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  • MSSQL Efficiently dropping a group of rows with millions and millions of rows

    - by Net Citizen
    I recently asked this question: http://stackoverflow.com/questions/2519183/ms-sql-share-identity-seed-amongst-tables (Many people wondered why) I have the following layout of a table: Table: Stars starId bigint categoryId bigint starname varchar(200) But my problem is that I have millions and millions of rows. So when I want to delete stars from the table Stars it is too intense on MS SQL. I cannot use built in partitioning for 2005+ because I do not have an enterprise license. When I do delete though, I always delete a whole category Id at a time. I thought of doing a design like this: Table: Star_1 starId bigint CategoryId bigint constaint rock=1 starname varchar(200) Table: Star_2 starId bigint CategoryId bigint constaint rock=2 starname varchar(200) In this way I can delete a whole category and hence millions of rows in O(1) by doing a simple drop table. My question is, is it a problem to have thousands of tables in your MS SQL? The drop in O(1) is extremely desirable to me. Maybe there's a completely different solution I'm not thinking of?

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  • C++ cin keeps skipping.....

    - by user69514
    I am having problems with my program. WHen I run it, it asks the user for the album, the title, but then it just exits the loop without asking for the price and the sale tax. Any ideas what's going on? This is a sample run Discounts effective for September 15, 2010 Classical 8% Country 4% International 17% Jazz 0% Rock 16% Show 12% Are there more transactions? Y/N y Enter Artist of CD: Sevendust Enter Title of CD: Self titled Enter Genre of CD: Rock enter price Are there more transactions? Y/N Thank you for shopping with us! Program code: #include <iostream> #include <string> using namespace std; int counter = 0; string discount_tiles[] = {"Classical", "Country", "International", "Jazz", "Rock", "Show"}; int discount_amounts[] = {8, 4, 17, 0, 16, 12, 14}; string date = "September 15, 2010"; // Array Declerations //Artist array char** artist = new char *[100]; //Title array char** title = new char *[100]; //Genres array char** genres = new char *[100]; //Price array double* price[100]; //Discount array double* tax[100]; // sale price array double* sale_price[100]; //sale tax array double* sale_tax[100]; //cash price array double* cash_price[100]; //Begin Prototypes char* getArtist(); char* getTitle(); char* getGenre(); double* getPrice(); double* getTax(); unsigned int* AssignDiscounts(); void ReadTransaction (char ** artist, char ** title, char ** genre, float ** cash, float & taxrate, int albumcount); void computesaleprice(); bool AreThereMore (); //End Prototypes bool areThereMore () { char answer; cout << "Are there more transactions? Y/N" << endl; cin >> answer; if (answer =='y' || answer =='Y') return true; else return false; } char* getArtist() { char * artist= new char [100]; cout << "Enter Artist of CD: " << endl; cin.getline(artist,100); cin.ignore(); return artist; } char* getTitle() { char * title= new char [100]; cout << "Enter Title of CD: " << endl; cin.getline(title,100); cin.ignore(); return title; } char* getGenre() { char * genre= new char [100]; cout << "Enter Genre