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• Multiple ports listed in SQL Server connection string

  - by BBlake

  I have a legacy VB6 app where the servername, databasename, username, etc are defined in an INI file, but the port number for the connection string (the default 1433) is hard coded in the app. It's being moved to a new sql server back end that runs off a different port number. I'm trying to avoid having to alter and recompile the application which entails signifigant retesting, documentation, etc. I tried altering the INI file so that for the new server I have put in: SERVERNAME\INSTANCE,NEWPORTNUMBER This effectively builds the connection with Data Source = SERVERNAME\INSTANCE,NEWPORTNUMBER,1433; This appears to work correctly as it connects to the database when I run the app. It appears to me that the ,1433 portion is being ignored. Is this a valid assumption or will this cause me some problem I'm not seeing here?

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• The connection was reset

  - by jabberbuzz

  "The connection to the server was reset while the page was loading." Hi, I am trying to load a php page on apache , but none of the static content gets loaded. Using firebug I captured the static url and tried it separately, when I received "The connection was reset" message. The site works other computers mac, windows, linux but no on mine. I have deleted the cache, disabled firewall, changed my dns service and followed every possible suggestion on the web. I have no clue on why this is happening. Stack-overflow has been my bible and has never let me down before, hope it still doesn't ... Thanks a lot in advance .... please please please , i really have to figure out this error. Regards Dilip

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• Passing extended parameter into Sql 2008 connection string

  - by Pita.O

  Hi, I have a need to support extensive auditing capabilities for a system backing into Sql Server 2008. Since I plan to use LINQ (with no Stored Procs), the database would be a clean, zero contact data repository. However, I need to pratically record a snapshot of every change that happens in the db. So, I thought I should use triggers. But then, I need a user id for the particular user (not the connection string user id) to flow through into the database. In oracle, I should have been able to set up a PROXY USER and the trigger would be able to pick that up. Last I checked, there was no proxy user concept in Sql Server. Does anyone know if there's any extender property I can use to flow through my authenticated user name? ps: I don't mind the impact on connection pooling (if any). Thanks. P

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• Geeting internal Oracle connection from Hibernate in JBoss

  - by espressoshot

  Hello, I need to set an application context through Hibernate. I found there is a method setApplicationContext on oracle.jdbc.internal.OracleConnection. I wrote a test, in which I was getting the Oracle connection from the Hibernate session and it worked fine. However, when I moved the code to my application running under JBoss where connections are obtained from the pool the solution won't work. The error is: $Proxy51 cannot be cast to oracle.jdbc.internal.OracleConnection. (1) How can I get the internal connection in that environment? (2) Is there a better way to set an application context through Hibernate (docs don't say anything about it). Thanks so much. Kris

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• .NET Compact Framework Connection String encryption/securing

  - by Crazydog

  I'm writing an application in C# for a smart device running Windows Mobile 6.1. It's pretty basic. Just querying a database and getting results. Nothing too fancy. This program is only going to be deployed internally, but we still want to be secure with our SQL connection info. What's the best way I should go about encrypting/securing my connection string in the program? I've seen examples for .NET programs using AppSettings, but I'm not seeing a Setting stab in my Solution properties. This is my first time developing an application in C#/Visual Studio 2008, so there might be some kind of setting I'm missing. Thanks for the help.

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• SQL Compact 2008 Connection String Problem

  - by Seth

  I have the following code to connect to a sql server compact edition 2008: private SqlConnection sqlConn; public void createConnection() { String connectionString = @"Data Source=C:\Projects\somefile.sdf;Persist Security Info=False"; sqlConn = new SqlConnection(connectionString); sqlConn.Open(); } However, I keep getting the following error when sqlConn.Open() is executed: "A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified)" Does anyone have any ideas what the problem might be? I can create a connection to the db in the database explorer but it doesn't seem to work in code.

