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• Using photos from network drive with Windows 8 photo app

  - by Paul

  I have photos on my network drive that I want to display (in live tiles preferably in the photo app). Under c:\users\paul\pictures I have made a link to them, using mklink /d: And this works fine in classic: But nothing appears in the photo.app: I am guessing that this is an issue with indexing - the photos won't appear until they are indexed, and Windows won't normally index a network drive (unless you make it "available offline, which just copies the files locally) - but this is exactly what the mklink was supposed to work around, and the properties show it is indexable: Any ideas?

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• Automount of AFP shares on Lion clients from OS X Snow Leopard server - not working right

  - by Paul

  Recently upgraded Snow Leopard clients to Lion. AFP shares are set up as login items. The network shares on some of the machines now take a long time to come up (10 minutes). Several machines that were upgraded are acting normally, and three machines with clean installs of Lion (not upgraded) are also working normally. Is there a network file causing a conflict on some of these client machines? Thanks, Paul

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• How to AUTOMATICALLY open all links (flash streams) in different tabs or windows IE9, Safari, or Firefox?

  - by Paul M

  Is there a way to AUTOMATICALLY open all links in a given website in different tabs or windows? I've tried "snap link plus", but it didn't work on this particular website: http://www.teledunet.com To open others streams on this website (found on the left hand side of the page), you would need to login using (cmoi123 / 12345) by clicking on "Connexion" on the top right side of the main page). Thank You In Advance! -Paul

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• I changed the repository and now my ubuntu software center crashes

  - by Paul Menz

  paul@ubuntu:~$ software-center 2012-10-24 18:11:04,665 - softwarecenter.ui.gtk3.app - INFO - setting up proxy 'None' 2012-10-24 18:11:04,671 - softwarecenter.db.database - INFO - open() database: path=None use_axi=True use_agent=True 2012-10-24 18:11:05,191 - softwarecenter.backend.reviews - WARNING - Could not get usefulness from server, no username in config file 2012-10-24 18:11:05,403 - softwarecenter.ui.gtk3.app - INFO - show_available_packages: search_text is '', app is None. 2012-10-24 18:11:05,920 - softwarecenter.db.pkginfo_impl.aptcache - INFO - aptcache.open() Traceback (most recent call last): File "/usr/share/software-center/softwarecenter/db/pkginfo_impl/aptcache.py", line 243, in open self._cache = apt.Cache(GtkMainIterationProgress()) File "/usr/lib/python2.7/dist-packages/apt/cache.py", line 102, in __init__ self.open(progress) File "/usr/lib/python2.7/dist-packages/apt/cache.py", line 149, in open self._list.read_main_list() SystemError: E:Malformed line 63 in source list /etc/apt/sources.list (dist parse) 2012-10-24 18:11:07,255 - softwarecenter.db.enquire - ERROR - _get_estimate_nr_apps_and_nr_pkgs failed Traceback (most recent call last): File "/usr/share/software-center/softwarecenter/db/enquire.py", line 115, in _get_estimate_nr_apps_and_nr_pkgs tmp_matches = enquire.get_mset(0, len(self.db), None, xfilter) File "/usr/share/software-center/softwarecenter/db/appfilter.py", line 89, in __call__ if (not pkgname in self.cache and File "/usr/share/software-center/softwarecenter/db/pkginfo_impl/aptcache.py", line 263, in __contains__ return self._cache.__contains__(k) AttributeError: 'NoneType' object has no attribute '__contains__' Traceback (most recent call last): File "/usr/bin/software-center", line 176, in <module> app.run(args) File "/usr/share/software-center/softwarecenter/ui/gtk3/app.py", line 1422, in run self.show_available_packages(args) File "/usr/share/software-center/softwarecenter/ui/gtk3/app.py", line 1352, in show_available_packages self.view_manager.set_active_view(ViewPages.AVAILABLE) File "/usr/share/software-center/softwarecenter/ui/gtk3/session/viewmanager.py", line 154, in set_active_view view_widget.init_view() File "/usr/share/software-center/softwarecenter/ui/gtk3/panes/availablepane.py", line 171, in init_view self.apps_filter) File "/usr/share/software-center/softwarecenter/ui/gtk3/views/catview_gtk.py", line 238, in __init__ self.build(desktopdir) File "/usr/share/software-center/softwarecenter/ui/gtk3/views/catview_gtk.py", line 511, in build self._build_homepage_view() File "/usr/share/software-center/softwarecenter/ui/gtk3/views/catview_gtk.py", line 271, in _build_homepage_view self._append_whats_new() File "/usr/share/software-center/softwarecenter/ui/gtk3/views/catview_gtk.py", line 450, in _append_whats_new whats_new_cat = self._update_whats_new_content() File "/usr/share/software-center/softwarecenter/ui/gtk3/views/catview_gtk.py", line 439, in _update_whats_new_content docs = whats_new_cat.get_documents(self.db) File "/usr/share/software-center/softwarecenter/db/categories.py", line 124, in get_documents nonblocking_load=False) File "/usr/share/software-center/softwarecenter/db/enquire.py", line 317, in set_query self._blocking_perform_search() File "/usr/share/software-center/softwarecenter/db/enquire.py", line 212, in _blocking_perform_search matches = enquire.get_mset(0, self.limit, None, xfilter) File "/usr/share/software-center/softwarecenter/db/appfilter.py", line 89, in __call__ if (not pkgname in self.cache and File "/usr/share/software-center/softwarecenter/db/pkginfo_impl/aptcache.py", line 263, in __contains__ return self._cache.__contains__(k) AttributeError: 'NoneType' object has no attribute '__contains__'

