标签：sele http rop targe char dep red .post tst
前几天看了一篇文章<High Performance JSON PostgreSQL vs. MongoDB> 发布在Percona Live Europe 2017
作者是<Dominic Dwyer Wei Shan Ang>,作者的观点是PostgreSQL更好，恰巧没有玩过postgresql，仅仅听说过。
码农的第一特征就是相信实验，故postgresql走起
上一篇文章<mongodb索引--1亿条记录的查询从55.7秒到毫秒级别> 我们做了一个mongo的实验
>>插入1亿条记录，约耗时1个小时
>>无索引查询一条记录耗时为55.7秒
>>有索引查询一条记录耗时小于1秒
1.去官网下载psotgresql :https://www.postgresql.org/
下载最新版本11.1 windows安装，step by step
2.客户端，我选了pgadmin:https://www.pgadmin.org/
下载最新版本v3.6 windows安装，step by step
3.创建新的数据库www
4.创建新表
/* String sql = "CREATE TABLE PERSON " + "(ID INT PRIMARY KEY NOT NULL," + " NAME TEXT NOT NULL, " + " AGE INT NOT NULL, " + " ADDRESS CHAR(50), " + " SALARY REAL)"; stmt.executeUpdate(sql);*/
5.插入1亿条记录
java client 依赖包
<dependency> <groupId>org.postgresql</groupId> <artifactId>postgresql</artifactId> <version>42.2.5</version> </dependency>
java程序
public void postgresqlOneByOneInsert() { try { long start=System.currentTimeMillis(); Class.forName("org.postgresql.Driver"); Connection connection = DriverManager.getConnection("jdbc:postgresql://127.0.0.1:5432/www", "postgres", "root"); PreparedStatement stmt = connection.prepareStatement("INSERT INTO PERSON(ID,NAME,AGE,ADDRESS,SALARY) values(?,?,?,?,?);"); for(int i=0;i<100000000;i++) { stmt.setInt(1, i+1); stmt.setString(2, "mkyong"+i); stmt.setInt(3, i%100); stmt.setString(4, "address"+i); stmt.setFloat(5, 25000.00f); stmt.executeUpdate(); } /* String sql = "CREATE TABLE PERSON " + "(ID INT PRIMARY KEY NOT NULL," + " NAME TEXT NOT NULL, " + " AGE INT NOT NULL, " + " ADDRESS CHAR(50), " + " SALARY REAL)"; stmt.executeUpdate(sql);*/ /* ResultSet rs = stmt.executeQuery( "SELECT * FROM STUDENT;" ); while ( rs.next() ) { int id = rs.getInt("sid"); String name = rs.getString("name"); System.out.println( "ID = " + id ); System.out.println( "NAME = " + name );; System.out.println(); } rs.close();*/ stmt.close(); connection.close(); System.out.println("耗时:"+(System.currentTimeMillis()-start)+" 毫秒"); } catch (ClassNotFoundException e) { e.printStackTrace(); } catch (SQLException e) { e.printStackTrace(); } }
然后是漫长的时间等待插入完成
标签：sele http rop targe char dep red .post tst
原文地址：https://www.cnblogs.com/davidwang456/p/10190319.html
