February 2020
Intermediate to advanced
734 pages
38h 13m
English
Content preview from PostgreSQL 12 High Availability Cookbook - Third Edition
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Talking to the correct shard
In this section, we have chosen to represent database shards as PostgreSQL schema names. If our basic schema is named myapp, shard 1 would be myapp1, shard 15 would be myapp15, and so on. This is what we call the logical shard name.
Beyond this, shards should be independent of each other so that they can be relocated to another PostgreSQL server arbitrarily; however, if shards can be moved at will, how do we find them? In much the same way that LVM has a physical drive, logical shards have a corresponding physical shard. The physical shard is the server where the logical shard currently resides, as shown in the following diagram:
Elements such as clients, products, and vendors are shared resources that all PostgreSQL ...
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