The following documentation comment has been logged on the website:
Page: https://www.postgresql.org/docs/9.6/static/wal-configuration.html
Description:
In this section:
"At checkpoint time, all dirty data pages are flushed to disk and a special
checkpoint record is written to the log file. (The change records were
previously flushed to the WAL files.)"
I am confused by what the part in parenthesis means by "previously". This
may only reflect my ignorance, but I don't know if "previously" means "in
previous versions of Postgres" or "before the checkpoint" or something
else.
Mostly because of this, I don't understand what this statement means. Thank
you.