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:banner: banners/odoo-sh.jpg
.. _odoosh-advanced-frequent_technical_questions:
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Frequent Technical Questions
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"Scheduled actions do not run at the exact time they were expected"
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On the Odoo.sh platform, we cannot guarantee an exact running time for scheduled actions.
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This is due to the fact that there might be multiple customers on the same server, and we must guarantee a fair share of the server for every customer. Scheduled actions are therefore implemented slightly differently than on a regular Odoo server, and are run on a *best effort* policy.
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.. warning ::
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Do not expect any scheduled action to be run more often than every 5 min.
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Are there "best practices" regarding scheduled actions?
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-------------------------------------------------------
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**Odoo.sh always limits the execution time of scheduled actions (*aka* crons).**
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Therefore, you must keep this fact in mind when developing your own crons.
We advise that:
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- Your scheduled actions should work on small batches of records.
- Your scheduled actions should commit their work after processing each batch;
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this way, if they get interrupted by the time-limit, there is no need to start over.
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- Your scheduled actions should be
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`idempotent <https://stackoverflow.com/a/1077421/3332416> `_ : they must not
cause side-effects if they are started more often than expected.
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Can you install `pycups <https://pypi.org/project/pycups/>`_ or some similar library linked to `CUPS <https://www.cups.org/>`_ ?
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Several community apps for Odoo list `` pycups `` as required dependency.
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- `` pycups `` is a set of Python bindings for the libcups library. They are meant to integrate your computer with a local printing server.
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- CUPS is a printing server meant to be used for printers on the same local network as the Odoo server.
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We consider adding new system packages as long as they are indeed used.
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Regarding `` pycups `` , you won't be able to configure a printer in the local network of your Odoo.sh server.
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