Jim Nasby wrote:
Yeah, especially since you mentioned this being for backups. I suspect you *want* those WAL records marked with 0, because that tells you that you can't rely on WAL when you back that data up.

Thanks, you right if you doing incremental backup you try compare every page LSN with last backup LSN. For my page tracking system (ptrack) it is secondary cheks but for classic pg_arman algorithm it is main approach. If Invalid LSN will be realy sign of broken page header it help for third-party applications.

Yury Zhuravlev
Postgres Professional: http://www.postgrespro.com
The Russian Postgres Company

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