Upgrading a Heroku PostgreSQL database with pg:copy

Figured this out in https://github.com/simonw/simonwillisonblog/issues/132 - I was running PostgreSQL 9.x and I wanted 11.x in order to use the new search_type="websearch" option in Django 3.1.

I followed the steps in Upgrading with pg:copy (I don't have any database followers so the pg:upgrade route wasn't open to me).

Because I'm the only user who writes to my database I skipped the maintenance mode bit.

Step one: provision a new DB:

$ heroku addons:create heroku-postgresql:hobby-basic -a simonwillisonblog
Creating heroku-postgresql:hobby-basic on ⬢ simonwillisonblog... $9/month
▸    Release command executing: config vars set by this add-on will not be
▸    available until the command succeeds. Use `heroku releases:output` to view
▸    the log.
Database has been created and is available
! This database is empty. If upgrading, you can transfer
! data from another database with pg:copy
Created postgresql-animate-15868 as HEROKU_POSTGRESQL_JADE_URL
Use heroku addons:docs heroku-postgresql to view documentation

Step 2 skipped - I didn't bother with maintenance mode

Step 3: copy the data to the new database:

$ heroku pg:copy DATABASE_URL HEROKU_POSTGRESQL_JADE_URL --app simonwillisonblog
▸    WARNING: Destructive action
▸    This command will remove all data from JADE
▸    Data from DATABASE will then be transferred to JADE
▸    To proceed, type simonwillisonblog or re-run this command with --confirm simonwillisonblog

> simonwillisonblog
Starting copy of DATABASE to JADE... done
Copying... done

Step 4: promote the new database:

$ heroku pg:promote HEROKU_POSTGRESQL_JADE -a simonwillisonblog
Ensuring an alternate alias for existing DATABASE_URL... HEROKU_POSTGRESQL_OLIVE_URL
Promoting postgresql-animate-15868 to DATABASE_URL on ⬢ simonwillisonblog... done
Checking release phase... pg:promote succeeded. It is safe to ignore the failed Detach DATABASE (@ref:postgresql-contoured-66343) release.

Step 5: deprovision the old database

% heroku addons:destroy HEROKU_POSTGRESQL_OLIVE -a simonwillisonblog
 ▸    WARNING: Destructive Action
 ▸    This command will affect the app simonwillisonblog
 ▸    To proceed, type simonwillisonblog or re-run this command with --confirm simonwillisonblog

> simonwillisonblog
Destroying postgresql-contoured-66343 on ⬢ simonwillisonblog... done

Created 2020-07-20T11:58:27-07:00, updated 2020-07-20T15:31:56-07:00 · History · Edit