February 2020
Intermediate to advanced
734 pages
38h 13m
English
Content preview from PostgreSQL 12 High Availability Cookbook - Third Edition
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If the initial synchronization has been running for a protracted duration, the last check we supplied may report very different values. After all, pg-old is still receiving new rows for all tables, and the snapshot for the initial synchronization to pg-new may have been established hours, or even days ago.
Luckily, we can actually exploit the same trick pglogical used when creating the transaction snapshot. Since it needs the snapshot to ensure every COPY statement is consistent, we can actually use the transaction ID as well.
So long as we connect as a superuser, it's possible to specify the transaction snapshot ID and see the same thing as pglogical while it sends data to pg-new.
If we want to do this, we merely need to obtain ...
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