On 11/25/2016 04:40 PM, Fabien COELHO wrote:
While the 9.6 cat is out of the bag, I think we can fix this quite
easily - use "-1" to specify the default value should be used, and use
that in the sample file. This won't break any user configuration.
Although I understand the issue, I'm not sure about -1 as a special
value to mean the default.
Why? We use wal_buffers=-1 to use the default (depending on the size
of shared_buffers), for example.
Indeed. Just my 0.02€:
ISTM that the use of -1 is not very consistent, as it may mean:
- default: autovacuum_work_mem, wal_buffers
- disable: temp_file_limit, old_snapshot_limit,
And sometimes disable is the default, but not always:-) Basically I'm
not sure that adding some more confusion around that helps much...
Well, the inconsistency is already there. Some GUCs use -1 as "use
default value" and others using it as "disable". Picking one of those
does not really increase the confusion, and it fixes the issue of having
a default mismatching the commented-out example.
Tomas Vondra http://www.2ndQuadrant.com
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
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