>> Yeah. I think we need some from help backend for this. For example, a >> parameter status message can be used here. If PostgreSQL moves to the >> recovery state or vice versa, PostgreSQL sends the parameter status >> message to frontend. >> > > If we would use parameter status messages, then can we handle compatibility > correctly? So that new psql can work with old backend without errors (and > without recovery status display, for sure),
I suppose so. > and old psql can work with new > backend without errors. It should work because any frontend program should ignore parameter status messages they do not know, according to the docs. > Because seeing recovery status in psql prompt is very neat. But execution > of extra query each time doesn't seem like reasonable price for it... I think so. Best regards, -- Tatsuo Ishii SRA OSS, Inc. Japan English: http://www.sraoss.co.jp/index_en.php Japanese:http://www.sraoss.co.jp
