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Add wal_sync_method=fdatasync for Windows.

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Windows 10 gained support for flushing NTFS files with fdatasync()
semantics.  The main advantage over open_datasync (in Windows API terms
FILE_FLAG_WRITE_THROUGH) is that the latter does not flush SATA drive
caches.  The default setting is not changed, so users have to opt in to
this.

Discussion: https://postgr.es/m/CA%2BhUKGJZJVO%3DiX%2Beb-PXi2_XS9ZRqnn_4URh0NUQOwt6-_51xQ%40mail.gmail.com
This commit is contained in:
Thomas Munro
2022-07-20 13:50:57 +12:00
parent b24b2be119
commit 9430fb407b
10 changed files with 86 additions and 6 deletions
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3
doc/src/sgml/wal.sgml
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@ -108,7 +108,8 @@
<literal>open_datasync</literal> (the default), write caching can be disabled
by unchecking <literal>My Computer\Open\<replaceable>disk drive</replaceable>\Properties\Hardware\Properties\Policies\Enable write caching on the disk</literal>.
Alternatively, set <varname>wal_sync_method</varname> to
<literal>fsync</literal> or <literal>fsync_writethrough</literal>, which prevent
<literal>fdatasync</literal> (NTFS only), <literal>fsync</literal> or
<literal>fsync_writethrough</literal>, which prevent
write caching.
</para>
</listitem>