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• HTML5Rocks Live, Episode 1

  HTML5Rocks Live, Episode 1 In this episode of HTML5Rocks Live, Boris, Eric and Paul join us to show some great new libraries and performance tips. Please leave your comments on our plus page at goo.gl In the first chapter, Paul shows how to use some of Chrome's new developer tools to understand how things are rendering and get improved performance. In the second chapter (21:25), Boris shows off his new device.js library to help make development of mobile web applications and sites easier. Eric closes the hangout (40:00) and talks about his new file system API polyfill that uses indexed db as it's back end. 02:15 Scroll Effects Demo goo.gl 23:04 - Media Queries Site goo.gl 24:15 - WURFL goo.gl 26:40 - Boris' Device Library goo.gl 29:28 - Device.js Demo goo.gl 33:25 - Bug to add touch-enabled media query to Chrome, please star goo.gl 35:00 - Chrome's DevTools for Mobile Development 38:56 - Paul Irish's Touch Demos goo.gl 40:43 - File System API Book goo.gl 43:10 - Eric's idb.filesystem.js goo.gl 44:27 - idb.filesystem HTML5 File System Demo goo.gl 47:33 - HTML5 Filesystem Playground goo.gl From: GoogleDevelopers Views: 12239 221 ratings Time: 52:29 More in Science & Technology

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• Virus that duplicates word documents as exe

  - by Bob Rivers

  Hi, We are facing a virus problem on our network, but I'm unable to identify it, so we can't properly deal with it. The symptoms are that the virus duplicates a word document (.doc) generating a new archive with the same name, but with an exe extension, and, after that, the virus hides the original file. So, when the user clicks over the file, it propagates itself. Symantec AV seems to be able to block it: every time that the virus tries to generate the exe, symantec blocks it, but at this point, the original file was already converted to hidden, so the user thinks that the file has been deleted. Symantec identifies it as a simple trojan horse. I already started a full scan, but it didn't found nothing. I'm trying to know the virus name in order to fight it. Does anyone has any kind of information? TIA, Bob

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• WinXP Movie Maker Codec Error

