Hi,
On 2013-09-17 23:12:24 -0700, Sergey Konoplev wrote:
> How safe is it to use the technique described by the link below with
> system catalog tables to remove bloat?
>
> (in a couple of words it is about moving tuples to the beginning of
> the table with a special way of updating)
>
> http://www.depesz.com/2010/10/17/reduce-bloat-of-table-without-longexclusive-locks/
>
> Are there any caveats?
At least for pg_index it's not safe, we use the xmin of rows when
indcheckxmin = true.
I am not aware of other cases, but I'd be hesitant to do so.
You have bloat because of lots of temporary tables IIRC?
Greetings,
Andres Freund
-- Andres Freund http://www.2ndQuadrant.com/PostgreSQL Development, 24x7 Support, Training &
Services