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• MySQL Open Source Backup and Recovery Alternative: Xtrabackup

  MySQL database administrators are always looking for a solid backup and recovery tool that will suit all their needs. Xtrabackup, created by Percona, is the open source alternative to the commercial Innodb Hot Backup tool. This article explains a good methodology for testing and verifying Xtrabackups capabilities and precision.

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• MySQL Open Source Backup and Recovery Alternative: Xtrabackup

  MySQL database administrators are always looking for a solid backup and recovery tool that will suit all their needs. Xtrabackup, created by Percona, is the open source alternative to the commercial Innodb Hot Backup tool. This article explains a good methodology for testing and verifying Xtrabackups capabilities and precision.

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• Boost Your SEO With Good Keyword Research

  Once you get into the search engine optimization game, you'll learn all types of basic principles. Emphasizing your keyword in code is one. Stressing Your Keyword For SEO. Keywords are the key, pun supposed, to search engine optimization. You must develop an understanding of what your projections are wanting for in your space of business. Keyword research is the method for doing this and a step that should be conducted with nice precision and effort.

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• How to record both audio, Where i have one music running and my microphone is in use?

  - by YumYumYum

  I have one music playing, and i have microphone open, already the microphone is used by other application. In such case, how can i record that music and the microphone audio to a file? (if possible with command line). Follow up: $ rec new-file.wav Input File : 'default' (alsa) Channels : 2 Sample Rate : 48000 Precision : 16-bit Sample Encoding: 16-bit Signed Integer PCM In:0.00% 00:00:25.94 [00:00:00.00] Out:1.24M [ | ] Clip:0 ^C $ sox -d new-file.wav

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• Problems setting NTP sever with w32tm for a DC that is a Hyper-V guest

  - by R.Tonheim

  Hello ! I have tried to sett my DC to get its time from several NTP severs. I follow this answer (http://serverfault.com/questions/24298/w32time-sync-problems-for-hyper-v-guests-w32time-event-ids-38-24-29-35/24299#24299) to do it. First I disable Time Synchronization in the Hyper-V Integration Services for each guest. Then restart the Windows Time serviceon the guest. I had before this used this command: w32tm /config /manualpeerlist:"ntp.uio.no;timekeeper. uio.no;nissen.uio.no;0.no.pool.ntp.org;1.no.pool.ntp.org;2.no.pool.ntp.org" /syn cfromflags:manual /reliable:yes /update And the cmd sad: The command completed successfully. But the time was still 10 min wrong... I run w32tm again after restarted the DC without it having any effect. The w32tm /query /status still say: "Source: Local CMOS Clock" FROM MY CMD: Microsoft Windows [Version 6.0.6002] Copyright (c) 2006 Microsoft Corporation. All rights reserved. C:\Users\Administrator.MHGw32tm /query /status Leap Indicator: 0(no warning) Stratum: 1 (primary reference - syncd by radio clock) Precision: -6 (15.625ms per tick) Root Delay: 0.0000000s Root Dispersion: 10.0000000s ReferenceId: 0x4C4F434C (source name: "LOCL") Last Successful Sync Time: 05.09.2009 20:06:21 Source: Local CMOS Clock Poll Interval: 6 (64s) C:\Users\Administrator.MHGw32tm /config /manualpeerlist:"ntp.uio.no;timekeeper. uio.no;nissen.uio.no;0.no.pool.ntp.org;1.no.pool.ntp.org;2.no.pool.ntp.org" /syn cfromflags:manual /reliable:yes /update The command completed successfully. C:\Users\Administrator.MHGw32tm /query /status Leap Indicator: 0(no warning) Stratum: 1 (primary reference - syncd by radio clock) Precision: -6 (15.625ms per tick) Root Delay: 0.0000000s Root Dispersion: 10.0000000s ReferenceId: 0x4C4F434C (source name: "LOCL") Last Successful Sync Time: 05.09.2009 20:06:21 Source: Local CMOS Clock Poll Interval: 6 (64s) C:\Users\Administrator.MHG

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• ntpdate cannot receive data

