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• Hash Join require Full Table Scan

  - by Pedro Magalhaes

  So, I want to know if to make a Hash Join between two tables is necessary to make a full table scan on the collumns? If i want to join COL1 wiht COL2, and COL1 is smaller, the It makes a full scan in COL1 creating a Hashmap then makes a full scan in COL2 using the sabe hash function. Is this correct?

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• Compression File

  - by Pedro Magalhaes

  Hi, I have a X bytes file. And I want to compress it in block of size 32Kb, for example. Is there any lib that Can I do this? I used Zlib for Delphi but I just can compress a full file in new compressed file. Tranks a lot, Pedro

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• Producer / Consumer - I/O Disk

  - by Pedro Magalhaes

  Hi, I have a compressed file in the disk, that a partitioned in blocks. I read a block from disk decompress it to memory and the read the data. It is possible to create a producer/consumer, one thread that recovers compacted blocks from disk and put in a queue and another thread that decompress and read the data? Will the performance be better? Thanks!

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• Execuitng script in threads

  - by Pedro Magalhaes

  Hi. I wanna make an app that executes remote scripts. I am going to design it like a Windows Service that listen on tcp/ip port. Every new request I will execute a python scripts. So I can handle any number of tcp/ip request at same time, so I will need to execute python script in separate threads. How can I do that? Is that simple? The script will share some objects, like Log files(text files) and other modules. In the log file example every script will write in the same file. So the app (windows service) will be responsible for do that. I need to make this objects thread safe, right?

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• Compression Array of Bytes

  - by Pedro Magalhaes

  Hi, My problem is: I want to store a array of bytes in compressed file, and then I want to read it with a good performance. So I create a array of bytes then pass to a ZLIB algorithm then store it in the file. For my surprise the algorithm doesn't work well., probably because the array is a random sample. Using this approach, it will will be ber easy to read. Just copy the stream to memory, decompress them and copy it to a array of bytes. But i need to compress the file. Do I have to use a algorithm, like RLE, for compresse the byte array? I think that I can store the byte array like a string and then compress it. But i think I am going to have a poor performance on reading data. Sorry for my poor english. Thanks

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• La NSA aurait espionné l'ancien président mexicain, le gouvernement demande des explications à Washington

  La NSA aurait espionné l'ancien président mexicain, le gouvernement demande des explications à Washington Le quotidien allemand Der Spiegel a révélé que la NSA aurait réussi il y a quelques années à pirater le serveur de messagerie du gouvernement mexicain et d'accéder entre autres aux courriels de l'ancien président Felipe Calderon ainsi qu'à ceux de plusieurs collaborateurs de son cabinet. L'agence de renseignements aurait alors eu connaissance d'informations liées à la diplomatie, à l'économie...

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• Bugzilla 3.6 with Netbeans 6.8

  - by Miguel Ribeiro

  When I tried to configure bugzilla with netbeans 6.8 a msg told that the bugzilla's version was newer than the netbeans' plugin compatibility. I've been searching and can't find any updated plugin (and it is not in the plugin manager, at least for what I saw) Any idea where to find it?

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• Problem with Binding Multiple Objects on WPF

  - by Diego Modolo Ribeiro

  Hi, I'm developing a user control called SearchBox, that will act as a replacer for ComboBox for multiple records, as the performance in ComboBox is low for this scenario, but I'm having a big binding problem. I have a base control with a DependencyProperty called SelectedItem, and my SearchControl shows that control so that the user can select the record. The SearchControl also has a DependencyProperty called SelectedItem on it, and it is being updated when the user selects something on the base control, but the UI, wich has the SearchControl, is not being updated. I used a null converter so that I could see if the property was updating, but it's not. Below is some of the code: This is the UI: <NectarControles:MaskedSearchControl x:Name="teste" Grid.Row="0" Grid.Column="1" Height="21" ItemsSource="{Binding C001_Lista}" DisplayMember="C001_Codigo" Custom:CustomizadorTextBox.CodigoCampo="C001_Codigo" ViewType="{x:Type C001:C001_Search}" ViewModelType="{x:Type C001_ViewModel:C001_ViewModel}" SelectedItem="{Binding Path=Instancia.C001_Holding, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged, Converter={StaticResource DebuggingConverter}}"> </NectarControles:MaskedSearchControl> This is the relevante part of the SearchControl: Binding selectedItemBinding = new Binding("SelectedItem"); selectedItemBinding.Source = this.SearchControlBase; selectedItemBinding.Mode = BindingMode.TwoWay; selectedItemBinding.UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged; this.SetBinding(SelectedItemProperty, selectedItemBinding); ... public System.Data.Objects.DataClasses.IEntityWithKey SelectedItem { get { return (System.Data.Objects.DataClasses.IEntityWithKey)GetValue(SelectedItemProperty); } set { SetValue(SelectedItemProperty, value); if (PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs("SelectedItem")); } } Please someone help me... Tks...