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• Windows Azure Mobil Services first connection in Android

  - by egente

  my application based windows azure mobil services. Application connecting time is well normally but when login to application first time azure mobile services connection is very slow like 10 second, after connection speed is normally. how can i solve this problem? my codes; private MobileServiceClient mClient; private MobileServiceTable<products> mProductsTable; mClient = new MobileServiceClient( "https://example.azure-mobile.net/", "aaaaaaaaaaaaaaaaaaaaaaaa", this).withFilter(new ProgressFilter());; mProductsTable = mClient.getTable(products.class); mProductsTable.where() .execute(new TableQueryCallback<products>() { public void onCompleted(List<products> result, int count, Exception exception, ServiceFilterResponse response) { if (exception == null) { } else{ Toast.makeText(Product.this, "Ops!!! Error.", 1000).show(); }} });

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• VSTO 3.0 Get/Change an excel 2007 workbook connection

  - by RQueiroga

  Hi all, I've struggling to find a way to get and change and excel 2007 workbook connection (Menu Data - Existing Connections - Connections on this Workbook).It's a connection (several actually) to a SQL Server and used in a pivot table. I've tried using Application.ActiveWorkbook.Connections or Globals.ThisWorkbook.Connections but they both return always Null..I've tried in an sheet event as well as in a custom ribbon's button event as well. The only way left I can think of is use to code a VBA method that does the work and then invoque it in my VSTO code, but it's not very elegant is it... Thanks in advanced :-)

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• PPTP VPN connects via NM but goes down during SSH connection

  - by Andrea Olivato

  I setup a VPN PPTP connection via network manager and it connects correctly (I see the lock near the notification icon and the message "Vpn connection has been successfully...") As soon as I try to perform any SSH connection via the established tunnel the connection itself goes down with the message "Vpn connection failed". the SSH connection always fails at debug1: SSH2_MSG_KEXINIT sent I've looked into the system logs and this is the log Dec 12 12:25:00 ushuaia NetworkManager[1155]: <info> Starting VPN service 'pptp'... Dec 12 12:25:00 ushuaia NetworkManager[1155]: <info> VPN service 'pptp' started (org.freedesktop.NetworkManager.pptp), PID 7093 Dec 12 12:25:00 ushuaia NetworkManager[1155]: <info> VPN service 'pptp' appeared; activating connections Dec 12 12:25:00 ushuaia NetworkManager[1155]: <info> VPN plugin state changed: init (1) Dec 12 12:25:00 ushuaia NetworkManager[1155]: <info> VPN plugin state changed: starting (3) Dec 12 12:25:00 ushuaia NetworkManager[1155]: <info> VPN connection 'Redation' (Connect) reply received. Dec 12 12:25:05 ushuaia NetworkManager[1155]: <info> VPN connection 'Redation' (IP4 Config Get) reply received from old-style plugin. Dec 12 12:25:05 ushuaia NetworkManager[1155]: <info> VPN Gateway: 5.98.141.210 Dec 12 12:25:06 ushuaia NetworkManager[1155]: <info> VPN connection 'Redation' (IP Config Get) complete. Dec 12 12:25:06 ushuaia NetworkManager[1155]: <info> VPN plugin state changed: started (4) Dec 12 12:25:14 ushuaia NetworkManager[1155]: <info> VPN plugin state changed: stopping (5) Dec 12 12:25:14 ushuaia NetworkManager[1155]: <info> VPN plugin state changed: stopped (6) Dec 12 12:25:14 ushuaia NetworkManager[1155]: <info> VPN plugin state change reason: 0 Dec 12 12:25:15 ushuaia NetworkManager[1155]: <warn> error disconnecting VPN: Could not process the request because no VPN connection was active. Dec 12 12:25:20 ushuaia NetworkManager[1155]: <info> VPN service 'pptp' disappeared Please note that the same vpn is configured on my colleagues Windows 7 and works without problem when they use putty to connect via SSH

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• SQL Server Integration Services Connection Manager Tips and Tricks

  In this article, we will take a look at the following Tips and Tricks for Connection Managers: Adding an "Application Name" property to the connection string; Creating Two Connection Managers for each Database Connection; and Capturing Connection Manager details in Package Configurations Deployment Manager 2 is now free!The new version includes tons of new features and we've launched a completely free Starter Edition! Get Deployment Manager here

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• how to know which standard does my Wi-Fi Connection using currently

  - by idgar

  My laptop has capabilities of 802.11n connection. with my previous router i could connect with more than 54Mb connection. now i have D-Link router and for some reason the maximum connection speed is 54Mb, which implying that the connection has established with 802.11g. how can i check which standard (g or n) has been established? is there any command that get that information? (nm-applet does not give any information about that at the connection information window).

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• Hows does Drupal 6 interact with MySQL for connections and transactions?

  - by Mike Munroe

  Hows does Drupal 6 interact with MySQL for connections and transactions? Does connection pooling get used? How are transactions handled? At what level are these things managed by Drupal vs being handed off to be handled by MySQL? I did a good amount of searching on the web and within Stack Overflow, but mainly, I only found articles for tweaking Drupal performance and scaling needs.

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• Server hard disk read speed and client download speed, is there a connection? [closed]

  - by Mywiki Witwiki

  Ok so a client's download speed is only as fast as a server's upload speed, and vice versa. Based on the answers to this post: Does upload speed depend upon download speed of the server? In other words, the data transfer rate between the two computers is only as fast as the speed of the "bottleneck". Let's pretend the two computers are in two different networks and both have 100Mbps internet connection. Ben wants a copy of a file in Mark's computer hard disk with 30Mbps read speed. Does this mean that Ben can download the file at a speed of around 30Mbps only, despite having an internet connection faster than 30Mbps?

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• Rebol MSAccess ODBC: works with DNS connection but not with DNSLess Connection

  - by Rebol Tutorial

  I have tested the new free Rebol ODBC with MS Access after reading the doc here http://www.rebol.com/docs/database.html It works with ODBC DNS connection but when I tested with this DNSLess connection (MSAccess2003 file with MSAccess2007 installed): connect-name: open [ scheme: 'odbc target: join "{DRIVER=Microsoft Access Driver (*.mdb)}; " "DBQ=c:\test\test.mdb" ] It shows this error: >> connect-name: open [ [ scheme: 'odbc [ target: join "{DRIVER=Microsoft Access Driver (*.mdb)}; " [ "DBQ=c:\test\test.mdb" [ ] ** Access Error: Invalid port spec: scheme odbc target join {DRIVER=Microsoft Access Driver (*.mdb)}; DBQ=c:\test\test.mdb ** Near: connect-name: open [ scheme: 'odbc target: join "{DRIVER=Microsoft Access Driver (*.mdb)}; " "DBQ=c:\test\... >> >> Do you know why ? Thanks.

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• C# serialPort speed

  - by MarekK

  Hi I am developing some monitoring tool for some kind of protocol based on serial communication. Serial BaudRate=187,5kb I use System.IO.Ports.SerialPort class. This protocol has 4 kinds of frames. They have 1Byte,3Bytes,6Bytes, 10-255Bytes. I can work with them but I receive them too late to respond. For the beginning I receive first packed after ex. 96ms (too late), and it contains about 1000B. This means 20-50 frames (too much, too late). Later its work more stable, 3-10Bytes but it is still too late because it contains 1-2 frames. Of Course 1 frame is OK, but 2 is too late. Can you point me how can I deal with it more reliable? I know it is possible. Revision1: I tried straight way: private void serialPort1_DataReceived(object sender, SerialDataReceivedEventArgs e) { if (!serialPort1.IsOpen) return; this.BeginInvoke(new EventHandler(this.DataReceived)); } And Backgroud worker: And ... new Tread(Read) and... always the same. Too late, too slow. Do I have to go back to WinApi and import some kernel32.dll functions? Revision 2: this is the part of code use in the Treading way: int c = serialPort1.BytesToRead; byte[] b = new byte[c]; serialPort1.Read(b, 0, c); I guess it is some problem with stream use inside SerialPort class. Or some synchronization problem. Revision 3: I do not use both at once!! I just tried different ways. Regards MarekK

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• Speed boost to adjacency matrix

  - by samoz

  I currently have an algorithm that operates on an adjacency matrix of size n by m. In my algorithm, I need to zero out entire rows or columns at a time. My implementation is currently O(m) or O(n) depending on if it's a column or row. Is there any way to zero out a column or row in O(1) time?