of CD: " << endl; cin.getline(genre,100); cin.ignore(); return genre; } double* getPrice() { //double* price = new double(); //cout << "Enter Price of CD: " << endl; //cin >> *price; //return price; double p = 0.0; cout<< "enter price" << endl; cin >> p; cin.ignore(); double* pp = &p; return pp; } double* getTax() { double* tax= new double(); cout << "Enter local sales tax: " << endl; cin >> *tax; return tax; } int findDiscount(string str){ if(str.compare(discount_tiles[0]) == 0) return discount_amounts[0]; else if(str.compare(discount_tiles[0]) == 0) return discount_amounts[1]; else if(str.compare(discount_tiles[0]) == 0) return discount_amounts[2]; else if(str.compare(discount_tiles[0]) == 0) return discount_amounts[3]; else if(str.compare(discount_tiles[0]) == 0) return discount_amounts[4]; else if(str.compare(discount_tiles[0]) == 0) return discount_amounts[5]; else{ cout << "Error in findDiscount function" << endl; return 0; } } void computesaleprice() { /** fill in array for all purchases **/ for( int i=0; i<=counter; i++){ double temp = *price[i]; temp -= findDiscount(genres[i]); double* tmpPntr = new double(); tmpPntr = &temp; sale_price[i] = tmpPntr; delete(&temp); delete(tmpPntr); } } void printDailyDiscounts(){ cout << "Discounts effective for " << date << endl; for(int i=0; i < 6; i++){ cout << discount_tiles[i] << "\t" << discount_amounts[i] << "%" << endl; } } //Begin Main int main () { for( int i=0; i<100; i++){ artist[i]=new char [100]; title[i]=new char [100]; genres[i]=new char [100]; price[i] = new double(0.0); tax[i] = new double(0.0); } // End Array Decleration printDailyDiscounts(); bool flag = true; while(flag == true){ if(areThereMore() == true){ artist[counter] = getArtist(); title[counter] = getTitle(); genres[counter] = getGenre(); price[counter] = getPrice(); //tax[counter] = getTax(); //counter++; flag = true; } else { flag = false; } } //compute sale prices //computesaleprice(); cout << "Thank you for shopping with us!" << endl; return 0; } //End Main /** void ReadTransaction (char ** artist, char ** title, char ** genre, float ** cash, float & taxrate, int albumcount) { strcpy(artist[albumcount],getArtist()); strcpy(title[albumcount],getTitle()); strcpy(genre[albumcount],getGenre()); //cash[albumcount][0]=computesaleprice();??????? //taxrate=getTax;?????????????? } * * */ unsigned int * AssignDiscounts() { unsigned int * discount = new unsigned int [7]; cout << "Enter Classical Discount: " << endl; cin >> discount[0]; cout << "Enter Country Discount: " << endl; cin >> discount[1]; cout << "Enter International Discount: " << endl; cin >> discount[2]; cout << "Enter Jazz Discount: " << endl; cin >> discount[3]; cout << "Enter Pop Discount: " << endl; cin >> discount[4]; cout << "Enter Rock Discount: " << endl; cin >> discount[5]; cout << "Enter Show Discount: " << endl; cin >> discount[6]; return discount; } /** char ** AssignGenres () { char ** genres = new char * [7]; for (int x=0;x<7;x++) genres[x] = new char [20]; strcpy(genres [0], "Classical"); strcpy(genres [1], "Country"); strcpy(genres [2], "International"); strcpy(genres [3], "Jazz"); strcpy(genres [4], "Pop"); strcpy(genres [5], "Rock"); strcpy(genres [6], "Show"); return genres; } **/ float getTax(float taxrate) { cout << "Please enter store tax rate: " << endl; cin >> taxrate; return taxrate; }

