On Wed, Dec 28, 2011 at 5:34 PM, Yi Lu <y...@ramsoft.biz> wrote:
> It is feasible to roll over the transaction ID without putting the database
> offline? i.e. when ID is close to limit, reset it to 0 from the code?

Seems that PostgreSQL AutoVacuum daemon do that for Postgresql databases :

http://www.postgresql.org/docs/8.3/static/routine-vacuuming.html

"PostgreSQL's VACUUM command has to run on a regular basis for several reasons:
...
 To protect against loss of very old data due to transaction ID wraparound"

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