long running select min(timestamp) query
Date: Mon, 28 Jan 2008 07:40:11 -0800 (PST)
I have a basic event table in my 10g database, primary integer key, and a nonnull timestamp "eventdate" field. When executing the following command:
select min(eventdate) from events;
It can occasionally take a VERY long time. There is a standard btree index on "eventdate", and roughly 20 other columns, a few of which also have basic btree indexes.
In my current scenario, the table has less than a million records, and the query seems to be taking upwards of 10 minutes!!! Here's what the console says the plan is:
Operation Object Object Type Order Rows Size (KB) Cost Time (sec) CPU Cost I/O Cost SELECT STATEMENT 3 4 SORT AGGREGATE 2 1 0.011 INDEX FULL SCAN (MIN/MAX) EVENTS_EVENTDATE INDEX 1 736195 7,908.345 4 1 28686 4
I've run the ADDM, it updated the stats, but that doesn't seem to help (i run it again it has no recommendations). Am i doing something silly with this table or is there some better way for me to phrase this query?
Bob Received on Mon Jan 28 2008 - 09:40:11 CST