MEHUL.JAIN
I have a use case where I want to insert large number of rows in PG Table at once from Ecto. But ecto has a param limit of 65_535, so the max rows I can insert is 65_535 / tot_number_of_fields_in_schema.
To overcome this, I am trying to see if I can to
Repo.insert_all(Schema, query)
query = from(c in Ecto.Query.fragment("SELECT * FROM unnest(? as field1, ? as field2"), ^field1_array, ^field2_array)
The idea here is, the total params will be 2 in this case
-- before
INSERT INTO users
(id, name)
VALUES ($1,$2),($3,$4);
-- after
INSERT INTO users
(id, name)
(select * from unnest($1::int[], $2::int[]));
Where Next?
Trending in Questions
Other Trending Topics
Latest on Elixir Forum
Sponsor Spotlight
Deploy Phoenix to your own VPS with PaaS ease: push-to-deploy, zero downtime, auto SSL, managed Postgres. 14-day free trial at potions.io
Categories:
Sub Categories:
Forums
Popular Tags
- #ecto
- #liveview
- #troubleshooting
- #learning-elixir
- #library
- #deployment
- #erlang
- #testing
- #genserver
- #mix
- #absinthe
- #remote-other
- #otp
- #plug
- #how-to-question
- #macros
- #postgres
- #elixirconf
- #channels
- #exunit
- #discussion
- #code-sync
- #podcasts
- #javascript
- #onsite
- #dialyzer
- #docker
- #authentication
- #umbrella
- #full-time-contract
- #podcasts-by-brainlid
- #ecto-query
- #ai
- #elixirconf-us
- #blog-post
- #elixir-ls
- #phoenix_html
- #iex
- #graphql
- #genstage
- #websockets
- #supervisor
- #advent-of-code
- #distillery
- #processes
- #api
- #forms
- #elixirconf-eu
- #metaprogramming
- #hex
Our Sponsors
Supporting innovation across the BEAM ecosystem.
We build reliable cloud platforms for business-critical systems.
Catch errors, track performance, monitor hosts and more.
Error tracking, logs, uptime, and Just Enough APM. Built for developers.
Elixir, Erlang & BEAM conferences from Code Sync - join us in 2026!
Practical resources that improve the lives of professional developers.
**Building the future of software with AI, trust, and human connection.**
The deployment platform built for Elixir: PaaS ease, VPS control.
The team behind Membrane, Popcorn, LiveDebugger. Available for hire.
Courses that'll move you from confusion to "Aha, now I get it!"
Showing Posts 1 to 3- Show Best Posts
- Show All (oldest first)
- Show All (newest first)
LostKobrakai
Take a look at:
Though I also found jsonb_to_recordset quite useful:
MEHUL.JAIN
I think using Fragment directly for inserts does not work, what you have done with join will work in case of updates
MEHUL.JAIN
I have done this:
But how do I remove prefix from cte query? I have a multi tenant/schema application, so I need prefix when I would try to do
DBWrapper.insert_all(SchemaModule, query)