Switchover/Switchback in PostgreSQL 9.3
PostgreSQL 9.3 has two key software updates making switchover/switchback easier in High Availability configurations. First, let’s address the software patches and their descriptions: 1. First patch was committed by Fujii Masao. Patch commit# 985bd7d49726c9f178558491d31a570d47340459 With this patch, the walsender process tries to send all outstanding WAL records to the standby in replication when the user shuts down the master. This means: a. All WAL records are synced between two servers after the clean shutdown of the master b. After promoting the standby to new master, the user can restart the stopped master as new standby without a fresh backup from new master. 2. Second patch was committed by Heikki Linnakangas in PostgreSQL 9.3. Patch commit# abfd192b1b5ba5216ac4b1f31dcd553106304b19 Before PostgreSQL version 9.3, streaming replication used to stop replicating if the timeline on the primary didn’t match the standby. This generally happens when the ...