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PostgreSQL 10 Administration Cookbook - Fourth Edition
book

PostgreSQL 10 Administration Cookbook - Fourth Edition

by Simon Riggs, Gianni Ciolli
May 2018
Intermediate to advanced content levelIntermediate to advanced
576 pages
30h 25m
English
Packt Publishing
Content preview from PostgreSQL 10 Administration Cookbook - Fourth Edition

How it works…

Streaming replication connects to a virtual database called replication. We do this because the WAL data contains changes to objects in all databases, so in a way, we aren't just connecting to one database—we are connecting to all of them.

Streaming replication connects similar to a normal user, except that instead of a normal user process, we are given a WALSender process.

You can set a connection limit on the number of replication connections in two ways:

  • At the role level by issuing the following command:
ALTER ROLE replogin CONNECTION LIMIT 2;
  • By limiting the overall number of WALSender processes via the max_wal_senders parameter

Always allow one more connection than you think is required, to allow for disconnections ...

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Publisher Resources

ISBN: 9781788474924Supplemental Content