postgres=# select * from pg_settings where name='max_connections';
-[ RECORD 1 ]---+-----------------------------------------------------
name            | max_connections
setting         | 10000
unit            | 
category        | Connections and Authentication / Connection Settings
short_desc      | Sets the maximum number of concurrent connections.
extra_desc      | 
context         | postmaster
vartype         | integer
source          | configuration file
min_val         | 1
max_val         | 262143
enumvals        | 
boot_val        | 100
reset_val       | 10000
sourcefile      | /etc/postgresql/11/main/postgresql.conf
sourceline      | 64
pending_restart | f