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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入门指南
｜
9
•
数据库名称区分大小写。
•
数据库名称的长度限制为
64
字节。
在
MongoDB
使用
W
iredTiger
存储引擎之前，数据库名称会对应文件系统中的文件名。尽
管现在已经不这样处理了，但之前的许多限制遗留了下来。
此外，还有一些数据库名称是保留的。这些数据库可以被访问，但它们具有特殊的语义。
具体如下。
admin
admin
数据库会在身份验证和授权时被使用
。此外，某些管理操作需要访问此数据库。
有关
admin
数据库的更多信息，请参阅第
19
章。
local
特定于单个服务器的数据会存储在此数据库中。在副本集中，
local
用于存储复制过程
中所使用的数据，而
local
数
据库本身不会被复制。（有关复制和
local
数据库的详细信
息，请参阅第
10
章
。）
config
MongoDB
的分片集群（参见第
14
章）会使用
config
数据库存储关于每个分片的信息。
通过将数据库名称与该库中的集合名称连接起来，可以获得一个完全限定的集合名称，称
为
命名空间
。如果你要使用
cms
数据库中的
blog.posts
集合
，则该集合的命名空间为
cms.
blog.posts
。命名空间的长度限制为
120
字节
，而实际使用时应该小于
100
字节。有关
MongoDB
中命名空间和集合内部表示的更多信息，请参阅附录
B
。
2.4
启动
MongoDB
要启动
MongoDB
服务器端，请在
Unix
命令行环境中运行
mongod
可执行文件：
$ mongod
2016-04-27T22:15:55.871-0400 I CONTROL [initandlisten] ...
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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.