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• jQuery Cycle Plugin: How to preload first images with a loading background gif then fade in Cycle Sl

  - by Theo Ribeiro

  Hello all, I'm struggling with this, maybe some of you can help... I have a home page slideshow with large images at www.theoribeiro.com using jQuery Cycle plugin Images are large and sometimes with slow connections (but even in fast ones) the behavior of the slideshow start is pretty ugly, showing the image all of a sudden or half-loaded. I want to make sure that at least the 2 or 3 first images are loaded before the slideshow starts and meanwhile I want to run a loading animated gif, then I want to fade in the first image. I searched a lot on the internet and on the forums and tried loads of stuff with my limited knowledge of javascript and jQuery but could't come up with a solution. Any help would be greatly appreciated!!!

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• Datamapper In Memory Database

  - by Daniel Ribeiro

  It is easy to setup Datamapper with a Sqlite3 in memory database with: DataMapper.setup :default, 'sqlite3::memory:'. However, when testing, I'd like to destroy the whole in memory database after each test, instead of invoking automigrate! as a shortcut on dropping everything. Is it possible? Or is it enough to set the default repository to nil, and let the garbage collector dispose of it?

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• How know a variable type in java?

  - by Miguel Ribeiro

  Hi. I wanted a thing like I declare a variable: String a = "test"; And want to know what type it is, i.e., the output should be java.lang.String thanks in advance

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• String codification to Twitter

  - by Miguel Ribeiro

  I'm developing a program that sends tweets. I have this piece of code: StringBuilder sb = new StringBuilder("Recomendo "); sb.append(lblName.getText()); sb.append(" no canal "+lblCanal.getText()); sb.append(" no dia "+date[2]+"/"+date[1]+"/"+date[0]); sb.append(" às "+time[0]+"h"+time[1]); byte[] defaultStrBytes = sb.toString().getBytes("ISO-8859-1"); String encodedString = new String(defaultStrBytes, "UTF-8"); But When I send it to tweet I get the "?" symbol or other strage characters because of the accents like "à" . I've also tried with only String encodedString = new String(sb.toString().getBytes(), "UTF-8"); //also tried with ISO-8859-1 but the problem remains...

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• Using thread in aspx-page making a webrequest

  - by Mike Ribeiro

  Hi, I kind of new to the hole threading stuff so bare with me here.. I have a aspx-page that takes some input and makes a reqest: HttpWebRequest request = (HttpWebRequest)WebRequest.Create(string.Format("{0}?{1}", strPostPath, strPostData)); request.Method = "GET"; request.Timeout = 5000; // set 5 sec. timeout request.ProtocolVersion = HttpVersion.Version11; try { HttpWebResponse response = (HttpWebResponse)request.GetResponse(); /do some with response } catch (WebException exce) { //Log some stuff } The thing is that this function is used ALOT. Is there any advantage to make every request in a separate thread and exactly how would that look like? Thx!

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• DFS Backtracking with java

  - by Cláudio Ribeiro

  I'm having problems with DFS backtracking in an adjacency matrix. Here's my code: (i added the test to the main in case someone wants to test it) public class Graph { private int numVertex; private int numEdges; private boolean[][] adj; public Graph(int numVertex, int numEdges) { this.numVertex = numVertex; this.numEdges = numEdges; this.adj = new boolean[numVertex][numVertex]; } public void addEdge(int start, int end){ adj[start-1][end-1] = true; adj[end-1][start-1] = true; } List<Integer> visited = new ArrayList<Integer>(); public Integer DFS(Graph G, int startVertex){ int i=0; if(pilha.isEmpty()) pilha.push(startVertex); for(i=1; i<G.numVertex; i++){ pilha.push(i); if(G.adj[i-1][startVertex-1] != false){ G.adj[i-1][startVertex-1] = false; G.adj[startVertex-1][i-1] = false; DFS(G,i); break; }else{ visited.add(pilha.pop()); } System.out.println("Stack: " + pilha); } return -1; } Stack<Integer> pilha = new Stack(); public static void main(String[] args) { Graph g = new Graph(6, 9); g.addEdge(1, 2); g.addEdge(1, 5); g.addEdge(2, 4); g.addEdge(2, 5); g.addEdge(2, 6); g.addEdge(3, 4); g.addEdge(3, 5); g.addEdge(4, 5); g.addEdge(6, 4); g.DFS(g, 1); } } I'm trying to solve the euler path problem. the program solves basic graphs but when it needs to backtrack, it just does not do it. I think the problem might be in the stack manipulations or in the recursive dfs call. I've tried a lot of things, but still can't seem to figure out why it does not backtrack. Can somebody help me ?

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• RewriteRule and Proxy

  - by Felipe Alvarez

  Two servers. example.net, and example.com On http://example.net, My httpd.conf contains # example.net RewriteEngine On RewriteRule ^/felipetest2 http://example.com/webpage [P] I am getting a 302 Moved, which is pointing to http://example.net/webpage, but should be http://example.com/webpage What's going on? I have control over both .net and .com servers in these examples. I know I can do the same with ProxyPass and ProxyPassReverse, but I'm trying to get my head around this one. Edit: Main Question: How do I show a maintenance page, without changing URL in the browser? On same domain, or across different domains?

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• lftp make-backup not functioning as expected

  - by Felipe Alvarez

  With default settings, when 'putting' the file, it is clobbered without complaint or warning. When 'getting' lftp complains: get: super.sh: file already exists and xfer:clobber is unset I change my /etc/lftp.conf and append: set xfer:make-backup yes set xfer:clobber yes When putting and getting, the files get clobbered, however no backup is made. I've checked the settings with "set -a | grep clob" and "set -a | grep backup" and the values are correct.

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• nmap: easily Ping-Scan all addresses in my subnet

  - by Felipe Alvarez

  Is there an nmap line that will auto-detect my current IP address and subnet mask, and run a ping-scan on all? For example: #> nmap -sP 0.0.0.0 Instead of manually: #> nmap -sP 192.168.100.0/24

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• Apache configuration to access for directory

  - by Felipe Hummel

  I'm on Ubuntu 9.10. My web application is in a directory on my /home/me/app . I want to configure Apache in such a way that I can access my app through a directory. For example: People can access my machine through domain.com. What I would like to do is access my web application (located at /home/me/app) through a directory, using something like: domain.com/myapp. How can I set up the apache configuration for this kind of behavior? Of course, I do not want to move all my application to /var/www/myapp. Thanks

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• Apache configuration to access directory

  - by Felipe Hummel

  I'm on Ubuntu 9.10. My web application is in a directory on my /home/me/app . I want to configure Apache in such a way that I can access my app through a directory. For example: People can access my machine through domain.com. What I would like to do is access my web application (located at /home/me/app) through a directory, using something like: domain.com/myapp. How can I set up the apache configuration for this kind of behavior? Of course, I do not want to move all my application to /var/www/myapp. Thanks

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• Apache configuration to access directory

  - by Felipe Hummel

  I'm on Ubuntu 9.10. My web application is in a directory on my /home/me/app . I want to configure Apache in such a way that I can access my app through a directory. For example: People can access my machine through domain.com. What I would like to do is access my web application (located at /home/me/app) through a directory, using something like: domain.com/myapp. How can I set up the apache configuration for this kind of behavior? Of course, I do not want to move all my application to /var/www/myapp. Thanks

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• Good Linux disaster-ready filesystem?

