Re: [GENERAL] plan-reading extensive tutorial?
On Tue, Apr 20, 2004 at 05:44:53PM +, Jeff Boes wrote: I'm having a devil of a time getting this installed on my system ... anybody here willing to give me a walk-through? I did it just yesterday, to show it to someone. What's the problem? Do you have the proper jdk and ant? Are they first in your $PATH? I know that on debian, for instance, when you type 'java' you get something that's free but which doesn't always work. -- Andrew Sullivan | [EMAIL PROTECTED] ---(end of broadcast)--- TIP 9: the planner will ignore your desire to choose an index scan if your joining column's datatypes do not match
Re: [GENERAL] plan-reading extensive tutorial?
On Mon, 19 Apr 2004, Gregory S. Williamson wrote: FWIW, this site gives: 404 - File Not Found These aren't the droids files you're looking for. Sorry, but that file could not be found. And believe you me, we looked! We checked all the likely directories, then all the unlikely directories, and even grepped through the RAM. We broke into all the computers on our nearby subnet and checked their directories, but still could not find anything. We checked underneath the cushions, but all we turned up was that remote we've been looking for since last year. We searched through the laundry bin, rummaged through the junk drawer, and even asked the neighbor if they had a copy (like they would tell us anyway - they still haven't returned that index.html we loaned them 3 weeks ago!) Are you really, really sure that's the correct file? [which is a lot better than the usual 404 message, you have to admit!] My favorite is: http://www.shartwell.freeserve.co.uk/humor-site/404server.htm ---(end of broadcast)--- TIP 5: Have you checked our extensive FAQ? http://www.postgresql.org/docs/faqs/FAQ.html
[GENERAL] plan-reading extensive tutorial?
In the docs it says Plan-reading is an art that deserves an extensive tutorial, which this is not. Is there one? I've gone beyond simple queries (which are performing well) to the more difficult queries (which aren't). e.g. 4 generation family tree implemented as a view using 14 left outer joins back into the same table. If I select only from it, the optimizer uses the primary key (single int4 field) in nested loop left join on all 14. If I join the view to another table, it wants to do it sequentially (the other table is just a single int4 field with 1 row. the field is the primary key and also has a foreign key constraint to the main table). I dont want exact help on this particular query. Posting every query I'm having a problem with to the mailing list is a waste of both my time and yours (and not really feasable since it requires all the table structures and data). I have tried the obvious with vacuum full analyze, and changing the settings (like enable_seqscan, join_collapse_limit, from_collapse_limit...). klint. +---+-+ : Klint Gore: Non rhyming: : EMail : [EMAIL PROTECTED] : slang - the: : Snail : A.B.R.I.: possibilities : : Mail University of New England : are useless : : Armidale NSW 2351 Australia : L.J.J. : : Fax : +61 2 6772 5376 : : +---+-+ ---(end of broadcast)--- TIP 9: the planner will ignore your desire to choose an index scan if your joining column's datatypes do not match
Re: [GENERAL] plan-reading extensive tutorial?
On Mon, 2004-04-19 at 08:35, Klint Gore wrote: In the docs it says Plan-reading is an art that deserves an extensive tutorial, which this is not. Is there one? I've gone beyond simple queries (which are performing well) to the more difficult queries (which aren't). Red Hat has a tool called Visual explain that shows explain output graphically: http://sources.redhat.com/rhdb/ It might help understand what's going on. Bye, Chris. ---(end of broadcast)--- TIP 6: Have you searched our list archives? http://archives.postgresql.org
Re: [GENERAL] plan-reading extensive tutorial?
Klint Gore wrote: In the docs it says Plan-reading is an art that deserves an extensive tutorial, which this is not. Is there one? I've gone beyond simple queries (which are performing well) to the more difficult queries (which aren't). Try this one.. http://www.gtsm.com/oscon2003/toc.html Shridhar ---(end of broadcast)--- TIP 7: don't forget to increase your free space map settings
