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  • Linux Kernel Threads - scheduler

    - by Kartlee
    Hi People, Is Linux Kernel scheduler a part of init process? My understanding is that it is part of Kernel threads managed internally not visible to user by either top or ps. Please correct my understanding. Is it possible to view standard kernel threads through any kernel debugger to see how standard threads occupy cpu activity? -Kartlee

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  • Embedded Linux for total beginner

    - by sasayins
    Hi, I want to learn how to develop in embedded linux. What materials should I need? I don't have the actual embedded device so I plan to use some device emulator for the PC. I want to know how to load the kernel and the filesystem in the device. Many thanks.

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  • Timing the Linux Kernel boot-time optimisation

    - by CVS-2600Hertz-wordpress-com
    I am trying to optimise the boot-up time of linux on an embedded device (not PC) Currently to profile the boot-up sequence, I have enabled the timing info on printk logs. Is this the most optimum way? If not, how do i profile the boot-up sequence (with timing) with minimum overhead? PS: I have a terminal (of the device) over a serial-connection & I use TeraTerm over windows-XP to access it.

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  • How to boot linux direct to application on console with no login

    - by amanda
    I have a need to start an application on bootup on the linux console and I do not have a need for any type of login or security. I do not need any ALT-F1,F2,etc virtual consoles but I would like to allow SSH access via the network port for debugging, loading, etc. The application is a SDL graphics program running with fbcon as the SDL_VIDEODRIVER if that matters. I'm currently using Fedora 10 and 12 but any distro that supports SDL using the fbcon framebuffer would be acceptable.

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  • Source Code Linux built in Services

    - by Sirish Kumar
    Hi, I am looking at linux startup services, like Cron which runs at level 5 located in init.d, in the startup script I can only see the script file and location of binary file which is executed on startup. Where can I see the actual source code of this services

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  • SQL Server (2012 Enterprise) Browser service failing

    - by Watki02
    SQL Server (2012 Enterprise) Browser service failing I have a problem as described below: I have an instance of SQL Server 2012 Enterprise (thanks to MSDN) for local development on my PC. I try to start SQL server Browser Service from SQL Server Configuration Manager and it takes a long time to fail, then fails with: The request failed or the service did not respond in a timely fashion. Consult the event log or other applicable error logs for details. I checked event logs and found these errors in this order (all within the same 1-second time frame): The SQL Server Browser service port is unavailable for listening, or invalid. The SQL Server Browser service was unable to establish SQL instance and connectivity discovery. The SQL Server Browser is enabling SQL instance and connectivity discovery support. The SQL Server Browser service was unable to establish Analysis Services discovery. The SQL Server Browser service has started. The SQL Server Browser service has shutdown. I checked firewall rules and both port 1433 (TCP) and 1434 (UDP) are wide open, just as well - the programs and service binary had been "allowed through windows firewall". I started the "Analysis Services" service by hand and it works fine. Browser still won't start. Some History: Installed SQL 2008 R2 express advanced Installed SQL2012 Express advanced Uninstalled SQL 2008 R2 express advanced Installed 2012 SSDT and lots of features with Express install Installed a unique instance of SQL 2012 Enterprise with all features Uninstalled SSDT and reinstalled SSDT with Enterprise (solved a different problem) Uninstalled SQL 2012 Express Uninstalled SQL 2012 Enterprise Removed anything with "SQL" in the name from Control panel "Programs and features" Installed SQL 2012 Enterprise without Analysis services (This is where I noticed SQL Browser service was failing to start even on the install) Added the feature of Analysis Services (and everything else) via the installer (Browser continued to fail to start on the install) ======================== Other interesting facts: opening a command window with administrator and trying to run sqlbrowser.exe manually yielded: Microsoft Windows [Version 6.1.7601] Copyright (c) 2009 Microsoft Corporation. All rights reserved. C:\Windows\system32cd C:\Program Files (x86)\Microsoft SQL Server\90\Shared C:\Program Files (x86)\Microsoft SQL Server\90\Sharedsqlbrowser.exe -c SQLBrowser: starting up in console mode SQLBrowser: starting up SSRP redirection service SQLBrowser: failed starting SSRP redirection services -- shutting down. SQLBrowser: starting up OLAP redirection service SQLBrowser: Stopping the OLAP redirector C:\Program Files (x86)\Microsoft SQL Server\90\Shared As I try to repair the install it errors out saying The following error has occurred: Service 'SQLBrowser' start request failed. Click 'Retry' to retry the failed action, or click 'Cancel' to cancel this action and continue setup. For help, click: http://go.microsoft.com/fwlink?LinkID=20476&ProdName=Microsoft%20SQL%20Server&EvtSrc=setup.rll&EvtID=50000&ProdVer=11.0.2100.60&EvtType=0x4F9BEA51%25400xD3BEBD98%25401211%25401 Clicking retry fails every time. When clicking cancel I get: The following error has occurred: SQL Server Browser configuration for feature 'SQL_Browser_Redist_SqlBrowser_Cpu32' was cancelled by user after a previous installation failure. The last attempted step: Starting the SQL Server Browser service 'SQLBrowser', and waiting for up to '900' seconds for the process to complete. . For help, click: http://go.microsoft.com/fwlink?LinkID=20476&ProdName=Microsoft%20SQL%20Server&EvtSrc=setup.rll&EvtID=50000&ProdVer=11.0.2100.60&EvtType=0x4F9BEA51%25400xD3BEBD98%25401211%25401 When I go to uninstall the SQL Browser from "Programs and Features", it complains: Error opening installation log file. Verify that the specified log file location exists and is writable. Is there any way I can fix this short of re-imaging my computer and reinstalling from scratch? A possible approach would be to somehow really uninstall everything and delete all files related to SQL... is that a good idea, and how do I do that?

