>Any changes occur between the time it worked and the time it did not? >Say a crash, change in schema, new data added and so on. Not as far as we can tell - one of my DB team noticed it day before yesterday - there were no tell tale signs of any issues but we have seen issues yesterday with certain records not being found >Per below the version 10 servers use en_GB.UTF_8 and the production one en_US.UTF-8. >Why the difference? >And did the production used to be en_GB.UTF_8? All servers used to be en_US as I think that was the default and had been setup early in our use of PG. I suspect our devops guy corrected this during the upgrade. >Have you logged into the production instance using psql and tried the queries to see if they work? Not via psql, but as I said we saw issues from our app layer. I will do a similar test with psql and let you know Z
