MongoDB整库备份+整库导入

备份前检查：

[root@Load29 tmp]# mongo localhost:25019
MongoDB shell version: 3.2.10
connecting to: localhost:25019/test
Server has startup warnings:
2017-07-21T01:27:54.413+0800 I CONTROL  [initandlisten] ** WARNING: You are running this process as the root user, which is not recommended.
2017-07-21T01:27:54.413+0800 I CONTROL  [initandlisten]
2017-07-21T01:27:54.414+0800 I CONTROL  [initandlisten]
2017-07-21T01:27:54.414+0800 I CONTROL  [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/defrag is 'always'.
2017-07-21T01:27:54.414+0800 I CONTROL  [initandlisten] **        We suggest setting it to 'never'
2017-07-21T01:27:54.414+0800 I CONTROL  [initandlisten]
> show dbs;
admin  0.000GB
local  0.000GB
test   0.005GB
>

整库备份：

[root@Load29 ~]# mongodump -h localhost:25019 -d test -o /tmp

-h MongDB服务器地址

-d 数据库实例名称

-o 导出数据存放目录

-drop 恢复数据时会先删除当前数据

删除old_dbname: 

>use old_dbname
>db.dropDatabase()

整库还原：

[root@Load29 ~]# mongorestore -h localhost:25019 -d test -directoryperdb /tmp/test --drop

[root@Load29 ~]# mongorestore -h localhost:27017 -u xxx-p xxxx--authenticationDatabase "admin" -d test --drop ./test　

数据库重命名：

>db.copyDatabase('old_dbname', 'new_dbname'); 
>use old_dbname 
>db.dropDatabase();

导出具体某个字段：

[root@Load29 ~]# mongoexport -h localhost:25019 -d test -c share_order -f shareOrderId -o /tmp/shareid.csv
2017-07-28T19:14:07.116+0800    connected to: localhost:25019
2017-07-28T19:14:07.605+0800    exported 49367 records

-c 指定表（即collection） 

-f 指定column字段导出（即field）

导出某个集合：

 mongoexport -h 127.0.0.1:25019 -u aijia -p aijia1234567 --authenticationDatabase "admin" -d test  -c app_product_comment -o comment.json

导入某个集合：

mongoimport --host localhost --port 25019 --username aijia --password aijia1234567 --authenticationDatabase "admin" --collection app_product_comment --db test --file comment.json