>> For TRIGGER, I cannot thinking of any way. Any idea will be
>> welcome.
> It would require creating "cooperating" triggers in the database and
> having a listener, but you might consider the
> triggered_change_notifications() trigger function included in 9.2. 
> It works at least as far back as 9.0; I haven't tried it any further
> back.

Thanks for the info. It's a little bit overkill for my purpose though.
(on busy systems, the notification would be too frequent).

I would think that creating a small routine periodically consults
pg_stat_all_tables view and records the last update datetime for each
table (unfortunately the view does not have last modification date).
Tatsuo Ishii
SRA OSS, Inc. Japan
English: http://www.sraoss.co.jp/index_en.php
Japanese: http://www.sraoss.co.jp

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