PG and undo logging

From: Ravi Krishna <sravikrishna3(at)gmail(dot)com>
To: pgsql-general(at)postgresql(dot)org
Subject: PG and undo logging
Date: 2015-05-23 20:34:48
Message-ID: CACER=P0AzL31T12KmiLEGoSiY-mya9LQfsF9i2diAWPJTKQdAw@mail.gmail.com
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Is it true that PG does not log undo information, only redo. If true,
then how does it bring a database back to consistent state during
crash recovery. Just curious.

thanks.

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