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  • Symbolic links not working in MySQL

    - by Eno
    I'm having an issue, I searched a lot but I'm not sure if it's related to a previous security patch. On the last version of MySQL on Debian Lenny ( 5.0.51a-24 ) I need to share one table between two db, those two db are in the same path ( /var/lib/mysql/db1 & db2 ). I created symbolic links for db2 pointing to the table in db1. When I query the same table from db2 I get this : 'ERROR 1030 (HY000): Got error 140 from storage engine' This is how it looks : test-lan:/var/lib/mysql/test3# ls -alh drwx------ 2 mysql mysql 4.0K 2010-08-30 13:28 . drwxr-xr-x 6 mysql mysql 4.0K 2010-08-30 13:29 .. lrwxrwxrwx 1 mysql mysql 28 2010-08-30 13:28 blbl.frm -> /var/lib/mysql/test/blbl.frm lrwxrwxrwx 1 mysql mysql 28 2010-08-30 13:28 blbl.MYD -> /var/lib/mysql/test/blbl.MYD lrwxrwxrwx 1 mysql mysql 28 2010-08-30 13:28 blbl.MYI -> /var/lib/mysql/test/blbl.MYI -rw-rw---- 1 mysql mysql 65 2010-08-30 13:24 db.opt I really need those symlinks, is there a way to make them working like before ? ( old MySQL-server is fine ) Thanks,

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  • PeopleSoft at Alliance 2012 Executive Forum

    - by John Webb
    Guest Posting From Rebekah Jackson This week I jointed over 4,800 Higher Ed and Public Sector customers and partners in Nashville at our annual Alliance conference.   I got lost easily in the hallways of the sprawling Gaylord Opryland Hotel. I carried the resort map with me, and I would still stand for several minutes at a very confusing junction, studying the map and the signage on the walls. Hallways led off in many directions, some with elevators going down here and stairs going up there. When I took a wrong turn I would instantly feel stuck, lose my bearings, and occasionally even have to send out a call for help.    It strikes me that the theme for the Executive Forum this year outlines a less tangible but equally disorienting set of challenges that our higher education customer’s CIOs are facing: Making Decisions at the Intersection of Business Value, Strategic Investment, and Enterprise Technology. The forces acting upon higher education institutions today are not neat, straight-forward decision points, where one can glance to the right, glance to the left, and then quickly choose the best course of action. The operational, technological, and strategic factors that must be considered are complex, interrelated, messy…and the stakes are high. Michael Horn, co-author of “Disrupting Class: How Disruptive Innovation Will Change the Way the World Learns”, set the tone for the day. He introduced the model of disruptive innovation, which grew out of the research he and his colleagues have done on ‘Why Successful Organizations Fail’. Highly simplified, the pattern he shared is that things start out decentralized, take a leap to extreme centralization, and then experience progressive decentralization. Using computers as an example, we started with a slide rule, then developed the computer which centralized in the form of mainframes, and gradually decentralized to mini-computers, desktop computers, laptops, and now mobile devices. According to Michael, you have more computing power in your cell phone than existed on the planet 60 years ago, or was on the first rocket that went to the moon. Applying this pattern to Higher Education means the introduction of expensive and prestigious private universities, followed by the advent of state schools, then by community colleges, and now online education. Michael shared statistics that indicate 50% of students will be taking at least one on line course by 2014…and by some measures, that’s already the case today. The implication is that technology moves from being the backbone of the campus, the IT department’s domain, and pushes into the academic core of the institution. Innovative programs are underway at many schools like Bellevue and BYU Idaho, joined by startups and disruptive new players like the Khan Academy.   This presents both threat and opportunity for higher education institutions, and means that IT decisions cannot afford to be disconnected from the institution’s strategic plan. Subsequent sessions explored this theme.    Theo Bosnak, from Attain, discussed the model they use for assessing the complete picture of an institution’s financial health. Compounding the issue are the dramatic trends occurring in technology and the vendors that provide it. Ovum analyst Nicole Engelbert, shared her insights next and suggested that incremental changes are no longer an option, instead fundamental changes are affecting the landscape of enterprise technology in higher ed.    Nicole closed with her recommendation that institutions focus on the trends in higher education with an eye towards the strategic requirements and business value first. Technology then is the enabler.   The last presentation of the day was from Tom Fisher, Sr. Vice President of Cloud Services at Oracle. Tom runs the delivery arm of the Cloud Services group, and shared his thoughts candidly about his experiences with cloud deployments as well as key issues around managing costs and security in cloud deployments. Okay, we’ve covered a lot of ground at this point, from financials planning, business strategy, and cloud computing, with the possibility that half of the institutions in the US might not be around in their current form 10 years from now. Did I forget to mention that was raised in the morning session? Seems a little hard to believe, and yet Michael Horn made a compelling point. Apparently 100 years ago, 8 of the top 10 education institutions in the world were German. Today, the leading German school is ranked somewhere in the 40’s or 50’s. What will the landscape be 100 years from now? Will there be an institution from China, India, or Brazil in the top 10? As Nicole suggested, maybe US parents will be sending their children to schools overseas much sooner, faced with the ever-increasing costs of a US based education. Will corporations begin to view skill-based certification from an online provider as a viable alternative to a 4 year degree from an accredited institution, fundamentally altering the education industry as we know it?