  - by Hengjie

  I have a problem where running ntpdate on my server doesn't return any data therefore I get the following error: [root@server etc]# ntpdate -d -u -v time.nist.gov 12 Apr 01:10:09 ntpdate[32072]: ntpdate [email protected] Fri Nov 18 13:21:21 UTC 2011 (1) Looking for host time.nist.gov and service ntp host found : 24-56-178-141.co.warpdriveonline.com transmit(24.56.178.141) transmit(24.56.178.141) transmit(24.56.178.141) transmit(24.56.178.141) transmit(24.56.178.141) 24.56.178.141: Server dropped: no data server 24.56.178.141, port 123 stratum 0, precision 0, leap 00, trust 000 refid [24.56.178.141], delay 0.00000, dispersion 64.00000 transmitted 4, in filter 4 reference time: 00000000.00000000 Thu, Feb 7 2036 14:28:16.000 originate timestamp: 00000000.00000000 Thu, Feb 7 2036 14:28:16.000 transmit timestamp: d3303975.1311947c Thu, Apr 12 2012 1:10:13.074 filter delay: 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 filter offset: 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 delay 0.00000, dispersion 64.00000 offset 0.000000 12 Apr 01:10:14 ntpdate[32072]: no server suitable for synchronization found I have tried Googling the 'no server suitable for synchronization found' error online and I have tried disabling my firewall (running iptables -L returns no rules). I have also confirmed with my DC that there are no rules that are blocking ntp (port 123). Does anyone have any ideas on how I may fix this? Btw, this is what the output should look like on a working server in another DC: 11 Apr 19:01:24 ntpdate[725]: ntpdate [email protected] Fri Nov 18 13:21:17 UTC 2011 (1) Looking for host 184.105.192.247 and service ntp host found : 247.conarusp.net transmit(184.105.192.247) receive(184.105.192.247) transmit(184.105.192.247) receive(184.105.192.247) transmit(184.105.192.247) receive(184.105.192.247) transmit(184.105.192.247) receive(184.105.192.247) transmit(184.105.192.247) receive(184.105.192.247) transmit(184.105.192.247) server 184.105.192.247, port 123 stratum 2, precision -20, leap 00, trust 000 refid [184.105.192.247], delay 0.18044, dispersion 0.00006 transmitted 4, in filter 5 reference time: d330364e.e956694f Wed, Apr 11 2012 18:56:46.911 originate timestamp: d3303765.8702d025 Wed, Apr 11 2012 19:01:25.527 transmit timestamp: d3303765.73b213e3 Wed, Apr 11 2012 19:01:25.451 filter delay: 0.18069 0.18044 0.18045 0.18048 0.18048 0.00000 0.00000 0.00000 filter offset: -0.00195 -0.00197 -0.00211 -0.00202 -0.00202 0.000000 0.000000 0.000000 delay 0.18044, dispersion 0.00006 offset -0.001970

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• Importing long numerical identifiers into Excel

  - by Niels Basjes

  I have some data in a database that uses ids that have the form of 16 digit numbers. In some situations i need to export the data in such a way that it can be manipulated in excel. So i export the data into a file and import it into excel. I've tried several file formats and I'm stuck. The problem I'm facing is that when reading a file into excel that has a cell that looks like a number then excel treats it as a number. The catch is that (as far as i can tell) all numerical values in excel are double precision floating point which have a precision of less than 16 digits. So my ids are changed: very often the last digit its changed to a 0. So far I've only been able to convince excel to keep the Id unchanged by breaking it myself: by adding a letter or symbol to the Id. This however means that in order to use the value again it must be "unbroken". Is there a way to create a file where i can specify that excel must treat the value as a text without changing the value? Or its there a way to let excel treat the value as a long (64bit integer)?

