AFAIK，Tomcat与管理数据库连接无关。从Grails
2.3.6开始，以下是推荐的默认数据源属性：
properties { //see http://grails.org/doc/latest/guide/conf.html#dataSource for documentation jmxEnabled = true initialSize = 5 maxActive = 50 minIdle = 5 maxIdle = 25 maxWait = 10000 maxAge = 10 * 60000 timeBetweenEvictionRunsMillis = 5000 minEvictableIdleTimeMillis = 60000 validationQuery = "SELECT 1" validationQueryTimeout = 3 validationInterval = 15000 testonBorrow = true testWhileIdle = true testonReturn = false jdbcInterceptors = "ConnectionState;StatementCache(max=200)" defaultTransactionIsolation = java.sql.Connection.TRANSACTION_READ_COMMITTED}