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  • PASS Summit 2011 &ndash; Part III

    - by Tara Kizer
    Well we’re about a month past PASS Summit 2011, and yet I haven’t finished blogging my notes! Between work and home life, I haven’t been able to come up for air in a bit.  Now on to my notes… On Thursday of the PASS Summit 2011, I attended Klaus Aschenbrenner’s (blog|twitter) “Advanced SQL Server 2008 Troubleshooting”, Joe Webb’s (blog|twitter) “SQL Server Locking & Blocking Made Simple”, Kalen Delaney’s (blog|twitter) “What Happened? Exploring the Plan Cache”, and Paul Randal’s (blog|twitter) “More DBA Mythbusters”.  I think my head grew two times in size from the Thursday sessions.  Just WOW! I took a ton of notes in Klaus' session.  He took a deep dive into how to troubleshoot performance problems.  Here is how he goes about solving a performance problem: Start by checking the wait stats DMV System health Memory issues I/O issues I normally start with blocking and then hit the wait stats.  Here’s the wait stat query (Paul Randal’s) that I use when working on a performance problem.  He highlighted a few waits to be aware of such as WRITELOG (indicates IO subsystem problem), SOS_SCHEDULER_YIELD (indicates CPU problem), and PAGEIOLATCH_XX (indicates an IO subsystem problem or a buffer pool problem).  Regarding memory issues, Klaus recommended that as a bare minimum, one should set the “max server memory (MB)” in sp_configure to 2GB or 10% reserved for the OS (whichever comes first).  This is just a starting point though! Regarding I/O issues, Klaus talked about disk partition alignment, which can improve SQL I/O performance by up to 100%.  You should use 64kb for NTFS cluster, and it’s automatic in Windows 2008 R2. Joe’s locking and blocking presentation was a good session to really clear up the fog in my mind about locking.  One takeaway that I had no idea could be done was that you can set a timeout in T-SQL code view LOCK_TIMEOUT.  If you do this via the application, you should trap error 1222. Kalen’s session went into execution plans.  The minimum size of a plan is 24k.  This adds up fast especially if you have a lot of plans that don’t get reused much.  You can use sys.dm_exec_cached_plans to check how often a plan is being reused by checking the usecounts column.  She said that we can use DBCC FLUSHPROCINDB to clear out the stored procedure cache for a specific database.  I didn’t know we had this available, so this was great to hear.  This will be less intrusive when an emergency comes up where I’ve needed to run DBCC FREEPROCCACHE. Kalen said one should enable “optimize for ad hoc workloads” if you have an adhoc loc.  This stores only a 300-byte stub of the first plan, and if it gets run again, it’ll store the whole thing.  This helps with plan cache bloat.  I have a lot of systems that use prepared statements, and Kalen says we simulate those calls by using sp_executesql.  Cool! Paul did a series of posts last year to debunk various myths and misconceptions around SQL Server.  He continues to debunk things via “DBA Mythbusters”.  You can get a PDF of a bunch of these here.  One of the myths he went over is the number of tempdb data files that you should have.  Back in 2000, the recommendation was to have as many tempdb data files as there are CPU cores on your server.  This no longer holds true due to the numerous cores we have on our servers.  Paul says you should start out with 1/4 to 1/2 the number of cores and work your way up from there.  BUT!  Paul likes what Bob Ward (twitter) says on this topic: 8 or less cores –> set number of files equal to the number of cores Greater than 8 cores –> start with 8 files and increase in blocks of 4 One common myth out there is to set your MAXDOP to 1 for an OLTP workload with high CXPACKET waits.  Instead of that, dig deeper first.  Look for missing indexes, out-of-date statistics, increase the “cost threshold for parallelism” setting, and perhaps set MAXDOP at the query level.  Paul stressed that you should not plan a backup strategy but instead plan a restore strategy.  What are your recoverability requirements?  Once you know that, now plan out your backups. As Paul always does, he talked about DBCC CHECKDB.  He said how fabulous it is.  I didn’t want to interrupt the presentation, so after his session had ended, I asked Paul about the need to run DBCC CHECKDB on your mirror systems.  You could have data corruption occur at the mirror and not at the principal server.  If you aren’t checking for data corruption on your mirror systems, you could be failing over to a corrupt database in the case of a disaster or even a planned failover.  You can’t run DBCC CHECKDB against the mirrored database, but you can run it against a snapshot off the mirrored database.

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  • Abysmal transfer speeds on gigabit network

    - by Vegard Larsen
    I am having trouble getting my Gigabit network to work properly between my desktop computer and my Windows Home Server. When copying files to my server (connected through my switch), I am seeing file transfer speeds of below 10MB/s, sometimes even below 1MB/s. The machine configurations are: Desktop Intel Core 2 Quad Q6600 Windows 7 Ultimate x64 2x WD Green 1TB drives in striped RAID 4GB RAM AB9 QuadGT motherboard Realtek RTL8810SC network adapter Windows Home Server AMD Athlon 64 X2 4GB RAM 6x WD Green 1,5TB drives in storage pool Gigabyte GA-MA78GM-S2H motherboard Realtek 8111C network adapter Switch dLink Green DGS-1008D 8-port Both machines report being connected at 1Gbps. The switch lights up with green lights for those two ports, indicating 1Gbps. When connecting the machines through the switch, I am seeing insanely low speeds from WHS to the desktop measured with iperf: 10Kbits/sec (WHS is running iperf -c, desktop is iperf -s). Using iperf the other way (WHS is iperf -s, desktop iperf -c) speeds are also bad (~20Mbits/sec). Connecting the machines directly with a patch cable, I see much higher speeds when connecting from desktop to WHS (~300 Mbits/sec), but still around 10Kbits/sec when connecting from WHS to the desktop. File transfer speeds are also much quicker (both directions). Log from desktop for iperf connection from WHS (through switch): C:\temp>iperf -s ------------------------------------------------------------ Server listening on TCP port 5001 TCP window size: 8.00 KByte (default) ------------------------------------------------------------ [248] local 192.168.1.32 port 5001 connected with 192.168.1.20 port 3227 [ ID] Interval Transfer Bandwidth [248] 0.0-18.5 sec 24.0 KBytes 10.6 Kbits/sec Log from desktop for iperf connection to WHS (through switch): C:\temp>iperf -c 192.168.1.20 ------------------------------------------------------------ Client connecting to 192.168.1.20, TCP port 5001 TCP window size: 8.00 KByte (default) ------------------------------------------------------------ [148] local 192.168.1.32 port 57012 connected with 192.168.1.20 port 5001 [ ID] Interval Transfer Bandwidth [148] 0.0-10.3 sec 28.5 MBytes 23.3 Mbits/sec What is going on here? Unfortunately I don't have any other gigabit-capable devices to try with.

