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  • The Next RAC, ASM and Linux Forum. May 4, 2010 Beit HP Raanana

    - by alejandro.vargas
    The next RAC, ASM and Linux forum will take place next week, you are still on time to register : Israel Oracle Users Group RAC,ASM and Linux Forum This time we will have a panel formed by Principal Oracle Advanced Customer Services Engineers and RAC experts Galit Elad and Nickita Chernovski and Senior Oracle Advanced Customer Services Engineers and RAC experts Roy Burstein and Dorit Noga. They will address the subject: 5 years of experience with RAC at Israeli Customers, lessons learned. It is a wonderful opportunity to meet with the people that is present at most major implementations and helped to solve all major issues along the last years. In addition we will have 2 most interesting Customer Presentations: Visa Cal DBA Team Leader Harel Safra will tell about their experience with scalability using standard Linux Servers for their mission critical data warehouse. Bank Discount Infrastructure DBA Uril Levin, who is in charge of the Bank Backup and Recovery Project, will speak about their Corporate Backup Solution using RMAN; that includes an end to end solution for VLDBS and mission critical databases. One of the most interesting RMAN implementations in Israel. This time I will not be able to attend myself as I'm abroad on business, Galit Elad will greet you and will lead the meeting. I'm sure you will enjoy a very, very interesting meeting. Best Regards Alejandro

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  • Apache2 return 404 for proxy requests before reaching WSGI

    - by Alejandro Mezcua
    I have a Django app running under Apache2 and mod_wsgi and, unfortunately, lots of requests trying to use the server as a proxy. The server is responding OK with 404 errors but the errors are generated by the Django (WSGI) app, which causes a high CPU usage. If I turn off the app and let Apache handle the response directly (send a 404), the CPU usage drops to almost 0 (mod_proxy is not enabled). Is there a way to configure Apache to respond directly to this kind of requests with an error before the request hits the WSGI app? I have seen that maybe mod_security would be an option, but I'd like to know if I can do it without it. EDIT. I'll explain it a bit more. In the logs I have lots of connections trying to use the server as a web proxy (e.g. connections like GET http://zzz.zzz/ HTTP/1.1 where zzz.zzz is an external domain, not mine). This requests are passed on to mod_wsgi which then return a 404 (as per my Django app). If I disable the app, as mod_proxy is disabled, Apache returns the error directly. What I'd finally like to do is prevent Apache from passing the request to the WSGI for invalid domains, that is, if the request is a proxy request, directly return the error and not execute the WSGI app. EDIT2. Here is the apache2 config, using VirtualHosts files in sites-enabled (i have removed email addresses and changed IPs to xxx, change the server alias to sample.sample.xxx). What I'd like is for Apache to reject any request that doesn't go to sample.sample.xxx with and error, that is, accept only relative requests to the server or fully qualified only to the actual ServerAlias. default: <VirtualHost *:80> ServerAdmin alejandro[email protected] ServerName X.X.X.X ServerAlias X.X.X.X DocumentRoot /var/www/default <Directory /> Options FollowSymLinks AllowOverride None </Directory> <Directory /var/www/> Options FollowSymLinks AllowOverride None Order allow,deny allow from all </Directory> ErrorDocument 404 "404" ErrorDocument 403 "403" ErrorDocument 500 "500" ErrorLog ${APACHE_LOG_DIR}/error.log LogLevel warn CustomLog ${APACHE_LOG_DIR}/access.log combined </VirtualHost> actual host: <VirtualHost *:80> ErrorDocument 404 "404" ErrorDocument 403 "403" ErrorDocument 500 "500" WSGIScriptAlias / /var/www/sample.sample.xxx/django.wsgi ServerAdmin alejandro[email protected] ServerAlias sample.sample.xxx ServerName sample.sample.xxx CustomLog /var/www/sample.sample.xxx/log/sample.sample.xxx-access.log combined Alias /robots.txt /var/www/sample.sample.xxx/static/robots.txt Alias /favicon.ico /var/www/sample.sample.xxx/static/favicon.ico AliasMatch ^/([^/]*\.css) /var/www/sample.sample.xxx/static/$1 Alias /static/ /var/www/sample.sample.xxx/static/ Alias /media/ /var/www/sample.sample.xxx/media/ <Directory /var/www/sample.sample.xxx/static/> Order deny,allow Allow from all </Directory> <Directory /var/www/sample.sample.xxx/media/> Order deny,allow Allow from all </Directory> </VirtualHost>

