doc: Add a user documentation section for replica identity - #8
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The information about replica identity was spread over the ALTER TABLE reference page and a short subsection of the publication documentation, which left several user-visible aspects undocumented, for example how the subscriber searches for the row to modify, what a replica identity costs, and that ALTER TABLE ... REPLICA IDENTITY does not recurse to partitions. Add a dedicated "Replica Identity" section to the logical replication chapter, describing the available modes and what each of them writes to WAL, how to set and examine the replica identity, the requirements on the publisher and on the subscriber, the handling of partitioned tables, and the trade-offs of REPLICA IDENTITY FULL. The previous subsection in the publication documentation is replaced by a reference to the new section, and ALTER TABLE ... REPLICA IDENTITY now points to it as well. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01KhWjMve4rzoc4qyCuhSvgy
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The information about replica identity was spread over the ALTER TABLE
reference page and a short subsection of the publication documentation,
which left several user-visible aspects undocumented, for example how the
subscriber searches for the row to modify, what a replica identity costs,
and that ALTER TABLE ... REPLICA IDENTITY does not recurse to partitions.
Add a dedicated "Replica Identity" section to the logical replication
chapter, describing the available modes and what each of them writes to
WAL, how to set and examine the replica identity, the requirements on the
publisher and on the subscriber, the handling of partitioned tables, and
the trade-offs of REPLICA IDENTITY FULL. The previous subsection in the
publication documentation is replaced by a reference to the new section,
and ALTER TABLE ... REPLICA IDENTITY now points to it as well.
Co-Authored-By: Claude Opus 5 noreply@anthropic.com
Claude-Session: https://claude.ai/code/session_01KhWjMve4rzoc4qyCuhSvgy