PostgresSQL capacity,

1. find the PostgresSQL config file
2. edit the line max_connections from 100 to 10000, then restart your post.

for the sewing up for server its even better to consider more max_connections.

to find the address on the Mac run the command on terminal: "ps aux | grep postgres"

then you can see the users and the pipelines, on -D (the -D means directory)you can find the address that by default is -D > /usr/local/var/postgres