Which database does heroku use

All Heroku Postgres databases have a corresponding Heroku application. You can find the application name on the database page at data. Your database is attached to the Heroku app and is accessible via an app config var containing the database URL, even if you host no code in the application itself.

The database URL is managed by Heroku and will change under some circumstances such as:. Many applications access only a small, recently modified portion of their overall data. Postgres can always keep that portion in its cache as time goes on, and consequently these applications can perform well on smaller plans.

These apps can observe dramatic increases in performance by ensuring that their entire dataset fits in memory. To determine the total size of your dataset, use the heroku pg:info command and look for the Data Size row:. Although a crude measure, choosing a plan that has at least as much in-memory cache available as the size of your total dataset ensures high cache ratios.

However, you will eventually reach the point where you have more data than the largest plan, and you will have to shard. Plan ahead for sharding: it takes a long time to execute a sharding strategy. There is no substitute for observing the database demands of your application with live traffic to determine the appropriate cache size. Uncommon queries should require less than ms and common ones less than 10ms. This blog post includes a deeper discussion of Postgres performance concerns and techniques.

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