<转>quartz 2.2.1 jdbc 连接池参数配置

线上数据库出现mysql 8小时异常.需要增加如下配置:

org.quartz.dataSource.QRTZ_DS.idleConnectionValidationSeconds=60
org.quartz.dataSource.QRTZ_DS.validateOnCheckout=true
org.quartz.dataSource.QRTZ_DS.discardIdleConnectionsSeconds=0

增加后问题解决.

转载:http://www.cnblogs.com/snowlove67/p/4958406.html

参考:（quartz和数据库断连接的解决办法）

http://blog.csdn.net/bewilderment/article/details/47951269

/** The JDBC database driver. */指定连接驱动
public static final String DB_DRIVER = "driver";

/** The JDBC database URL. */  连接字符串
public static final String DB_URL = "URL";

/** The database user name. */ 用户名
public static final String DB_USER = "user";

/** The database user password. */ 密码
public static final String DB_PASSWORD = "password";

/** The maximum number of database connections to have in the pool.  Default is 10. */ 连接池最大连接数
public static final String DB_MAX_CONNECTIONS = "maxConnections";

/**
* The maximum number of prepared statements that will be cached per connection in the pool.
* Depending upon your JDBC Driver this may significantly help performance, or may slightly
* hinder performance.
* Default is 120, as Quartz uses over 100 unique statements. 0 disables the feature.
*/     每个链接最多缓存多少个预编译语句
public static final String DB_MAX_CACHED_STATEMENTS_PER_CONNECTION = "maxCachedStatementsPerConnection";

/**
* The database sql query to execute every time a connection is returned
* to the pool to ensure that it is still valid.
*/  验证连接是否可用的查询语句
public static final String DB_VALIDATION_QUERY = "validationQuery";

/**
* The number of seconds between tests of idle connections - only enabled
* if the validation query property is set.  Default is 50 seconds.
*/   多久验证空闲连接
public static final String DB_IDLE_VALIDATION_SECONDS = "idleConnectionValidationSeconds";

/**
* Whether the database sql query to validate connections should be executed every time
* a connection is retrieved from the pool to ensure that it is still valid.  If false,
* then validation will occur on check-in.  Default is false.
*/  是否每次从池中取连接时，验证连接可用性
public static final String DB_VALIDATE_ON_CHECKOUT = "validateOnCheckout";

/** Discard connections after they have been idle this many seconds.  0 disables the feature. Default is 0.*/   空闲连接超过多少秒丢弃
private static final String DB_DISCARD_IDLE_CONNECTIONS_SECONDS = "discardIdleConnectionsSeconds";

/** Default maximum number of database connections in the pool. */  最大连接数
public static final int DEFAULT_DB_MAX_CONNECTIONS = 10;

/** Default maximum number of database connections in the pool. */   默认每个链接缓存120个预编译语句
public static final int DEFAULT_DB_MAX_CACHED_STATEMENTS_PER_CONNECTION = 120;

quartz连接池配置对C3PO连接池配置进行了一些封装， 留作记录。

mysql 断开连接可以通过设置 validateOnCheckout=true + validationQuery

或者设置discardIdleConnectionsSeconds 少于8小时解决。