  - by Bob Rivers

  Hi, I'm trying to use Windows XP Movie Maker, but when I try to import an AVI video, it shows an error telling me that it wasn't import due to an the fact that the codec wasn't available (I'm able to see the video using the windows media player) First, the error message suggested to enable the option "download codecs automatically" under "tools options general". I did it. But know the error tells me that the codec wasn't available and, if I already installed it, I should reinitialize movie maker. I also already did it... The error msg is: The file D:\movie1.avi cannot be imported because the codec required to play the file is not installed on your computer. If you have already tried to download and install the codec, close and restart Windows Movie Maker, and then try to import the file again. Any hint? TIA, Bob

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• SkyDrive and Consumer Cloud Services

  - by Tim Murphy

  Paul Thurrrott recently posted an article on the future of SkyDrive and I was asked what I thought about its future by @UserCommunity.  So let’s take a look. The breakdown from Microsoft that Paul described I believe is an accurate representation of users and usages. While I can’t say that I leverage SkyDrive to the extent that it was meant to be I do enjoy having OneNote hosted their and being able to consult and edit it from the desktop, web and Windows Phone. Taking that one step further is the Midwest Geeks group which started as the community of Microsoft related user groups in our region uses SkyDrive groups and shares calendars and documents.  This collaboration aspect isn’t new in itself, but having it connected with the rest of your cloud assets makes life easier. Another recent usage of this type of cloud service is storing your personal music files in order to get that same universal access.  This is a scenario that has some arguments for and against.  On the one hand own once and listen anywhere is great, but the on the other hand the bandwidth cost becomes a giant downside.  This is especially the case since most carriers are now doing away with unlimited data packages. Ultimately I see this type of resource growing an evolving at a phenomenal rate over the next few years as we continue to become more mobile.  Having multiple players such as SkyDrive and iCloud will only help to give us more options.  Only time will tell where we end up next. del.icio.us Tags: SkyDrive,Cloud Services,Paul Thurrott,UserCommunity

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• Samba users are writing files with the same owner

  - by Alex

  I created a Samba share and 3 users (Marc, Mary and Paul), both in Ubuntu (12.04 LTS) and Samba. Then I configured 3 Win7 computers to access the share, each with different credentials. I created 3 folders, one for every user, and chown'd them to the related user, chmod'd them to 0700 and even restarted Samba. Every time that Mary or Paul create a file or a directory in the share, it ends up to be owned by Marc. They all can access the Marc folder, but none can open Mary's or Paul's. Can you help me with this problem? What am I missing?

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• Working with barcode fonts in Word

  - by Bob Rivers

  I need to create labels in Microsoft Word 2010 with numbers encoded as barcodes. The barcode's format (ean, code39, upc, etc) does not matter. I have downloaded a barcode conversion font that I found at this site. When I type the number that I want and then I format it with my new font, it produces a barcode. I then print it on an OKI laser printer (1200 dpi). The result seems to be fine, at least for common people. But, when I try to scan it, nothing happens. I tried both with a barcode scanner and a data collector, but neither of them read the barcode. My barcode scanner is working fine, because I can read commercial barcodes printed on products. Does anybody have any advice? How do I do this kind of stuff? I want to do it using Word because I will generate labels using Mail Merge. Therefore using external programs aren't option for me.

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• Mac Security - Which one?

  - by Bob Rivers

  Hi, Recently I had my credit card cloned. A few hours after shopping at an online store (in which I trust and buy since 2006) I received a call from my bank asking if I recognize a $5,000 debt to a store(?!) called Church of Christ... I'm a Mac user (OS X 10.6.3). I always kept my system updated and I have firewall enabled (in my Mac and in my broadband router), but I decided to adopt some kind of protection. I don't want to rise passionate discussions. Real or not, snake oil or not, I need to have back my peace of mind... I read this and this posts. I selected two software that I think that could help me (both have more features other than just an antivirus). Does someone have feedback about Intego's VirusBarrier X6 or Trendmicro's Smart Surfing? Intego solutions seems to be better, but TrendMicro brand/name is stronger in corporate environment, so their solution should be good. Both solutions have 30 day free trial, but I would like to hear something from you. Any other solution that I should look? TIA, Bob

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• Why do we need Hash by key? [migrated]

  - by Royi Namir

  (i'm just trying to find what am I missing...) Assuming John have a clear text message , he can create a regular hash ( like md5 , or sha256) and then encrypt the message. John can now send Paul the message + its (clear text)hash and Paul can know if the message was altered. ( decrypt and then compare hashes). Even if an attacker can change the encrpyted data ( without decrypt) - - when paul will open the message - and recalc the hash - it wont generate the same hash as the one john sent him. so why do we need hash by key ?

