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Corruption
Postgres FM
How to Fix Data Corruption in Table Files
A lot of databases have data check sums disabled, right? Because you need specifically enabled them. It's not easy if you have big database under load and maintenance window is not welcome. So they probably have data corruption in table files easily. Then it can be also in toast files, which are part of data files. For example, in indexes. Visibility map can be corrupted. But now just let's walk around and see how what else can be corrupted too.
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