Nithin Bekal

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Postgresql

brew install postgresql
brew services start postgresql
initdb /usr/local/var/postgres

Manual steps (handled by brew services start):

# Tell launchd start postgresql at login
ln -sfv /usr/local/opt/postgresql/*.plist ~/Library/LaunchAgents

# To load pg now:
launchctl load ~/Library/LaunchAgents/homebrew.mxcl.postgresql.plist

# If you don't want launchctl:
postgres -D /usr/local/var/postgres

# Finally
createdb

If you run into the error:

PGError: ERROR:  new encoding (UTF8) is incompatible with the encoding of the template database (SQL_ASCII)
HINT:  Use the same encoding as in the template database, or use template0 as template.

To fix this, do the following from psql prompt:

UPDATE pg_database SET datistemplate = FALSE WHERE datname = 'template1';
DROP DATABASE template1;
CREATE DATABASE template1 WITH TEMPLATE = template0 ENCODING = 'UNICODE';
UPDATE pg_database SET datistemplate = TRUE WHERE datname = 'template1';
\c template1
VACUUM FREEZE;

If you see this error: FATAL: role "postgres" does not exist

CREATE USER postgres SUPERUSER;

Upgrading to 9.6

I was using 9.5.3 and upgrading to 9.6.1.

initdb /usr/local/var/postgres9.6 -E utf8

pg_upgrade \
  -d /usr/local/var/postgres \
  -D /usr/local/var/postgres9.6 \
  -b /usr/local/Cellar/postgresql/9.5.3/bin/ \
  -B /usr/local/Cellar/postgresql/9.6.1/bin/ \
  -v

mv /usr/local/var/postgres /usr/local/var/postgres9.5

mv /usr/local/var/postgres9.6 /usr/local/var/postgres

launchctl load ~/Library/LaunchAgents/homebrew.mxcl.postgresql.plist

gem uninstall pg
bundle install