State information for MongoDB databases and collections

View database statistics: db.stats ()

> use test switched to DB Test > Db.stats () {         "DB" : "Test",         "collections": 6, ,         "Objects": 3149516,         "avgobjsize": 71.99159362898935, ,         "datasize": 226738676 ,         "storagesize": 377942016,         "numextents": +,         "Indexes": 5,         "indexsize": 102535216,         "FileSize": 2080374784,         "NSSIZEMB":         "Datafileversion" : {                 ' major ': 4,                 "Minor": 6        },         "OK": 1 }

Note: The return value is interpreted as follows:

"DB": Database name

"Collections": Number of collections
"Objects": Number of documents
"Avgobjsize": Average size of each document
"DataSize": Data footprint, excluding index, in bytes
"Storagesize": Allocated storage space, this value does not degrade when the collection or document is deleted

"Numextents": contiguous allocated blocks of data

"Indexes": Number of indexes
"Indexsize": Index occupy space size
"FileSize": the size of the physical storage file
"Nssizemb": namespace File Size
"Datafileversion": {
"Major": Data file Major version number
"Minor": Minor version number
},

Collection Statistics: db.collection.stats ()

> Db. User.stats () {         "ns": "Test. User,         "Count": 3149352,         "size": 226727736,   &NBS P     "Avgobjsize": 71.9918688034872,         "storagesize": 377905152,         "numextents": +,         "nindexes": 2,         "Lastexten Tsize ": 104161280,        " Paddingfactor ": 1.0000000000000004,        " s Ystemflags ": 0,        " UserFlags ": 0,        " totalindexsize ": 1817443         "indexsizes": {                 "_id_": 10 2502512,                 "age_1": 79241792        },        "OK": 1 }

Note: The return value is interpreted as follows:
"NS": namespace

"Count": Number of documents

' Size ': Data footprint in the collection, excluding indexes
"Avgobjsize": Average size of each document
"Storagesize": Allocated storage space, this value does not degrade when the document in the collection is deleted
"Numextents": contiguous allocated blocks of data
"Nindexes": Number of indexes

"Lastextentsize": the size of the most recently allocated block

"Paddingfactor": Fill factor

"Systemflags": Unknown

"UserFlags": Unknown

"Totalindexsize": Index occupies total space size

"Indexsizes": {
"_ID_": ID column index occupies space size
"Age_1": Age column occupies space size
},

from:http://blog.csdn.net/seteor/article/details/11601273

State information for MongoDB databases and collections