PostgreSQL 11 Administration Cookbook
by Simon Riggs, Gianni Ciolli, Sudheer Kumar Meesala, Sheldon Strauch
How it works…
Recovery works by applying individual WAL records. These correspond to individual block changes, so there are many WAL records for each transaction. The final part of any successful transaction is a commit WAL record, though there are abort records as well. Each transaction completion record has a timestamp that allows us to decide whether or not to stop at that point.
You can also define a recovery target using a transaction ID (xid), though finding out which xid to use is somewhat difficult, and you may need to refer to external records, if they exist. Using a Log Sequence Number (LSN) is also possible, and equally tricky; in both cases, you can get an idea of what transaction IDs, or LSN, to use, by inspecting the contents ...
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