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In pg_dump, dump SEQUENCE SET items in the data not pre-data section.
Represent a sequence's current value as a separate TableDataInfo dumpable object, so that it can be dumped within the data section of the archive rather than in pre-data. This fixes an undesirable inconsistency between the meanings of "--data-only" and "--section=data", and also fixes dumping of sequences that are marked as extension configuration tables, as per a report from Marko Kreen back in July. The main cost is that we do one more SQL query per sequence, but that's probably not very meaningful in most databases. Back-patch to 9.1, since it has the extension configuration issue even though not the --section switch.
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‎doc/src/sgml/ref/pg_dump.sgml

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@@ -739,11 +739,11 @@ PostgreSQL documentation
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sections. The default is to dump all sections.
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</para>
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<para>
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The data section contains actual table data as well as large-object
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definitions.
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Post-data items consist of definitions of indexes, triggers, rules
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The data section contains actual table data, large-object
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contents, and sequence values.
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Post-data items include definitions of indexes, triggers, rules,
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and constraints other than validated check constraints.
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Pre-data items consist of all other data definition items.
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Pre-data items include all other data definition items.
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</para>
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</listitem>
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</varlistentry>

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