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  • JVM system time runs faster than HP UNIX OS system time

    - by winston
    Hello I have the following output from a simple debug jsp: Weblogic Startup Since: Friday, October 19, 2012, 08:36:12 AM Database Current Time: Wednesday, December 12, 2012, 11:43:44 AM Weblogic JVM Current Time: Wednesday, December 12, 2012, 11:45:38 AM Line 1 was a recorded variable during WebLogic webapp startup. Line 2 was output from database query select sysdate from dual; Line 3 was output from java code new Date() I have checked from shell date command that line 2 output conforms with OS time. The output of line 3 was mysterious. I don't know how it comes from Java VM. On another machine with same setting, the same jsp output like this: Weblogic Startup Since: Tuesday, December 11, 2012, 02:29:06 PM Database Current Time: Wednesday, December 12, 2012, 11:51:48 AM Weblogic JVM Current Time: Wednesday, December 12, 2012, 11:51:50 AM Another machine: Weblogic Startup Since: Monday, December 10, 2012, 05:00:34 PM Database Current Time: Wednesday, December 12, 2012, 11:52:03 AM Weblogic JVM Current Time: Wednesday, December 12, 2012, 11:52:07 AM Findings: the pattern shows that the longer Weblogic startup, the larger the discrepancy of OS time with JVM time. Anybody could help on HP JVM? On HP UNIX, NTP was done daily. Anyway here comes the server versions: HP-UX machinex B.11.31 U ia64 2426956366 unlimited-user license java version "1.6.0.04" Java(TM) SE Runtime Environment (build 1.6.0.04-jinteg_28_apr_2009_04_46-b00) Java HotSpot(TM) Server VM (build 11.3-b02-jre1.6.0.04-rc2, mixed mode) WebLogic Server Version: 10.3.2.0 Java properties java.runtime.name=Java(TM) SE Runtime Environment java.runtime.version=1.6.0.04-jinteg_28_apr_2009_04_46-b00 java.vendor=Hewlett-Packard Co. java.vendor.url=http\://www.hp.com/go/Java java.version=1.6.0.04 java.vm.name=Java HotSpot(TM) 64-Bit Server VM java.vm.info=mixed mode java.vm.specification.vendor=Sun Microsystems Inc. java.vm.vendor="Hewlett-Packard Company" sun.arch.data.model=64 sun.cpu.endian=big sun.cpu.isalist=ia64r0 sun.io.unicode.encoding=UnicodeBig sun.java.launcher=SUN_STANDARD sun.jnu.encoding=8859_1 sun.management.compiler=HotSpot 64-Bit Server Compiler sun.os.patch.level=unknown os.name=HP-UX os.version=B.11.31

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  • How to fix Apache from crashing with PHP+Curl on an SSH request?

    - by Jason Cohen
    My Apache process segfaults whenever I call curl_exec() from PHP with an "https://" URL. If I use http instead of https as the URL transport, it works perfectly, so I know curl and the other curl options are correct. I can use curl from the command-line on that server using the https version of the URL and it works perfectly, so I know the remote server is responding correctly, the cert isn't expired, etc.. My server is: Linux 2.6.32-21-server #32-Ubuntu SMP Fri Apr 16 09:17:34 UTC 2010 x86_64 GNU/Linux My Apache version is: Server version: Apache/2.2.14 (Ubuntu) Server built: Apr 13 2010 20:21:26 My PHP version is: PHP 5.3.2-1ubuntu4.2 with Suhosin-Patch (cli) (built: May 13 2010 20:03:45) Zend Engine v2.3.0, Copyright (c) 1998-2010 Zend Technologies My PHP curl module info is: cURL support => enabled cURL Information => 7.19.7 Age => 3 Features AsynchDNS => No Debug => No GSS-Negotiate => Yes IDN => Yes IPv6 => Yes Largefile => Yes NTLM => Yes SPNEGO => No SSL => Yes SSPI => No krb4 => No libz => Yes CharConv => No Protocols => tftp, ftp, telnet, dict, ldap, ldaps, http, file, https, ftps Host => x86_64-pc-linux-gnu SSL Version => OpenSSL/0.9.8k ZLib Version => 1.2.3.3

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  • Understanding Exchange User Monitor (ExMon) Output

    - by SturdyErde
    I recently downloaded and ran ExMon while trying to troubleshoot Outlook connectivity problems due to high CPU usage on Exchange Server 2010 SP2 UR8. The tool provides a great set of data, but I have not yet figured out how to make great use of it. My first question is why the Exchange Server itself shows up as a high-use MAPI client in the ExMon data. Among the users' client versions I see build numbers listed for Outlook 2013, 2010, and yes, even 2007 clients. I also see build number 14.2.387.0, which represents Exchange Server 2010 SP2 Update Rollup 8 (+/- some other patch that makes it not quite match the UR8 number). There are many user rows that list only "::1" and/or the short hostname of my Exchange server in the 'Client IP Addresses' column. Some other columns include the end-user's actual IP address and the Exchange server's IP address. ExMon shows that it is actually Exchange Server that is utilizing the highest percentage of CPU that is used for MAPI calls. I had expected to see 1 IP address and version number for each user reported by ExMon. Instead, most records show multiple version #'s (Exchange ver and Outlook ver) and multiple IPs (Exchange IP and client IP). Can anyone explain the reason for this to me, please?

