hikaricp

create a connection pool for many DBs on the same DB server (Spring Boot)

旧时模样 提交于 2020-04-18 05:43:32
问题 I'm looking for a way to create a connection pool for many DBs on the same DB server (PostgreSQL Aurora). This means that I need the ability of changing the target DB of a connection at run time. Currently I'm using HikariCP for connection pooling, in a stack of Spring Boot and JHispter. Background: we need to deploy a multi-tenancy micro-service system with a single DB server (to be specific, a single AWS Aurora PostgreSQL instance) our solution of multi-tenancy is that each tenant has a DB,

Java 数据持久化系列之 HikariCP (一)

白昼怎懂夜的黑 提交于 2020-04-15 11:57:12
【推荐阅读】微服务还能火多久?>>> 在上一篇 《Java 数据持久化系列之池化技术》 中,我们了解了池化技术,并使用 Apache-common-Pool2 实现了一个简单连接池,实验对比了它和 HikariCP、Druid 等数据库连接池的性能数据。在性能方面,HikariCP遥遥领先,而且它还是 Spring Boot 2.0 默认的数据库连接池。下面我们就来了解一下这款明星级开源数据库连接池的实现。 本文的主要内容包括: HikariCP 简介,介绍它的特性和现况。 HikariCP 的配置项详解,分析部分配置的影响。 HikariCP 为什么这么快,介绍其优化点。 这里啰嗦两句,由于本系列会涉及很多开源项目,比如说 HikariCP、Druid、Mybatis等,所以简单聊一下我对学习开源项目的认识,这也是我自己行文或者组织系列文章顺序的思路,后续有时间再详细总结一下。 安装并检查提供的所有工具,比如 Redis 目录下的 redis-check-aof 等工具的作用,这些工具都是官方特意提供的,一般都是日常经常要使用的,了解其功能。 运行,学习所有配置项的功能,原理和优缺点,比如 Redis 的内存溢出控制策略 maxmemory-policy 的可选值都有哪些,分别对应的策略是什么含义,适用于哪些场景等。 原理研究,针对关键特性进行研究,比如 Netty 的异步

How to configure hikari pool for eager initialization?

一笑奈何 提交于 2020-03-17 12:04:09
问题 I want to configure the Hikari pool to eagerly initialize on application startup and not when first query is issued. As of now spring initializr project shows that hikari pool is provisioned on first query. To reproduce issue - Create spring initializr project with web, jdbc and mysql dependency. Hikari pool is only created after GET request to controller application.properties spring.datasource.url= spring.datasource.driver-class-name= spring.datasource.username= spring.datasource.password=

Spring Boot JDBC Examples

主宰稳场 提交于 2020-02-28 04:52:39
In this tutorial, we will show you how to use Spring Boot JDBC JdbcTemplate and NamedParameterJdbcTemplate . Technologies used : Spring Boot 2.1.2.RELEASE Spring JDBC 5.1.4.RELEASE HikariCP 3.2.0 H2 in-memory database 1.4.197 Maven 3 Java 8 In Spring Boot JDBC, the database related beans like DataSource , JdbcTemplate and NamedParameterJdbcTemplate will be configured and created during the startup, to use it, just @Autowired the bean you want, for examples: @Autowired JdbcTemplate jdbcTemplate ; @Autowired private NamedParameterJdbcTemplate jdbcTemplate ; To connect to a database (e.g MySQL),

