to <literal>always</literal>, and the standby will call the archive

command for every WAL segment it receives, whether it's by restoring

from the archive or by streaming replication. The shared archive can

be handled similarly, but the archive_command must test if the file

being archived exists already, and if the existing file has identical

contents. This requires more care in the archive_command, as it must

be handled similarly, but the <varname>archive_command</varname> must

test if the file being archived exists already, and if the existing file

has identical contents. This requires more care in the

<varname>archive_command</varname>, as it must

be careful to not overwrite an existing file with different contents,

but return success if the exactly same file is archived twice. And

all that must be done free of race conditions, if two servers attempt

start_autovac_launcher= false;/* signal processed */

}

if (PgStatPID==0&&pmState==PM_RUN)

PgStatPID=pgstat_start();