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• would unexpected power cuts harm the Linux OS?

  - by Johan Elmander

  I am developing an application on a Linux embedded board (runs Debian) e.g. Raspberry Pi, Beagle Board/Bone, or olimex. The boards works on an environment that the electricity is cut unexpectedly (it is far complicated to place PSU, etc.) and it would happen every day couple times. I wonder if the unexpected power cuts would cause crash/problem on the Linux Operation System? If it is something that I should worry, what would you suggest to prevent the damages on OS against the unexpected power cuts? PS. The application needs to writes some data to the storage medium (SD card), I think it would not be suitable to mount it as read-only.

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• embed file in Excel cell

  - by Crash893

  I'm working on a simple "DB" for some people at work and I don't want to do anything fancy. the fields should be something like name , number , notes , File:resume, notes (where file:notes is the acutall embedded resume. I cant see any obvious way to do this but i thought i would ask just the same. Is there a way to take a (pdf , doc , docx , txt) and throw it into a cell so a user can click on it and it will open the file in the approate program note: this db is going to be floating around between multiple sites so linking won't work.

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• Looking for FTP server that allows user management from database

  - by hughesdan

  I'm planning a server application that will handle files uploaded via FTP. The application must parse text documents that it receives and write them to a database (most likely a document-oriented database like Mongo). And the application must also relay all large binary files it receives to Amazon S3 for storage and hosting. I'd like to manage all aspects of the FTP server programmatically. For example, when a user registers via a web page the application should be able to create the user account in the database and provision a directory on the server for receiving files. I'm using a Linux server but am otherwise open to considering any programming language or framework. I experimented with VSFTPD but didn't like the way the application relies on config files and the creation of users and directories via the command line. Can someone please recommend what server framework I should consider? I'm a little biased toward solutions that leverage Javascript/Nodejs or Python. However, I'm open to anything that can run on a Linux box.

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• Linked Tables not working With Access Database

  - by Kronass

  Hi, I have an Access database in a computer and I want to access it from other computer in the network. so I made mapped drive and created Linked Tables, then Imported all the objects (forms, queries, reports). when I open access database in the second computer and make any changes in using the forms non of the changes are affected in the main computer (supposedly server) and vise-versa. what am I missing? if this way will not work how can I access the Access database from other computer in the network and be able to use all the objects and make changes in it? hint: Access Version at main computer is 2003 and client pc 2007, will it effect?

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• Sql Server database logs "missing"

  - by linkerro

  Here's the problem we're having: In the applications that are using the databases we get errors like: The log for database 'redactedDatabaseName' is not available. Check the event log for related error messages. Resolve any errors and restart the database. Cannot close event log because there are still event handle users active. The server log says this: Error: 9001, Severity: 21, State: 1. Context: The server in question is holding databases for a multi-tenant application and lately it's been under quite heavy loads. It has something like 3k small databases on it and these errors have been coming in the last week. We have a work-around right now, which is taking the database offline then bringing it online again. Any ideas why this is happening and how we can fix it?

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• Detect and monitor changes to MySQL database

  - by Wolfpack'08

  I use Drupal, and instead of having to use the formal interface to make small changes to a site all the time, I am wondering if there is a way to determine what modifications Drupal makes to the database so that I can make them manually the next time. For example, if I use Drupal’s interface to add a module to the site, I would like to be able to find out what database entries it changes/adds so that if I want to add another module, I can add or change the file or database entry myself instead of having to go through Druapl. This way, I can have better control over the system as well as gain a greater understanding of how it works underneath. My environment is Windows XP, MySQL latest stable, phpmyadmin.

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• How to dump remote database without mysqldump?

  - by deceze

  I want to dump the database on my remotely hosted site in regular intervals using a shell script. Unfortunately the server is locked down pretty tight, has no mysqldump installed, binary files can't be executed by normal users/in home directories (so I can't "install" it myself) and the database lives on a separate server, so I can't grab the files directly. The only thing I can do is log into the webserver via SSH and establish a connection to the database server using the mysql command line client. How can I dump the contents to a file a la mysqldump in SQL format? Bonus: If possible, how can I dump the contents directly to my end of the SSH connection?

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• Can unexpected power loss harm a Linux install?

  - by Johan Elmander

  I am developing an application on a Linux embedded board (runs Debian) e.g. Raspberry Pi, Beagle Board/Bone, or olimex. The boards works on an environment that the electricity is cut unexpectedly (it is far complicated to place PSU, etc.) and it would happen every day couple times. I wonder if the unexpected power cuts would cause crash/problem on the Linux Operation System? If it is something that I should worry, what would you suggest to prevent the damages on OS against the unexpected power cuts? PS. The application needs to writes some data to the storage medium (SD card), I think it would not be suitable to mount it as read-only.

