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PostgreSQL documentation
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<term><option>-P</option></term>
<listitem>
<para>
- Ignore system indexes while scanning/updating system tables. The
- <command>REINDEX</command> command for system tables/indexes
- requires this option to be used.
+ Ignore system indexes when reading system tables (but still update
+ the indexes when modifying the tables). This is useful when
+ recovering from damaged system indexes.
</para>
</listitem>
</varlistentry>