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  • IIS6 Virtual SMTP server isn't coming back up automatically after a system restart

    - by Julian James
    I've got a virtual server running Win2008 RC2. I've set up IIS6 with a virtual SMTP server on it to be the mail provider for the websites I'm hosting there. It all works great, but if for some reason the server reboots (auto updates are still enabled - I'm trying to make this as little work as possible as we've got a Lot of clients), the IIS6 doesn't restart the SMTP server. The failure causes 500 errors on the current setup, so I'm spending half the day apologising. Any ideas? In Services I've set everything to come back up automatically, but still no dice. As soon as I restart the SMTP, no problems, all the mail gets sent. It's working perfectly, it just won't restart on it's own. I'd really rather not turn auto updates off as we're such a small company I just can't spare the time to be manually updating 15 copies of windows every time MS decide there's a security patch. All advice appreciated! BTW, I am a complete newb to these forums. I searched but couldn't find an answer, so please be nice. But firm. I've got to learn here.

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  • Setup 2003 R2 Radius server to work on vista/seven

    - by Fox
    Hi All, I'm currently trying to configure my 2003 R2 server RADIUS module to enable WIFI client to authenticate throught my Active Directory. The RADIUS server use MS-CHAP V2 as encryption method. I got several Access Point running DD-WRT, configured to use WPA2-Enterprise security that use Radius Server. Everything is setup, and almost working. When I say almost working, I mean, I can login using my AD Credential on my IPod or even on a MacBook running OS X, Windows XP also work with some little tweak in connection properties. The problem is Windows Vista or Windows Seven clients computers that are not inside domain. It doesn't work at all, it doesn't even prompt for user/password/domain. I already install the patch for IAS to make the certsrv compatible with Vista and Seven, but still doesn't work. Anyone ever encounter the same issue I have right now? I'm searching for a solution to this for several already and still not find anything. Looks like many people have the same issue too. Thanks all for you eventual answers.

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  • Enabling CURL on Ubuntu 11.10

    - by Afsheen Khosravian
    I have installed curl: sudo apt-get install curl libcurl3 libcurl3-dev php5-curl and I have updated my php.ini file to include(I also tried .so): extension=php_curl.dll To test if curl is working I created a file called testCurl.php which contains the following: <?php echo ‘<pre>’; var_dump(curl_version()); echo ‘</pre>’; ?> When I navigate to localhost/testCurl.php I get an error: HTTP Error 500 Heres a snippet from the error log: PHP Warning: PHP Startup: Unable to load dynamic library '/usr/lib/php5/20090626+lfs/php_curl.dll' - /usr/lib/php5/20090626+lfs/php_curl.dll: cannot op$ PHP Warning: PHP Startup: Unable to load dynamic library '/usr/lib/php5/20090626+lfs/sqlite.so' - /usr/lib/php5/20090626+lfs/sqlite.so: cannot open sha$ [Sun Dec 25 12:10:17 2011] [notice] Apache/2.2.20 (Ubuntu) PHP/5.3.6-13ubuntu3.3 with Suhosin-Patch configured -- resuming normal operations [Sun Dec 25 12:13:46 2011] [error] [client 127.0.0.1] File does not exist: /var/www/css, referer: http://localhost/ [Sun Dec 25 12:13:46 2011] [error] [client 127.0.0.1] File does not exist: /var/www/css, referer: http://localhost/ [Sun Dec 25 12:13:46 2011] [error] [client 127.0.0.1] File does not exist: /var/www/css, referer: http://localhost/ [Sun Dec 25 12:13:46 2011] [error] [client 127.0.0.1] File does not exist: /var/www/css, referer: http://localhost/` Can anyone help me to get curl working? The problem was with the original test code. I used a new test file containing this and curl is now working: <?php ## Test if cURL is working ## ## SCRIPT BY WWW.WEBUNE.COM (please do not remove)## echo '<pre>'; var_dump(curl_version()); echo '</pre>'; ?>

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  • Can Vista Windows Explorer be repaired/fixed?

    - by gurun8
    I'm running Windows Vista Home Premium on a Sony Vaio laptop. I think somehow my Windows Explorer has become corrupted. I don't recall any certain inciting incident like installing an unreputable 3rd party app or hardware failure but just recently my system won't wake after it's been left idle longer that 20 minutes and goes to sleep. I've also had problems launch certain apps, like Adobe InDesign CS3, that just basically freeze the system but leave mouse movements functioning for a short time before freezing the entire system which requires a hard reboot to resolve the freeze. The system seems to run normally when used but I fear there's a looming possibility that this is a house of cards and will all come crashing down soon. My question is this, can Windows Explorer be repaired/fixed? Before reformatting the system and starting over, which is most likely what I'm going to be forced to do, I'd like explore (no pun intended) my options in fixing the problem with a patch or reinstall or something of that nature. Reformatting my system will eat up a day or two of my time and I just don't have the time to spare right now.

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  • A deadlock was detected while trying to lock variables in SSIS

