Database activemq-datalocalhostKahaDBlock is locked...

因为你安装activemq服务默认是随系统启动的，所以你一开机activemq服务器就启动了，启动后就锁定了activemq的数据库，所以如果你再次启动的话就会报数据库被锁定的错误

解决办法一：停止activemq服务，再手动启动(多次一举，因为本来就启动了)

解决办法二：配置activemq服务为手动启动，这样activemq服务就不会随系统启动了，每次要自己启动activemq服务

ActiveMQ另问题要软件能挂掉挂掉怕怕挂掉信息给丢所本节析几种持久化式：

、持久化文件

ActiveMQ默认支持种式要发消息设置消息持久化

打安装目录配置文件：

D:\ActiveMQ\apache-activemq\conf\activemq.xml越80行发现默认配置项：

注意使用kahaDB基于文件支持事务消息存储器靠高性能扩展消息存储器

设计初衷使用简单并尽能快KahaDB索引使用transaction log并且所destination使用index测试表明：用于产环境支持1万active connection每connection独立queue该表现已经足矣应付部需求

再发送消息候改变第二参数：

MsgDeliveryMode.Persistent

Message保存式2种

PERSISTENT：保存磁盘consumer消费message删除

NON_PERSISTENT：保存内存消费message清除

注意：堆积消息太能导致内存溢

打产者端发送消息：

wps30F4.tmp

启消费者端同管理界面查看：

wps3105.tmp

发现消息等待没持久化ActiveMQ宕机重启消息丢失我现修改文件持久化重启ActiveMQ消费者仍能够收消息

wps3106.tmp

二、持久化数据库

我支持Mysql例先载mysql-connector-java-5.1.34-bin.jar包放：

D:\ActiveMQ\apache-activemq\lib目录

打并修改配置文件：

复制代码

<beans

xmlns=""

xmlns:xsi=""

xsi:schemaLocation=" /spring-beans.xsd

/activemq-core.xsd">

file:${activemq.conf}/credentials.properties

<bean id="logQuery" class="org.fusesource.insight.log.log4j.Log4jLogQuery"

lazy-init="false" scope="singleton"

init-method="start" destroy-method="stop">

<!--

The element is used to configure the ActiveMQ broker.

-->

<!-- The constantPendingMessageLimitStrategy is used to prevent

slow topic consumers to block producers and affect other consumers

by limiting the number of messages that are retained

For more information, see:

-->

<!--

The managementContext is used to configure how ActiveMQ is exposed in

JMX. By default, ActiveMQ uses the MBean server that is started by

the JVM. For more information, see:

-->

<!--

Configure message persistence for the broker. The default persistence

mechanism is the KahaDB store (identified by the kahaDB tag).

For more information, see:

-->

<!--

The systemUsage controls the maximum amount of space the broker will

use before disabling caching and/or slowing down producers. For more information, see:

-->

<!--

The transport connectors expose ActiveMQ over a given protocol to

clients and other brokers. For more information, see:

-->

<!--

Enable web consoles, REST and Ajax APIs and demos

The web consoles requires by default login, you can disable this in the jetty.xml file

Take a look at ${ACTIVEMQ_HOME}/conf/jetty.xml for more details

-->

J

---