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• Speed of CSS

  - by Ólafur Waage

  This is just a question to help me understand CSS rendering better. Lets say we have a million lines of this. <div class="first"> <div class="second"> <span class="third">Hello World</span> </div> </div> Which would be the fastest way to change the font of Hello World to red? .third { color: red; } div.third { color: red; } div.second div.third { color: red; } div.first div.second div.third { color: red; } Also, what if there was at tag in the middle that had a unique id of "foo". Which one of the CSS methods above would be the fastest. I know why these methods are used etc, im just trying to grasp better the rendering technique of the browsers and i have no idea how to make a test that times it. UPDATE: Nice answer Gumbo. From the looks of it then it would be quicker in a regular site to do the full definition of a tag. Since it finds the parents and narrows the search for every parent found. That could be bad in the sense you'd have a pretty large CSS file though.

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• std::vector iterator or index access speed question

  - by Simone Margaritelli

  Just a stupid question . I have a std::vector<SomeClass *> v; in my code and i need to access its elements very often in the program, looping them forward and backward . Which is the fastest access type between those two ? Iterator access std::vector<SomeClass *> v; std::vector<SomeClass *>::iterator i; std::vector<SomeClass *>::reverse_iterator j; // i loops forward, j loops backward for( i = v.begin(), j = v.rbegin(); i != v.end() && j != v.rend(); i++, j++ ){ // some operations on v items } Subscript access (by index) std::vector<SomeClass *> v; unsigned int i, j, size = v.size(); // i loops forward, j loops backward for( i = 0, j = size - 1; i < size && j >= 0; i++, j-- ){ // some operations on v items } And, does const_iterator offer a faster way to access vector elements in case i do not have to modify them? Thank you in advantage.

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• Understanding memory and cpu speed

  - by tipu

  Firstly, I am working on a windows xp 64 machine with 4gb ram and 2.29 ghz x4 I am indexing 220,000 lines of text that are more or less the same length. These are divided into 15 equally sized files. File 1/15 takes 1 minute to index. As the script indexes more files, it seems to take much longer with file 15/15 taking 40 minutes. My understanding is that the more I put in memory, the faster the script is. The dictionary is indexed in a hash, so fetch operations should be O(1). I am not sure where the script would be hanging the CPU. I have the script here.

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• php string versus boolean speed test

  - by ae

  I'm looking at trying to optimise a particular function in a php app and foolishly assumed that a boolean lookup in a 'if' statement would be quicker than a string compare. But to check it I put together a short test (see below). To my surprise, the string lookup was quicker. Is there anything wrong with my test (I'm wired on too much coffee so I'm suspicious of my own code)? If not, I would be interested in any comments people have around string versus boolean lookups in php. The result for the first test (boolean lookup) was 0.168 The result for the second test (string lookup) was 0.005 <?php $how_many = 1000000; $counter1 = 0; $counter2 = 0; $abc = array('boolean_lookup'=>TRUE, 'string_lookup'=>'something_else'); $start = microtime(); for($i = 0; $i < $how_many; $i++) { if($abc['boolean_lookup']) { $counter1++; } } echo ($start - microtime()); echo '<hr>'; $start = microtime(); for($i = 0; $i < $how_many; $i++) { if($abc['string_lookup'] == 'something_else') { $counter2++; } } echo ($start - microtime());

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• Cython Speed Boost vs. Usability

