# maybe helps: explicitly use connection poolParallel.each(User.all,in_threads:8)do|user|ActiveRecord::Base.connection_pool.with_connectiondouser.update_attribute(:some_attribute,some_value)endend# maybe helps: reconnect once inside every forkParallel.each(User.all,in_processes:8)do|user|@reconnec...
重要的是_conn( pool.get(_host))这一行代码,它会从池中(pool类型为DBConnectionPool)获取一个链接,如池中没有则会创建一个链接并返回,如下(详情见注释): //connpool.cpp DBClientBase*DBConnectionPool::get(constConnectionString&url) { //从池中获取一个链接对象 DBClientBase*c=_get( url.toString() ...
ShardConnection 是封装从 DBConnectionPool (shardConnectionPool ) 取连接的结构。使用方法如下 ShardConnection conn("myserver") conn->runCommand() 在3.2和3.4版本,重要的CRUD操作中,mongos执行的findAndModify/insert/update/delete等命令都是通过ShardConnection从shardConnectionPool传统连接池取的连接。另外也有个别co...
publicDBConnectionPool(String name, String URL, String user, String password,intmaxConn)//公开的构造函数 publicsynchronizedvoidfreeConnection(Connection con)//使用完毕之后,//把连接返还给空闲池 publicsynchronizedConnection getConnection(longtimeout)//得到一个连接,//timeout是等待时间 publicsynchronizedvoidre...
Java 数据库连接池介绍(3)--DBPool 介绍,DBPool是一个高效易配置的数据库连接池,支持JDBC4.2,但目前已经不维护了;本文简单介绍下DBPool的使用,文中使用到的软件版本:Java1.8.0_191、DBPool7.0.1、SpringBoot2.3.12.RELEASE。1、配置参数参数描述name连
连接池就是在用户量特别多的情况下,创建一个池子存放很多connection连接,等待客户来连接。减少了数据库服务器的创建,节省资源 一、DBCP连接池 DBCP(DataBase Connection Pool),[数据库连接池]。是 apache 上的一个 java 连接池项目,也是 tomcat 使用的连接池组件。单独使用dbcp需要2个包:commons-dbcp.jar,commons-...
When configure Quart to use JDBC Store, you may want to use a DB Connection Pool library to reuse connections to DB. Quartz comes with c3p0 connection pool as default. You can change to other pool provider and add their dependency as well. Using Default c3p0 DB Conn Pool Example: org....
a new connection is always created for every call - this kills performance on heavy load DB url "users.db" is hardcoded - I can't reuse these functions across other projects w/o editing QUESTION 1: how to introduce a pool of connections with some defined (min, max) number of concurrent...
django-db-connection-poolhas more configuration options here:PoolContainer.pool_default_params Here's the explanation of these options(from SQLAlchemy's Doc): pool_size: The size of the pool to be maintained, defaults to 5. This is the largest number of connections that will be kept persisten...
Server MongoDB Client需要和 MongoDB Server建立 Connection; 应用程序处理线程从 Connection Pool中获取 Connection; 数据传输(获取连接后,进行 Socket 通信,获取数据); 断开Collection; MongoDB连接池的参数配置 #线程池允许的最大连接数connectionsPerHost:40#线程池中连接的最大空闲时间threadsAllowedToBlockForConnecti...