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• ArchBeat Link-o-Rama for 2012-10-10

  - by Bob Rhubart

  Oracle's Analytics, Engineered Systems, and Big Data Strategy | Mark Rittman Part 1 of 3 in Oracle ACE Director Mark Rittman's series on Oracle Exalytics, Oracle R Enterprise and Endeca. Series: How to Kill the Architecture Department? Part 1 | Xebia Blog Don't let the title fool you. This is not an anti-architecture post. Rather, this post, part 1 of a now four-part series, offers suggestions for preserving architecture in a form that better supports agile organizations. BPM Suite configure BAM Adapter | Peter Paul van der Beek "To have the BPM server push events to BAM – Business Activity Monitoring – we have to configure the BPM suite to use the BAM Adapter," says Peter Paul van de Beek. "The BAM Adapter is configured (like other SOA Suite and BPM Adapters) in the WebLogic Server Console." Peter Paul shows you how in this brief post. A case for not installing your own software | James Gentsch "I look selfishly forward to cloud computing and engineered systems dramatically reducing the occurrence of problems triggered by unforeseen environmental situations in the software I am responsible for," says James Gentsch. "I think this is an evolutionary game changer that will be a huge benefit to the reliability and consistent performance of the software for my customers, and may make 'well, it works here' a well forgotten phase for future software developers." Thought for the Day "I'm a strong believer in being minimalistic. Unless you actually are going to solve the general problem, don't try and put in place a framework for solving a specific one, because you don't know what that framework should look like." — Anders Hejlsberg Source: SoftwareQuotes.com`

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• WinXP Movie Maker Codec Error

  - by Bob Rivers

  I'm trying to use Windows XP Movie Maker, but when I try to import an AVI video, it shows an error telling me that it wasn't import due to an the fact that the codec wasn't available (I'm able to see the video using the windows media player) First, the error message suggested to enable the option "download codecs automatically" under "tools options general". I did it. But know the error tells me that the codec wasn't available and, if I already installed it, I should reinitialize movie maker. I also already did it... The error msg is: The file D:\movie1.avi cannot be imported because the codec required to play the file is not installed on your computer. If you have already tried to download and install the codec, close and restart Windows Movie Maker, and then try to import the file again. Any hints?

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• Procedural world generation oriented on gameplay features

  - by Richard Fabian

  In large procedural landscape games, the land seems dull, but that's probably because the real world is largely dull, with only limited places where the scenery is dramatic or tactical. Looking at world generation from this point of view, a landscape generator for a game (that is, not for the sake of scenery, but for the sake of gameplay) needs to not follow the rules of landscaping, but instead some rules married to the expectations of the gamer. For example, there could be a choke point / route generator that creates hills ravines, rivers and mountains between cities, rather than the natural way cities arise, scattered on the land based on resources or conditions generated by the mountains and rainfall patterns. Is there any existing work being done like this? Start with cities or population centres and then add in terrain afterwards? The reason I'm asking is that I'd previously pondered taking existing maps from fantasy fiction (my own and others), putting the information into the system as a base point, and then generating a good world to play in from it. This seems covered by existing technology, that is, where the designer puts in all the necessary information such as the city populations, resources, biomes, road networks and rivers, then allows the PCG fill in the gaps. But now I'm wondering if it may be possible to have a content generator generate also the overall design. Generate the cities and population centres, balancing them so that there is a natural seeming need of commerce, then generate the positions and connectivity, then from the type of city produce the list of necessary resources that must be nearby, and only then, maybe given some rules on how to make the journey between cities both believable and interesting, generate the final content including the roads, the choke points, the bridges and tunnels, ferries and the terrain including the biomes and coastline necessary. If this has been done before, I'd like to know, and would like to know what went wrong, and what went right.

