question about database recover proceduers

From: jian xu <jamesxu(at)outlook(dot)com>
To: "pgsql-admin(at)lists(dot)postgresql(dot)org" <pgsql-admin(at)lists(dot)postgresql(dot)org>
Subject: question about database recover proceduers
Date: 2021-01-04 17:54:47
Message-ID: BL0PR02MB456116E56AE7851683FB1FBBA1D20@BL0PR02MB4561.namprd02.prod.outlook.com
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Hello,
my pg version is 11, I use pg_basebackup+wal archive files to backup the database. I tried to restore the db to the latest wal archive file.
I restored the pg_basebackup file first, restored wal archive files to the archive folder, and created the recovery.conf file, which only has the "restore_command" in it.
when I started up the pg service, it didn't recover any wal archive files from archive folder with restore_command.

may I know how pg determines which next wal archive file needs to be fetched from archive folder?
how to troubleshooting the recover procedure, and how to check if restore_command is called?

thanks,

James

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