.. _glossary:

Glossary
========

.. glossary::

   Athena
      Amazon's serverless SQL query engine. Panorama uses it to create the data lake raw
      tables and views and to serve the BI tool.

   base partition
      A partition common to a whole installation, not derived from a source field (for example
      ``lms=<host>``). It separates data from different installations inside a shared data
      lake. See :ref:`elt_pipeline`.

   base prefix
      An optional name/subdirectory that groups tables of the same kind of system (for example
      ``openedx`` or ``moodle``), used in the S3 path and in default Athena table names.

   curated view
      An Athena view in the upper pipeline layer that joins, filters, and adds calculated
      fields on top of the typed table views. Dashboards read curated views.

   data lake
      The S3-based store of raw CSV files plus the Glue/Athena catalog that describes them.

   DashboardType
      A backend admin model that groups QuickSight dashboards by function or audience and can
      be marked available to students. See :ref:`backend_administration`.

   ELT
      Extract, Load, Transform. Panorama extracts and loads raw data first, then transforms it
      with SQL in the data lake. The extraction agent is ``panorama-elt``.

   embed URL
      A short-lived Amazon QuickSight URL that renders a dashboard for a specific user. The
      backend generates it; the MFE embeds it.

   field partition
      An optional split of a large table into multiple CSV files by the value of one or more
      fields. Enables incremental updates. See :ref:`elt_pipeline`.

   incremental update
      Uploading only the field partitions that changed within a configured interval, instead
      of the whole table. Requires field partitioning. See :ref:`elt_pipeline`.

   MFE
      Micro-frontend. The Open edX pattern of independent React front-end applications.
      ``frontend-app-panorama`` is Panorama's MFE.

   mode
      The backend's running mode: ``DEMO``, ``FREE``, ``SAAS``, or ``CUSTOM``. It decides where
      dashboards come from and who can see them. See :ref:`backend_modes`.

   QuickSight
      Amazon QuickSight, the BI and dashboard-embedding service used in the standard Panorama
      setup.

   raw table
      An external Athena table over the uploaded CSV files where every column is a string.
      Named ``<base_prefix>_raw_<table>`` by default.

   table view
      The first transformation layer: a view over a raw table that casts numeric and date
      fields and converts the literal ``'NULL'`` to real ``NULL``. Named
      ``<base_prefix>_table_<table>`` by default.

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