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• Parse java console output with awk

  - by Bob Rivers

  Hi, I'm trying to use awk to parse an output generated by a java application, but it isn't working. It seems that the command after the pipe isn't able to get/see the data throwed by the java app. I'm executing the following command (with the return generated by the command): [root@localhost]# java -jar jmxclient.jar usr:pass host:port java.lang:type=Threading ThreadCount 06/11/2010 15:46:37 -0300 org.archive.jmx.Client ThreadCount: 103 What I need it's only the last part of the string. So I'm tryng to use awk (with pipe at the end of the line |awk -F ':' '{print $4}': [root@localhost]# java -jar jmxclient.jar usr:pass host:port java.lang:type=Threading ThreadCount|awk -F ':' '{print $4}' But the output isn't being parsed. It throws the entire string: 06/11/2010 15:46:37 -0300 org.archive.jmx.Client ThreadCount: 103 I also tryed to use |cut -f4 -d":" with the same result: the string isn't parsed. So my question is, how do I parse the output in order to get just the number at the end of the string? TIA, Bob

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• Security in Robots and Automated Systems

  - by Roger Brinkley

  Alex Dropplinger posted a Freescale blog on Securing Robotics and Automated Systems where she asks the question,“How should we secure robotics and automated systems?”.My first thought on this was duh, make sure your robot is running Java. Java's built-in services for authentication, authorization, encryption/confidentiality, and the like can be leveraged and benefit robotic or autonomous implementations. Leveraging these built-in services and pluggable encryption models of Java makes adding security to an exist bot implementation much easier. But then I thought I should ask an expert on robotics so I fired the question off to Paul Perrone of Perrone Robotics. Paul's build automated vehicles and other forms of embedded devices like auto monitoring of commercial vehicles on highways.He says that most of the works that robots do now are autonomous so it isn't a problem in the short term. But long term projects like collision avoidance technology in automobiles are going to require it.Some of the work he's doing with his Java-based MAX, set of software building blocks containing a wide range of low level and higher level software modules that developers can use to build simple to complex robot and automation applications faster and cheaper, already provide some support for JAUS compliance and because their based on Java, access to standards based security APIs.But, as Paul explained to me, "the bottom line is…it depends on the criticality level of the bot, it's network connectivity, and whether or not a standards compliance is required."

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• Rename outlook2007 categories not working

  - by Bob Rivers

  Hi, I'm new to outlook 2007 and I'm trying to rename a category. Acordingly to MS, I can achieve it by just renaming it: http://office.microsoft.com/en-us/outlook/HA012316361033.aspx But as soon as I click the OK button, confirming the change, it returns to it's original value. For instance, if I rename the "Blue Category" to "Home" it will accept without erros. But, when I click again in the Categorize icon, I'll see that the "Blue Category" is still there, and my "Home" category does not exist. Has someone experienced this kind of problem? TIA, Bob

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• Insert total number of slides in powerpoint 2007

  - by Bob Rivers

  Hi, Is it possible to insert to total amount of slides in a powerpoint footnote? I'm looking for an automated way. Of couse that I could edit the footer and put it manually, but, if I increase/decrease it, I would be necessary to adjust it. And this is something that we always forget. The help at MS explains how to do it manually. I can't believe that powerpoint doesn't have it... TIA, Bob

