view TODO @ 501:594859656a06 large-queries

Added support for ExtendedApiV1: /changes
author Alain Mazy <am@orthanc.team>
date Thu, 11 Apr 2024 18:52:42 +0200
parents 827e438439c4
children bf4b9c7cf338
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== Orthanc database plugins ==
==============================

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Common - Database index
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* Performance of joins in LookupResources: Create cached statement for
  LookupResources, that are grouped to search up to, say, 10 tags,
  instead of recompiling for each request

---------------------
Common - Storage area
---------------------

* Implement the "StoreDicom" option from the default filesystem
  storage area to run MySQL/PostgreSQL storage in index-only mode:
  https://orthanc.uclouvain.be/book/contributing.html

* Performance: Add a pool of connections to PostgreSQL/MySQL, as
  already done in the database index plugins

----------
PostgreSQL
----------

* Check if we can force the schema that is used.  By default, Orthanc
  is using the 'public' schema but, after a wrong command, we have seen
  a DB where there was a 'AttachedFiles' table in the public schema and another one in a
  'MyPacs' schema and Orthanc was actually using the 'MyPacs.AttachedFiles' table !!!
  Orthanc was then seeing only the most recent attached files !!!

* Have a separate "thread" to UpdateStatistics to avoid large computations ?


* Seems Orthanc might deadlock when there are plenty of conflicting transactions:
  https://groups.google.com/g/orthanc-users/c/xQelEcKqL9U/m/HsvxwlkvAQAJ
  https://groups.google.com/g/orthanc-users/c/1bkClfZ0KBA/m/s4AlwVh3CQAJ 

-----
MySQL
-----

* Store revisions for metadata and attachments in MySQL (this is
  already implemented in PostgreSQL)

* MySQL performance => implement GlobalProperty_GetTotalSizeIsFast:
  https://groups.google.com/d/msg/orthanc-users/kSR4a110zDo/D7e4ITR8BwAJ

* Add index to speed up wildcard search, as already done in PostgreSQL:

  - https://dev.mysql.com/doc/refman/5.5/en/fulltext-search.html +
    ALTER TABLE table ADD FULLTEXT index_name(column1);

  - https://dev.mysql.com/doc/refman/8.0/en/index-btree-hash.html


----
ODBC
----

* https://orthanc.uclouvain.be/bugs/show_bug.cgi?id=224