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  • Cloning A Database On The Same Server Using Rman Duplicate From Active Database

    - by alejandro.vargas
    To clone a database using Rman we used to require an existing Rman backup, on 11g we can clone databases using the "from active" database option. In this case we do not require an existing backup, the active datafiles will be used as the source for the clone. In order to clone with the source database open it must be on archivelog mode. Otherwise we can make the clone mounting the source database, as shown in this example. These are the steps required to complete the clone: Configure The Network Create A Password File For The New Database Create An Init.Ora For The New Database Create The Admin Directory For The New Database Shutdown And Startup Mount The Source Database Startup Nomount The New Database Connect To The Target (Source) And Auxiliary (New Clone) Databases Using Rman Execute The Duplicate Command Remove The Old Pfile Check The New Database A step by step example is provided on this file: rman-duplicate-from-active-database.pdf

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  • ubuntu-12.04-wubi-i386.tar.xz for the wubi installer

    - by Alejandro
    I ran the wubi installer (from an extracted ubuntu ISO) and it downloads ubuntu-12.04-wubi-i386.tar.xz but it's slow and non-resumable so I cancelled it, found a mirror of the file online and downloaded it using Intenet download manager. Where should I be placing ubuntu-12.04-wubi-i386.tar.xz file so the wubi installer won't have to download that file anymore? Thank you. Update: I extracted the archive and there are two files, I'm afraid I do not know where to place them.

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  • Oracle Database 11g Underground Advice for Database Administrators, by April C. Sims

    - by alejandro.vargas
    Recently I received a request to review the book "Oracle Database 11g Underground Advice for Database Administrators" by April C. Sims I was happy to have the opportunity know some details about the author, she is an active contributor to the Oracle DBA community, through her blog "Oracle High Availability" . The book is a serious and interesting work, I think it provides a good study and reference guide for DBA's that want to understand and implement highly available environments. She starts walking over the more general aspects and skills required by a DBA and then goes on explaining the steps required to implement Data Guard, using RMAN, upgrading to 11g, etc.

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  • How to Calculate TCP Socket Buffer Sizes for Data Guard Environments

    - by alejandro.vargas
    The MAA best practices contains an example of how to calculate the optimal TCP socket buffer sizes, that is quite important for very busy Data Guard environments, this document Formula to Calculate TCP Socket Buffer Sizes.pdf contains an example of using the instructions provided on the best practices document. In order to execute the calculation you need to know which is the band with or your network interface, usually will be 1Gb, on my example is a 10Gb network; and the round trip time, RTT, that is the time it takes for a packet to make a travel to the other end of the network and come back, on my example that was provided by the network administrator and was 3 ms (1000/seconds)

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  • Impact of Truncate or Drop Table When Flashback Database is Enabled

    - by alejandro.vargas
    Recently I was working on a VLDB on the implementation of a disaster recovery environment configured with data guard physical standby and fast start failover. One of the questions that come up was about the overhead of truncating and dropping tables. There are daily jobs on the database that truncate extremely large partitions, and as note 565535.1 explains, we knew there is an overhead for these operations. But the information on the note was not clear enough, we the additional information I've got from Senior Oracle colleagues I did compile this document "Impact of Truncate or Drop Table When Flashback Database is Enabled" that further explain the case

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  • Efficient visualization of a large voxelized volume

    - by Alejandro Piad
    Lets consider a large voxelized volume stored in an oct-tree or any other convenient structure. This volume represents, for instance, a landscape, where each block is either empty (air), or it has an specific material that will be later used to apply a texture. Voxels that are next to each other represent connected sections of the surface. What I need is an algorithm to generate a mesh from this voxels that represents the volume, with the following caracteristics: All the "holes" in the voxelized volume are correct. All the connections are correct, i.e. seamless. The surface appears smooth. In a broad sense, I want to somehow preserve the surface topology, meaning that connected sections remain connected in the resulting mesh and that the surface has a curvature that responds to the voxels topology. Imagine trying to render the Minecraft world but getting the mountain ladders to be smooth instead of blocky.