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• TechEd 2012: MVVM In XAML

  - by Tim Murphy

  Paul Sheriff was a real character at the start of his MVVM in XAML session.  There was a lot of sarcasm and self deprecation going on prior to the .  That is never a bad way to get things rolling right after lunch.  Then things got semi-serious. The presentation itself had a number of surprises, but not all of them had to do with XAML.  When he flipped over his company’s code generation tool it took me off guard.  I am used to generator that create code for a whole project, but his tools were able to create different types of constructs on demand.  It also made it easier to follow what he was doing than some of the other demos I have seen this week where people were using code snippets. Getting to the heart of the topic I found myself thinking that I may have found my utopia for application development in MVVM.  Yes, I know there is no such thing, but this comes closer than any other pattern I have learned about.  This pattern allows the application to have better separation of concerns than I have seen before.  This is especially true since you can leverage data binding.  I’m not sure why it has taken me so long to find time for this subject. As Paul demonstrated using this pattern with XAML gives you multi-platform reusable code when you leverage common utility classes and ModelView classes.  The one drawback I see is that you have to go to the lowest common denominator between the platforms you want to support, but you always have to weigh the trade offs. And finally, the Visual Studio nuggets just keep coming.  Even though it has been available for several generations of Visual Studio I have never seen someone use linked files within a solution.  It just goes to show that I should spend more time exploring the deeper features of each dialog. del.icio.us Tags: TechEd,TechEd 2012,MVVM,Paul Sheriff,Patterns,Visual Studio 2012

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• Securing smtp with login

  - by Paul Peelen

  I have a ispconfig server, and it seems that someone is using it to send spam. I got about 130 "Mail Delivery System" email about declined send email. This spammer uses my email address as sent from adress, so I get all these email adresses to my mail. I am using Postfix and Courier. I installed my server according to this guide: http://www.howtoforge.com/perfect-server-debian-lenny-ispconfig3-p3 I did this a few months ago. My question: Can I secure my server to require login to be able to send email, and if so... how? Thanks! EDIT Some data from mail.log, these kind of error show up constantly: Jun 15 17:58:16 bolt postfix/qmgr[10712]: CC7DA1242AE: from=<paul@*****.se>, size=3782, nrcpt=1 (queue active) Jun 15 17:58:16 bolt postfix/smtp[11337]: CC7DA1242AE: to=<[email protected]>, relay=none, delay=4641, delays=4640/0.01/0.32/0, dsn=4.4.3, status=deferred (Host or domain name not found. Name service error for name=cmlisboa.pt type=MX: Host not found, try again) Jun 15 17:58:19 bolt postfix/smtpd[10836]: connect from static-200-105-220-154.acelerate.net[200.105.220.154] Jun 15 17:58:20 bolt postfix/smtpd[10836]: NOQUEUE: reject: RCPT from static-200-105-220-154.acelerate.net[200.105.220.154]: 550 5.1.1 <advertising@*****.com>: Recipient address rejected: User unknown in virtual mailbox table; from=<[email protected]> to=<advertising@*****.com> proto=ESMTP helo=<static-200-105-220-154.acelerate.net> Jun 15 17:58:20 bolt postfix/smtpd[10836]: lost connection after DATA (0 bytes) from static-200-105-220-154.acelerate.net[200.105.220.154] Jun 15 17:58:20 bolt postfix/smtpd[10836]: disconnect from static-200-105-220-154.acelerate.net[200.105.220.154] Jun 15 17:58:29 bolt postfix/smtpd[10834]: connect from unknown[62.176.172.226] Jun 15 17:58:32 bolt postfix/smtpd[10834]: 386791241F9: client=unknown[62.176.172.226] Jun 15 17:58:34 bolt postfix/cleanup[10975]: 386791241F9: message-id=<[email protected]> Jun 15 17:58:34 bolt postfix/qmgr[10712]: 386791241F9: from=<[email protected]>, size=867, nrcpt=1 (queue active) Jun 15 17:58:35 bolt postfix/smtpd[10834]: disconnect from unknown[62.176.172.226] Jun 15 17:58:35 bolt amavis[11084]: (11084-17) Blocked SPAM, [62.176.172.226] [62.176.172.226] <[email protected]> -> <*****@*****>, Message-ID: <[email protected]>, mail_id: XczovKoMBYNr, Hits: 18.471, size: 867, 833 ms Jun 15 17:58:35 bolt postfix/smtp[10732]: 386791241F9: to=<*****@*****>, relay=127.0.0.1[127.0.0.1]:10024, delay=3.5, delays=2.7/0/0/0.83, dsn=2.7.0, status=sent (250 2.7.0 Ok, discarded, id=11084-17 - SPAM) Jun 15 17:58:35 bolt postfix/qmgr[10712]: 386791241F9: removed Jun 15 17:58:43 bolt postfix/smtpd[10836]: warning: 178.121.154.194: address not listed for hostname mm-194-154-121-178.dynamic.pppoe.mgts.by Jun 15 17:58:43 bolt postfix/smtpd[10836]: connect from unknown[178.121.154.194] Jun 15 17:58:45 bolt postfix/smtpd[10727]: connect from unknown[180.134.223.86] EDIT #2 Got some more info from the logs, this is a send request: mail.info.1:Jun 15 16:41:57 bolt amavis[5399]: (05399-06) Passed CLEAN, [110.139.48.64] [110.139.48.64] <paul@*****.se> -> <[email protected]>, Message-ID: <CHILKAT-MID-7c54ebcf-5501-de9b-f0b1-4f0234290d8d@HP-IRISH>, mail_id: 35l56Ramx6Nc, Hits: -2.941, size: 3329, queued_as: 2485770086, 136 ms mail.info.1:Jun 15 16:41:57 bolt postfix/smtp[4743]: 375C570082: to=<[email protected]>, relay=127.0.0.1[127.0.0.1]:10024, delay=4.8, delays=4.7/0/0/0.14, dsn=2.0.0, status=sent (250 2.0.0 Ok, id=05399-06, from MTA([127.0.0.1]:10025): 250 2.0.0 Ok: queued as 2485770086) Which apparently got thrue. Any ideas how to restrict this?

