Question

我在循环中使用PreparedStatement executeQuery并获得如下的OOM，

java.lang.OutOfMemoryError: GC overhead limit exceeded
    com.mysql.jdbc.MysqlIO.nextRowFast(MysqlIO.java:2267)
    com.mysql.jdbc.MysqlIO.nextRow(MysqlIO.java:2044)
    com.mysql.jdbc.MysqlIO.readSingleRowSet(MysqlIO.java:3549)
    com.mysql.jdbc.MysqlIO.getResultSet(MysqlIO.java:489)
    com.mysql.jdbc.MysqlIO.readResultsForQueryOrUpdate(MysqlIO.java:3240)
    com.mysql.jdbc.MysqlIO.readAllResults(MysqlIO.java:2411)
    com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2834)
    com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2838)
    com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2082)
    com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:2212)
    org.apache.tomcat.dbcp.dbcp.DelegatingPreparedStatement.executeQuery(DelegatingPreparedStatement.java:96)
    org.apache.tomcat.dbcp.dbcp.DelegatingPreparedStatement.executeQuery(DelegatingPreparedStatement.java:96)

每个查询可能会查询大约100条记录，当循环到达第7或第8时，错误就会消失。

代码

Context initCtx = new InitialContext();

Context envCtx = (Context) initCtx.lookup("java:comp/env");

DataSource ds = (DataSource) envCtx.lookup("jdbc/ma30");

Connection conn = ds.getConnection();

PreparedStatement pstmt = conn.prepareStatement(sql);

ResultSet res = pstmt.executeQuery();

有人有想法吗？

OOM使用PreparedStatement在循环中执行Query

0 个答案: