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 -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
