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PostgreSQL Replication, Second Edition

PostgreSQL Replication, Second Edition

By : Hans-Jürgen Schönig
4.5 (4)
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PostgreSQL Replication, Second Edition

PostgreSQL Replication, Second Edition

4.5 (4)
By: Hans-Jürgen Schönig

Overview of this book

This book is ideal for PostgreSQL administrators who want to set up and understand replication. By the end of the book, you will be able to make your databases more robust and secure by getting to grips with PostgreSQL replication.
Table of Contents (17 chapters)
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16
Index

Deploying DDLs


Replicating just one table is clearly not enough for a productive application. Also, there is usually no way to ensure that the data structure never changes. At some point, it is simply necessary to deploy changes of the data structures (so-called DDLs).

The problem now is that Slony relies heavily on triggers. A trigger can fire when a row in a table changes. This works for all tables, but it does not work for system tables. So, if you deploy a new table or happen to change a column, there is no way for Slony to detect that. Therefore, you have to run a script to deploy changes inside the cluster to make it work.

Tip

PostgreSQL 9.3 and beyond have some basic functionality to trigger DDLs, but that is not enough for Slony. However, future versions of PostgreSQL might very well be capable of handling triggers inside DDLs. The same applies to PostgreSQL 9.4 replication slots. Let's see whether those features will be supported in the long run, and how.

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