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[2.1.x] Updated docs for fast column creation with defaults in PostgreSQL 11. 

Backport of 133e79399a from master.
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Damian Dimmich 2018-11-26 10:47:37 +04:00 committed by Tim Graham
parent 4e6285c490
commit 0d4bbd3f33
1 changed files with 3 additions and 2 deletions
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docs/topics/migrations.txt
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@ -67,9 +67,10 @@ PostgreSQL
----------
PostgreSQL is the most capable of all the databases here in terms of schema
support; the only caveat is that adding columns with default values will
cause a full rewrite of the table, for a time proportional to its size.
support.
The only caveat is that prior to PostgreSQL 11, adding columns with default
values causes a full rewrite of the table, for a time proportional to its size.
For this reason, it's recommended you always create new columns with
``null=True``, as this way they will be added immediately.