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  • Hyper-V virtual machine unable to get IP address from DHCP server running on same physical box

    - by Bronumski
    We have a Windows server 2008 R2 with two network cards running AD, DHCP, DNS and Hyper-V The first nic is setup with a static IP address and DHCP, WDS, and DNS are bound to it. The second nic is configured in Hyper-V to be only used by Hyper-V and has been automatically configured so that only the virtual switch is enabled on the adapter. DHCP and DNS work fine for all physical machines on the network. It also works for Virtual Machines running on another physical box. Virtual machines that are bound to the virtual switch network adapter are unable to get a IP address. If the virtual machine is given a static IP address with correct subnet, gateway and dns everything works. Has anyone else got this working?

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  • SQLExpress service unable to start Error code 17053

    - by Chris Sobolewski
    A user was instructed by their software support to upgrade a program and install SQLExpress as part of the installation process. Since that time, the service has been able to start, citing error 17053, which appears to be an authentication issue. Here is the error log: 2011-01-11 13:17:45.50 Server Microsoft SQL Server 2005 - 9.00.3042.00 (Intel X86) Feb 9 2007 22:47:07 Copyright (c) 1988-2005 Microsoft Corporation Express Edition on Windows NT 5.1 (Build 2600: Service Pack 2) 2011-01-11 13:17:45.50 Server (c) 2005 Microsoft Corporation. 2011-01-11 13:17:45.50 Server All rights reserved. 2011-01-11 13:17:45.50 Server Server process ID is 3332. 2011-01-11 13:17:45.50 Server Authentication mode is WINDOWS-ONLY. 2011-01-11 13:17:45.50 Server Logging SQL Server messages in file 'c:\Program Files\Microsoft SQL Server\MSSQL.1\MSSQL\LOG\ERRORLOG'. 2011-01-11 13:17:45.52 Server This instance of SQL Server last reported using a process ID of 2332 at 11/10/2010 2:15:24 PM (local) 11/10/2010 7:15:24 PM (UTC). This is an informational message only; no user action is required. 2011-01-11 13:17:45.52 Server Error: 17053, Severity: 16, State: 1. 2011-01-11 13:17:45.52 Server UpdateUptimeRegKey: Operating system error 5(Access is denied.) encountered. 2011-01-11 13:17:45.52 Server Registry startup parameters: 2011-01-11 13:17:45.52 Server -d c:\Program Files\Microsoft SQL Server\MSSQL.1\MSSQL\DATA\master.mdf 2011-01-11 13:17:45.52 Server -e c:\Program Files\Microsoft SQL Server\MSSQL.1\MSSQL\LOG\ERRORLOG 2011-01-11 13:17:45.52 Server -l c:\Program Files\Microsoft SQL Server\MSSQL.1\MSSQL\DATA\mastlog.ldf 2011-01-11 13:17:45.52 Server Error: 17113, Severity: 16, State: 1. 2011-01-11 13:17:45.52 Server Error 3(The system cannot find the path specified.) occurred while opening file 'c:\Program Files\Microsoft SQL Server\MSSQL.1\MSSQL\DATA\master.mdf' to obtain configuration information at startup. An invalid startup option might have caused the error. Verify your startup options, and correct or remove them if necessary. 2011-01-11 13:17:45.52 Server Error: 17053, Severity: 16, State: 1. 2011-01-11 13:17:45.52 Server UpdateUptimeRegKey: Operating system error 5(Access is denied.) encountered. 4 Server Error: 17053, Severity: 16, State: 1. 2011-01-11 13:08:21.34 Server UpdateUptimeRegKey: Operating system error 5(Access is denied.) encountered. 12:47:20.85 spid5s SQL Trace ID 1 was started by login "sa". 2011-01-11 12:47:20.90 spid5s Starting up database 'mssqlsystemresource'. 2011-01-11 12:47:20.93 spid5s The resource database build version is 9.00.3042. This is an informational message only. No user action is required. 2011-01-11 12:47:21.21 spid5s Error: 15466, Severity: 16, State: 1. 2011-01-11 12:47:21.21 spid5s An error occurred during decryption. 2011-01-11 12:47:21.38 spid8s Starting up database 'model'. 2011-01-11 12:47:21.38 Server Error: 17182, Severity: 16, State: 1. 2011-01-11 12:47:21.38 Server TDSSNIClient initialization failed with error 0x5, status code 0x90. 2011-01-11 12:47:21.38 Server Error: 17182, Severity: 16, State: 1. 2011-01-11 12:47:21.38 Server TDSSNIClient initialization failed with error 0x5, status code 0x1. 2011-01-11 12:47:21.38 Server Error: 17826, Severity: 18, State: 3. 2011-01-11 12:47:21.38 Server Could not start the network library because of an internal error in the network library. To determine the cause, review the errors immediately preceding this one in the error log. 2011-01-11 12:47:21.38 Server Error: 17120, Severity: 16, State: 1. 2011-01-11 12:47:21.38 Server SQL Server could not spawn FRunCM thread. Check the SQL Server error log and the Windows event logs for information about possible related problems. One lead I had was to change the SQL logon account from "Network Service" to "Local System". Unfortunately, that is resulting in the error message The Security ID Structure is Invalid [0x80070539] Any help either uninstalling or getting SQLExpress running would be fantastic.

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  • Windows Server 2008 R2 DNS Server not working?

    - by wolfvilleian
    Hi, I have a server running Windows Server 2008 R2 hosting a DNS server, exchange 2010 and is a domain controller. One computer on the network (and domain) can ping the server 25% of the time, also when I try to ping it's own hostname it also does not work. However another computer that is on the domain can ping it fine, and another computer on the network but not domain can ping fine as well. The computer that cannot ping the server is setup to use the DNS server running on the server only (secondary dns points to nothing) and it will resolve the hostname of the server to the external IP not internal when the other two computers correctly resolve the internal All 3 computers and server are connected directly into the same switch. Does anyone have any ideas on how to fix this? Thanks

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  • Windows Server 2008 R2 DNS Server not working?

    - by wolfvilleian
    I have a server running Windows Server 2008 R2 hosting a DNS server, exchange 2010 and is a domain controller. One computer on the network (and domain) can ping the server 25% of the time, also when I try to ping it's own hostname it also does not work. However another computer that is on the domain can ping it fine, and another computer on the network but not domain can ping fine as well. The computer that cannot ping the server is setup to use the DNS server running on the server only (secondary dns points to nothing) and it will resolve the hostname of the server to the external IP not internal when the other two computers correctly resolve the internal All 3 computers and server are connected directly into the same switch. Does anyone have any ideas on how to fix this? Thanks

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  • IBM Server searching for secondary server

    - by user1241438
    I just bought the following server IBM System x3950 Server, 4 x 3.0GHz Dual Core, 32GB, 6 x 73.4GB 10K SAS RAID, 256MB BBWC, 2x Power, CD-RW/DVD When i boot it up, it says "Searching for secondary server" and hangs their for almost 10 mins. After 10 mins, it says timeout on searching chassis 2. But after this it proceed to boot the OS properly. But my frustration, i need to wait for almost 15 mins to boot everytime. How do i prevent this error message.