Spring Boot 2.x基础教程:默认数据源Hikari的配置详解

情到浓时终转凉″ 提交于 2020-02-26 07:19:13
通过 上一节 的学习,我们已经学会如何应用Spring中的 JdbcTemplate 来完成对MySQL的数据库读写操作。接下来通过本篇文章,重点说说在访问数据库过程中的一个重要概念:数据源(Data Source),以及Spring Boot中对数据源的创建与配置。 基本概念 在开始说明Spring Boot中的数据源配置之前,我们先搞清楚关于数据访问的这些基本概念: 什么是JDBC? Java数据库连接(Java Database Connectivity,简称JDBC)是Java语言中用来规范客户端程序如何来访问数据库的应用程序接口,提供了诸如查询和更新数据库中数据的方法。JDBC也是Sun Microsystems的商标。我们通常说的JDBC是面向关系型数据库的。 JDBC API主要位于JDK中的 java.sql 包中(之后扩展的内容位于 javax.sql 包中),主要包括(斜体代表接口,需驱动程序提供者来具体实现): DriverManager:负责加载各种不同驱动程序(Driver),并根据不同的请求,向调用者返回相应的数据库连接(Connection)。 Driver:驱动程序,会将自身加载到DriverManager中去,并处理相应的请求并返回相应的数据库连接(Connection)。 Connection:数据库连接,负责与进行数据库间通讯

HikariPool-1 - Failed to validate connection org.postgresql.jdbc.PgConnection@2a84e649 (This connection has been closed.)

我们两清 提交于 2020-01-24 21:49:27
问题 I'm using Postgresql and spring boot 2.0.4. The below error is thrown when trying to execute the queries one after the other. I've executed the following query, and the count keeps on increasing. SELECT COUNT(*) FROM pg_stat_activity WHERE state ILIKE '%idle%'; I've used these properties and dependencies for connection pool. Yet, it gives the same error spring.datasource.dbcp2.initial-size=10 spring.datasource.dbcp2.max-total=25 spring.datasource.dbcp2.pool-prepared-statements=true spring

Spring Boot - Reconnect to a database after its restart

不打扰是莪最后的温柔 提交于 2020-01-24 21:48:26
问题 I have an Spring Batch application, which runs every 10 minutes. It gets some data from a REST API and then it saves these data on a database. Well, where is my problem now? Sometimes the database (Oracle) may restart, or go offline (no idea, really). But the application doesn't seem to reconnect to the database. It just stays on an idle mode. Spring Boot: 2.1.2.RELEASE The application.yml looks like this: app: database: jdbc-url: jdbc:oracle:thin:@<host>:<port>:<db> username: <username>

Spring Boot - Reconnect to a database after its restart

末鹿安然 提交于 2020-01-24 21:48:09
问题 I have an Spring Batch application, which runs every 10 minutes. It gets some data from a REST API and then it saves these data on a database. Well, where is my problem now? Sometimes the database (Oracle) may restart, or go offline (no idea, really). But the application doesn't seem to reconnect to the database. It just stays on an idle mode. Spring Boot: 2.1.2.RELEASE The application.yml looks like this: app: database: jdbc-url: jdbc:oracle:thin:@<host>:<port>:<db> username: <username>

How I can use FlexyPool with HikariCPFactory?

白昼怎懂夜的黑 提交于 2020-01-24 09:00:52
问题 I want measure metrics on my datasource comparing HikariCP and C3pO. I don’t understand how I can use FlexyPool in my project. I have Tomcat context.xml and HikariCP: <Resource name="jdbc/dictionaryDB" auth="Container" factory="com.zaxxer.hikari.HikariJNDIFactory" type="javax.sql.DataSource" driverClassName="org.postgresql.Driver" jdbcUrl="jdbc:postgresql://localhost:5432/deversdb" username="user" password="pass" maxActive="8" maxIdle="4"/> Please help me, i’am very newbie in connection

HikariPool-1 - Connection is not available, request timed out after

隐身守侯 提交于 2020-01-23 06:59:32
问题 I'm using HikariCP 2.4.7 for connection pool. Everything is fine just after starting the application but after some time without invoking getConnection() I get this error when I'm trying to getConnection() : java.sql.SQLTransientConnectionException: HikariPool-1 - Connection is not available, request timed out after 42734ms. at com.zaxxer.hikari.pool.HikariPool.createTimeoutException(HikariPool.java:555) at com.zaxxer.hikari.pool.HikariPool.getConnection(HikariPool.java:188) at com.zaxxer