  - by Felipe Solís

  I'm working on this emergency open wi-fi network project and it includes a local website (nginx + MySQL). In order to eliminate SPOFs, we're going to setup at least two of everything (server, switch, router, etc.). This network is thought to work when an earthquake strikes and it's very likely to a server to go to down, if so, we need to be able to boot them up and be operating as soon as possible. Do any of you know if any linux filesystem would work better than others in this scenario?

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• Entering 'domain' information when connecting to SAMBA share in Dolphin

  - by Felipe Alvarez

  openSUSE 11.2. KDE 4.3.5 Dolphin 1.3 The following works on CL mount -v -o username=abcdefg,domain=DOM -t cifs //server.tld/share/path /mnt Authentication fails when trying to connect to this share via Dolphin. "domain=DOM" is a required field. How do I force dolphin to connect to it? On Dolphin, the following fails: smb://[email protected]/server/path

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• I want to execute the commands in a loop at the same time, not one after another

  - by Felipe Alvarez

  I'd like to write a loop ('for') that will do some action 'X' number of times. But instead of performing the actions sequentially, one after another, I'd like them to execute simultaneously (in parellel at the same time). How can this be achieved? Script or a one liner are fine. example ONLY: for i in 1 2 3 4 5; do dd if=/dev/zero of=/tmp/disk$i bs=10M count=10; done

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• unpack 'tar' but change directory name to extract to

  - by Felipe Alvarez

  tar -tf filename.tar folder1/file folder1/name [...] I'd like to extract file and name to, folder2. Can this be done as a one-liner?

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• how can i move ext3 partition to the beginning of drive without losing data?

  - by Felipe Alvarez

  I have a 500GB external drive. It had two partitions, each around 250GB. I removed the first partition. I'd like to move the 2nd to the left, so it consumes 100% of the drive. How can this be accomplished without any GUI tools (CLI only)? fdisk Disk /dev/sdd: 500.1 GB, 500107862016 bytes 255 heads, 63 sectors/track, 60801 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Disk identifier: 0xc80b1f3d Device Boot Start End Blocks Id System /dev/sdd2 29374 60801 252445410 83 Linux parted Model: ST350032 0AS (scsi) Disk /dev/sdd: 500GB Sector size (logical/physical): 512B/512B Partition Table: msdos Number Start End Size Type File system Flags 2 242GB 500GB 259GB primary ext3 type=83 dumpe2fs Filesystem volume name: extstar Last mounted on: <not available> Filesystem UUID: f0b1d2bc-08b8-4f6e-b1c6-c529024a777d Filesystem magic number: 0xEF53 Filesystem revision #: 1 (dynamic) Filesystem features: has_journal dir_index filetype needs_recovery sparse_super large_file Filesystem flags: signed_directory_hash Default mount options: (none) Filesystem state: clean Errors behavior: Continue Filesystem OS type: Linux Inode count: 15808608 Block count: 63111168 Reserved block count: 0 Free blocks: 2449985 Free inodes: 15799302 First block: 0 Block size: 4096 Fragment size: 4096 Blocks per group: 32768 Fragments per group: 32768 Inodes per group: 8208 Inode blocks per group: 513 Filesystem created: Mon Feb 15 08:07:01 2010 Last mount time: Fri May 21 19:31:30 2010 Last write time: Fri May 21 19:31:30 2010 Mount count: 5 Maximum mount count: 29 Last checked: Mon May 17 14:52:47 2010 Check interval: 15552000 (6 months) Next check after: Sat Nov 13 14:52:47 2010 Reserved blocks uid: 0 (user root) Reserved blocks gid: 0 (group root) First inode: 11 Inode size: 256 Required extra isize: 28 Desired extra isize: 28 Journal inode: 8 Default directory hash: half_md4 Directory Hash Seed: d0363517-c095-4f53-baa7-7428c02fbfc6 Journal backup: inode blocks Journal size: 128M

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