  - by zubin71

  I just came across Cython, while I was looking out for ways to optimize Python code. I read various posts on stackoverflow, the python wiki and read the article "General Rules for Optimization". Cython is something which grasps my interest the most; instead of writing C-code for yourself, you can choose to have other datatypes in your python code itself. Here is a silly test i tried, #!/usr/bin/python # test.pyx def test(value): for i in xrange(value): i**2 if(i==1000000): print i test(10000001) $ time python test.pyx real 0m16.774s user 0m16.745s sys 0m0.024s $ time cython test.pyx real 0m0.513s user 0m0.196s sys 0m0.052s Now, honestly, i`m dumbfounded. The code which I have used here is pure python code, and all I have changed is the interpreter. In this case, if cython is this good, then why do people still use the traditional Python interpretor? Are there any reliability issues for Cython?

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• Optimizing for speed - 4 dimensional array lookup in C

  - by Tiago

  I have a fitness function that is scoring the values on an int array based on data that lies on a 4D array. The profiler says this function is using 80% of CPU time (it needs to be called several million times). I can't seem to optimize it further (if it's even possible). Here is the function: unsigned int lookup_array[26][26][26][26]; /* lookup_array is a global variable */ unsigned int get_i_score(unsigned int *input) { register unsigned int i, score = 0; for(i = len - 3; i--; ) score += lookup_array[input[i]][input[i + 1]][input[i + 2]][input[i + 3]]; return(score) } I've tried to flatten the array to a single dimension but there was no improvement in performance. This is running on an IA32 CPU. Any CPU specific optimizations are also helpful. Thanks

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• Comparisons of web programming languages (on speed, etc.)

  - by Dave

  I'm looking for a site / report / something that can compares "identical" programs (programs that do the same thing) in different web-programming languages and then compares the speeds of each of them. I agree that there will be MANY MANY criteria on which this information can be sliced and diced by, but has anyone done any real comparison of this? I am interested in web-based languages only, ie php, perl, C, C++, java, asp, asp.net, etc.

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• speed string search in PHP

  - by Marc

  Hi! I have a 1.2GB file that contains a one line string. What I need is to search the entire file to find the position of an another string (currently I have a list of strings to search). The way what I'm doing it now is opening the big file and move a pointer throught 4Kb blocks, then moving the pointer X positions back in the file and get 4Kb more. My problem is that a bigger string to search, a bigger time he take to got it. Can you give me some ideas to optimize the script to get better search times? this is my implementation: function busca($inici){ $limit = 4096; $big_one = fopen('big_one.txt','r'); $options = fopen('options.txt','r'); while(!feof($options)){ $search = trim(fgets($options)); $retro = strlen($search);//maybe setting this position absolute? (like 12 or 15) $punter = 0; while(!feof($big_one)){ $ara = fgets($big_one,$limit); $pos = strpos($ara,$search); $ok_pos = $pos + $punter; if($pos !== false){ echo "$pos - $punter - $search : $ok_pos <br>"; break; } $punter += $limit - $retro; fseek($big_one,$punter); } fseek($big_one,0); } } Thanks in advance!

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• Script Speed vs Memory Usage

  - by Doug Neiner

  I am working on an image generation script in PHP and have gotten it working two ways. One way is slow but uses a limited amount of memory, the second is much faster, but uses 6x the memory . There is no leakage in either script (as far as I can tell). In a limited benchmark, here is how they performed: -------------------------------------------- METHOD | TOTAL TIME | PEAK MEMORY | IMAGES -------------------------------------------- One | 65.626 | 540,036 | 200 Two | 20.207 | 3,269,600 | 200 -------------------------------------------- And here is the average of the previous numbers (if you don't want to do your own math): -------------------------------------------- METHOD | TOTAL TIME | PEAK MEMORY | IMAGES -------------------------------------------- One | 0.328 | 540,036 | 1 Two | 0.101 | 3,269,600 | 1 -------------------------------------------- Which method should I use and why? I anticipate this being used by a high volume of users, with each user making 10-20 requests to this script during a normal visit. I am leaning toward the faster method because though it uses more memory, it is for a 1/3 of the time and would reduce the number of concurrent requests.

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