysqlIO.java:2341)
	at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2736)
	at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2501)
	at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1858)
	at com.mysql.jdbc.PreparedStatement.executeUpdateInternal(PreparedStatement.java:2079)
	at com.mysql.jdbc.PreparedStatement.executeBatchSerially(PreparedStatement.java:1756)
	at com.mysql.jdbc.PreparedStatement.executeBatchInternal(PreparedStatement.java:1262)
	at com.mysql.jdbc.StatementImpl.executeBatch(StatementImpl.java:958)
	at com.alibaba.druid.filter.FilterChainImpl.statement_executeBatch(FilterChainImpl.java:2596)
	at com.alibaba.druid.filter.FilterAdapter.statement_executeBatch(FilterAdapter.java:2474)
	at com.alibaba.druid.filter.FilterEventAdapter.statement_executeBatch(FilterEventAdapter.java:279)
	at com.alibaba.druid.filter.FilterChainImpl.statement_executeBatch(FilterChainImpl.java:2594)
	at com.alibaba.druid.wall.WallFilter.statement_executeBatch(WallFilter.java:486)
	at com.alibaba.druid.filter.FilterChainImpl.statement_executeBatch(FilterChainImpl.java:2594)
	at com.alibaba.druid.proxy.jdbc.StatementProxyImpl.executeBatch(StatementProxyImpl.java:192)
	at com.alibaba.druid.pool.DruidPooledPreparedStatement.executeBatch(DruidPooledPreparedStatement.java:559)
	at org.nutz.dao.impl.sql.run.NutDaoExecutor._runPreparedStatement(NutDaoExecutor.java:322)
	at org.nutz.dao.impl.sql.run.NutDaoExecutor.exec(NutDaoExecutor.java:90)
	at org.nutz.dao.DaoInterceptorChain.doChain(DaoInterceptorChain.java:66)
	at org.nutz.dao.impl.interceptor.DaoLogInterceptor.filter(DaoLogInterceptor.java:22)
	at org.nutz.dao.DaoInterceptorChain.doChain(DaoInterceptorChain.java:64)
	at org.nutz.dao.DaoInterceptorChain.invoke(DaoInterceptorChain.java:139)
	at org.nutz.dao.impl.sql.run.NutDaoRunner.runCallback(NutDaoRunner.java:158)
	at org.nutz.dao.impl.sql.run.NutDaoRunner._runWithoutTransaction(NutDaoRunner.java:125)
	at org.nutz.dao.impl.sql.run.NutDaoRunner._run(NutDaoRunner.java:92)