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Documenting connection pool config settings (#1197)

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lmitul 2018-04-10 16:50:58 -07:00 committed by kevgliss
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docs/administration.rst
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@ -65,6 +65,36 @@ Basic Configuration
SQLALCHEMY_DATABASE_URI = 'postgresql://<user>:<password>@<hostname>:5432/lemur'
.. data:: SQLALCHEMY_POOL_SIZE
:noindex:
The default connection pool size is 5 for sqlalchemy managed connections. Depending on the number of Lemur instances,
please specify per instance connection pool size. Below is an example to set connection pool size to 10.
::
SQLALCHEMY_POOL_SIZE = 10
.. warning::
This is an optional setting but important to review and set for optimal database connection usage and for overall database performance.
.. data:: SQLALCHEMY_MAX_OVERFLOW
:noindex:
This setting allows to create connections in addition to specified number of connections in pool size. By default, sqlalchemy
allows 10 connections to create in addition to the pool size. This is also an optional setting. If `SQLALCHEMY_POOL_SIZE` and
`SQLALCHEMY_MAX_OVERFLOW` are not speficied then each Lemur instance may create maximum of 15 connections.
::
SQLALCHECK_MAX_OVERFLOW = 0
.. note::
Specifying the `SQLALCHEMY_MAX_OVERFLOW` to 0 will enforce limit to not create connections above specified pool size.
.. data:: LEMUR_ALLOW_WEEKEND_EXPIRATION
:noindex: