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This new option instructs initdb to skip synchronizing any files in database directories, the database directories themselves, and the tablespace directories, i.e., everything in the base/ subdirectory and any other tablespace directories. Other files, such as those in pg_wal/ and pg_xact/, will still be synchronized unless --no-sync is also specified. --no-sync-data-files is primarily intended for internal use by tools that separately ensure the skipped files are synchronized to disk. A follow-up commit will use this to help optimize pg_upgrade's file transfer step. The --sync-method=fsync implementation of this option makes use of a new exclude_dir parameter for walkdir(). When not NULL, exclude_dir specifies a directory to skip processing. The --sync-method=syncfs implementation of this option just skips synchronizing the non-default tablespace directories. This means that initdb will still synchronize some or all of the database files, but there's not much we can do about that. Discussion: https://postgr.es/m/Zyvop-LxLXBLrZil%40nathan |
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