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  • Server load increases by lot of httpd request with same PID

    - by user3740955
    I can see that my server load increases to more than 200-300 range. Before 1 week the maximum load was around 20-25. In top and ps -ef i can see a lot of httpd threads and the PPID of most of the httpd request are of the same PID. When i verified this the parent process ID is of root. Please let me know how i can reduce the server load. I have searched a lot for this but not able to find out a proper solution for this. Please let me know. Please see below a part of the top output. apache 29698 2062 1 16:54 ? 00:00:00 /usr/sbin/httpd apache 29700 2062 3 16:54 ? 00:00:00 /usr/sbin/httpd apache 29701 2062 10 16:54 ? 00:00:02 /usr/sbin/httpd apache 29702 2062 0 16:54 ? 00:00:00 /usr/sbin/httpd apache 29703 2062 1 16:54 ? 00:00:00 /usr/sbin/httpd apache 29705 2062 0 16:54 ? 00:00:00 /usr/sbin/httpd apache 29706 2062 3 16:54 ? 00:00:00 /usr/sbin/httpd apache 29707 2062 0 16:54 ? 00:00:00 /usr/sbin/httpd apache 29708 2062 1 16:54 ? 00:00:00 /usr/sbin/httpd apache 29709 2062 0 16:54 ? 00:00:00 /usr/sbin/httpd apache 29710 2062 0 16:54 ? 00:00:00 /usr/sbin/httpd apache 29711 2062 0 16:54 ? 00:00:00 /usr/sbin/httpd apache 29712 2062 0 16:54 ? 00:00:00 /usr/sbin/httpd Server version: Apache/2.2.3

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  • SQL SERVER – SHRINKFILE and TRUNCATE Log File in SQL Server 2008

    - by pinaldave
    Note: Please read the complete post before taking any actions. This blog post would discuss SHRINKFILE and TRUNCATE Log File. The script mentioned in the email received from reader contains the following questionable code: “Hi Pinal, If you could remember, I and my manager met you at TechEd in Bangalore. We just upgraded to SQL Server 2008. One of our jobs failed as it was using the following code. The error was: Msg 155, Level 15, State 1, Line 1 ‘TRUNCATE_ONLY’ is not a recognized BACKUP option. The code was: DBCC SHRINKFILE(TestDBLog, 1) BACKUP LOG TestDB WITH TRUNCATE_ONLY DBCC SHRINKFILE(TestDBLog, 1) GO I have modified that code to subsequent code and it works fine. But, are there other suggestions you have at the moment? USE [master] GO ALTER DATABASE [TestDb] SET RECOVERY SIMPLE WITH NO_WAIT DBCC SHRINKFILE(TestDbLog, 1) ALTER DATABASE [TestDb] SET RECOVERY FULL WITH NO_WAIT GO Configuration of our server and system is as follows: [Removed not relevant data]“ An email like this that suddenly pops out in early morning is alarming email. Because I am a dead, busy mind, so I had only one min to reply. I wrote down quickly the following note. (As I said, it was a single-minute email so it is not completely accurate). Here is that quick email shared with all of you. “Hi Mr. DBA [removed the name] Thanks for your email. I suggest you stop this practice. There are many issues included here, but I would list two major issues: 1) From the setting database to simple recovery, shrinking the file and once again setting in full recovery, you are in fact losing your valuable log data and will be not able to restore point in time. Not only that, you will also not able to use subsequent log files. 2) Shrinking file or database adds fragmentation. There are a lot of things you can do. First, start taking proper log backup using following command instead of truncating them and losing them frequently. BACKUP LOG [TestDb] TO  DISK = N'C:\Backup\TestDb.bak' GO Remove the code of SHRINKING the file. If you are taking proper log backups, your log file usually (again usually, special cases are excluded) do not grow very big. There are so many things to add here, but you can call me on my [phone number]. Before you call me, I suggest for accuracy you read Paul Randel‘s two posts here and here and Brent Ozar‘s Post here. Kind Regards, Pinal Dave” I guess this post is very much clear to you. Please leave your comments here. As mentioned, this is a very huge subject; I have just touched a tip of the ice-berg and have tried to point to authentic knowledge. Reference: Pinal Dave (http://blog.SQLAuthority.com) Filed under: Pinal Dave, SQL, SQL Authority, SQL Backup and Restore, SQL Data Storage, SQL Query, SQL Scripts, SQL Server, SQL Tips and Tricks, T SQL, Technology

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  • SQL SERVER – What is Denali?