    Error: 0xC001405C at SQL Log Status: A deadlock was detected while trying to lock variables "User::RowCount" for read/write access. A lock cannot be acquired after 16 attempts. The locks timed out. Have you ever considered variable locking when building your SSIS packages? I expect many people haven’t just because most of the time you never see an error like the one above. I’ll try and explain a few key concepts about variable locking and hopefully you never will see that error. First of all, what is all this variable locking all about? Put simply SSIS variables have to be locked before they can be accessed, and then of course unlocked once you have finished with them. This is baked into SSIS, presumably to reduce the risk of race conditions, but with that comes some additional overhead in that you need to be careful to avoid lock conflicts in some scenarios. The most obvious place you will come across any hint of locking (no pun intended) is the Script Task or Script Component with their ReadOnlyVariables and ReadWriteVariables properties. These two properties allow you to enter lists of variables to be used within the task, or to put it another way, these lists of variables to be locked, so that they are available within the task. During the task pre-execute phase the variables and locked, you then use them during the execute phase when you code is run, and then unlocked for you during the post-execute phase. So by entering the variable names in one of the two list, the locking is taken care of for you, and you just read and write to the Dts.Variables collection that is exposed in the task for the purpose. As you can see in the image above, the variable PackageInt is specified, which means when I write the code inside that task I don’t have to worry about locking at all, as shown below. public void Main() { // Set the variable value to something new Dts.Variables["PackageInt"].Value = 199; // Raise an event so we can play in the event handler bool fireAgain = true; Dts.Events.FireInformation(0, "Script Task Code", "This is the script task raising an event.", null, 0, ref fireAgain); Dts.TaskResult = (int)ScriptResults.Success; } As you can see as well as accessing the variable, hassle free, I also raise an event. Now consider a scenario where I have an event hander as well as shown below. Now what if my event handler uses tries to use the same variable as well? Well obviously for the point of this post, it fails with the error quoted previously. The reason why is clearly illustrated if you consider the following sequence of events. Package execution starts Script Task in Control Flow starts Script Task in Control Flow locks the PackageInt variable as specified in the ReadWriteVariables property Script Task in Control Flow executes script, and the On Information event is raised The On Information event handler starts Script Task in On Information event handler starts Script Task in On Information event handler attempts to lock the PackageInt variable (for either read or write it doesn’t matter), but will fail because the variable is already locked. The problem is caused by the event handler task trying to use a variable that is already locked by the task in Control Flow. Events are always raised synchronously, therefore the task in Control Flow that is raising the event will not regain control until the event handler has completed, so we really do have un-resolvable locking conflict, better known as a deadlock. In this scenario we can easily resolve the problem by managing the variable locking explicitly in code, so no need to specify anything for the ReadOnlyVariables and ReadWriteVariables properties. public void Main() { // Set the variable value to something new, with explicit lock control Variables lockedVariables = null; Dts.VariableDispenser.LockOneForWrite("PackageInt", ref lockedVariables); lockedVariables["PackageInt"].Value = 199; lockedVariables.Unlock(); // Raise an event so we can play in the event handler bool fireAgain = true; Dts.Events.FireInformation(0, "Script Task Code", "This is the script task raising an event.", null, 0, ref fireAgain); Dts.TaskResult = (int)ScriptResults.Success; } Now the package will execute successfully because the variable lock has already been released by the time the event is raised, so no conflict occurs. For those of you with a SQL Engine background this should all sound strangely familiar, and boils down to getting in and out as fast as you can to reduce the risk of lock contention, be that SQL pages or SSIS variables. Unfortunately we cannot always manage the locking ourselves. The Execute SQL Task is very often used in conjunction with variables, either to pass in parameter values or get results out. Either way the task will manage the locking for you, and will fail when it cannot lock the variables it requires. The scenario outlined above is clear cut deadlock scenario, both parties are waiting on each other, so it is un-resolvable. The mechanism used within SSIS isn’t actually that clever, and whilst the message says it is a deadlock, it really just means it tried a few times, and then gave up. The last part of the error message is actually the most accurate in terms of the failure, A lock cannot be acquired after 16 attempts. The locks timed out.  Now this may come across as a recommendation to always manage locking manually in the Script Task or Script Component yourself, but I think that would be an overreaction. It is more of a reminder to be aware that in high concurrency scenarios, especially when sharing variables across multiple objects, locking is important design consideration. Update – Make sure you don’t try and use explicit locking as well as leaving the variable names in the ReadOnlyVariables and ReadWriteVariables lock lists otherwise you’ll get the deadlock error, you cannot lock a variable twice!

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  • Caveat utilitor - Can I run two versions of Microsoft Project side-by-side?

    - by Martin Hinshelwood
    A number of out customers have asked if there are any problems in installing and running multiple versions of Microsoft Project on a single client. Although this is a case of Caveat utilitor (Let the user beware), as long as the user understands and accepts the issues that can occur then they can do this. Although Microsoft provide the ability to leave old versions of Office products (except Outlook) on your client when you are installing a new version of the product they certainly do not endorse doing so. Figure: For Project you can choose to keep the old stuff   That being the case I would have preferred that they put a “(NOT RECOMMENDED)” after the options to impart that knowledge to the rest of us, but they did not. The default and recommended behaviour is for the newer version installer to remove the older versions. Of course this does not apply in the revers. There are no forward compatibility packs for Office. There are a number of negative behaviours (or bugs) that can occur in this configuration: There is only one MS Project In Windows a file extension can only be associated with a single program.  In this case, MPP files can be associated with only one version of winproj.exe.  The executables are in different folders so if a user double-clicks a Project file on the desktop, file explorer, or Outlook email, Windows will launch the winproj.exe associated with MPP and then load the MPP file.  There are problems associated with this situation and in some cases workarounds. The user double-clicks on a Project 2010 file, Project 2007 launches but is unable to open the file because it is a newer version.  The workaround is for the user to launch Project 2010 from the Start menu then open the file.  If the file is attached to an email they will need to first drag the file to the desktop. All your linked MS Project files need to be of the same version There are a number of problems that occur when people use on Microsoft’s Object Linking and Embedding (OLE) technology.  The three common uses of OLE are: for inserted projects where a Master project contains sub-projects and each sub-project resides in its own MPP file shared resource pools where multiple MPP files share a common resource pool kept in a single MPP file cross-project links where a task or milestone in one MPP file has a  predecessor/successor relationship with a task or milestone in a different MPP file What I’ve seen happen before is that if you are running in a version of Project that is not associated with the MPP extension and then try and activate an OLE link then Project tries to launch the other version of Project.  Things start getting very confused since different MPP files are being controlled by different versions of Project running at the same time.  I haven’t tried this in awhile so I can’t give you exact symptoms but I suspect that if Project 2010 is involved the symptoms will be different then in a Project 2003/2007 scenario.  I’ve noticed that Project 2010 gives different error messages for the exact same problem when it occurs in Project 2003 or 2007.  -Anonymous The recommendation would be either not to use this feature if you have to have multiple versions of Project installed or to use only a single version of Project. You may get unexpected negative behaviours if you are using shared resource pools or resource pools even when you are not running multiple versions as I have found that they can get broken very easily. If you need these thing then it is probably best to use Project Server as it was created to solve many of these specific issues. Note: I would not even allow multiple people to access a network copy of a Project file because of the way Windows locks files in write mode. This can cause write-locks that get so bad a server restart is required I’ve seen user’s files get write-locked to the point where the only resolution is to reboot the server. Changing the default version to run for an extension So what if you want to change the default association from Project 2007 to Project 2010?   Figure: “Control Panel | Folder Options | Change the file associated with a file extension” Windows normally only lists the last version installed for a particular extension. You can select a specific version by selecting the program you want to change and clicking “Change program… | Browse…” and then selecting the .exe you want to use on the file system. Figure: You will need to select the exact version of “winproj.exe” that you want to run Conclusion Although it is possible to run multiple versions of Project on one system in the main it does not really make sense.

