While my previous attempt seems to always produce valid YAML, it
doesn't always produce YAML that means what it appears to mean,
because of tokens like "0xa" and "true", which without quotes will
be interpreted as integer or Boolean literals.  So, instead, just
quote everything that's not known to be a number, as we do for
JSON.

Dean Rasheed, with some changes to the comments by me.

constraints

Dean Rasheed

checkpoint_timeout to trigger restartpoints. We used to deliberately only
do time-based restartpoints, because if checkpoint_segments is small we
would spend time doing restartpoints more often than really necessary.
But now that restartpoints are done in bgwriter, they're not as
disruptive as they used to be. Secondly, because streaming replication
stores the streamed WAL files in pg_xlog, we want to clean it up more
often to avoid running out of disk space when checkpoint_timeout is large
and checkpoint_segments small.

Patch by Fujii Masao, with some minor changes by me.

the current one. Not doing this would leave the walwriter with a handle to a
deleted file if there was nothing for it to do for a long period of time,
preventing the file from  being completely removed.

Reported by Tollef Fog Heen, and thanks to Heikki for some hand-holding with
the patch.

when connection string is longer than NAMEDATALEN.
The previous fix for long connection name broke the behavior.

The previous code failed to quote in many cases where quoting was necessary -
YAML has loads of special characters, including -:[]{},"'|*& - so quote much
more aggressively, and only refrain from quoting things where it seems fairly
clear that it isn't necessary.

Per report from Dean Rasheed.

end with "duplicate connection name" errors.

Backported to release 7.4.

Based on suggestions from Jonathan Leto and Joshua Tolley.

Fujii Masao

to be initialized with proper values. Affected parameters are
fillfactor, analyze_threshold, and analyze_scale_factor.

Especially uninitialized fillfactor caused inefficient page usage
because we built a StdRdOptions struct in which fillfactor is zero
if any reloption is set for the toast table.

In addition, we disallow toast.autovacuum_analyze_threshold and
toast.autovacuum_analyze_scale_factor because we didn't actually
support them; they are always ignored.

Report by Rumko on pgsql-bugs on 12 May 2010.
Analysis by Tom Lane and Alvaro Herrera. Patch by me.

Backpatch to 8.4.

Almost all of the terms in docs and messages were replaced, but still
remains in a few comments and README files in codes.

Per gripe from Frank van Vugt.

While the values were correctly returned they were not moved into C variables
as they should be.

Closes: #5489

tag 9.0beta2

been written out from shared memory, but the previous phrasing might be read
to say that we send only what's been fsync'd.

and current server clock time to SR data messages.  These are not currently
used on the slave side but seem likely to be useful in future, and it'd be
better not to change the SR protocol after release.  Per discussion.
Also do some minor code review and cleanup on walsender.c, and improve the
protocol documentation.

When referring to postgresql.conf syntax, then it's without quotes
(wal_level=archive); in narrative it's with double quotes.  But never
single quotes.

per recent unintended-initdb-forcing fiasco

--enable-ssl -> --with-openssl

Now long names are adjusted with truncate_identifier() and NOTICE messages
are raised if names are actually truncated.

Backported to release 8.0.

Fujii Masao.  Review by Heikki Linnakangas and myself.

Tim Landscheidt

overlaps.

David Fetter

Fujii Masao

release notes.