I do have similar issue in my db that went live this week, except that the table is a partitioned table partitioned by a TIMESTAMP column (10G Rel 2) called TIME_IN .

I use the order by and “rownum” to fetch the first 10 rows. It works fine and gives me the result in less than a mille second if I keep a global index on the TIME_IN column. When I convert it into a local index, it takes one full minute. It is not performing index walking anymore.

The table has about 27 million rows in the table and we expect about 35 million per week. Our system went live just this week

Is there any explanation for this?

Thanks
Sundar R

The comments I chose to discuss were:

1) Objects should be compressed to one extent
2) Fragmented tablespaces are bad
3) Raw disks improve performance
4) Raw disk is hard to handle
5) Tablescans are bad
6) Foreign keys need to be indexed
7) Every site needs a full-time DBA

In outline, omitting a few of the details and caveats, the comments that went with them were along the lines of:

1) Waste of time (unless you were still running 5.1)

2) Doesn’t happen if you set things up properly

3) Maybe/Maybe not - depending on the quality your application design and code. (The discussions would probably be about direct I/O - in it’s various forms - now).

4) Not with logical volume managers (which had been around for a few years by then). (I don’t think anyone would bother to make this remark nowadays).

5) Not necessarily (This still has to be explained fairly frequently !)

6) Not necessarily (This still has to be explained fairly frequently !)

7) Times and working envirnoments change, but the point I was making with this one was that if a DBA doesn’t have to spend all their time dealing with design and coding errors, they can keep an eye on quite a lot of databases. At the time I was suggesting a couple of hours per week. (Funnily enough, the notes that go with that slide say that one of the things a DBA may have to do is an occasional index rebuild).

The closing slide was a bit of a classic, it said:

“If it’s going to make a big difference, don’t believe it until you’ve proved it.”

If I were to present that last slide today, I’d probably change it to “If it’s supposed to make a big difference …”.

Not this year - I had another engagement that collided with the dates.

I’ll be in Dallas for Hotsos ( http://www.hotsos.com/sym09.html ) next year, though, and hope to do both IOUG and OOW as well.