> help
db.help() help on db methods
db.mycoll.help() help on collection methods
sh.help() sharding helpers
rs.help() replica set helpers
help admin administrative help
help connect connecting to a db help
help keys key shortcuts
help misc misc things to know
help mr mapreduce
show dbs show database names
show collections show collections in current database
show users show users in current database
show profile show most recent system.profile entries with time >= 1ms
show logs show the accessible logger names
show log [name] prints out the last segment of log in memory, 'global' is default
use <db_name> set current database
db.foo.find() list objects in collection foo
db.foo.find( { a : 1 } ) list objects in foo where a == 1
it result of the last line evaluated; use to further iterate
DBQuery.shellBatchSize = x set default number of items to display on shell
exit quit the mongo shell
> show dbs;
admin (empty)
ceilometer 0.953125GB
local 0.078125GB
> use ceilometer
switched to db ceilometer
> show collections
alarm
alarm_history
event
meter
resource
system.indexes
system.users
> db.system.indexes.find()
{ "v" : 1, "key" : { "_id" : 1 }, "ns" : "ceilometer.system.users", "name" : "_id_" }
{ "v" : 1, "key" : { "user" : 1, "userSource" : 1 }, "unique" : true, "ns" : "ceilometer.system.users", "name" : "user_1_userSource_1" }
{ "v" : 1, "key" : { "_id" : 1 }, "ns" : "ceilometer.resource", "name" : "_id_" }
{ "v" : 1, "key" : { "_id" : 1 }, "ns" : "ceilometer.meter", "name" : "_id_" }
{ "v" : 1, "key" : { "user_id" : 1, "source" : 1 }, "ns" : "ceilometer.resource", "background" : false, "name" : "resource_idx" }
{ "v" : 1, "key" : { "resource_id" : 1, "user_id" : 1, "counter_name" : 1, "timestamp" : 1, "source" : 1 }, "ns" : "ceilometer.meter", "background" : false, "name" : "meter_idx" }
{ "v" : 1, "key" : { "project_id" : 1, "source" : 1 }, "ns" : "ceilometer.resource", "background" : true, "name" : "resource_project_idx" }
{ "v" : 1, "key" : { "resource_id" : 1, "project_id" : 1, "counter_name" : 1, "timestamp" : 1, "source" : 1 }, "ns" : "ceilometer.meter", "background" : true, "name" : "meter_project_idx" }
{ "v" : 1, "key" : { "last_sample_timestamp" : -1 }, "ns" : "ceilometer.resource", "sparse" : true, "name" : "last_sample_timestamp_idx" }
{ "v" : 1, "key" : { "timestamp" : -1 }, "ns" : "ceilometer.meter", "name" : "timestamp_idx" }
{ "v" : 1, "key" : { "_id" : 1 }, "ns" : "ceilometer.event", "name" : "_id_" }
{ "v" : 1, "key" : { "_id" : 1 }, "ns" : "ceilometer.alarm", "name" : "_id_" }
{ "v" : 1, "key" : { "_id" : 1 }, "ns" : "ceilometer.alarm_history", "name" : "_id_" }
> db.meter.find({'counter_name': 'cpu_util', 'resource_id' : "$INSTANCE_ID"}).sort({'timestamp': 3})
Example)
> db.meter.find({'counter_name': 'cpu_util', 'resource_id' : "5be2531a-18b0-410a-abb9-090800656d58"}).sort({'timestamp': 3})
> var mapVolumes = function() {
... emit(this.resource_id, this.counter_volume);
... }
> var reduceAverage = function (key, values) {
... var total = 0;
... for (var i = 0; i < values.length; i++) {
... total += values[i];
... }
... return total / values.length;
... }
> db.meter.mapReduce(mapVolumes, reduceAverage, { out: { merge: 'average_util' }, query: {'counter_name': 'cpu_util'}});
{
"result" : "average_util",
"timeMillis" : 273,
"counts" : {
"input" : 2663,
"emit" : 2663,
"reduce" : 105,
"output" : 6
},
"ok" : 1,
}
> db.average_util.find()
{ "_id" : "0dc31dbb-47ea-4c50-a50f-16a0da6ad970", "value" : 4.736913871246464 }
{ "_id" : "2e7e2bbd-6661-4368-9f1a-ff3d272b5b81", "value" : 4.642959104484682 }
{ "_id" : "51ddc950-05ff-4101-bc58-dfc938cf6253", "value" : 4.76973059645138 }
{ "_id" : "58e32619-1b76-4e6d-9a12-9acb545c407c", "value" : 4.59 }
{ "_id" : "5be2531a-18b0-410a-abb9-090800656d58", "value" : 4.668502698020272 }
{ "_id" : "e1604924-d5eb-42ea-aac8-e98824d6c8aa", "value" : 4.58 }