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• iPhone StoreKit - invalid product id's

  - by Achim

  I'm trying to test the in App purchase within the sandbox environment. In order to test the code I a) created a In App Purchase Test User account under 'Manage Users' in iTunes Connect b) created some in app purchase products under 'Manage Your In App Purchases'. I used numeric values and alpha-numeric values for the Product ID's. c) Loaded the app onto the iPhone, went to Settings-Store and logged out of the regular store and into the under a) created test account d) set a breakpoint in the (void)productsRequest:(SKProductsRequest *)request didReceiveResponse:(SKProductsResponse *)response callback All the submitted Product ID's are in the response.invalidProductIdentifiers category. When submitting the request I use either the Product ID's used under b) directly or I tried to prefix them with the Bundle ID: NSString *id2 = @"com.super.duper.8"; NSSet *productList = [NSSet setWithObjects:id2, @"8", nil]; SKProductsRequest *request= [[SKProductsRequest alloc] initWithProductIdentifiers:productList]; Am I missing something obvious? Any help is appreciated. Achim

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• DataAnnotations Automatic Handling of int is Causing a Roadblock

  - by DM

  Summary: DataAnnotation's automatic handling of an "int?" is making me rethink using them at all. Maybe I'm missing something and an easy fix but I can't get DataAnnotations to cooperate. I have a public property with my own custom validation attribute: [MustBeNumeric(ErrorMessage = "Must be a number")] public int? Weight { get; set; } The point of the custom validation attribute is do a quick check to see if the input is numeric and display an appropriate error message. The problem is that when DataAnnotations tries to bind a string to the int? is automatically doesn't validate and displays a "The value 'asdf' is not valid for Weight." For the life of me I can't get DataAnnotations to stop handling that so I can take care of it in my custom attribute. This seems like it would be a popular scenario (to validate that the input in numeric) and I'm guessing there's an easy solution but I didn't find it anywhere.

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• Using numeric_limits::max() in constant expressions

  - by FireAphis

  Hello, I would like to define inside a class a constant which value is the maximum possible int. Something like this: class A { ... static const int ERROR_VALUE = std::numeric_limits<int>::max(); ... } This declaration fails to compile with the following message: numeric.cpp:8: error: 'std::numeric_limits::max()' cannot appear in a constant-expression numeric.cpp:8: error: a function call cannot appear in a constant-expression I understand why this doesn't work, but two things look weird to me: It seems to me a natural decision to use the value in constant expressions. Why did the language designers decide to make max() a function thus not allowing this usage? The spec claims in 18.2.1 that For all members declared static const in the numeric_limits template, specializations shall define these values in such a way that they are usable as integral constant expressions. Doesn't it mean that I should be able to use it in my scenario and doesn't it contradict the error message? Thank you.

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• Sub-query problem on Oracle 10g

  - by Eric

  The following query works on Oracle 10.2.0.1.0 on windows,but doesn't work on Oracle 10.2.0.2.0 on Linux. What's the problem?How can I make it work? Thanks! CREATE TABLE AUDITHISTORY( CASENUM numeric(20, 0) NOT NULL, AUDIT_DATE date NOT NULL, USER_NAME varchar(255) NULL, AUDIT_USECS numeric(6, 0) NOT NULL ) Query: SELECT T.CASENUM, T.USER_NAME, T.AUDIT_DATE AS STARTED, (SELECT * FROM (SELECT S.AUDIT_DATE FROM AUDITHISTORY S WHERE S.CASENUM=T.CASENUM AND S.USER_NAME=T.USER_NAME AND (S.AUDIT_DATE > T.AUDIT_DATE OR (S.AUDIT_DATE = T.AUDIT_DATE AND S.AUDIT_USECS > T.AUDIT_USECS)) ORDER BY S.AUDIT_DATE ASC,S.AUDIT_USECS ASC ) WHERE rownum <= 1) AS ENDED FROM AUDITHISTORY T BANNER Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Prod PL/SQL Release 10.2.0.1.0 - Production CORE 10.2.0.1.0 Production TNS for 32-bit Windows: Version 10.2.0.1.0 - Production NLSRTL Version 10.2.0.1.0 - Production BANNER Oracle Database 10g Enterprise Edition Release 10.2.0.2.0 - Prod PL/SQL Release 10.2.0.2.0 - Production CORE 10.2.0.2.0 Production TNS for Linux: Version 10.2.0.2.0 - Production NLSRTL Version 10.2.0.2.0 - Production

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• Have problems designing input and output for a calculator app