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  • Implementing a post-notification function to perform custom validation

    - by Alejandro Sosa
    Introduction Oracle Workflow Notification System can be extended to perform extra validation or processing via PLSQL procedures when the notification is being responded to. These PLSQL procedures are called post-notification functions since they are executed after a notification action such as Approve, Reject, Reassign or Request Information is performed. The standard signature for the post-notification function is     procedure <procedure_name> (itemtype  in varchar2,                                itemkey   in varchar2,                                actid     in varchar2,                                funcmode  in varchar2,                                resultout in out nocopy varchar2); Modes The post-notification function provides the parameter 'funcmode' which will have the following values: 'RESPOND', 'VALIDATE, and 'RUN' for a notification is responded to (Approve, Reject, etc) 'FORWARD' for a notification being forwarded to another user 'TRANSFER' for a notification being transferred to another user 'QUESTION' for a request of more information from one user to another 'QUESTION' for a response to a request of more information 'TIMEOUT' for a timed-out notification 'CANCEL' when the notification is being re-executed in a loop. Context Variables Oracle Workflow provides different context information that corresponds to the current notification being acted upon to the post-notification function. WF_ENGINE.context_nid - The notification ID  WF_ENGINE.context_new_role - The new role to which the action on the notification is directed WF_ENGINE.context_user_comment - Comments appended to the notification   WF_ENGINE.context_user - The user who is responsible for taking the action that updated the notification's state WF_ENGINE.context_recipient_role - The role currently designated as the recipient of the notification. This value may be the same as the value of WF_ENGINE.context_user variable, or it may be a group role of which the context user is a member. WF_ENGINE.context_original_recipient - The role that has ownership of and responsibility for the notification. This value may differ from the value of the WF_ENGINE.context_recipient_role variable if the notification has previously been reassigned.  Example Let us assume there is an EBS transaction that can only be approved by a certain people thus any attempt to transfer or delegate such notification should be allowed only to users SPIERSON or CBAKER. The way to implement this functionality would be as follows: Edit the corresponding workflow definition in Workflow Builder and open the notification. In the Function Name enter the name of the procedure where the custom code is handled, for instance, TEST_PACKAGE.Post_Notification In PLSQL create the corresponding package TEST_PACKAGE with a procedure named Post_Notification, as follows:     procedure Post_Notification (itemtype  in varchar2,                                  itemkey   in varchar2,                                  actid     in varchar2,                                  funcmode  in varchar2,                                  resultout in out nocopy varchar2) is     l_count number;     begin       if funcmode in ('TRANSFER','FORWARD') then         select count(1) into l_count         from WF_ROLES         where WF_ENGINE.context_new_role in ('SPIERSON','CBAKER');               --and/or any other conditions         if l_count<1 then           WF_CORE.TOKEN('ROLE', WF_ENGINE.context_new_role);           WF_CORE.RAISE('WFNTF_TRANSFER_FAIL');         end if;       end if;     end Post_Notification; Launch the workflow process with the changed notification and attempt to reassign or transfer it. When trying to reassign the notification to user CBROWN the screen would like like below: Check the Workflow API Reference Guide, section Post-Notification Functions, to see all the standard, seeded WF_ENGINE variables available for extending notifications processing. 

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  • Volume range is narrow in 12.04

    - by Alejandro
    I have upgraded to Ubuntu 12.04 and I have a problem with the volume. The problem is that the volume is 0 when the volume bar is between 0% and 66% more or less, so the actual volume range is only between 66% and 100%. If I open the sound configuration menu, the position in the volume bar that makes the sound begin sounding (66% more or less) is placed where it says "no amplification". Can anyone help me? Thank you.

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  • E-Business Suite Proactive Support - Workflow Analyzer

    - by Alejandro Sosa
    Overview The Workflow Analyzer is a standalone, easy to run tool created to read, validate and troubleshoot Workflow components configuration as well as runtime. It identifies areas where potential problems may arise and based on set of best practices suggests the Workflow System Administrator what to do when such potential problems are found. This tool represents a proactive way to verify Workflow configuration and runtime data to prevent issues ahead of time before they may become of more considerable impact on a production environment. Installation Since it is standalone there are no pre-requisites and runs on Oracle E-Business applications from 11.5.10 onwards. It is installed in the back-end server and can be run directly from SQL*Plus. The output of this tool is written in a HTML file friendly formatted containing the following on both workflow Components configuration and Workflow Runtime data: Workflow-related database initialization parameters Relevant Oracle E-Business profile option values Workflow-owned concurrent programs schedule and Workflow components status Workflow notification mailer configuration and throughput via related queues and table Workflow-relevant recommended and critical one-off patches as well as current code level Workflow database footprint by reading Workflow run-time tables to identify aged processes not being purged. It also checks for large open and closed processes or unhealthy looping conditions in a workflow process, among other checks. See a sample of Workflow Analyzer's output here.  Besides performing the validations listed above, the Workflow Analyzer provides clarification on the issues it finds and refers the reader to specific Oracle MOS documents to address the findings or explains the condition for the reader to take proper action. How to get it? The Workflow Analyzer can be obtained from Oracle MOS Workflow Analyzer script for E-Business Suite Workflow Monitoring and Maintenance (Doc ID 1369938.1) and the supplemental note How to run EBS Workflow Analyzer Tool as a Concurrent Request (Doc ID 1425053.1) explains how to register and run this tool as a concurrent program. This way the report from the Workflow Analyzer can be submitted from the Application and its output can be seen from the application as well.

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  • Autocompleting \cite{} with emacs + auctex gives "cite: no such database entry"

    - by Alejandro Weinstein
    Hi: I am running Emacs 23.1.1 and AucTeX 11.85 in an Ubuntu 8.10 machine. After opening a tex file, the first time I try to use the autocompletion of the \cite{} command, I get "cite: info not available, use `C-c &' to get it." in the minibuffer. After doing the 'C-c &', I get "byte-code: No BibTeX entry with citation key". Subsequent calls to \cite gives me the message "cite: no such database entry" . I have a \bibliography{library} in my tex file, and the \cite{} entries that I did manually work as expected. I have the following in my .emacs (require 'reftex) (setq-default TeX-master nil) (add-hook 'LaTeX-mode-hook 'TeX-PDF-mode) ;turn on pdf-mode. AUCTeX ;will call pdflatex to ;compile instead of latex. (add-hook 'LaTeX-mode-hook 'LaTeX-math-mode) ;turn on math-mode by ;default (add-hook 'LaTeX-mode-hook 'reftex-mode) ;turn on REFTeX mode by ;default (add-hook 'LaTeX-mode-hook 'flyspell-mode) ;turn on flyspell mode by ;default (setq reftex-plug-into-AUCTeX t) (setq TeX-auto-save t) (setq TeX-save-query nil) (setq TeX-parse-self t) (setq-default TeX-master nil) I also tried the suggestions in http://stackoverflow.com/questions/2699017/suggestion-for-cite-in-emacs-with-auctex, but it didn't work either. Alejandro.

