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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创建副本集
｜
199
我们需要注意以下几个关键概念。
•
客户端在单台服务器上执行的请求都可以发送到主节点执行（读操作、写操作、执行命
令、创建索引等）。
•
客户端不能在从节点上执行写操作。
•
默认情况下，客户端不能在从节点上读取数据。可以显式地指定“我知道我正在从从节
点中读取数据”来启用此功能。
10.7
更改副本集配置
可以随时更改副本集的配置：添加、删除或者修改成员。很多常用的操作有对应的
shell
辅
助函数。例如，可以使用
rs.add
为副本集添加新成员：
> rs.add("localhost:27020")
类似地，可以从副本集中删除成员：
> rs.remove("localhost:27017")
{ "ok" : 1, "operationTime" : Timestamp(1501202441, 2) }
可以在
shell
中运行
rs.config()
来检查重新配置是否成功。这个命令打印出了当前配置
信息：
> rs.config()
{
"_id" : "mdbDefGuide",
"version" : 3,
"protocolVersion" : NumberLong(1),
"members" : [
{
"_id" : 1,
"host" : "localhost:27018",
"arbiterOnly" : false,
"buildIndexes" : true,
"hidden" : false,
"priority" : 1,
"tags" ...
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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.
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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.