Regular MongoDB CLI commands to get data on collections are dull:
rs0:PRIMARY> db
testX
rs0:PRIMARY> show collections
Xfoo
account
corn
foo
geo
myColl
qqq
test
ticks
rs0:PRIMARY> db.account.stats();
{
"ns" : "testX.account",
"size" : 72758890,
"count" : 1000000,
"avgObjSize" : 72,
"storageSize" : 22904832,
"capped" : false,
"wiredTiger" : {
"metadata" : {
"formatVersion" : 1
},
Even with some simple clever programming, it's still ... weak:
rs0:PRIMARY> db.getCollectionNames().forEach(function(name) { var q = db[name].stats(); print("name: " + name + "; " + "count: " + q["count"]); });
name: Xfoo; count: 0
name: account; count: 1000000
name: corn; count: 4
name: foo; count: 9
name: geo; count: 3
name: myColl; count: 1
name: qqq; count: 1
name: test; count: 4
name: ticks; count: 86400
But what you really want is something like this. Nicely formatted data with totals, averages, etc.:
rs0:PRIMARY> db.collsize();
Collection Count AvgSize Unz Xz +Idx TotIdx Idx/doc
-------------------- ------- -------- -G--M------ --- ---- ---M------ -------
Xfoo 0 -1 0 0.0 1 2236416 NaN
myColl 1 76 76 0.0 0 16384 0
qqq 1 33 33 0.0 0 16384 0
geo 3 484 1453 0.0 1 32768 0
corn 4 29 116 0.0 0 16384 0
test 4 19 76 0.0 0 16384 0
foo 9 27 246 0.0 0 16384 0
ticks 86400 61 5270400 3.2 3 2957312 33
account 1000000 72 72758890 3.2 1 20770816 20
----- ------- -------- -G--M------ --- ---- ---M------ -------
9 1086422 78031290 26079232
collsize extends the MongoDB CLI DB object prototype (db.proto)
with a new method
collsize and formats it nicely. Unz is the UNcompressed size of the data
i.e. as it would appear as a set of BSON objects in memory. Xz is the
compression factor, so for example an UNz of 60MB with an Xz of 3 would
(roughly) have an actual storage allocation of only 20MB. +Idx is the
number of additional indexes beyond the mandatory index on _id.
TotIdx is the on-disk size of all the indexes.
By default, it is sorted by count.
You can change sort by supplying the name of the column header in any
case combination:
rs0:PRIMARY> db.collsize("uNz"); // mixed case does not matter
Collection Count AvgSize Unz Xz +Idx TotIdx Idx/doc
-------------------- ------- -------- -G--M------ --- ---- ---M------ -------
Xfoo 0 -1 0 0.0 1 2236416 NaN
qqq 1 33 33 0.0 0 16384 0
myColl 1 76 76 0.0 0 16384 0
test 4 19 76 0.0 0 16384 0
corn 4 29 116 0.0 0 16384 0
(etc)
Placing a dash - in front of the sort column name inverts the sort:
rs0:PRIMARY> db.collsize("-count")
Collection Count AvgSize Unz Xz +Idx TotIdx Idx/doc
-------------------- ------- -------- -G--M------ --- ---- ---M------ -------
account 1000000 72 72758890 3.2 1 20770816 20
ticks 86400 61 5270400 3.2 3 2957312 33
foo 9 27 246 0.0 0 16384 0
corn 4 29 116 0.0 0 16384 0
test 4 19 76 0.0 0 16384 0
(etc)
Easy! Just load collsize.js from the prompt:
$ mongo
MongoDB shell version v4.0.0
connecting to: mongodb://127.0.0.1:37017/testX
MongoDB server version: 4.0.0
rs0:PRIMARY> load("collsize.js");
true
rs0:PRIMARY> db.collsize()
Collection Count AvgSize Unz Xz +Idx TotIdx Idx/doc
-------------------- ------- -------- -G--M------ --- ---- ---M------ -------
Xfoo 0 -1 0 0.0 1 2236416 NaN
myColl 1 76 76 0.0 0 16384 0
(etc)
Copyright (C) {2018} {Buzz Moschetti}
This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
This software is not supported by MongoDB, Inc. under any of their commercial support subscriptions or otherwise.