Supabase database errorSupabase: “canceling statement due to statement timeout” (57014)

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Why the query runs too long, and the fix

1. 01

   The API roles have short limits

   “The default role timeouts are: anon: 3s authenticated: 8s” Supabase, Timeouts

   Postgres stops any statement that runs past statement_timeout, and supabase-js returns it as an error with code 57014. Calls from supabase-js run as anon or authenticated, with short limits so one slow query can’t hold the database. A report or export that is fine in the SQL editor can time out from the app.

2. 02

   A missing index

   A filter or sort on a column with no index reads the whole table. Check the plan and add the index the query needs. explain analyze really runs the query, and in the SQL editor it runs as postgres, so it shows the plan but not the timeout.

   explain analyze
   select * from public.orders where customer_id = 'abc' order by created_at desc limit 20;
   
   create index if not exists orders_customer_created_idx
     on public.orders (customer_id, created_at desc);

3. 03

   An RLS policy runs on every row

   A policy that calls auth.uid() or a function per row can make a simple select slow. Wrap the call as (select auth.uid()) so Postgres runs it once, and index the columns the policy filters on.

   create policy "own orders" on public.orders
     for select to authenticated
     using (customer_id = (select auth.uid()));

4. 04

   The work really is long

   “If you are changing the timeout for the Supabase Client API calls, you will need to reload PostgREST to reflect the timeout changes by running the following script:” Supabase, Timeouts

   Raise the limit for the role that runs it, then reload PostgREST so the API uses it. Keep the limit as low as the job allows. For one-off jobs, a direct connection with a session setting is safer.

   alter role authenticated set statement_timeout = '15s';
   notify pgrst, 'reload config';

5. 05

   Big updates and deletes in one statement

   Updating or deleting a large part of a table in one call can run past any limit. Split it into batches by id range, and page large reads with limit and range instead of fetching everything.

Checked against the vendor’s docs on November 9, 2026: Supabase docs: Timeouts; PostgreSQL docs: Client connection defaults.

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