The new Hot Standby feature in the upcoming PostgreSQL 9.0 allows running queries against standby nodes that previously did nothing but execute a recovery process. Two common expectations I've heard from users anticipating this feature is that it will allow either distributing short queries across both nodes, or allow running long reports against the standby without using resources on the master. These are both possible to do right now, but unless you understand the trade-offs involved in how Hot Standby works there can be some unanticipated behavior here.
Standard Long-running Queries
One of the traditional problems in a database using MVCC, like PostgreSQL, is that a long-running query has to keep open a resource--referred to as a snapshot in the current Postgres implementation--to
Due to the weather related travel issues this week, the launch party we had planned for this Friday has been canceled.
Checkpoints can be a major drag on write-heavy PostgreSQL installations. The first step toward identifying issues in this area is to monitor how often they happen, which just got an easier to use interface added to the database recently.
Come on-line and discuss the features set of Hot Standby for PostgreSQL 8.5.
Meeting is for anybody planning to actively use the Hot Standby in the
next main release of PostgreSQL. Major focus is on providing user
feedback direct to developers to guide the final weeks of development
before we go into Beta.
After the earthquake that shook the city of L'Aquila and the entire
Abruzzo region, 2ndQuadrant Italia is pleased to announce the signing
of a collaborative agreement with the University of L'Aquila.