Hi, I gave a talk at PostgreSQL Conference Europe 2012 Talk. Here is the slide I used (in English). http://www.sraoss.co.jp/event_seminar/2012/20121024_pgpool-II_pgconfEU2012_sraoss.pdf -- Tatsuo Ishii SRA OSS, Inc. Japan English: http://www.sraoss.co.jp/index_en.php Japanese: http://www.sraoss.co.jp