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  • Tag/Keyword based recommendation

    - by Hellnar
    Hello I am wondering what algorithm would be clever to use for a tag driven e-commerce enviroment: Each item has several tags. IE: Item name: "Metallica - Black Album CD", Tags: "metallica", "black-album", "rock", "music" Each user has several tags and friends(other users) bound to them. IE: Username: "testguy", Interests: "python", "rock", "metal", "computer-science" Friends: "testguy2", "testguy3" I need to generate recommendations to such users by checking their interest tags and generating recommendations in a sophisticated way. Ideas: A Hybrid recommendation algorithm can be used as each user has friends.(mixture of collaborative + context based recommendations). Maybe using user tags, similar users (peers) can be found to generate recommendations. Maybe directly matching tags between users and items via tags. Any suggestion is welcome. Any python based library is also welcome as I will be doing this experimental engine on python language.

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  • SQL Server Efficiently dropping a group of rows with millions and millions of rows

    - by Net Citizen
    I recently asked this question: http://stackoverflow.com/questions/2519183/ms-sql-share-identity-seed-amongst-tables (Many people wondered why) I have the following layout of a table: Table: Stars starId bigint categoryId bigint starname varchar(200) But my problem is that I have millions and millions of rows. So when I want to delete stars from the table Stars it is too intense on SQL Server. I cannot use built in partitioning for 2005+ because I do not have an enterprise license. When I do delete though, I always delete a whole category Id at a time. I thought of doing a design like this: Table: Star_1 starId bigint CategoryId bigint constaint rock=1 starname varchar(200) Table: Star_2 starId bigint CategoryId bigint constaint rock=2 starname varchar(200) In this way I can delete a whole category and hence millions of rows in O(1) by doing a simple drop table. My question is, is it a problem to have hundreds of thousands of tables in your SQL Server? The drop in O(1) is extremely desirable to me. Maybe there's a completely different solution I'm not thinking of?

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  • STDOUT can not return to Screen

    - by rockyurock
    STDOUT can not return to Screen Hello all below is the part of my code, my code enters "if loop" with $value =1 and output of the process "iperf.exe" is getting into my_output.txt. As i am timing out the process after alram(20sec) time,also wanted to capture the output of this process only. then after i want to continue to the command prompt but i am not able to return to the command promt... not only this code itself does not PRINT on the command prompt , rather it is priniting on the my_output.txt file (i am looping this if loop through rest of my code) output.txt ========== inside value loop2 ------------------------------------------------------------ Server listening on UDP port 5001 Receiving 1470 byte datagrams UDP buffer size: 8.00 KByte (default) ------------------------------------------------------------ [160] local 10.232.62.151 port 5001 connected with 10.232.62.151 port 1505 [ ID] Interval Transfer Bandwidth Jitter Lost/Total Datagrams [160] 0.0- 5.0 sec 2.14 MBytes 3.59 Mbits/sec 0.000 ms 0/ 1528 (0%) inside value loop3 clue1 clue2 inside value loop4 one iperf completed Transfer Transfer Starting: Intent { act=android.settings.APN_SETTINGS } ******AUTOMATION COMPLETED****** Looks some problem with reinitializing the STDOUT.. even i tried to use close(STDOUT); but again it did not return to STDOUT could sombbody please help out ?? /rocky CODE:: if($value) { my $file = 'my_output.txt'; use Win32::Process; print"inside value loop\n"; # redirect stdout to a file open STDOUT, '>', $file or die "can't redirect STDOUT to <$file> $!"; Win32::Process::Create(my $ProcessObj, "iperf.exe", "iperf.exe -u -s -p 5001", 0, NORMAL_PRIORITY_CLASS, ".") || die ErrorReport(); $alarm_time = $IPERF_RUN_TIME+2; #20sec print"inside value loop2\n"; sleep $alarm_time; $ProcessObj->Kill(0); sub ErrorReport{ print Win32::FormatMessage( Win32::GetLastError() ); } print"inside value loop3\n"; print"clue1\n"; #close(STDOUT); print"clue2\n"; print"inside value loop4\n"; print"one iperf completed\n"; } my $data_file="my_output.txt"; open(ROCK, $data_file)|| die("Could not open file!"); @raw_data=<ROCK>; @COUNT_PS =split(/ /,$raw_data[7]); my $LOOP_COUNT_PS_4 = $COUNT_PS[9]; my $LOOP_COUNT_PS_5 = $COUNT_PS[10]; print "$LOOP_COUNT_PS_4\n"; print "$LOOP_COUNT_PS_5\n"; my $tput_value = "$LOOP_COUNT_PS_4"." $LOOP_COUNT_PS_5"; print "$tput_value"; close(ROCK); print FH1 "\n $count \| $tput_value \n"; regds rakesh

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  • Why are these strings escaping from my regular expression in python?

