.. highlight:: rst

.. _scqueryqc:

#########
scqueryqc
#########

**Query waveform quality control (QC) parameters from database.**


Description
===========

scqueryqc queries a database for waveform quality control (QC) parameters. The
QC parameters can be provided and written to the database, e.g., by :ref:`scqc`.

.. warning ::

   Writing QC parameters to the database by :ref:`scqc` will result in a rapidly
   growing database and is therefore not recommended in permanent application without
   regularly stripping these parameters from the  database!

The database query is done for

* One or multiple streams,
* One or multiple QC parameters. All QC parameters can be requested. Defaults
  apply. For reading the defaults use

  .. code-block:: sh

     scqueryqc -h

* A single time window where the begin time must be provided. Current time is
  considered if the end is not give.


Workflow
--------

You should minimize the impact of stored waveform QC parameters on the size of the
database.

#. Compute the QC parameters in real time using :ref:`scqc` and save them in the
   |scname| database. Saving the QC parameters in the database requires to
   adjust the scqc module configuration parameters
   :confval:`plugins.$name.archive.interval` for each plugin.
#. Regularly use scqueryqc for some time span to read the QC parameters from the
   database. Save them in a XML files.

   Example for all QC parameters found for all streams in the inventory before
   end time:

   .. code-block:: sh

      scqueryqc -d [host] -e '[end time]' --streams-from-inventory -o [XML file]


#. Clean the database from QC parameters.

   * Either use :ref:`scdispatch` with the parameters saved in XML. You may need
     to set the routing table for sending the QualityControl parameters to the
     right message group, e.g., QC:

     .. code-block:: sh

        scdispatch -H [host] -O remove --routingtable QualityControl:QC -i [XML file]

   * Alternatively, use :ref:`scdbstrip` with the command-line option
     :option:`--qc-only` and remove **all** QC parameters in the time span. Use the same
     period for which the QC parameters were retrieved:

     .. code-block:: sh

        scdbstrip -d [database] -Q --date-time '[end time]'

     .. note ::

        Considering an end time by :option:`--date-time` has the advantage that no QC
        parameters are removed which were measured after scqueryqc was applied with the
        same end time value.

Examples
--------

* Query rms and delay values for the stream AU.AS18..SHZ,AU.AS19..SHZ before
  '2021-11-20 00:00:00'. Write the XML to stdout

  .. code-block:: sh

     scqueryqc -d localhost -e '2021-11-20 00:00:00' -p rms,delay -i AU.AS18..SHZ,AU.AS19..SHZ

* Query all default QC parameter values for all streams found in the inventory
  from '2021-11-20 00:00:00' until current. Write the formatted XML output to
  :file:`/tmp/query.xml`

  .. code-block:: sh

     scqueryqc -d localhost -b '2021-11-20 00:00:00' --streams-from-inventory -f -o /tmp/query.xml


.. _scqueryqc_configuration:

Module Configuration
====================

| :file:`etc/defaults/global.cfg`
| :file:`etc/defaults/scqueryqc.cfg`
| :file:`etc/global.cfg`
| :file:`etc/scqueryqc.cfg`
| :file:`~/.seiscomp/global.cfg`
| :file:`~/.seiscomp/scqueryqc.cfg`

scqueryqc inherits :ref:`global options<global-configuration>`.




Command-Line Options
====================

.. program:: scqueryqc

:program:`scqueryqc [options]`


Generic
-------

.. option:: -h, --help

   Show help message.

.. option:: -V, --version

   Show version information.


Verbosity
---------

.. option:: --verbosity arg

   Verbosity level [0..4]. 0:quiet, 1:error, 2:warning, 3:info,
   4:debug.

.. option:: -v, --v

   Increase verbosity level \(may be repeated, eg. \-vv\).

.. option:: -q, --quiet

   Quiet mode: no logging output.

.. option:: --component arg

   Limit the logging to a certain component. This option can
   be given more than once.

.. option:: -s, --syslog

   Use syslog logging backend. The output usually goes to
   \/var\/lib\/messages.

.. option:: -l, --lockfile arg

   Path to lock file.

.. option:: --console arg

   Send log output to stdout.

.. option:: --debug

   Execute in debug mode.
   Equivalent to \-\-verbosity\=4 \-\-console\=1 .

.. option:: --log-file arg

   Use alternative log file.


Database
--------

.. option:: --db-driver-list

   List all supported database drivers.

.. option:: -d, --database arg

   The database connection string, format:
   service:\/\/user:pwd\@host\/database.
   \"service\" is the name of the database driver which
   can be queried with \"\-\-db\-driver\-list\".

.. option:: --inventory-db arg

   Load the inventory from the given database or file, format:
   [service:\/\/]location .


Output
------

.. option:: -o, --output filename

   Name of output XML file. Objects are sent to stderr if none
   is given.

.. option:: -f, --formatted

   Write formatted XML.


Query
-----

.. option:: -b, --begin time

   Begin time of query. Format: 'YYYY\-MM\-DD hh:mm:ss'.
   '1900\-01\-01T00:00:00Z' is considered if undefined.

.. option:: -e, --end time

   End time of query. Format: 'YYYY\-MM\-DD hh:mm:ss'.
   Current time is considered if undefined.

.. option:: -i, --stream-id string

   Waveform stream ID to search for QC parameters: net.sta.loc.cha \-
   [networkCode].[stationCode].[sensorLocationCode].[channelCode].
   Provide a single ID or a comma\-separated list. Overrides
   '\-\-streams\-from\-inventory'.

.. option:: -p, --parameter string

   QC parameter to output: \(e.g. delay,rms,'gaps count' ...\).
   Use quotes if QC parameter has more than 1 word.
   Provide a single parameter or a comma\-separated list.
   Defaults are used if parameter is undefined.

.. option:: --streams-from-inventory

   Read streams from inventory. Superseded by '\-\-stream\-id'.

