Database / Supabase Intermediate to Advanced Interview Questions

What is the difference between daily backups and Point-in-Time Recovery in Supabase?

Daily backups are full snapshots of the database taken once a day and retained for a set window depending on plan tier; restoring from one returns the database to exactly the state it was in at that snapshot's timestamp, so anything written after it is lost.

Daily Backups	Point-in-Time Recovery (PITR)
Restores to a fixed daily snapshot	Restores to any second within the retention window
Simpler, included on most tiers	Uses continuous WAL archiving, needs a higher tier

PITR instead continuously archives the database's write-ahead log (WAL), so a restore can target any specific second within the retention window — useful when an incident (like a bad migration or an accidental mass-delete) happened at a known time and you want to recover to just before it, rather than losing an entire day's writes.

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What granularity of restore does PITR offer compared to daily backups? Only the most recent hour

✗ Try again, that's not it.

PITR cannot restore data at all

✗ Try again, that's not it.

Only the exact same daily snapshot

✗ Try again, that's not it.

Any specific second within the retention window

✓ Correct! Well done.

What underlying mechanism does PITR rely on? Client-side local storage

✗ Try again, that's not it.

A single nightly file copy

✗ Try again, that's not it.

Continuous write-ahead log (WAL) archiving

✓ Correct! Well done.

Manual CSV exports

✗ Try again, that's not it.

More Related questions...

How does Supabase expose custom Postgres functions as callable RPC endpoints? What is the difference between a SECURITY DEFINER and a SECURITY INVOKER Postgres function? How does pg_cron enable scheduled jobs directly inside a Supabase Postgres database? What is the difference between a read replica and the primary database in a Supabase project? When should you use a read replica versus scaling the primary database's resources? What is the difference between daily backups and Point-in-Time Recovery in Supabase? How does Supabase's database branching feature isolate schema changes per git branch? When would you choose a preview branch over testing migrations directly in staging? What is the difference between a custom access token hook and a raw JWT claim? Why should you avoid embedding sensitive business data directly inside JWT claims? How does Supabase support anonymous sign-ins, and how do you convert one to a permanent account? What is the difference between linking an OAuth identity and creating a brand-new user account? How is Storage object access controlled compared to table-level Row Level Security? What is the difference between resumable (TUS) uploads and standard uploads in Supabase Storage? How does Supabase's image transformation feature resize images without a separate CDN service? What is the difference between LISTEN/NOTIFY and Supabase Realtime's Postgres Changes channel? What is the difference between schema-per-tenant and RLS-based multi-tenancy? Why is EXPLAIN ANALYZE useful before optimizing a slow Supabase query? What is the difference between JSONB and a fully normalized relational schema in Postgres? When should you use a JSONB column instead of creating additional relational tables? How does wrapping auth.uid() in a subquery improve Row Level Security performance? Why do we use SECURITY DEFINER functions when RLS would otherwise block a needed operation? How does pg_net let Postgres make asynchronous HTTP calls without blocking a transaction? Explain the lifecycle of a Point-in-Time Recovery (PITR) backup in Supabase? How does a custom access token Auth Hook let you enrich a user's JWT with custom claims? How does Supabase enforce multi-factor authentication (MFA) at the session level? Why doesn't disabling RLS on a table make it invisible in the auto-generated API docs? Explain the internal working of Supabase Vault for storing encrypted secrets in Postgres? Why should you store third-party API keys in Vault instead of a plain table column? When should you choose LISTEN/NOTIFY over Supabase Realtime for internal service communication? How can you optimize a multi-tenant schema design using Row Level Security instead of schema-per-tenant? How do you troubleshoot a Postgres query that performs well in the SQL editor but slowly through the REST API? Explain the execution flow of a private Realtime broadcast channel authorized by Row Level Security? Why do private Realtime channels need their own RLS-style authorization check? How does Supabase's connection string differ between the direct connection, session pooler, and transaction pooler? Why doesn't the transaction pooler support prepared statements the way a direct connection does? How can you optimize zero-downtime schema migrations for a table already receiving production traffic? What happens when a long-running migration locks a table that's still receiving live writes? How does Supabase Studio's SQL editor differ from running migrations through the CLI in a CI pipeline? Which is better for production schema changes, editing directly in Studio or CLI-managed migrations, and why?

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