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  • Implementing a multilanguage AI contest platform

    - by Alejandro Piad
    This is a followup to this question. To sum: I'm implementing an AI contest site, where each user may submit several AI implementations for different games. Think about Google AI Challenge but instead of just having a big event once a year, I would like it more on a league fashion, with all virtual players playing with each other every some close period of time. I want to support as many programming languages as possible. I've seen that contest sites (like codeforces) ask you to submit a source code and interact through stdin and stdout. The first question is: what is the best way of supporting multiple languages? As I see it, I can either ask people to upload some binary/script, and interact either through stdin/*stdout*, or sockets, or the file system; or ask people to submit source code, and wrap it with whatever is necessary for the interaction. I would like to skip the need to compile the code by myself (in the server, I mean), but I am willing to do it if its the "best" choice. I need to comunicate virtual players with each other, or even better, with some intermediary arbiter. The second question is regarding security. If I'm going to be running user code in my server, I want to ensure strict security conditions, like no file system access, no networking, etc. Otherwise it would be a safe heaven for hackers. I will be implementing the engine/arbiter in .NET. I would like to support at least C#, C++, Java and Python for the user's implementations. I'm willing to write interfaces for each of these languages to simplify the user interaction with the system. Thanks in advance.

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  • Will polishing my current project be a better learning experience than starting a new one?

    - by Alejandro Cámara
    I started programming many years ago. Now I'm trying to make games. I have read many recommendations to start cloning some well known games like galaga, tetris, arkanoid, etc. I have also read that I should go for the whole game (including menus, sound, score, etc.). Yesterday I finished the first complete version of my arkanoid clone. But it is far from over. I can still work on it for months (I program as a hobby in my free time) implementing a screen resolution switcher, remap of the control keys, power-ups falling from broken bricks, and a huge etc. But I do not want to be forever learning how to clone ONE game. I have the urge to get to the next clone in order to apply some design ideas I have come upon while developing this arkanoid clone (at the same time I am reading the GoF book and much source code from Ludum Dare 21 game contest). So the question is: Should I keep improving the arkanoid clone until it has all the features the original game had? or should I move to the next clone (there are almost infinite games to clone) and start mending the things I did wrong with the previous clone? This can be a very subjective question, so please restrain the answers to the most effective way to learn how to make my own games (not cloning someone ideas). Thank you! CLARIFICATION In order to clarify what I have implemented I make this list: Features implemented: Bouncing capabilities (the ball bounces on walls, on bricks, and on the bar). Sounds when bouncing on bricks and the bar, and when the player wins or loses. Basic title menu (new game and exit only). Also in-game menu and win/lose menus. Only three levels, but the map system is so easy I do not think it will teach me much (am I wrong?). Features not-implemented: Power-ups when breaking the bricks. Complex bricks (with more than one "hit point" and invincible). Better graphics (I am not really good at it). Programming polishing (use more intensively the design patterns). Here's a link to its (minimal) webpage: http://blog.acamara.es/piperine/ I kind of feel ashamed to show it, so please do not hit me too hard :-) My question was related to the not-implemented features. I wondered what was the fastest (optimal) path to learn. 1) implement the not-implemented features in this project which is getting big, or 2) make a new game which probably will teach me those lessons and new ones. ANSWER I choose @ashes999 answer because, in my case, I think I should polish more and try to "ship" the game. I think all the other answers are also important to bear in mind, so if you came here having the same question, before taking a rush decision read all the discussion. Thank you all!

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  • Developing an ELO like point system for a multiplayer gaming site

    - by Alejandro Piad
    I'm currently working on a gaming site where users will submit virtual players for different games, like Chess, Nash, Backgammon, Go, etc. The idea is that users don't compete themselves, but through their virtual players. There will be leagues, tournaments, and other competition formats. The question is which would be a good rating system for users in this environment. Take into account that every user may have many different virtual players playing in many different games. As a general guideline I would like to guarantee the following properties: Users who have a lot of mediocre players should not score higher than users with a few very good players. A user with a high rating should not be penalized if he adds a new bad player, until he has had enough time to improve his player. Users who don't play often should not score higher than users who play every day. Thanks in advance.