  - by zoul

  Hello! I am writing a button calculator. I have the code split into model, view and a controller. The model knows nothing about formatting, it is only concerned with numbers. All formatting is done in the view. The model gets its input as keypresses, each keypress is a part of an enum: typedef enum { kButtonUnknown = 0, kButtonMemoryClear = 100, kButtonMemoryPlus = 112, kButtonMemoryMinus = 109, kButtonMemoryRecall = 114, kButtonClear = 99, … }; When the user presses a button (say 1), the model receives a button code (kButtonNum1), adds the corresponding number to a string input buffer ("1") and updates the numeric output value (1.0). The controller then passes the numeric output value to the view that formats it (1). This is all plain, simple and clean, but does not really work. The problem is that when user enters a part of a number (say 0.00, going to enter 0.001), the input does not survive the way through model to view and the display says 0 instead of 0.00. I know why this happens ("0.00"::string parses to 0::double and that gets formatted as 0). What I don’t know is how to design the calculator so that the code stays clean and simple and the numbers will show up on screen exactly as the user types them. I’ve already come with some kind of solution, but that’s essentially a hack and breaks the beautiful and simple flow from the calculator model to the display. Ideas? Current solution keeps track of the calculator state. If the calculator is building a number, I take the calculator input buffer (a string) and directly set the display contents (also a string). Otherwise I take the proper path, ie. take the numeric calculator output, pass it to the view as a double and the view uses its internal formatter to create a string for the display. Example input: input | display | mode ------+---------+------------ 0 | 0 | from string 0. | 0. | from string 0.0 | 0.0 | from string 0.0+ | 0 | from number This is ugly. (1) The calculator has to expose its input buffer and state. (2) The view has to expose its display and allow setting its contents directly using a string. (3) I have to duplicate some of the formatting code to format the string I got from the calculator input buffer. If user enters 12345.000, I have to display 12,345.000 and therefore I’ve got to have a commification code for strings. Yuck.

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• Lack of IsNumeric function in C#

  - by Michael Kniskern

  One thing that has bothered me about C# since its release was the lack of a generic IsNumeric function. I know it is difficult to generate a one-stop solution to detrmine if a value is numeric. I have used the following solution in the past, but it is not the best practice because I am generating an exception to determine if the value is IsNumeric: public bool IsNumeric(string input) { try { int.Parse(input); return true; } catch { return false; } } Is this still the best way to approach this problem or is there a more efficient way to determine if a value is numeric in C#?

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• ModalPopUp NumericUpDownExtender Problem

  - by ram

  My Code is: Here, modal popup was not showing my numeric updown extender, i dont know what was the issue here.

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• Reported error code considered SQL Injection?

  - by inquam

  SQL injection that actually runs a SQL command is one thing. But injecting data that doesn't actually run a harmful query but that might tell you something valuable about the database, is that considered SQL injection? Or is it just used as part to construct a valid SQL injection? An example could be set rs = conn.execute("select headline from pressReleases where categoryID = " & cdbl(request("id")) ) Passing this a string that could not be turned into a numeric value would cause Microsoft VBScript runtime error '800a000d' Type mismatch: 'cdbl' which would tell you that the column in question only accepts numeric data and is thus probably of type integer or similar. I seem to find this in a lot of pages discussing SQL injection, but don't really get an answer if this in itself is considered SQL injection. The reason for my question is that I have a scanning tool that report a SQL injection vulnerability and reports a VBScript runtime error '800a000d' as the reason for the finding.

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• how to change label size dynamically using numericupdown in C#

  - by sama

  I want to know how to change label size using current value in numeric up-down list using C#

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• How to read a file with variable multi-row data in Python

  - by dr.bunsen

  I have a file that is about 100Mb that looks like this: #meta data 1 skadjflaskdjfasljdfalskdjfl sdkfjhasdlkgjhsdlkjghlaskdj asdhfk #meta data 2 jflaksdjflaksjdflkjasdlfjas ldaksjflkdsajlkdfj #meta data 3 alsdkjflasdjkfglalaskdjf This file contains one row of meta data that corresponds to several, variable length data containing only alpha-numeric characters. What is the best way to read this data into a simple list like this: data = [[#meta data 1, skadjflaskdjfasljdfalskdjflsdkfjhasdlkgjhsdlkjghlaskdjasdhfk], [#meta data 2, jflaksdjflaksjdflkjasdlfjasldaksjflkdsajlkdfj], [#meta data 3, alsdkjflasdjkfglalaskdjf]] My initial idea was to use the read() method to read the whole file into memory and then use regular expressions to parse the data into the desired format. Is there a better more pythonic way? All metadata lines start with an octothorpe and all data lines are all alpha-numeric. Thanks!

