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doc PG 18 relnotes: adjust wording of initdb item 48814415d5a

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And move to the top of the incompatibility list.  This will impact users
more than any other incompatibility item because of pg_upgrade.
This commit is contained in:
Bruce Momjian 2025-06-07 11:06:25 -04:00
parent 1a857348e4
commit 37e5f0b61f
1 changed files with 18 additions and 21 deletions
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39
doc/src/sgml/release-18.sgml
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@ -53,6 +53,24 @@
<itemizedlist>
<!--
Author: Peter Eisentraut <peter@eisentraut.org>
2024-10-16 [04bec894a04] initdb: Change default to using data checksums.
-->
<listitem>
<para>
Change initdb default to enable data checksums
<ulink url="&commit_baseurl;04bec894a04">&sect;</ulink>
</para>
<para>
Checksums can be disabled with the new initdb option --no-data-checksums.
pg_upgrade requires matching cluster checksum settings, so this new
option can be useful to upgrade non-checksum old clusters.
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2025-01-16 [d7674c9fa] Seek zone abbreviations in the IANA data before timezone
@ -192,27 +210,6 @@ Change pg_backend_memory_contexts.level and pg_log_backend_memory_contexts() to
<para>
These were previously zero-based.
</para>
</listitem>
<!--
Author: Peter Eisentraut <peter@eisentraut.org>
2024-10-16 [04bec894a04] initdb: Change default to using data checksums.
-->
<listitem>
<para>
initdb defaults to enabling data checksums
<ulink url="&commit_baseurl;04bec894a04">&sect;</ulink>
</para>
<para>
The previous default behavior (checksums disabled) can be obtained using the
new option --no-data-checksums. Note that pg_upgrade will reject upgrading
between clusters with different checksum settings, so if the old cluster does
not have checksums enabled (the previous default), then the new cluster will
need to be initialized with --no-data-checksums in order to allow pg_upgrade
to succeed.
</para>
</listitem>
</itemizedlist>