    - by pinaldave
    I see following question quite common on Twitter or in my email box. “What is Denali?” Denali is code name of SQL Server 2011. Here is the list of the code name of other versions of SQL Server. In 1988, Microsoft released its first version of SQL Server. It was developed jointly by Microsoft and Sybase for the OS/2 platform. 1993 – SQL Server 4.21 for Windows NT 1995 – SQL Server 6.0, codenamed SQL95 1996 – SQL Server 6.5, codenamed Hydra 1999 – SQL Server 7.0, codenamed Sphinx 1999 – SQL Server 7.0 OLAP, codenamed Plato 2000 – SQL Server 2000 32-bit, codenamed Shiloh (version 8.0) 2003 – SQL Server 2000 64-bit, codenamed Liberty 2005 – SQL Server 2005, codenamed Yukon (version 9.0) 2008 – SQL Server 2008, codenamed Katmai (version 10.0) 2010 – SQL Server 2008 R2, Codenamed Kilimanjaro (aka KJ) Next – SQL Server 2011, Codenamed Denali Any guesses what should be the next version after 2011 should be codenamed? Reference: Pinal Dave (http://blog.SQLAuthority.com) Filed under: SQL, SQL Authority, SQL Query, SQL Server, SQL Tips and Tricks, T SQL, Technology

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  • What incidentals do server maintenance people/devs need?

    - by SeniorShizzle
    I'm trying to put together a thank-you package for clients who are server-side developers and in charge of their company's servers and databases. Since I've never been in that line of work before, I would like to know what it is like. Get inside your heads, for instance. My first thought was (don't hate me) a few patch cables. I don't know if you guys actually need these often or anything. What are some similar things that you like or need for your lives at work. Small incidentals less than $10 are preferred, like Coffee or a notebook, screwdrivers. Et cetera.

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  • samba joined to AD canot see users when in the security tab on client

    - by Jonathan
    I've got samba joined via kerberos and winbindd to our AD network and user authentication and everything else is working great. However when I try to add users/groups to file permissions it tells me they are not found. All the users groups show up fine with getent so I'm not sure why they are not showing up. Here is my smb.conf and I would much appreciate any help with this. #GLOBAL PARAMETERS [global] socket options = TCP_NODELAY IPTOS_LOWDELAY SO_KEEPALIVE SO_RCVBUF=11264 SO_SNDBUF=11264 workgroup = [hidden] realm = [hidden] preferred master = no server string = xerxes web/file server security = ADS encrypt passwords = yes log level = 3 log file = /var/log/samba/%m max log size = 50 printcap name = cups printing = cups winbind enum users = Yes winbind enum groups = Yes winbind use default domain = Yes winbind nested groups = Yes winbind separator = + winbind refresh tickets = yes idmap uid = 1600-20000 idmap gid = 1600-20000 template primary group = "Domain Users" template shell = /bin/bash kerberos method = system keytab nt acl support = yes [homes] comment = Home Direcotries valid users = %S read only = No browseable = No create mask = 0770 directory mask = 0770 force create mode = 0660 force directory mode = 2770 inherit owner = no [test] comment = Test path=/mnt/test writeable=yes valid users = %s create mask = 0770 directory mask = 0770 force create mode = 0660 force directory mode = 2770 inherit owner = no [printers] comment = All Printers path = /var/spool/cups browseable = no printable = yes

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  • SQL Server – Learning SQL Server Performance: Indexing Basics – Interview of Vinod Kumar by Pinal Dave

    - by pinaldave
    Recently I just wrote a blog post on about Learning SQL Server Performance: Indexing Basics and I received lots of request that if we can share some insight into the course. Every single time when Performance is discussed, Indexes are mentioned along with it. In recent times, data and application complexity is continuously growing.  The demand for faster query response, performance, and scalability by organizations is increasing and developers and DBAs need to now write efficient code to achieve this. When we developed the course – we made sure that this course remains practical and demo heavy instead of just theories on this subject. Vinod Kumar and myself we often thought about this and realized that practical understanding of the indexes is very important. One can not master every single aspects of the index. However there are some minimum expertise one should gain if performance is one of the concern. Here is 200 seconds interview of Vinod Kumar I took right after completing the course. Reference: Pinal Dave (http://blog.sqlauthority.com) Filed under: PostADay, SQL, SQL Authority, SQL Index, SQL Performance, SQL Query, SQL Server, SQL Tips and Tricks, SQLServer, T SQL, Technology, Video

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  • Event-based server-gameloop in a server based game

