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Document restrictions regarding incremental backups and standbys.

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If you try to take an incremental backup on a standby and there hasn't
been much system activity, it might fail. Document why this happens.
Also add a hint to the error message you get, to make it more likely
that users will understand what has gone wrong.

Laurenz Albe and Robert Haas

Discussion: https://postgr.es/m/5468641ad821dad7aa3b2d65bf843146443a1b68.camel@cybertec.at
This commit is contained in:
Robert Haas
2024-07-25 15:45:06 -04:00
parent 6622da8d3c
commit de8b098ce5
2 changed files with 13 additions and 1 deletions
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3
src/backend/backup/basebackup_incremental.c
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@@ -441,7 +441,8 @@ PrepareForIncrementalBackup(IncrementalBackupInfo *ib,
errmsg("manifest requires WAL from final timeline %u ending at %X/%X, but this backup starts at %X/%X",
range->tli,
LSN_FORMAT_ARGS(range->end_lsn),
LSN_FORMAT_ARGS(backup_state->startpoint))));
LSN_FORMAT_ARGS(backup_state->startpoint)),
errhint("This can happen for incremental backups on a standby if there was little activity since the previous backup.")));
}
else
{