<para>

<function>gin_index_check</function> tests that its target GIN index

has consistent parent-child tuples relations (no parent tuples

require tupleadjustement) and page graph respects balanced-tree

require tupleadjustment) and page graph respects balanced-tree

invariants (internal pages reference only leaf page or only internal

pages).

</para>

<entry>PostgreSQL 18 and later</entry>

<entry>Current latest version. The secret key used in query

cancellation was enlarged from 4 bytes to a variable length field. The

BackendKeyData message was changed toaccomodate that, and the CancelRequest

BackendKeyData message was changed toaccommodate that, and the CancelRequest

message was redefined to have a variable length payload.

</entry>

</row>

</para>

<para>

Note that if <option>--no-sync-data-files</option> is used in

conjuction with <option>--sync-method=syncfs</option>, some or all of

conjunction with <option>--sync-method=syncfs</option>, some or all of

the aforementioned files and directories will be synchronized because

<literal>syncfs</literal> processes entire file systems.

</para>

<productname>PostgreSQL</productname> itself and memory allocated

by extensions using the mechanisms detailed in

<xref linkend="xfunc-shared-addin" />. This view will output multiple rows

for each of the shared memory segments provided that they are spreadaccross

for each of the shared memory segments provided that they are spreadacross

multiple NUMA nodes. This view should not be queried by monitoring systems

as it is very slow and may end up allocating shared memory in case it was not

used earlier.