How do I correctly use% p and% f in postgresql.conf to create the Write Ahead protocol?

I am trying to change postgresql.conf (Postgre SQL 10.0 on Ubuntu 18.04 VPS) to set up the Write Ahead Log (WAL).

AIUI, the commands should be:

wal_level = replica             # minimal, replica, or logical
archive_mode = on               # enables archiving; off, on, or always
                                # (change requires restart)
archive_command = 'cp %p /var/lib/postgresql/10/main/pg_wal/%f'          
archive_timeout = 600           # force a logfile segment switch after this
                                # number of seconds; 0 disables

AIUI,% p refers to the database file (to be archived) and% f refers to the file name that contains the copy of this database file.

In this case: I want to copy the database file to the / pg_wal directory every 5 minutes.

However, this is clearly not correct, as the error log files show:

cp: 'pg_wal/000000010000000000000002' and '/var/lib/postgresql/10/main/pg_wal/000000010000000000000002' are the same file
2020-02-16 21:01:05.857 UTC (20707) LOG:  archive command failed with exit code 1
2020-02-16 21:01:05.857 UTC (20707) DETAIL:  The failed archive command was: cp pg_wal/000000010000000000000002 /var/lib/postgresql/10/main/pg_wal/000000010000000000000002

So I'm not sure how to use% p and / or% f. If anyone could present the syntax, I would be very grateful.

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Search results – Type Ahead does not work

We use our custom display template with the results script web part

We are unable to advance the work

I tried it below

  1. Set the client type to: ContentSearchRegular
  2. Set the client type: SiteQuery-All
  3. Set the result type in the display template
  4. In the response object of the search result object, search for piPageImpression

Hints would be greatly appreciated

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kotlin – Use GOOGLE MAPS to find out if one coordinate is ahead of another with a defined direction / direction

I'm developing an app to get time estimates based on a set of points (lat, lng). The estimates are based on a given trajectory (defined polyline).
Can I know when one point is earlier than another?
In other words, I know if the coordinate A (22.1305, -104.12541) lies before the coordinate B (22.1069, -102.3657).

** Visually, it's easy, as shown below, in the order that interests me, that the A stands in front of the B
Enter image description here

I hope you can help me!
Development in Kotlin with Google Maps

USA – Are airlines or air traffic controllers intentionally trying to land some flights ahead of schedule?

On some domestic flights in the US, the flight reached its destination earlier than expected, but then stopped on the asphalt and waited for the opening of the assigned gate.

Are airlines and / or air traffic controllers deliberately trying to land some flights ahead of schedule? If so, what if a flight lands before the incoming gate is available?

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