URGENT: Site errors - deadlock victim

121 Posts | Latest reply on 21/08/2007 06:22:19 by Matt | Go to original / last post
TAT2DVEGAN's Profile
TAT2DVEGAN

In: manchester
Posts: 61
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I've just got this error... means nothing to me so I copied it here .   Microsoft OLE DB Provider for SQL Server error '80004005' Transaction (Process ID 142) was deadlocked on lock resources with another process and has been chosen as the deadlock victim. Rerun the transaction. /sites/bm/index.asp, line 446                                                                                                                                                                               
Matt's Profile
Matt

In: Veldhoven
Posts: 8054
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Oh crap - THAT ONE is a bad one - and unexpected (The line of code).   Eeek.   :-(   Im on a course this week Wed - Fri and my 2 tutors are both trying to help me figure this out.  But we're strugging.  Too many people connecting to the database every second and too many write requests.  :-(                                                                                                                                                                             
Sandi's Profile
Sandi

In: Huddersfield, W
Posts: 17948
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  make ya mind up, one minute not enough folk, the next, TOO MANY lol                                                                                                                                                                              
Matt's Profile
Matt

In: Veldhoven
Posts: 8054
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LOL                                                                                                                                                                             
Matt's Profile
Matt

In: Veldhoven
Posts: 8054
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ok the views column has been removed, and the constant UPDATE command stopped.   The query on the All Topics page has also been altered... but we're yet to find out what the impact will be on performance. Please monitor very closely for me over the next few hours and let me know how you get on. Cheers                                                                                                                                                                             
Matt's Profile
Matt

In: Veldhoven
Posts: 8054
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Oh my god I've never known the site to run so fast!   A big performance problem as I said was that EVERY time you viewed a topic, the view counter was updated.  This update added a lock on the database, which meant that if someone else opened the topic at the same time (or the All Forums page) then they got errors.   Let's see how it goes now, I'm amazed at how fast the site is running now but I'm not holding my breath                                                                                                                                                                             
Matt's Profile
Matt

In: Veldhoven
Posts: 8054
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I think I might have fixed it!  Without any expensive server upgrades etc.                                                                                                                                                                             
Matt's Profile
Matt

In: Veldhoven
Posts: 8054
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I can't wait to check the log files and see if there have been any problems today.  :-)   Has NOBODY received any deadlock errors?                                                                                                                                                                             
Matt's Profile
Matt

In: Veldhoven
Posts: 8054
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aaaaah the silence!   AND the log files state that nobody has had any deadlock or time out errors since I made yesterday's changes!   Many thanks to Hans and Anne-Marie from Globalknowledge if this has worked.                                                                                                                                                                             
Sandi's Profile
Sandi

In: Huddersfield, W
Posts: 17948
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  Nope not had any errors   It also looks tidier without the 'views' column and seems to load pages a bit quicker                                                                                                                                                                             
Matt's Profile
Matt

In: Veldhoven
Posts: 8054
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Yea theres more room for the subject title.   Yep the site is faster... a HELL of a lot faster!  No more database updates on every page. I honestly can't believe how fast the site is today.                                                                                                                                                                             
Matt's Profile
Matt

In: Veldhoven
Posts: 8054
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Due to the new circumstances RE performance and no more deadlocks, I've made some changes to the chatroom.   Namely: making refresh times 5 times faster.   This means 5 times more hits to the server for each chatroom user.   It could well cause the site to cripple again, but I hope not.   Anyhow - please could everyone watch the chatroom VERY closely and see how you get on with it.  You should see your posts coming up much faster, users appearing quicker etc.  If you get any errors though, I need to know them asap.   Thanks                                                                                                                                                                             
Matt's Profile
Matt

In: Veldhoven
Posts: 8054
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The last DEADLOCK error from the log files was precisely... 2007-08-16 14:54:24 PST (Pacific time).   That was 7:54pm last night in the UK... shortly before i applied my "fixes".   Please god PLEASE tell me it's fixed (So I can move on to the next thing haha).                                                                                                                                                                             
Matt's Profile
Matt

In: Veldhoven
Posts: 8054
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Please can I have some comments on this issue - how is everyone finding the site today and yesterday?  is it fast(er) and does it still crash???  Im back at work now, so I can't monitor the site much with regards to speed.  Therefore I'm relying on you all to advise me   Thanks                                                                                                                                                                             
rattler's Profile
rattler

In: Liverpool
Posts: 192
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UP until 20:30 today, it was slower than a second hand Lada.                                                                                                                                                                             
Matt's Profile
Matt

In: Veldhoven
Posts: 8054
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hmmmm - check your internet connection lol  I've been using it tongiht and it's definitely fast.   If you're not sure if its your internet connection or the website, you will see at the bottom of every page a "Page generated in 0.5625 seconds" bit.  This is how long it took to generate the page before you started downloading it.  It should never get to more than 2 seconds.  It could be 2 seconds even if it took 15 seconds for you to "download" the page to your PC.   Does that make sense? lol                                                                                                                                                                             
rattler's Profile
rattler

In: Liverpool
Posts: 192
0% Karma0% Karma 0% Karma0% Karma

Hmmm, time to twiddle with my pc. Right where's me lump ammer lol..                                                                                                                                                                             
Matt's Profile
Matt

In: Veldhoven
Posts: 8054
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lol, i could do with one of them for BM at the moment haha   Im so hoping its been fixed though, spent days trying to fix this.                                                                                                                                                                             
Matt's Profile
Matt

In: Veldhoven
Posts: 8054
100% Karma100% Karma 100% Karma100% Karma

ok so now that the site is running like a dread (current internet problems aside), I have re-enabled the "100 miles" and "National" options to searches.   Let me know if you have any problems, or if the site starts to slow down again.   ta                                                                                                                                                                             
Cruiser gal's Profile
Cruiser gal

In: Tamworth
Posts: 2011
0% Karma0% Karma 0% Karma0% Karma

Matt I had horrendous problems with bm last night, I couldn't log off once in there and then when I did I couldn't get back in. I was on chat to and it kept freezing on me, couldn't close it but couldn't post on it either, so ended up having my posts done by proxy, thanks Mate you know who you are. lol                                                                                                                                                                             


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