Hi Chiru , Thank you for your information. I send wals to standby server using "wal sender" processes. And I had checked logs but It was nothing. Best regards. Yoji -- View this message in context: http://postgresql.nabble.com/Streaming-replication-stacked-tp5880104p5880288.html Sent from the PostgreSQL - general mailing list archive at Nabble.com. -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general