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• Cardinality Estimation Bug with Lookups in SQL Server 2008 onward

  - by Paul White

  Cost-based optimization stands or falls on the quality of cardinality estimates (expected row counts).  If the optimizer has incorrect information to start with, it is quite unlikely to produce good quality execution plans except by chance.  There are many ways we can provide good starting information to the optimizer, and even more ways for cardinality estimation to go wrong.  Good database people know this, and work hard to write optimizer-friendly queries with a schema and metadata (e.g. statistics) that reduce the chances of poor cardinality estimation producing a sub-optimal plan.  Today, I am going to look at a case where poor cardinality estimation is Microsoft’s fault, and not yours. SQL Server 2005 SELECT th.ProductID, th.TransactionID, th.TransactionDate FROM Production.TransactionHistory AS th WHERE th.ProductID = 1 AND th.TransactionDate BETWEEN '20030901' AND '20031231'; The query plan on SQL Server 2005 is as follows (if you are using a more recent version of AdventureWorks, you will need to change the year on the date range from 2003 to 2007): There is an Index Seek on ProductID = 1, followed by a Key Lookup to find the Transaction Date for each row, and finally a Filter to restrict the results to only those rows where Transaction Date falls in the range specified.  The cardinality estimate of 45 rows at the Index Seek is exactly correct.  The table is not very large, there are up-to-date statistics associated with the index, so this is as expected. The estimate for the Key Lookup is also exactly right.  Each lookup into the Clustered Index to find the Transaction Date is guaranteed to return exactly one row.  The plan shows that the Key Lookup is expected to be executed 45 times.  The estimate for the Inner Join output is also correct – 45 rows from the seek joining to one row each time, gives 45 rows as output. The Filter estimate is also very good: the optimizer estimates 16.9951 rows will match the specified range of transaction dates.  Eleven rows are produced by this query, but that small difference is quite normal and certainly nothing to worry about here.  All good so far. SQL Server 2008 onward The same query executed against an identical copy of AdventureWorks on SQL Server 2008 produces a different execution plan: The optimizer has pushed the Filter conditions seen in the 2005 plan down to the Key Lookup.  This is a good optimization – it makes sense to filter rows out as early as possible.  Unfortunately, it has made a bit of a mess of the cardinality estimates. The post-Filter estimate of 16.9951 rows seen in the 2005 plan has moved with the predicate on Transaction Date.  Instead of estimating one row, the plan now suggests that 16.9951 rows will be produced by each clustered index lookup – clearly not right!  This misinformation also confuses SQL Sentry Plan Explorer: Plan Explorer shows 765 rows expected from the Key Lookup (it multiplies a rounded estimate of 17 rows by 45 expected executions to give 765 rows total). Workarounds One workaround is to provide a covering non-clustered index (avoiding the lookup avoids the problem of course): CREATE INDEX nc1 ON Production.TransactionHistory (ProductID) INCLUDE (TransactionDate); With the Transaction Date filter applied as a residual predicate in the same operator as the seek, the estimate is again as expected: We could also force the use of the ultimate covering index (the clustered one): SELECT th.ProductID, th.TransactionID, th.TransactionDate FROM Production.TransactionHistory AS th WITH (INDEX(1)) WHERE th.ProductID = 1 AND th.TransactionDate BETWEEN '20030901' AND '20031231'; Summary Providing a covering non-clustered index for all possible queries is not always practical, and scanning the clustered index will rarely be optimal.  Nevertheless, these are the best workarounds we have today. In the meantime, watch out for poor cardinality estimates when a predicate is applied as part of a lookup. The worst thing is that the estimate after the lookup join in the 2008+ plans is wrong.  It’s not hopelessly wrong in this particular case (45 versus 16.9951 is not the end of the world) but it easily can be much worse, and there’s not much you can do about it.  Any decisions made by the optimizer after such a lookup could be based on very wrong information – which can only be bad news. If you think this situation should be improved, please vote for this Connect item. © 2012 Paul White – All Rights Reserved twitter: @SQL_Kiwi email: [email protected]

