the finish LSN (i.e., 0/14C0379). The current position of
origins can be seen in the <link linkend="view-pg-replication-origin-status">
<structname>pg_replication_origin_status</structname></link> system view.
Please note that skipping the whole transaction includes skipping changes that
might not violate any constraint. This can easily make the subscriber
inconsistent.
The additional details regarding conflicting rows, such as their origin and
commit timestamp can be seen in the <literal>DETAIL</literal> line of the
log. But note that this information is only available when
<link linkend="guc-track-commit-timestamp"><varname>track_commit_timestamp</varname></link>
is enabled on the subscriber. Users can use this information to decide
whether to retain the local change or adopt the remote alteration. For
instance, the <literal>DETAIL</literal> line in the above log indicates that
the existing row was modified locally. Users can manually perform a
remote-change-win.
</para>
<para>
When the
<link linkend="sql-createsubscription-params-with-streaming"><literal>streaming</literal></link>
mode is <literal>parallel</literal>, the finish LSN of failed transactions
may not be logged. In that case, it may be necessary to change the streaming
mode to <literal>on</literal> or <literal>off</literal> and cause the same
conflicts again so the finish LSN of the failed transaction will be written
to the server log. For the usage of finish LSN, please refer to <link
linkend="sql-altersubscription"><command>ALTER SUBSCRIPTION ...
SKIP</command></link>.
</para>
</sect1>
<sect1 id="logical-replication-restrictions">
<title>Restrictions</title>
<para>
Logical replication currently has the following restrictions or missing
functionality. These might be addressed in future releases.
</para>
<itemizedlist>
<listitem>
<para>
The database schema and DDL commands are not replicated. The initial
schema can be copied by hand using <literal>pg_dump
--schema-only</literal>. Subsequent schema changes would need to be kept
in sync manually. (Note, however, that there is no need for the schemas
to be absolutely the same on both sides.) Logical replication is robust
when schema definitions change in a live database: When the schema is
changed on the publisher and replicated data starts arriving at the
subscriber but does not fit into the table schema, replication will error
until the schema is updated. In many cases, intermittent errors can be
avoided by applying additive schema changes to the subscriber first.
</para>
</listitem>
<listitem>
<para>
Sequence data is not replicated. The data in serial or identity columns
backed by sequences will of course be replicated as part of the table,
but the sequence itself would still show the start value on the
subscriber. If the subscriber is used as a read-only database, then this
should typically not be a problem. If, however, some kind of switchover
or failover to the subscriber database is intended, then the sequences
would need to be updated to the latest values, either by copying the
current data from the publisher (perhaps
using <command>pg_dump</command>) or by determining a sufficiently high
value from the tables themselves.
</para>
</listitem>
<listitem>
<para>
Replication of <command>TRUNCATE</command> commands is supported, but
some care must be taken when truncating groups of tables connected by
foreign keys. When replicating a truncate action, the subscriber will
truncate the same group of tables that was truncated on the publisher,
either explicitly specified or implicitly collected via
<literal>CASCADE</literal>, minus tables that are not part of the
subscription. This will work correctly if all affected tables are part
of the