ActiveMQ的用途是什么-我们可以使用数据库应用消息传递概念吗？ [英] What is ActiveMQ used for - can we apply messaging concept using a Database?

问题描述

我查了一下，它曾经在两个系统之间发送消息。

但是为什么呢？为什么不只使用数据库？

必须具有 ActiveMQ 的某些功能数据库是否没有？

I looked it up and it used to send messages between 2 systems.
But why? Why wouldn't you just use a Database?
There must be some feature that ActiveMQ has that Databases do not?

推荐答案

用于可靠地通信在两个分布式进程之间。

It is used to reliably communicate between two distributed processes.

是的，您可以将消息存储在数据库中，以便在两个进程之间进行通信，但是，一旦收到消息，您就可以来<< c $ c> Delete 消息，这意味着一行 INSERT 和 DELETE 用于每条消息。

当您尝试扩展以使每秒传输数千条消息时，数据库往往会崩溃

Yes, you could store messages in a Database to communicate between two processes, but, as soon as the message is received you'd have to DELETE the message, That means a row INSERT and DELETE for each message.
When you try to scale that up communicating thousands of messages per second, Databases tend to fall over.

另一方面，像 ActiveMQ 这样的面向消息的中间件[MOM]则可以处理这些用例。

他们假设运行状况良好的系统中的邮件将被迅速删除，并且可以进行优化以避免开销。

Message-oriented middle-ware [MOM] like ActiveMQ on the other hand are built to handle those use cases.
They assume that messages in a healthy system will be deleted very quickly and can do optimizations to avoid the overhead.

它还可以将消息推送给使用者，而不是使用者必须通过执行SQL查询来轮询新消息。

进一步减少了处理发送到系统中的新消息所涉及的延迟。

It can also push messages to consumers instead of a consumer having to poll for the new message by doing a SQL query.
This further reduces the latency involved in processing new messages being sent into the system.

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