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pg_ivm is an extension module for PostgreSQL 14 that provides an Incremental View Maintenance (IVM) feature.That means that materialized views are updated immediately after a base table is modified.
pg_ivm gives answer to the age old problem of when to refresh the materialized view. As a refresher or reminder, a materialized view versus a normal view is that the former keeps a copy of the data referenced to speed up querying since you actually query that copy, while the latter performs a live query every time.
That might be great, but not ideal as you have to decide when to refresh that copy in order to avoid querying stale data.Until now in Postgres this could be done when running the command REFRESH MATERIALIZED VIEW. But again, when is the right time to run it, given the performance aspect of the time it takes for the operation to complete?
full article on i-programmer:
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