2011/1/17 KaiGai Kohei <kai...@ak.jp.nec.com>: > Are you talking about an idea to apply toast id as an alternative key?
No, probably. I'm just talking about whether "diff -q A.txt B.txt" and "diff -q A.gz B.gz" always returns the same result or not. ... I found it depends on version of gzip. So, if we use such logic, we cannot improve toast compression logic because the data is migrated by pg_upgrade. > I did similar idea to represent security label on user tables for row > level security in the v8.4/9.0 based implementation. Because a small > number of security labels are shared by massive tuples, it is waste of > space if we have all the text data being toasted individually, not only > performance loss in toast/detoast. It looks the same issue as large object rather than the discussion here. We have vacuumlo in contrib to solve the issue. So, we could have vacuumlo-like special sweeping logic for the security label table. -- Itagaki Takahiro -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
