See my book, last chapter. pg_log is transaction log status.
pg_variable holds next object id and next transaction id.
http://www.postgresql.org/docs/awbook.html
> PostgreSQL gurus,
>
> I am in the process of writing a technical book featuring PostgreSQL (among
> other technologies). I would like to document the contents of the PGDATA
> directory. There are a few files there that I haven't been able to figure out.
> They are 'pg_logs' and 'pg_variables'. I can make an educated guess as to the
> contents, but I would prefer to hear from those in the know about what these
> files are used for.
>
> Thanks,
>
> -- Art Taylor
>
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--
Bruce Momjian | http://candle.pha.pa.us
pgman@candle.pha.pa.us | (610) 853-3000
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