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• BIOS flash XP, 1 long beep, 2 short beeps, over&over

  - by Paul

  BIOS issue on HP dv9233cl laptop, wiped drive of Vista, loaded XP, not all the drives loaded. Went to the HP website, downloaded all drivers for this laptop. Started loading them. Loaded WIN Flash HP Network System BIOS Window SP42187. After a minute a low resolution screen appeared stating "It is now safe to turn off the computer" I waited a minute and half. Turned it off. Let it set 10 seconds try to start and No screen images at all and a nasty loud long beep 2 short beeps, 2 seconds of silence and it happens over & over again. I have unplugged/removed battery, still same problem, Any sugg.... Thx.. Paul

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• LTO 3 tape drive needing repaired

  - by DO it all Paul

  We have an IBM LTO 3 tape drive that needs repaired and with the £400 price tag i'm having to shop around for quotes. My question is has anyone actually repaired one before and how was in done? The first error LED was showing a 6, then i cleared the mangled tape only for it to start flashing alternate 'o' on the 7 segment display, simliar to a half 8, flashing top to bottom and it would just flash away like that coupled with a flashing amber light. I tried a reset holding the eject button for it to show an 'r' the go back to flashing again as before. I checked the IBM solutions for the codes but this flashing isn't documented at all. Would be great if anyone had any experience in this area. Thank you, Paul

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• HTTP downloads slow - FTP of same file very fast - Windows 2003

  - by Paul Hinett

  I am having some issues with download speeds on my site via http, i am averaging around 70kbps downloading a file that is around 70mb. But if i connect to my server via FTP and download the same file on the same computer / connection i am averaging about 300+kbps. I know my server has alot of connections at any one time, probably around 400 connections. My server has a 1gbps connection to the internet so there is plenty of bandwidth available, as proven with the FTP. I have no throttling of any kind enabled in IIS. If interested there is a test file here you can download to check the speed: http://filesd.house-mixes.com/test.zip I am based in the UK and the server is in Washington, USA if that makes any difference. Paul

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