November 2019
Beginner to intermediate
470 pages
11h 59m
English
Content preview from Mastering PostgreSQL 12 - Third Edition
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Making replication more reliable
In this chapter, we have already seen that setting up replication is easy and doesn't require a lot of effort. However, there are always some corner cases that can cause operational challenges. One of those corner cases is all about transaction log retention.
Consider the following scenario:
- A base backup is fetched.
- After the backup, nothing happens for 1 hour.
- The slave is started.
Keep in mind that the master does not care too much about the existence of the slave. Therefore, the transaction log needed for the slave to start up might not exist on the master anymore as it might have been removed by checkpoints already. The problem is that a resync is needed to be able to fire up the slave. In the case ...
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