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That is, a local file on the client machine with default "host", "port", "user" values, etc., so that I don't have to enter them on the command line each time?
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PostgreSQL configuration files are stored in the /etc/postgresql/<version>/main directory. For example, if you install PostgreSQL 12, the configuration files are stored in the /etc/postgresql/12/main directory.
No, there is no technical problem. Both default to different ports they listen on. The only problem that could arise is that each individual DB might be slower compared to an installation on separate phyiscal machines because they are both share (and fight for) for the same resources (I/O, memory, CPU, network, ...)
cnf is located in /etc/mysql/my. cnf .
conf is PostgreSQL's main configuration file and the primary source of configuration parameter settings. postgresql. conf is a plain text file generated by initdb and is normally stored in the data directory. However some distributions' packages may place postgresql.
Use the password file with lines like:
hostname:port:database:username:password
If you always log into the same host:db:port:user then this will make it:
*:*:*:*:mypassword
You can either define one (or several ) alias to psql with the proper arguments for user, database, host. Or set some environment values.
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