What Heroku's upgrade procedure essentially does it the following: create a follower, upgrade, switch over the follower as main DB
The downtime is required to disable processes that write to the main DB while the follower finalizes the sync and upgrades
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What Heroku's upgrade procedure essentially does it the following: create a follower, upgrade, switch over the follower as main DB
The downtime is required to disable processes that write to the main DB while the follower finalizes the sync and upgrades