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  • Uninstall php5 installed from source

    - by diegomichel
    I have tried to install php5 from source , and it worked... Then for some reason need to install the official packets, so i tried a make uninstall and for my surprise there is such make uninstall... so i tried delete all the installed files by hand. Then installed the official debian packages and it worked fine... till i need install sqlite module, which give me the following error: php --version PHP Warning: PHP Startup: Unable to load dynamic library '/usr/lib/php5/20090626/pdo_sqlite.so' - /usr/lib/php5/20090626/pdo_sqlite.so: undefined symbol: php_pdo_register_driver in Unknown on line 0 PHP Warning: PHP Startup: Unable to load dynamic library '/usr/lib/php5/20090626/sqlite.so' - /usr/lib/php5/20090626/sqlite.so: undefined symbol: php_pdo_register_driver in Unknown on line 0 PHP 5.3.1-5 with Suhosin-Patch (cli) (built: Feb 22 2010 22:46:05) Copyright (c) 1997-2009 The PHP Group Zend Engine v2.3.0, Copyright (c) 1998-2009 Zend Technologies So i remember that manual install i did, and i think there is some old lib installed causing that problem, the bad thing is that there is not such make uninstall on the source code of php5... php-5.2.13 > make uninstall make: *** No rule to make target `uninstall'. Stop. I have tried reinstall and purge all php related packages via aptitude with not success. OS: Debian Squeeze. uname -a Linux desktop 2.6.32-trunk-amd64 #1 SMP Sun Jan 10 22:40:40 UTC 2010 x86_64 GNU/Linux Any idea how to fix that?

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  • Using virtualization infrastructure for J2EE application distribution- viable alternative?

    - by Dan
    Our company builds custom J2EE web solutions. At the moment, we use standard J2EE distribution mechanisms (ear/war archives). Application servers are generally administered by our clients' IT departments and since we do not have complete control over the environment, a lot of entropy can be introduced into the solution. For example: latest app. server patch not applied conflicting third party libraries inside the app. server root server runtime and tuning parameters not configured (for example, number of connections in database pool) We are looking into using virtualization infrastructure for J2EE application distribution. Instead of sending the ear/war archive, we’d send image with application server node and our application preinstalled. Some of the benefits are same as using with using virtualization infrastructure in general, namely better use of hardware resources. For us, it reduces the entropy of hosting infrastructure - distributing VM should be less affected by hosting environment. So far, the downside I see can be in application server licenses, here they will have to use dedicated servers for our solution, but this is generally already done that way. Also, there is a complexity with maintaining virtualization infrastructure, but this is often something IT departments have more experience with than with administering and fine-tuning J2EE solutions. Anyone has experience with this model? What are the downsides? Will we not just replace one type of complexity with other?

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  • Why is my connection slow?

    - by Jay R.
    I have a Dell Precision T5400 with a Broadcom 1Gb onboard NIC. For some strange reason, when I access machines on our local network, the best I can get is around 125KB/s download speed. My laptop that has a 10/100Mb NIC onboard usually gets around 300KB/s or better from the same network resource. Both machines are plugged into the same 1Gb switch which connects to our local network wall jack at 100Mb half duplex. There is also a printer plugged into the same switch at 100Mb full. The resource I'm using for the test is a 30MB zip file copied from a jetty webserver that is running as part of a cruisecontrol installation. The cruisecontrol installation is running WindowsXP with full real-time antivirus and Altiris patch management and inventory running. That stuff on its own is eating some of the download speed. I've seen the laptop reach into the multiple MB/s download speed before, but the desktop never seems to get past 125KB/s to 130KB/s. In WindowsXP, before I upgraded the driver in the desktop, it was that slow. In Fedora, it is still slow even though it appears to be using the same driver version as the upgraded Windows driver. The upgraded Windows driver is faster, but still not nearly as fast as the laptop. What gives? Any insight to improve the situation would be appreciated. Could it be that the BroadCom board just isn't that good, or the driver in linux is just not as good as the Windows one?

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  • How many reverse proxies (nginx, haproxy) is too many?

    - by Alysum
    I'm setting up a HA (high availability) cluster using nginx, haproxy & apache. I've been reading great things about nginx and haproxy. People tend to choose one or the other but I like both. Haproxy is more flexible for load balancing than nginx's simple round robin (even with the upstream-fair patch). But I'd like to keep nginx for redirecting non-https to https among other things right at the point of entry to the cluster. On the other hand, nginx is a lot faster for serving static contents and would reduce the load on the powerful apache which loves to eat a lot of RAM! Here is my planned setup: Load balancer: nginx listens on port 80/443 and proxy_forwards to haproxy on 8080 on the same server to load balance between the multiple nodes. Nodes: nginx on the node listens to requests coming from haproxy on 8080, if the content is static, serve it. But if it's a backend script (in my case PHP), proxy forward to apache2 on the same node server listenning on a different port number. Technically this setup works but my concerns are whether having the requests going through several proxies is going to slow down requests? Most of the requests will be PHP requests as the backends are services (which means groing from nginx - haproxy - nginx - apache). Thoughts? Cheers

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  • Why is my mono/XSP site loading slow?

