I'm having a problem restoring a copy of a PostgreSQL database to another server.
I have taken a backup using the pg_basebackup
tool and can restore that but when I restore WAL logs from the archive I get this error
WAL file is from different database system: WAL file database system identifier is 6355383437015733568
, pg_control
database system identifier is 6366125487137379747
Though the source database reports it's identifier as WAL file is from different database system: WAL file database system identifier is 6355383437015733568
, pg_control
database system identifier as 6366125487137379747
I am 100% certain the the WAL archive is from the correct source it just looks like the WAL files have the wrong id . any ideas how to resolve ? a pg_xlogreset
in the source db made no difference
Version 9.6 on Amazon Linux all fully patched
Thanks
Best Answer
Can it be what archive already filled with WAL from another installation? Postgres documentation specifies that archive_command should not overwrite WAL files in archive (https://www.postgresql.org/docs/9.6/static/continuous-archiving.html):
So if archive is set up correctly it will refuse to override WAL and restore will fail.