You can also now perform in-place upgrades for PostgreSQL clusters to newer versions without any downtime. If your application fails to connect during one of these events and is not configured to attempt a reconnect, this may cause disruptions in your applications service even if the node or standby node is back online and ready to accept requests.
However, the write-ahead log backs up every five minutes, so the most recent writes to the database may be lost if the cluster needs to recover this way. If there are no running nodes to copy data from, the database cluster reprovisions nodes using the most recent backup and the write-ahead log to recover the database to as close to the point of failure as possible. Provisioning a new replacement node takes time, but failing over to a standby node is immediate. The standby node is immediately promoted to primary and begins serving requests while a replacement standby node is provisioned in the background. The amount of time it takes to reprovision a node depends the amount of data being stored larger databases require more time. They provide geographically distinct, horizontal read scaling.ĭatabase clusters must have at least one standby node to be highly available because standby nodes provide redundancy for the primary node. Standby nodes can be added to an existing cluster at any time, with the exception of 15month single node clusters.
It has support for rich data types, atomic operations, and Lua scripting.
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