On Saturday March 25 2006 9:49 pm, Ed L. wrote: > On Saturday March 25 2006 9:36 pm, Ed L. wrote: > > I have a performance riddle, hoping someone can point me in > > a helpful direction. We have a pg 8.1.2 cluster using > > Apache::Sessions and experiencing simple UPDATEs taking > > sometimes 30+ seconds to do a very simply update, no foreign > > keys, no triggers: > > > > Table "public.sessions" > > Column | Type | Modifiers > > -----------+---------------+----------- > > id | character(32) | not null > > a_session | text | > > Indexes: > > "sessions_pkey" PRIMARY KEY, btree (id) > > The table has 6800 rows over 18000 pages, and is getting a > minimum of many tens of thousands of updates per day with > queries like this: > > UPDATE sessions SET a_session = ? WHERE id = ? Sorry, it's getting late. Yes, the table has been analyzed and explain shows an index scan is occurring. Ed