    - by dohkoxar
    In my code, I load up an entire folder into a list and then try to get rid of every file in the list except the .mp3 files. import os import re path = '/home/user/mp3/' dirList = os.listdir(path) dirList.sort() i = 0 for names in dirList: match = re.search(r'\.mp3', names) if match: i = i+1 else: dirList.remove(names) print dirList print i After I run the file, the code does get rid of some files in the list but keeps these two especifically: ['00. Various Artists - Indie Rock Playlist October 2008.m3u', '00. Various Artists - Indie Rock Playlist October 2008.pls'] I can't understand what's going on, why are those two specifically escaping my search.

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  • When a restore isn’t really complete

    - by John Paul Cook
    This week I discovered that restoring from a full backup doesn’t always restore SQL Server to the same state it was in when the backup was made. There are three settings that, if enabled, are not restored after a database restore. Thanks to Greg Low for pointing out that the list of affected settings is found in the SQL Server 2008 Upgrade Technical Reference Guide from which I quote: · is_broker_enabled · is_honor_broker_priority_on · is_trustworthy_on Detaching and attaching a database will also...(read more)

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  • Google I/O 2011: Fireside Chat with the App Engine Team

    Google I/O 2011: Fireside Chat with the App Engine Team Max Ross, Max is a Software Engineer on the App Engine team where he leads the development of the datastore & occasionally tinkers with the Java runtime. He is also the founder of the Hibernate Shards project. Alon Levi, Sean Lynch, Greg Dalesandre, Guido van Rossum, Brett Slatkin, Peter Magnusson, Mickey Kataria, Peter McKenzie Fireside chat with the App Engine team From: GoogleDevelopers Views: 2045 5 ratings Time: 01:01:25 More in Entertainment

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  • The .NET Rocks! Visual Studio 2010 Road Trip

    - by Laila
    Carl Franklin and Richard Campbell, the two .NET Rocks radio show hosts, have decided to set off to 15 cities in the US, between April 19th and May 7th, in their DotNetMobile (a 30 foot RV). What for you'll ask me? Well, to drive around the US, meet up with .NET developers, and show off the latest and greatest in Visual Studio 2010 and .NET 4.0! Each evening, they stop in a city and host a three hour event in front of a 100 to 300 crowd of developers, where Carl is showing off media features in Silverlight 4 and their road trip tracking application, whilst Richard is demo-ing the web performance testing features of VS2010 using his portable server rig. But before they take to the stage, they have a special guest brought in - a rock star from the Visual Studio world - whom they interview for an hour as a .NET Rock episode. So far, they've had - amongst others - Phil Haack, a Program Manager with the ASP.NET team working on ASP.NET MVC, Dan Fernandez, an Evangelism Manager in the Developer and Platform Evangelism team at Microsoft, and Beth Massi, Senior Program Manager on the Visual Studio Community Team at Microsoft. I love the fact that the audience gets a chance to participate, ask questions and have a great laugh, as you can hear in the first episode! Along the way, the .NET Rocks guys are giving away great prizes (including .NET Reflector Pro, ANTS Memory Profiler licenses, and "40" LCD TVs!). Even more out of the ordinary, at each stop on the road trip, one lucky attendee (who entered in the Ride Along competition) gets to jump in the RV with Carl and Richard and ride along with them to the next stop on the roadtrip. How cool is that! Richard told us: "Our first winner in Mountain View was Eric Ziko. I was looking for him to announce that he had won, when he found us and gave us a bottle of scotch he had brought just to say 'thanks for the great show'. We all had a toast from the bottle the next night when he headed back home." Cheeky! There's still space to a few of these events, so if you want to attend, register now, because it's first come first serve. We're grateful to Richard and Carl for giving us the opportunity to sponsor this major .NET event! A unique .NET adventure worth following for sure. Cheers, Laila

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  • Service Broker Solutions - Don't Forget the Basics

    - by AllenMWhite
    After finally getting a Service Broker solution implemented successfully, I'm really impressed with the technology, and frustrated how difficult it can be to implement and get it really working as expected. First, understand the technology. There are some great resources out there to help you get started. The first place to go is Klaus Aschenbrenner's book, the one that Greg Low reviewed this past week. It's an amazing resource and played a large part in my success. (I bought it for my Kindle, and...(read more)

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  • The Dos and Don'ts of Database Indexing

    The creation of database indexes is the last thing developers and database designers think about--almost an afterthought. Greg Larsen shows you some of the dos and don'ts of indexing to help you pick reasonable indexes at design time.

