How do I find the last time that a PostgreSQL database has been updated?

Question

I am working with a postgreSQL database that gets updated in batches. I need to know when the last time that the database (or a table in the database)has been updated or modifie

Answer 1

It looks like you can use pg_stat_database to get a transaction count and check if this changes from one backup run to the next - see this dba.se answer and comments for more details