2014-10-28 22:44:28 +00:00
|
|
|
|
.. _limits:
|
|
|
|
|
|
|
|
|
|
|
|
Limits
|
|
|
|
|
|
------
|
|
|
|
|
|
|
|
|
|
|
|
Locmem
|
|
|
|
|
|
......
|
|
|
|
|
|
|
|
|
|
|
|
Locmem is a just a dict stored in a single Python process.
|
|
|
|
|
|
It’s not shared between processes, so don’t use locmem with django-cachalot
|
|
|
|
|
|
in a multi-processes project, if you use RQ or Celery for instance.
|
|
|
|
|
|
|
2014-12-13 19:05:39 +00:00
|
|
|
|
|
|
|
|
|
|
MySQL
|
|
|
|
|
|
.....
|
|
|
|
|
|
|
|
|
|
|
|
This database software already provides by default something like
|
|
|
|
|
|
django-cachalot:
|
|
|
|
|
|
`MySQL query cache <http://dev.mysql.com/doc/refman/5.7/en/query-cache.html>`_.
|
|
|
|
|
|
Django-cachalot will slow down your queries if that query cache is enabled.
|
|
|
|
|
|
If it’s not enabled, django-cachalot will make queries much faster.
|
|
|
|
|
|
But you should probably better enable the query cache instead.
|
|
|
|
|
|
|
2014-11-04 00:17:35 +00:00
|
|
|
|
.. _Raw queries limits:
|
2014-10-28 22:44:28 +00:00
|
|
|
|
|
2014-11-04 00:17:35 +00:00
|
|
|
|
Raw SQL queries
|
|
|
|
|
|
...............
|
2014-10-28 22:44:28 +00:00
|
|
|
|
|
2014-11-04 00:17:35 +00:00
|
|
|
|
.. note::
|
|
|
|
|
|
Don’t worry if you don’t understand what follow. That probably means you
|
|
|
|
|
|
don’t use raw queries, and therefore are not directly concerned by
|
|
|
|
|
|
those potential issues.
|
|
|
|
|
|
|
|
|
|
|
|
By default, django-cachalot tries to invalidate its cache after a raw query.
|
|
|
|
|
|
It detects if the raw query contains ``UPDATE``, ``INSERT`` or ``DELETE``,
|
|
|
|
|
|
and then invalidates the tables contained in that query by comparing
|
|
|
|
|
|
with models registered by Django.
|
|
|
|
|
|
|
|
|
|
|
|
This is quite robust, so if a query is not invalidated automatically
|
2014-11-04 00:19:20 +00:00
|
|
|
|
by this system, please :ref:`send a bug report <reporting>`.
|
2014-11-04 00:17:35 +00:00
|
|
|
|
In the meantime, you can use :ref:`the API <API>` to manually invalidate
|
|
|
|
|
|
the tables where data has changed.
|
|
|
|
|
|
|
|
|
|
|
|
However, this simple system can be too efficient in some cases and lead to
|
|
|
|
|
|
unwanted extra invalidations.
|
|
|
|
|
|
In such cases, you may want to partially disable this behaviour by
|
|
|
|
|
|
:ref:`dynamically overriding settings <Dynamic overriding>` to set
|
|
|
|
|
|
:ref:`CACHALOT_INVALIDATE_RAW` to ``False``.
|
|
|
|
|
|
After that, use :ref:`the API <API>` to manually invalidate the tables
|
|
|
|
|
|
you modified.
|
