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|Reported by||gabrielle roth|
Body of first available message related to this bug follows.
The following bug has been logged on the website: Bug reference: 16248 Logged by: gabrielle roth Email address: (redacted) PostgreSQL version: 11.6 Operating system: Ubuntu Description: Hi all! I tried out `ALTER SYSTEM` for the first time last week, and ran into something that confused me: tl;dr: ALTER SYSTEM SET log_statement = 'all'; -- quotes required around the new value vs ALTER SYSTEM SET shared_preload_libraries = pg_stat_statements,plprofiler; -- requires the new value *not* be quoted, this is what's confusing me How I got there: Initially, I tried quotes around the value, as that's the way I'd write it in postgresql.conf: ALTER SYSTEM SET shared_preload_libraries = 'pg_stat_statements,plprofiler'; When I restarted my database to apply the change, it failed with this error (note the value now has double quotes) FATAL: could not access file "pg_stat_statements,plprofiler": No such file or directory And this is what ended up in postgresql.auto.conf: shared_preload_libraries = '"pg_stat_statements,plprofiler"' From the docs for ALTER SYSTEM (https://www.postgresql.org/docs/11/sql-altersystem.html): "Values can be specified as string constants, identifiers, numbers, or comma-separated lists of these, as appropriate for the particular parameter." From the docs for "Setting parameters" (https://www.postgresql.org/docs/11/config-setting.html): "String: In general, enclose the value in single quotes, doubling any single quotes within the value. Quotes can usually be omitted if the value is a simple number or identifier, however." I eventually got help from a friend, who tipped me off that the value for shared_preload_libraries should not be quoted. That seems weird to me because of the requirement for quoting on other settings, e.g. log_statement. Is this expected behavior? If so, can we get some examples in the docs to help folks figure out the correct quoting rules? Thank you! gabrielle
|2020-02-07 18:20:12+00||PG Bug reporting form||BUG #16248: ALTER SYSTEM quoting of values does not work as expected|
|2020-02-07 19:12:53+00||Tom Lane||Re: BUG #16248: ALTER SYSTEM quoting of values does not work as expected|