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  • Service Broker Solutions - Don't Forget the Basics

    - by AllenMWhite
    After finally getting a Service Broker solution implemented successfully, I'm really impressed with the technology, and frustrated how difficult it can be to implement and get it really working as expected. First, understand the technology. There are some great resources out there to help you get started. The first place to go is Klaus Aschenbrenner's book, the one that Greg Low reviewed this past week. It's an amazing resource and played a large part in my success. (I bought it for my Kindle, and...(read more)

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  • Google I/O 2011: YouTube's iframe Player: The Future of Embedding

    Google I/O 2011: YouTube's iframe Player: The Future of Embedding Jeffrey Posnick, Jarek Wilkiewicz, Greg Schechter YouTube players allow for video playback in web applications. The latest YouTube's embedded iframe player supports both Flash and HTML5 video and exposes a rich API which lets you control the YouTube playback experience. We'll give you the details on how the API was developed, and show you how it can power the videos on your own website. From: GoogleDevelopers Views: 11412 142 ratings Time: 54:37 More in Science & Technology

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  • Only a few places left for the SQL Social evening on 16th March

    - by simonsabin
    We've got over 50 people registered for the SQLSocial event on 16th March with Itzik Ben-Gan, Greg Low, Davide Mauri and Bill Vaughn I need to finalise numbers on early next week so if you want to come along please register asap, otherwise I can't promise that we'll have space for you. To register use he form on herehttp://sqlsocial.com/events.aspx. I look forward to hearing from you.

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  • A Few Cool Things You Can Identify Using the Default Trace

    If you are running an instance of SQL Server 2005 and above then most likely that instance is running the default trace. This default trace is a canned Profiler server side trace that automatically starts up when SQL Server starts. In this article Greg Larsen explains more about the default trace and shows you how to glean some event information from the trace files created by this background trace process.

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  • Efficient SQL Server Indexing by Design

    Having a good set of indexes on your SQL Server database is critical to performance. Efficient indexes don't happen by accident; they are designed to be efficient. Greg Larsen discusses whether primary keys should be clustered, when to use filtered indexes and what to consider when using the Fill Factor.

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  • The Latest Dish: Black Eyed Peas to Headline at Appreciation Event

    - by Justin Kestelyn
    If you're coming to Oracle Develop Conference to fill up on content, collaboration, and community, be sure to save room for dessert. At the Wednesday evening "Appreciation Event," which is open to Oracle Develop, JavaOne, and Oracle OpenWorld Full Conference attendees, you'll be savoring the music of the world's hottest funk pop band, Black Eyed Peas, plus superstar rock legends Don Henley (of the Eagles) and Steve Miller. Save the date now: When: Wednesday, September 22, 8 p.m.­12 a.m. Where: Treasure Island, San Francisco Get all the details here!

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  • Outstanding SQL Saturday

    - by merrillaldrich
    I had the privilege to attend the SQL Saturday held in Redmond today, and it was really outstanding. Among the many sessions, I especially enjoyed and took a lot of useful information away from Greg Larsen’s Dynamic Management Views session, Kalen Delaney’s Compression Session – I am planning to implement 2008 Enterprise compression on my company’s data warehouse later this year – and Remus Rusanu’s session on Service Broker to process NAP data. I want to send out heartfelt thanks to the generous...(read more)

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  • Deploying Reports using the ReportingServices2005 Class and the RS Utility

    Much of the routine administration of Reporting Services (SSRS), such as the routine deployment of RDL reports, can be automated by using the Reporting Service 2005 class library and web services. To make things easier, Microsoft supply the RS utility to run Visual Basic code as a script. It is an intriguing system, with a lot of potential, as Greg Larsen explains.

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