使用jdbc测了一下sqlite3的插入数据的效率，使用整体事务与不使用整体事务，差别非常明显。 cpu: 1G, 内存：512MB
使用整体事务：1000000条记录，需要93秒钟。
使用逐个插入提交事务：1秒钟只能处理20条记录。
启动程序时把java堆最大空间设大一些，不然可能出现内存不够的异常。
java -Xmx256M TestConn
测试后的结果显示如下：
以下是测试代码：
import java.sql.*;
public class TestConn {
void test(){
Connection conn = null;
Statement stmt = null;
ResultSet rset = null;
System.out.println(new java.util.Date());
try {
Class.forName("SQLite.JDBCDriver");
conn = DriverManager.getConnection(
"jdbc:sqlite:/f:/test.db", //jdbc:oracle:thin:@hex:1521:ORCL
"",
"");
conn.setAutoCommit(false);
stmt = conn.createStatement();
stmt.executeUpdate("create table hehe(id number, name varchar(32))");
System.out.println("建表hehe成功!");
for (int i=0; i<1000000; i++)
{
stmt.executeUpdate("INSERT INTO hehe VALUES("+i+", '我爱中国"+i+"')");
}
conn.commit();
System.out.println("不建索引查询:");
System.out.println(new java.util.Date());
rset = stmt.executeQuery("SELECT id, name FROM hehe where id > 499999 and name ='我爱中国500001'");
if (rset.next()){
System.out.println(rset.getInt("id"));
System.out.println(rset.getString("name"));
}
if (rset!=null){ rset.close(); rset = null; }
System.out.println(new java.util.Date());
System.out.println("建索引:");
System.out.println(new java.util.Date());
stmt.executeUpdate("CREATE INDEX hehe_idx on hehe(id)");
stmt.executeUpdate("CREATE INDEX hehe_idx2 on hehe(name)");
conn.commit();
System.out.println(new java.util.Date());
System.out.println("建索引后的查询:");
System.out.println(new java.util.Date());
rset = stmt.executeQuery("SELECT id, name FROM hehe where id > 499999 and name = '我爱中国500001'");
if (rset.next()){
System.out.println(rset.getInt("id"));
System.out.println(rset.getString("name"));
}
System.out.println(new java.util.Date());
stmt.executeUpdate("drop table hehe");
System.out.println("删除表hehe成功!");
conn.commit();
System.out.println(new java.util.Date());
} catch(ClassNotFoundException cnfe) {
System.out.println("Can't find class for driver: "+cnfe.getMessage());
System.exit(-1);
} catch (SQLException e){
System.out.println(e.getMessage());
System.exit(-1);
} finally
{
try {
if (rset!=null) rset.close();
stmt.close();
conn.close();
} catch (SQLException e) {
}
}
}
public static void main(String[] args) {
TestConn conn = new TestConn();
conn.test();
}
}
