八月未央

用户及角色管理(上) db版本2.6.4 系统内建角色如下 Database User Roles: read  readWrite Database Administration Roles: dbAdmin dbOwner userAdmin Cluster Administration Roles: clusterAmin clusterManager

1.Restart a Secondary in Standalone Mode on a Different Port db.shutdownServer() mongod --port 37017 --dbpath /data/standby 2.Create a Backup of the Oplog (Optional) mongodump --db local --

1.If your application is connecting directly to the secondary, modify the application so that MongoDB queries don’t reach the secondary. 2.Shut down the secondary. 3.Remove the secondary from the re

环境准备: 搭建3台虚拟机 保证3台互通 在每台/etc/hosts添加主机名 ip记录即可 host1：primary host2: standby host3: mail 1.分别启动mongod实例,rs名字为 rs0 mongod --replSet "rs0" --dbpath /data/primary mongod --replSet "rs0" --dbpath /da

1.修改成员priority The value of priority can be any floating point (i.e. decimal) number between 0 and 1000. The default value for the priority field is 1.The higher the number, the higher the priority.

1. 不已认证方式启动数据库 # mongod 2.在admin数据库下创建管理test数据库的用户root > use admin switched to db admin > db.createUser( ... { ... user: "root", ... pwd: "redhat", ... roles: ... [ ... { ...

The mongo shell and the MongoDB drivers use Acknowledged as the default write concern. //mongo shell和monogdb驱动将Acknowledged 作为默认的写安全级别 Read Isolation(读隔离) MongoDB allows clients to read documents ins

1.查看容器中的所有文档 db.inventory.find() { "_id" : ObjectId("5446ebddd251b112db5bf7bc"), "item" : "ABC1", "details" : {"model" : "14Q3","manufacturer" : "XYZ Company"}, "stock" : [ { "size" : "S", "q

一：插入数据 1.直接插入 db.inventory.insert( { item: "ABC1", details: { model: "14Q3", manufacturer: "XYZ Company" }, stock: [ { size: "S", qty: 25 }, { size: "M", qty: 5

1.创建角色 use admin db.createRole({ role: "myRole",   privileges: [     { resource: { cluster: true }, actions: [ "addShard" ] },     { resource: { db: "local", collection: "" }, actions: [ "insert"

mongodb针对不同操作系统有不同的安装包，直接解压就可以用将mongodb/bin加入到环境变量中方便使用 通过mongod -h可以查看使用说明，通常通过一个配置文件来启动，那样更方便和灵活 举例如下： cat mongod.conf  dbpath = /Users/ranyuan/Desktop/mongodb/data //数据文件存放位置 logpa

复制集的概念篇： 复制集:Replica Set,一个复制集中只能有一个primary set,一个复制中最多有12个成员,并且最多只有7个能同时投票。 成员分类： 1.Replica Set Priamry：接受所有写操作,也可以是所有读操作。 2.Replica Set Secondary Members ：应用Priamry的oplog日志来复制数据,