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.. _pt-mongodb-query-digest:
==================================
:program:`pt-mongodb-query-digest`
==================================
``pt-mongodb-query-digest`` reports query usage statistics
by aggregating queries from MongoDB query profiler.
Usage
=====
.. code-block:: bash
pt-mongodb-query-digest [OPTIONS]
It runs the following command::
db.getSiblingDB("samples").system.profile.find({"op":{"$nin":["getmore", "delete"]}});
Then the results are grouped by fingerprint and namespace
(database.collection).
The fingerprint is calculated as a sorted list of keys in the document
with a maximum depth level of 10.
By default, the results are sorted by ascending query count.
.. note:: ``pt-mongodb-query-digest`` cannot collect statistics
from MongoDB instances that require connection via SSL.
Support for SSL will be added in the future.
Options
-------
``-?``, ``--help``
Show help and exit
``-a``, ``--authenticationDatabase``
Specifies the database used to establish credentials and privileges
with a MongoDB server.
By default, the ``admin`` database is used.
``-c``, ``--no-version-check``
Don't check for updates
``-d``, ``--database``
Specifies which database to profile
``-f``, ``--output-format``
Specifies the report output format. Valid options are: ``text``, ``json``.
The default value is ``text``.
``-l``, ``--log-level``
Specifies the log level:
``panic``, ``fatal``, ``error``, ``warn``, ``info``, ``debug error``
``-n``, ``--limit``
Limits the number of queries to show
``-o``, ``--order-by``
Specifies the sorting order using fields:
``count``, ``ratio``, ``query-time``, ``docs-scanned``, ``docs-returned``.
Adding a hypen (``-``) in front of a field denotes reverse order.
For example: ``--order-by="count,-ratio"``.
``-p``, ``--password``
Specifies the password to use when connecting to a server
with authentication enabled.
Do not add a space between the option and its value: ``-p<password>``.
If you specify the option without any value,
you will be prompted for the password.
``-u``, ``--user``
Specifies the user name for connecting to a server
with authentication enabled.
``-v``, ``--version``
Show version and exit
Output Example
==============
.. code-block:: none
# Query 2: 0.00 QPS, ID 1a6443c2db9661f3aad8edb6b877e45d
# Ratio 1.00 (docs scanned/returned)
# Time range: 2017-01-11 12:58:26.519 -0300 ART to 2017-01-11 12:58:26.686 -0300 ART
# Attribute pct total min max avg 95% stddev median
# ================== === ======== ======== ======== ======== ======== ======= ========
# Count (docs) 36
# Exec Time ms 0 0 0 0 0 0 0 0
# Docs Scanned 0 148.00 0.00 74.00 4.11 74.00 16.95 0.00
# Docs Returned 2 148.00 0.00 74.00 4.11 74.00 16.95 0.00
# Bytes recv 0 2.11M 215.00 1.05M 58.48K 1.05M 240.22K 215.00
# String:
# Namespaces samples.col1
# Fingerprint $gte,$lt,$meta,$sortKey,filter,find,projection,shardVersion,sort,user_id,user_id
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