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Mark default_transaction_read_only as GUC_REPORT.

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This allows clients to find out the setting at connection time without
having to expend a query round trip to do so; which is helpful when
trying to identify read/write servers.  (One must also look at
in_hot_standby, but that's already GUC_REPORT, cf bf8a662c9.)
Modifying libpq to make use of this will come soon, but I felt it
cleaner to push the server change separately.

Haribabu Kommi, Greg Nancarrow, Vignesh C; reviewed at various times
by Laurenz Albe, Takayuki Tsunakawa, Peter Smith.

Discussion: https://postgr.es/m/CAF3+xM+8-ztOkaV9gHiJ3wfgENTq97QcjXQt+rbFQ6F7oNzt9A@mail.gmail.com
This commit is contained in:
Tom Lane
2021-03-02 13:53:46 -05:00
parent 75dbfe4ca7
commit d16f8c8e41
3 changed files with 8 additions and 3 deletions
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3
src/backend/utils/misc/guc.c
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@ -1619,7 +1619,8 @@ static struct config_bool ConfigureNamesBool[] =
{
{"default_transaction_read_only", PGC_USERSET, CLIENT_CONN_STATEMENT,
gettext_noop("Sets the default read-only status of new transactions."),
NULL
NULL,
GUC_REPORT
},
&DefaultXactReadOnly,
false,