    - by acidzombie24
    I have two sites on the same server. One is loading perfectly and incredibly fast. The other is an equally complex site except a bit less javascript and 0 images. Its taking several seconds to load and there is a 1 in 3 chance that i get a Http500 error. WTF I grabbed the lastest 2.6.? version of mono, mod_mono and xsp (libgdiplus-2.6.7, xsp-2.6.5, mod_mono-2.6.3 and mono 2.6.7) This is whats in apache error.log [Mon Jan 03 19:33:40 2011] [error] (70014)End of file found: read_data failed [Mon Jan 03 19:33:40 2011] [error] Command stream corrupted, last command was 1 [Mon Jan 03 19:34:52 2011] [error] (70014)End of file found: read_data failed [Mon Jan 03 19:34:52 2011] [error] (70014)End of file found: read_data failed [Mon Jan 03 19:34:52 2011] [error] Command stream corrupted, last command was 1 [Mon Jan 03 19:34:52 2011] [error] Command stream corrupted, last command was 1 this is the page error Internal Server Error The server encountered an internal error or misconfiguration and was unable to complete your request. Please contact the server administrator, webmaster@localhost and inform them of the time the error occurred, and anything you might have done that may have caused the error. More information about this error may be available in the server error log. Apache/2.2.9 (Debian) PHP/5.2.6-1+lenny9 with Suhosin-Patch mod_mono/2.6.3 Server

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  • BizTalk: Sample: Context routing and Throttling with orchestration

    - by Leonid Ganeline
    The sample demonstrates using orchestration for throttling and using context routing. Usually throttling is implemented on the host level (in BizTalk 2010 we can also using the host instance level throttling). Here is demonstrated the throttling with orchestration convoy that slows down message flow from some customers. Sample implements sort of quality service agreement layer for different kind of customers. The sample demonstrates the context routing between orchestrations. It has several advantages over the content routing. For example, we don’t have to create the property schema and promote properties on the schemas; we don’t have to change the message content to change routing. Use case:  The BizTalk application has a main processing orchestration that process all input messages. The application usually works as an OLTP application. Input messages came in random order without peaks, typical scenario for the on-line users. But sometimes the big data batch payloads come. These batches overload processing orchestrations. All processes, activated by on-line users after the payload, come to the same queue and are processed only after the payload. Result is on-line users can see significant delay in processing. It can be minutes or hours, depending of the batch size. Requirements: On-line user’s processing should work without delays. Big batches cannot disturb on-line users. There should be higher priority for the on-line users and the lower priority for the batches. Design: Decision is to divide the message flow in two branches, one for on-line users and second for batches. Branch with batches provides messages to the processing line with low priority, and the on-line user’s branch – with high priority. All messages are provided by hi-speed receive port. BTS.ReceivePortName context property is used for routing. The Router orchestration separates messages sent from on-line users and from the batch messages. But the Router does not use the BizTalk provided value of this property, the Router set up this value by itself. Router uses the content of the messages to decide if it is from on-line users or from batches. The message context property the BTS.ReceivePortName is changed respectively, its value works as a recipient address, as the “To” address for the next recipient orchestrations. Those next orchestrations are the BatchBottleneck and the MainProcess orchestrations. Messages with context equal “ToBatch” are filtered up by the BatchBottleneck orchestration. It is a unified convoy orchestration and it throttles the message flow, delaying the message delivery to the MainProcess orchestration. The BatchBottleneck orchestration changes the message context to the “ToProcess” and sends messages one after another with small delay in between. Delay can be configured in the BizTalk config file as:                 <appSettings>                                 <add key="GLD_Tests_TwoWayRouting_BatchBottleneck_DelayMillisec" value="100"/>                 </appSettings>   Of course, messages with context equal “ToProcess” are filtered up by the MainProcess orchestration.   NOTES: Filters with string values: In Orchestrations (the first Receive shape in orchestration) use string values WITH quotes; in Send Ports use string values WITHOUT quotes. Filters on the Send Ports are dynamic; we can change them in run-time. Filters on the Orchestrations are static; we can change them only in design-time. To check the existence of the promoted property inside orchestration use the Expression shape with construction like this:       if (BTS.ReceivePortName exists myMessage) { …; } It is not possible in the Message Assignment shape because using the “if” statement inside Message Assignment is prohibited. Several predefined context properties can behave in specific way. Say MessageTracking.OriginatingMessage or XMLNORM.DocumentSpecName, they are required some internal rules should be applied to the format or usage of this properties. MessageTracking.* parameters require you have to use tracking and you can get unexpected run-time errors in some cases. My recommendation is - use very limited set of the predefined context properties. To “attach” the new promoted property to the message, we have to use correlation. The correlation type should include this property. [Here is a good explanation by Saravana ] The sample code is here [sorry, temporary trubles with CodePlex].

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  • Why isn't 'Low Fragmentation Heap' LFH enabled by default on Windows Server 2003?

    - by James Wiseman
    I've been investigating an issue with a production Classic ASP website running on IIS6 which seems indicative of memory fragmentation. One of the suggestions of how to ameliorate this came from Stackoverflow: How can I find why some classic asp pages randomly take a real long time to execute?. It suggested flipping a setting in the site's global.asa file to 'turn on' Low Fragmentation Heap (LFH). The following code (with a registered version of the accompanying DLL) did the trick. Set LFHObj=CreateObject("TURNONLFH.ObjTurnOnLFH") LFHObj.TurnOnLFH() application("TurnOnLFHResult")=CStr(LFHObj.TurnOnLFHResult) (Really the code isn't that important to the question). An author of a linked post reported a seemingly magic resolution to this issue, and, reading around a little more, I discovered that this setting is enabled by default on Windows Server 2008. So, naturally, this left me a little concerned: Why is this setting not enabled by default on 2003, or If it works in 2008 why have Microsoft not issued a patch to enable it by default on 2003? I suspect the answer to the above is the same for both (if there is one). Obviously, we're testing it in a non-production environment, and doing an array of metrics and comparisons to deem if it does help us. But aside from this I'm really just trying to understand if there's any technical reason why we should do this, or if there are any gotchas that we need to be aware of.

