November 2021
Intermediate to advanced
410 pages
12h 1m
Chinese
Content preview from MongoDB权威指南（第3版）
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备份
｜
365
储，于是最终得到的数据快照与原始服务器的状态不一致。
为了避免这种情况，如果运行
mongod
时使用了
--replSet
选项，则可以使用
mongodump
的
--oplog
选项。这会跟踪转储发生时服务器上发生的所有操作，从而在恢复备份时重放
这些操作。这样就可以从源服务器上得到某一时间点的一致性快照。
如果给
mongodump
传递一个副本集的连接字符串
（如
"
setName
/
seed1
,
seed2
,
seed3
"
）， 那
么它会自动选择主节点来进行转储。如果想使用从节点，则可以指定一个读偏好。读偏好
可以通过
--uri
连接字符串、
uri readPreferenceTags
选项或命令行选项
--readPreference
来指定。关于各种设置和选项的详细信息，请参阅
mongodump
的
MongoDB
文档页面。
从
mongodump
备份中恢复需要使用
mongorestore
工具：
$ mongorestore -p 31000 --oplogReplay dump/
如果转储数据库时使用了
--oplog
选项，则运行
mongorestore
时必须使用
--oplogReplay
选项以获取某一时间点的快照。
如果要替换正在运行的服务器上的数据，那么你可能希望（也可能不希望）使用
--drop
选
项，该选项会在恢复一个集合之前先删除它。
随着版本的变化，
mongodump
和
mongorestore
的行为发生了改变
。为了防止兼容性问题，
最好使用这两个实用程序的相同版本。（可以运行
mongodump --version ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.