February 2020
Intermediate to advanced
734 pages
38h 13m
English
Content preview from PostgreSQL 12 High Availability Cookbook - Third Edition
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At this point, the RECONNECT command and related server_fast_close parameter probably seem extremely handy. However, the process for doing this is also completely asynchronous.
Imagine we want to perform some maintenance on pgha1 and have issued the RECONNECT command. How do we know all client sessions have finally been redirected to the new target server? We could connect to the pgbouncer admin database and repeatedly issue SHOW SERVER commands, but that's highly inconvenient.
Instead, we should use the new WAIT_CLOSE command. This command will not return until all connections have cleared their close_needed flag. This makes it a perfect tool to pause until all sessions have completed a transition from one PostgreSQL server ...
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