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  • Ubuntu 12.04 booting into busybox after update

    - by Victor Alejandro Martinez
    Every time the system updates the kernel from 3.5.0-24 to 3.5.0-34 I get dropped into a busybox prompt at boot, but I can boot just fine using the previous kernel. I've tried all I know. I did a fsck.ext3 -f /dev/sdb2 using the alternate install CD. I've used boot-repair but to avail, I've checked for bad blocks but there are none. Should I purge the new kernel and use the old one instead? This is the output from boot-repair the first time, no purge. http://paste.ubuntu.com/5809230/

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  • Deleted windows partition, now I can't get into Ubuntu

    - by Alejandro
    Back story: I installed ubuntu with wubi. I had windows on one NTFS partition, then I made a new NTFS partition in which I put wubi in and where My ubuntu OS was born. Eventually I moved /home into another partition and made a swap partition, but I digress. I deleted My original NTFS partition where windows is not thinking it would not matter but now I can't get into ubuntu. And the weird thing is that when I boot my computer I still see the option to boot into both windows and ubuntu. When I try to boot into windows, It tries to fix stuff and never succeds. When I try to boot into ubuntu, it shows me "cannot find GRLDR in all devices. Press CTRL+ALT+DELETE to restart". so, what do you guys think? I just want ubuntu running again, with all my stuff in /home there and all my system preferences how I like them.

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  • cPAddons version conflict with Wordpress

    - by Joel Alejandro
    I have multiple users on my CentOS 5.7 server with WHM/cPanel, who have installed WordPress 3.2.1, and eventually did a manual update to 3.3.1, from Wordpress itself. Now the version of WP for those users doesn't match th one detected by cPanel, and of course, "Upgrade" doesn't work because the directory can't be cleaned (WP is already working there). I've looked on the .cpaddons folder of each user account, and there's a YAML file there, but I'm not sure how can I touch that file for solving this issue. Is there any way to tell cPanel that those WP installations are in fact, 3.3.1?

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  • Sharing information between nodes in Beowulf Cluster

    - by Alejandro Sazo
    I am setting up a beowulf cluster and I've been reading that it might be necessary to make the home directory of the cluster users shared between them (assuming this users are local to each machine). The other case is leave each user with its own home and the communication is up to the master node. Another idea that came up was to use an LDAP unique user logged on each machine in the cluster, that keeps the idea of the shared home between nodes (but is only one home of one user). Which approach is better for this kind of cluster? Edit: The cluster is running openmpi and it will support cuda and opencl

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  • Getting past dates in HP-UX with ksh

    - by Alejandro Atienza Ramos
    Ok, so I need to translate a script from a nice linux & bash configuration to ksh in hp-ux. Each and every command expects a different syntax and i want to kill myself. But let's skip the rant. This is part of my script anterior=`date +"%Y%0m" -d '1 month ago'` I basically need to get a past date in format 201002. Never mind the thing that, in the new environment, %0m means "no zeroes", while actually in the other one it means "yes, please put that zero on my string". It doesn't even accept the "1 month ago". I've read the man date for HP-UX and it seems you just can't do date arithmetic with it. I've been looking around for a while but all i find are lengthy solutions. I can't quite understand that such a typical administrative task like adding dates needs so much fuss. Isn't there a way to convert my one-liner to, well, i don't know, another one? Come on, i've seen proposed solutions that used bc, had thirty plus lines and magic number all over the script. The simplest solutions seem to use perl... but i don't know how to modify them, as they're quite arcane. Thanks!

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  • Mathematica ListcontourPlot3D

    - by Alejandro
    I have data in the form { {x,y,z,f}...} I am using ListContourPlot3D but all I get is an empty box with dimensions -1,1 in each direction. Here is my code: ListContourPlot3D[data5, PlotRange - All, AxesLabel - {"[Beta]", "[Omega]", "Vo"}, Contours - {1500}]. These are the first 5 points of my data:( the whole set has 55 points) {{200, 20000 10^(1/3), 2000, 1226}, {200, 20000 10^(1/3), 2600, 1422}, {200, 20000 10^(1/3), 3200, 1581}, {200, 20000 10^(1/3), 3800, 1761}, {200, 20000 10^(1/3), 4400, 1872}} Dimensions[data5] returns {55,4} If I do IntegerPart[data5] it does it correctly so it must recognize the numbers in my data. I appreciate any ideas. Thank you.

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