Installing pgpool
The next pooling resource we will explore is named pgpool-II, but we'll refer to it simply as pgpool. This is another popular connection proxy, but it predates PgBouncer by almost a year, having been available since late 2006. The scope of pgpool is also much larger, providing functionality such as query-based replication, connection pooling, load balancing, parallel-query, and more.
Perhaps surprisingly, we won't discuss most of these features in this book. Interesting as they may be, these advanced features don't directly apply to building a highly available PostgreSQL cluster. Of course, we always encourage experimentation.
One feature pgpool exposes, which is directly relevant to this book, is server pooling. What does this ...
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