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  • both ssl and non-ssl on single port

    - by Zulakis
    I would like to make my apache2 webserver serve both http and https on the same port. With the different method i tried it was either not working on http or on https.. How can I do this? Update: If I enable SSL and then visit the with http I get page like this: <!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN"> <html><head> <title>400 Bad Request</title> </head><body> <h1>Bad Request</h1> <p>Your browser sent a request that this server could not understand.<br /> Reason: You're speaking plain HTTP to an SSL-enabled server port.<br /> Instead use the HTTPS scheme to access this URL, please.<br /> <blockquote>Hint: <a href="https://server/"><b>https://server/</b></a></blockquote></p> <hr> <address>Apache/2.2.9 (Debian) PHP/5.2.6-1+lenny16 with Suhosin-Patch mod_ssl/2.2.9 OpenSSL/0.9.8g Server at server Port 443</address> </body></html> Because of this, it seems very much possible to have both http and https on the same port. A first step would be to change this default-page so it would present a 301-Moved header. Update2: According to this, it is possible. Now, the question is just how to configure apache to do it.

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  • Why is Apache htdigest authentication failing in IE10 on Windows 8?

    - by Kevin Fodness
    One of our developers reported that for the past week or two, the htdigest authentication that we have set up on our test sites in Apache is not working in IE10 on Windows 8. It's fine on IE10 on Windows 7, and it's fine on Chrome on Windows 8. The specific behavior is: Navigate to site with htdigest authentication enabled, username and password form pops up, enter correct username and password, and the username and password box pops up again. Potentially useful information: All patches applied on Windows 8 box No additional software on Windows 8 box other than Outlook 2013 and a browser test suite (Chrome, Firefox, Opera, Chrome Canary, Opera Next) Win8 running in a virtual machine on Xen Same behavior can be replicated on Win8/IE10 on Browserstack.com Server running Ubuntu 10.10 with Apache 2.2.16 This feels like a patch was applied to the Windows box that broke digest authentication for IE10 on Win8 (box configured for automatic updates). However, without knowing a specific date I can't necessarily nail this down. Has anyone else experienced this problem? EDIT: This problem only happens in the "Metro" interface, not when running IE10 in desktop mode. As of a few weeks ago, it worked fine even in the "Metro" interface.

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  • What program sent which packet to the network [closed]

    - by Erik Johansson
    I would like to have a tcpdump like program that shows which program sent a specific packet, instead of just getting the port number. This is a generic problem I've had on and off sometimes when you have and old tcpdump file lying around you have no way to find what program was sending that data.. The solution in how i can identify which process is making UDP traffic on linux ? is an indication that I can solve this with auditd, dTrace, OProfile or SystemTap, but doesn't show how to do it. I.e. it doesn't show the source port of the program calling bind().. The problem I had was strange UDP packets, and since those ports are so short lived it took me a while to solve this issue. I solved this by running an ugly hack similar to: while true; date +%s.%N;netstat -panut;done So either a method better than this hack, a replacement for tcpdump, or some way to get this info from the kernel so I can patch tcpdump. EDIT: This was asked on superuser "tracking what programs sends to net", no good solution though.

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  • Disadvantages of enabling 'Low Fragmentation Heap' LFH on Windows Server 2003?

    - by James Wiseman
    I've been investigating an issue with a production Classic ASP website running on IIS6 which seems indicative of memory fragmentation. One of the suggestions of how to ameliorate this came from Stackoverflow: How can I find why some classic asp pages randomly take a real long time to execute?. It suggested flipping a setting in the site's global.asa file to 'turn on' Low Fragmentation Heap (LFH). The following code (with a registered version of the accompanying DLL) did the trick. Set LFHObj=CreateObject("TURNONLFH.ObjTurnOnLFH") LFHObj.TurnOnLFH() application("TurnOnLFHResult")=CStr(LFHObj.TurnOnLFHResult) (Really the code isn't that important to the question). An author of a linked post reported a seemingly magic resolution to this issue, and, reading around a little more, I discovered that this setting is enabled by default on Windows Server 2008. So, naturally, this left me a little concerned: Why is this setting not enabled by default on 2003, or If it works in 2008 why have Microsoft not issued a patch to enable it by default on 2003? I suspect the answer to the above is the same for both (if there is one). Obviously, we're testing it in a non-production environment, and doing an array of metrics and comparisons to deem if it does help us. But aside from this I'm really just trying to understand if there's any technical reason why we should do this, or if there are any gotchas that we need to be aware of.

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  • WSUS KB978338 Chain of Supersession Incorrect?

    - by Kasius
    The chain appears to be KB978338 to KB978886 to KB2563894 to KB2588516 (newest). All four of these updates are approved on our WSUS server. KB978338 is listing as Not Applicable on all machines, because it has been superseded. This is the behavior I would expect. However, our security office is reporting that KB978338 should still be installed on all machines because its actual effect is not replicated by any of the updates that follow it. Here is the analysis I was sent: KB978886 applies to Vista SP1 only. The rollout of SP2 did not address the ISATAP vulnerability and reintroduces it. KB2563894 only updates two files (Tcpip.sys and Tcpipreg.sys). It does not update the 12 other affected ISATAP, UDP, and NUD .sys and .dll files. (MS11-064) KB2588516 addresses malformed continuous UDP packet overflow. But does not address the ISATAP related NUD and TCP .sys and .dll files. (MS11-083) So yes, many IP vulnerabilities. But each KB addresses specific issues that do not cross over to other KBs. We can install KB978338 by manually running the .MSU file, but we aren't certain if that will overwrite the couple files that get updated by later patches since we would be installing the patch out of order. Is the above analysis correct? Is the chain of supersession incorrectly defined? If it is, what is the proper way to report it so that it can be changed by the correct Microsoft team? We are currently using 32-bit and 64-bit installations of Vista SP2. Note: I should mention that I posted this on Technet as well. I will keep this up-to-date with any information I get on there.

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