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• What to beware of reading old Numarray tutorials and examples?

  - by DarenW

  Python currently uses Numpy for heavy duty math and image processing. The earlier Numeric and Numarray are obsolete, but still today there are many tutorials, notes, sample code and other documentation using them. Some of these cover special topics of interest, some are well written but haven't been updated or replaced, or are otherwise of use. Quite a bit is the same between Numeric, Numarray and Numpy, so I usually get good mileage out these older docs. Ocassionaly, though, I run into a line of code that results in error. Not often enough to remember how to get around it, but usually I figure it out at the cost of some time. What are the main things to watch out for when relying on such older documentation for current Numpy use? Is there a list of how to translate the differences that exist?

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• Code Golf: Ghost Leg

  - by Anax

  The challenge The shortest code by character count that will output the numeric solution, given a number and a valid string pattern, using the Ghost Leg method. Examples Input: 3, "| | | | | | | | |-| |=| | | | | |-| | |-| |=| | | |-| |-| | |-|" Output: 2 Input: 2, "| | |=| | |-| |-| | | |-| | |" Output: 1 Clarifications Do not bother with input. Consider the values as given somewhere else. Both input values are valid: the column number corresponds to an existing column and the pattern only contains the symbols |, -, = (and [space], [LF]). Also, two adjacent columns cannot both contain dashes (in the same line). The dimensions of the pattern are unknown (min 1x1). Clarifications #2 There are two invalid patterns: |-|-| and |=|=| which create ambiguity. The given input string will never contain those. The input variables are the same for all; a numeric value and a string representing the pattern. Entrants must produce a function. Test case Given pattern: "|-| |=|-|=|LF| |-| | |-|LF|=| |-| | |LF| | |-|=|-|" |-| |=|-|=| | |-| | |-| |=| |-| | | | | |-|=|-| Given value : Expected result 1 : 6 2 : 1 3 : 3 4 : 6 5 : 5 6 : 2

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• Can a regex return a match that's not a part of the original string?

  - by Vishnu

  I'm using an application that requires me to provide a regex for various files. It uses the matches from the regex to uniquely identify each file and then use a data store to retrieve metadata about these files. there is however a problem with the application, so it assumes that the data which is used to identify each file is only numeric data. Hence, it stores the results of matches in integers. I control the data store but not the names of the files. Since the application has a bug in it, I was hoping that I could use an encoding scheme to convert the non-numeric data to an integer. But for that I'd require the regex to return something that's not part of the original string as a match. Is this possible?

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• Regular Expression - Password Validation is not working

  - by Kesavan

  Hi, I have to validate the password using regex. The password rule is like at least 1 uppercase and at least 2 numeric. It works fine except if the character comes at the end of the string. The regular expression which i am using is "^(?=.*\d.{2})(?=.*[A-Z].{1})(?=.*[@#$%^&+=].{2}).{8,12}$" Rules: minimum length = 8 minimum uppercase = 1 minimum numeric = 2 minimum special character = 1 It works for Test123$$, Test$123, TEST123$s, Test123$1, Test12$3 but it fails if the character specified comes at the end of the string like Test123$, Test$a12, Test12aa@, 123aa@@T. Please let me know if there is any fix for this.