    - by Chris
    I know that this site is full of questions about fixed gameloops and variable gameloops and different types of threading. But I coult find barely nothing that is related to server loops. The server has no screen to draw on. It could just run as fast as possible, but of course this makes no sense. But should it really use single "ticks" and send the updates periodically after each tick and wait for the next "tick" to update its state. Is it applicable to replace the gameloop by multilpe events? Suchs as incoming network traffic or timers? I often heared that a gameloop should be determistic, but does it really matter? For instance, when you play a shooter game against humand players and/or AI you proably would never be ably to repeat the same input twice. Is it a good idea to lose determistic behavior if it is nearly impossible to reprodruce the same input twice? So this question is more or less about whether an strictly event-based gameloop is adviseable or not and what are the pros and cons. I could imagene that an event-based gameloop could perform much faster and smoother, since you don't have bug CPU-spikes during the beginning of a new "tick". The fact that I could not find much about an event-based gameloop for servers leads me to the conclusion that inefficient or too complicated to get a real benefit from it. I'm sure if this is enough to get an idea from what I'm interessted to know, but I hope so.

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  • SQL SERVER – How to an Add Identity Column to Table in SQL Server

    - by Pinal Dave
    Here is the question I received on SQLAuthority Fan Page. “How do I add an identity column to Table in SQL Server? “ Sometime the questions are very very simple but the answer is not easy to find. Scenario 1: If you are table does not have identity column, you can simply add the identity column by executing following script: ALTER TABLE MyTable ADD ID INT IDENTITY(1,1) NOT NULL Scenario 2: If your table already has a column which you want to convert to identity column, you can’t do that directly. There is a workaround for the same which I have discussed in depth over the article Add or Remove Identity Property on Column. Scenario 3: If your table has already identity column and you can want to add another identity column for any reason – that is not possible. A table can have only one identity column. If you try to have multiple identity column your table, it will give following error. Msg 2744, Level 16, State 2, Line 2 Multiple identity columns specified for table ‘MyTable‘. Only one identity column per table is allowed. Leave a comment if you have any suggestion. Reference : Pinal Dave (http://blog.SQLAuthority.com) Filed under: PostADay, SQL, SQL Authority, SQL Query, SQL Server, SQL Tips and Tricks, T SQL Tagged: Identity

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  • SQL SERVER – Introduction to PERCENT_RANK() – Analytic Functions Introduced in SQL Server 2012

    - by pinaldave
    SQL Server 2012 introduces new analytical functions PERCENT_RANK(). This function returns relative standing of a value within a query result set or partition. It will be very difficult to explain this in words so I’d like to attempt to explain its function through a brief example. Instead of creating a new table, I will be using the AdventureWorks sample database as most developers use that for experiment purposes. Now let’s have fun following query: USE AdventureWorks GO SELECT SalesOrderID, OrderQty, RANK() OVER(ORDER BY SalesOrderID) Rnk, PERCENT_RANK() OVER(ORDER BY SalesOrderID) AS PctDist FROM Sales.SalesOrderDetail WHERE SalesOrderID IN (43670, 43669, 43667, 43663) ORDER BY PctDist DESC GO The above query will give us the following result: Now let us understand the resultset. You will notice that I have also included the RANK() function along with this query. The reason to include RANK() function was as this query is infect uses RANK function and find the relative standing of the query. The formula to find PERCENT_RANK() is as following: PERCENT_RANK() = (RANK() – 1) / (Total Rows – 1) If you want to read more about this function read here. Now let us attempt the same example with PARTITION BY clause USE AdventureWorks GO SELECT SalesOrderID, OrderQty, ProductID, RANK() OVER(PARTITION BY SalesOrderID ORDER BY ProductID ) Rnk, PERCENT_RANK() OVER(PARTITION BY SalesOrderID ORDER BY ProductID ) AS PctDist FROM Sales.SalesOrderDetail s WHERE SalesOrderID IN (43670, 43669, 43667, 43663) ORDER BY PctDist DESC GO Now you will notice that the same logic is followed in follow result set. I have now quick question to you – how many of you know the logic/formula of PERCENT_RANK() before this blog post? Reference: Pinal Dave (http://blog.SQLAuthority.com) Filed under: Pinal Dave, PostADay, SQL, SQL Authority, SQL Function, SQL Query, SQL Scripts, SQL Server, SQL Tips and Tricks, T SQL, Technology

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