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doc PG 18 relnotes: Add incompatibility note about checksums now default

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Reviewed-by: Tomas Vondra <tomas@vondra.me>
Discussion: https://www.postgresql.org/message-id/flat/CAKAnmmKwiMHik5AHmBEdf5vqzbOBbcwEPHo4-PioWeAbzwcTOQ%40mail.gmail.com
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Peter Eisentraut
2025-06-04 12:03:25 +02:00
parent f777d77387
commit 48814415d5
1 changed files with 21 additions and 0 deletions
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21
doc/src/sgml/release-18.sgml
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@ -192,6 +192,27 @@ 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>