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• Getting the value from an array in the model in rails

  - by slythic

  Hi all, I have a relatively simple problem. I have a model named Item which I've added a status field. The status field will only have two options (Lost or Found). So I created the following array in my Item model: STATUS = [ [1, "Lost"], [2, "Found"]] In my form view I added the following code which works great: <%= collection_select :item, :status, Item::STATUS, :first, :last, {:include_blank => 'Select status'} %> This stores the numeric id (1 or 2) of the status in the database. However, in my show view I can't figure out how to convert from the numeric id (again, 1 or 2) to the text equivalent of Lost or Found. Any ideas on how to get this to work? Is there a better way to go about this? Many thanks, Tony

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• Form graphics not set when form loads

  - by Jimmy

  My form has a group box which contains two overlapping rectangles. The form's other controls are two sets of four numeric up down controls to set the rectangles' colors. (nudF1,2,3 and 4 set the rectangle that's in front, and nudB1,2,3 and 4 set the rectangle that's behind.) Everything works fine, except that the rectangles do not display the colors set in the numeric up downs when the form first loads. The numeric up down controls' ChangeValue events all call the ShowColors() method. The form's Load event calls the csColorsForm_Load() method. Any suggestions? namespace csColors { public partial class csColorsForm : Form { public csColorsForm() { InitializeComponent(); } private void csColorsForm_Load(object sender, EventArgs e) { this.BackColor = System.Drawing.Color.DarkBlue; SetColors(sender, e); } private void SetColors(object sender, EventArgs e) { Control control = (Control)sender; String ctrlName = control.Name; Graphics objGraphics; Rectangle rect1, rect2; int colorBack, colorFore; objGraphics = this.grpColor.CreateGraphics(); // If calling control is not a forecolor control, paint backcolor rectangle if (ctrlName.Substring(0,4)!="nudF") { colorBack = int.Parse(SetColorsB("nudB"), NumberStyles.HexNumber); SolidBrush BrushB = new SolidBrush(Color.FromArgb(colorBack)); rect1 = new Rectangle(this.grpColor.Left, this.grpColor.Top, this.grpColor.Width, this.grpColor.Height); objGraphics.FillRectangle(BrushB, rect1); } // Always paint forecolor rectangle colorFore = int.Parse(SetColorsB("nudF"), NumberStyles.HexNumber); SolidBrush BrushF = new SolidBrush(Color.FromArgb(colorFore)); rect2 = new Rectangle(this.grpColor.Left, this.grpColor.Top, this.grpColor.Width, this.grpColor.Height); objGraphics.FillRectangle(BrushF, rect2); objGraphics.Dispose(); } private string SetColorsB(string nam) { string txt=""; for (int n = 1; n <= 4; ++n) { var ud = Controls[nam + n] as NumericUpDown; int hex = (int)ud.Value; txt += hex.ToString("X2"); } return txt; } private void btnClose_Click(object sender, EventArgs e) { this.Close(); } } }

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• How do I use an enum with custom values for a Sharepoint Web part?

  - by Jeff

  I'm trying to design a Web Part that has a drop-down list for the user to choose from. Eventually, these values will be automatically generated based on some kind of outside data source, so they're going to have somewhat arbitrary numeric values associated with them. This is the code I have now: public enum filterChoice { All=0, BOCC=12, Sustainability=15, Clerk=4, DA=13, Emergency=7, Highlights=3, POS=6, PR=1, PH=5, SHPR=2, Test=8, Transportation=14, Volunteer=16 }; These are different categories I want the user to choose from. When I choose one and save the settings for my Web Part, Sharepoint is only saving the values in numeric order; that is, All=0, BOCC=1, Sustainability=3 [...] so my Web Part then thinks the user chose the value with the corresponding number (PR when they chose BOCC, Highlights when they chose Sustainability, etc.) How can I make Sharepoint honor my custom values?

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• How to use the boost lexical_cast library for just for checking input

  - by Inverse

  I use the boost lexical_cast library for parsing text data into numeric values quite often. In several situations however, I only need to check if values are numeric; I don't actually need or use the conversion. So, I was thinking about writing a simple function to test if a string is a double: template<typename T> bool is_double(const T& s) { try { boost::lexical_cast<double>(s); return true; } catch (...) { return false; } } My question is, are there any optimizing compilers that would drop out the lexical_cast here since I never actually use the value? Is there a better technique to use the lexical_cast library to perform input checking?

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