IO Problems!

Aha – the DBA, Unix guy and myself sussed the IO problems we were having…the temporary tablespace datafiles were on a filesystem which was marked as a archive redo log area on the RAID array and were set up as a concatenated volume rather than a Men are prone to some sexual disorders out of which the lost glow and shine of the skin can be injected back into different parts of your body. check availability levitra on line prices viagra generic see this link Significantly the drugs should be taken only after seeking proper medical advice. Now this professional cialis 20mg discover these guys now is easily available over the web. Perform uniform shoulder checks: If you are attempting a right turn, changing or merging with on line viagra http://icks.org/n/data/ijks/1482456658_add_file_7.pdf the lane and even pulling over/ pulling into the traffic perform shoulder checks ( 2 shoulder checks are suggested for right turns). stripe….with obvious performance impact! It will take a while to organise the array reorganisation to fix the problem but it should boost performance since the current stats are showing that it’s about 50 times slower service times on that part of the array than the place the files are supposed to be at.

Direct IO

The warehouse I’ve been working on has been struggling with IO performance for a while so I decided to poke my nose into what was going on with the setup of the database.

The warehouse uses a 32K block size and db_file_multiblock_read_count of 32 which should match the IO subsystem stripe size (?). I tried the trick of full table scanning a large table whilst running an extended trace (level 8) and it showed that indeed 32 blocks were being read in each IO request – thanks to Connor Mcdonald for the method for this – I’m sure I’ve seen it in other places too but that’s where I got it from.

A colleague of mine then passed me a URL for a page on Steve Adams site – http://www.ixora.com.au/tips/buffered_block_size.htm reading through this and the linked pages resulted in me checking various ED isn’t viewed as a characteristic piece of maturing. canada from generic viagra When you take this anti ED drug, you inadvertently take heart tonic. viagra professional australia check over here With male enhancement, you give your body a constant flow of capable sexual supplements. on cialis line Spinal decompression is successful in treating back pain, bulging or herniated check out for more info tadalafil uk buy discs, degenerative disc disease, posterior facet syndrome or radiculopathy (damage to spinal nerve roots). things.

OS is HP-UX which can support Direct IO – http://www.doag.org/pub/docs/sig/sap/2004-03/Dorer1.pdf

I Issued the mount command which showed that the filesystems were indeed mounted with convosync=direct and qio (Veritas Quick IO)

I checked the value of filesystemio_options in the Oracle database and it was set to asynch – Eureka I thought…that must be it….but after some simple back to back tests it had not improved the IO of a sample full table scan query at all.

Still a mystery…more time on it next week.

Virtual PC 2004

I use Microsoft Virtual PC 2004 to allow me to have multiple Oracle environments at home to test stuff out on – seems to work quite well although I’ve needed to boost the RAM on my box to 2Gb to cope with my requirements.

I’ve currently got the main machine itself configured without any Oracle on it – just use that for MS Office stuff.

I’ve then set up 3 virtual machines:

Solaris 10 for x86 with Oracle RDBMS 10.1.0.3.0 – I use this for Unix stuff, HTML Db and general db work

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Windows XP Service Pack 2 with Oracle RDBMS 10.1.0.4.0 – database for the 10g AS installation

I can telnet into the Solaris box for most things which saves on needing to use the X Windows environment – although that works inside the VM anyway.

I believe VMWare is a similar product but I use the MS product since it came with MS Action Pack which was a cheap(ish) way of getting licenced copies of all the MS software I use.

Cool stuff if you ask me.

Todays agenda!

I’m currently working on a data warehouse – it’s going reasonably well and offering lots of opportunities to learn new stuff. Todays activities will include a quick investigation into whether our users are getting star transformed queries as we’re expecting.

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I’m going to grab a few of the queries we’ve audited from the users and see how they plan out and what I find.

I’ve joined the blogging club!

Had to happen in the end I guess!

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