mongdb add index

1、cd 到mongdb目录
2、bin/mongo
3、use event
4、db.ogg_event_current.ensureIndex({"alertKey":-1})
5、db.ogg_event_current.ensureIndex({"severity":1})

[root@localhost ~]# cd /opt/mongodb-linux-x86_64-rhel70-3.2.9/
[root@localhost mongodb-linux-x86_64-rhel70-3.2.9]# bin/mongo
MongoDB shell version: 3.2.9
connecting to: test
Server has startup warnings:
2017-09-14T16:45:11.375+0800 I CONTROL  [initandlisten] ** WARNING: You are running this process as the root user, which is not recommended.
2017-09-14T16: 45: 11.375+0800 I CONTROL [initandlisten]
2017-09-14T16: 45: 11.376+0800 I CONTROL [initandlisten]
2017-09-14T16:45:11.376+0800 I CONTROL  [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/enabled is 'always'.
2017-09-14T16:45:11.376+0800 I CONTROL  [initandlisten] **        We suggest setting it to 'never'
2017-09-14T16: 45: 11.376+0800 I CONTROL [initandlisten]
2017-09-14T16:45:11.376+0800 I CONTROL  [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/defrag is 'always'.
2017-09-14T16:45:11.376+0800 I CONTROL  [initandlisten] **        We suggest setting it to 'never'
2017-09-14T16: 45: 11.376+0800 I CONTROL [initandlisten]

Switch to the corresponding collections

> show dbs
databaseName  0.000GB
event         0.233GB
local         0.000GB
test          0.000GB
> use event
switched to db event

View current database

> db
event

View table

> show collections
default_event_exception
groovy_script
informatica_event_current
informatica_event_history
ogg_event_current
ogg_event_history
raw_message
summary_chinese_match

new index

> db.ogg_event_current.ensureIndex({"alertKey":-1})
{
        "createdCollectionAutomatically" : false,
        "numberIndexesBefore": 2,
        "numIndexesAfter": 3,
        "ok" : 1
}
> db.ogg_event_current.ensureIndex({"severity":1})
{
        "createdCollectionAutomatically" : false,
        "numberIndexesBefore": 3,
        "numIndexesAfter": 4,
        "ok" : 1
}

view index

> db.ogg_event_current.getIndexes()
[
        {
                "v" : 1,
                "key" : {
                        "_id" : 1
                },
                "name" : "_id_",
                "ns" : "event.ogg_event_current"
        },
        {
                "v" : 1,
                "key" : {
                        "alertKey" : -1
                },
                "name" : "alertKey_-1",
                "ns" : "event.ogg_event_current"
        },
        {
                "v" : 1,
                "key" : {
                        "alertKey" : 1
                },
                "name" : "alertKey_1",
                "ns" : "event.ogg_event_current"
        },
        {
                "v" : 1,
                "key" : {
                        "severity" : 1
                },
                "name" : "severity_1",
                "ns" : "event.ogg_event_current"
        }
]

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