안녕하세요. 주디아줌마입니다. 
인덱스 튜닝을 위해서는 인덱스별 인덱스 사이즈 확인하고 싶을 때 사용할 수 있는 툴~~

툴 소개 : https://github.com/jwilder/mongodb-tools

참고링크

CentOS 5.3 + Python 2.6 + modwsgi + django 1.1 설치
http://blog.naver.com/PostView.nhn?blogId=aries84&logNo=100157702157

인덱스 참고 자료
https://openshift.redhat.com/community/blogs/design-and-performance-tips-for-mongodb-indexes http://support.serverdensity.com/knowledgebase/articles/76002-mongodb-ram-headroomhttp://support.serverdensity.com/knowledgebase/articles/93364-mongodb-index-stats

collection_stats.py
index_stats.py
redundant_indexes.py

collection-stats.py (Collection 통계 )

 $ ./collection-stats.py

 Checking DB: examples2.system.indexes
 Checking DB: examples2.things
 Checking DB: examples1.system.indexes
 Checking DB: examples1.address
 Checking DB: examples1.typeless_address
 Checking DB: examples1.user
 Checking DB: examples1.typeless_user


 +----------------------------+--------+--------+---------+--------------+---------+------------+
 |         Collection         | Count  | % Size | DB Size | Avg Obj Size | Indexes | Index Size |
 +----------------------------+--------+--------+---------+--------------+---------+------------+
 | examples1.address          |      2 |   0.0% | 184.00b |       92.00b |    2    |     15.97K |
 | examples1.system.indexes   |      9 |   0.0% | 912.00b |      101.33b |    0    |      0.00b |
 | examples1.typeless_address |      2 |   0.0% | 216.00b |      108.00b |    1    |      7.98K |
 | examples2.system.indexes   |      2 |   0.0% | 164.00b |       82.00b |    0    |      0.00b |
 | examples1.typeless_user    | 101879 |  26.7% |  10.10M |      104.00b |    3    |      8.18M |
 | examples1.user             | 101879 |  36.0% |  13.60M |      140.00b |    3    |     15.20M |
 | examples2.things           | 100000 |  37.3% |  14.11M |      148.00b |    2    |      5.67M |
 +----------------------------+--------+--------+---------+--------------+---------+------------+
 Total Documents: 303773
 Total Data Size: 37.82M
 Total Index Size: 29.08M
 RAM Headroom: 2.87G
 RAM Used: 2.74G (61.6%)
 Available RAM Headroom: 1.10G

index-stats.py(인덱스 통계)

$ ./index-stats.py


Checking DB: examples2.system.indexes
Checking DB: examples2.things
Checking DB: examples1.system.indexes
Checking DB: examples1.address
Checking DB: examples1.typeless_address
Checking DB: examples1.user
Checking DB: examples1.typeless_user

Index Overview
+----------------------------+------------------------+--------+------------+
|         Collection         |         Index          | % Size | Index Size |
+----------------------------+------------------------+--------+------------+
| examples1.address          | _id_                   |   0.0% |      7.98K |
| examples1.address          | _types_1               |   0.0% |      7.98K |
| examples1.typeless_address | _id_                   |   0.0% |      7.98K |
| examples1.typeless_user    | _id_                   |  10.9% |      3.17M |
| examples1.typeless_user    | address_id_1           |  10.9% |      3.17M |
| examples1.typeless_user    | typeless_address_ref_1 |   6.4% |      1.85M |
| examples1.user             | _id_                   |  10.9% |      3.17M |
| examples1.user             | _types_1_address_id_1  |  13.2% |      3.84M |
| examples1.user             | _types_1_address_ref_1 |  28.2% |      8.20M |
| examples2.things           | _id_                   |  10.7% |      3.11M |
| examples2.things           | _types_1               |   8.8% |      2.56M |
+----------------------------+------------------------+--------+------------+

Top 5 Largest Indexes
+-------------------------+------------------------+--------+------------+
|        Collection       |         Index          | % Size | Index Size |
+-------------------------+------------------------+--------+------------+
| examples1.user          | _types_1_address_ref_1 |  28.2% |      8.20M |
| examples1.user          | _types_1_address_id_1  |  13.2% |      3.84M |
| examples1.typeless_user | _id_                   |  10.9% |      3.17M |
| examples2.things        | _id_                   |  10.7% |      3.11M |
| examples2.things        | _types_1               |   8.8% |      2.56M |
+-------------------------+------------------------+--------+------------+

Total Documents: 303773
Total Data Size: 37.82M
Total Index Size: 29.08M
RAM Headroom: 2.87G
RAM Used: 2.73G (61.4%)  -- 메모리 사용 비율까지.ㅋㅋ
Available RAM Headroom: 1.11G