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• Migrating data from Oracle database to Pervasive .DAT files

  - by kaychaks

  The requirement is to migrate some tables with data from a Oracle database server to Pervasive database's .DAT file. Then those .DAT files will be used by a Pervasive database server. The restriction is that Oracle DB can not directly migrate to the Pervasive DB. It has to generate the .DAT files and then the new .DAT files will replace the old one for the Pervasive DB which will then use them for the new data. I was trying this task with SSIS. Exporting the Oracle table to a delimited .txt file and then creating a .DAT file from that text file. I can export the data from Oracle to .txt but I am not finding any way to migrate .txt to Pervasive .DAT? Is this the right approach? If not then please help with my problem.

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• Change Read/Write permissions from command line or VB script without cacls

  - by Sam I am

  I need a way to automatically change the read/write permissions on a folder, on an Windows XP Embedded machine. The XPE image I'm using doesn't have all of the standard Windows tools, and apparently cacls is one of those tools that it doesn't have. If I simply type cacls into my command window, it tells me 'cacls' is not recognized as an internal or external command, operable program or batch file. Is there a way for me to change file/folder permissions in Windows XPE without the CACLS command, or is there a way I can download a version of cacls.exe that will run on the XPE machine?

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• Strip X Window System from OpenRD (Fedora core 8)

  - by disown

  I just got myself an OpenRD Client embedded box with an old Fedora 8 on it. Runs like a charm, only problem is that the default install has X on it, which I would like to remove in order to free up some space. I found a similar post here on the same topic, but yum groupremove doesn't work in my case, yum grouplist returns nothing, so I presume that no groups are defined. I don't know if this is because fedora 8 didn't have any groups, or because the OpenRD build is special in some way. In any case, I would like some tips on which package(s) to remove in order to remove an as big chunk of X as possible. Thanks in advance.

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• MySQL Database synchronizing with local and remote with c#

  - by Neo

  I've posted this here as its more of a mysql questions than c#, I have written some software that runs a local instance of mysql when it first starts, now once mysql is up I would like to synchronize the data between the remote database table and the local database table that the software runs (it shouldn't sync any other databases / tables as there are a lot). I have replication setup to synchronize the entire database to another server which works unless the server goes down then it never comes back up, so based on that I don't think replication will work as when the software is closed it also closes MySQL. So what would be the best method of synchronizing the remote and local databases?

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• How to setup Database Permissions on SqlServer Express 2008

  - by Timo Willemsen

  I'm using a code-first approach of using the Entity Framework. When I first run the application it will try to create the database matching my MVC models. However, it doesn't have permission to create it I think. I get the following error: CREATE DATABASE permission denied in database 'master'. What user is trying to access the SqlServer and how can I add it's permissions to let it work? This is the connectionstring I'm using (which should be right...) <add name="ContextDb" connectionString="data source=.\SQLEXPRESS;Integrated Security=SSPI;initial catalog=ContextDb" providerName="System.Data.SqlClient"/> Cheers

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• How to set RpcClientAccessServer for a Exchange 2010 mailbox database to a load balancer

  - by Archit Baweja

  I have 2 Exchange 2010 servers each with a Mailbox Database. I have also setup a Hardware Load Balancer (KEMP LoadMaster 2200 to be precise) to load balance the CAS role access. My HLB has an IP of 192.168.1.100. I've setup the DNS A record for mail.mydomain.com to point to 192.168.1.100. However when I try to set the RpcClientAccessServer on a mailbox database using Set-MailboxDatabase "My Mailbox Database" -RpcClientAccessServer mail.mydomain.com I get an error saying Exchange server "mail.mydomain.com" was not found. Please make sure you have typed it correctly. + CategoryInfo : NotSpecified: (:) [], ManagementObjectNotFoundException + FullyQualifiedErrorId : 4082394C Any ideas?

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• Suggestions for a SOHO/Home Asterisk system

  - by James

  I would like to buy a small embedded system that runs Linux and Asterisk. I would like two FXS ports ( to plug analogue phones into ) and one FXO port ( to plug in to my real line to allow access to the POTS ). I would like it to have a USB port to hold storage for voicemail. I really want it for home use so I would like it to be under £150 ( say $250 ), given that you can buy ADSL routers for around this much can any of them be made to run Linux and Asterisk? I don't want a PC as the power usage would be too high. I am looking for something like this ASDL router but open and able to run Asterisk or another open PBX. At worst I would like a box which had one FXO and two FXS and just made them completely available over IP to a full Asterisk system on a low power Atom system.

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• master-slave-slave replication: master will become bottleneck for writes

  - by JMW

  hi, the mysql database has arround 2TB of data. i have a master-slave-slave replication running. the application that uses the database does read (SELECT) queries just on one of the 2 slaves and write (DELETE/INSERT/UPDATE) queries on the master. the application does way more reads, than writes. if we have a problem with the read (SELECT) queries, we can just add another slave database and tell the application, that there is another salve. so it scales well... Currently, the master is running arround 40% disk io due to the writes. So i'm thinking about how to scale the the database in the future. Because one day the master will be overloaded. What could be a solution there? maybe mysql cluster? if so, are there any pitfalls or limitations in switching the database to ndb? thanks a lot in advance... :)

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• Localized database for customers

  - by Jim

  The company I work for, has just moved to AWS - and currently they have one very large central database with the instance currently located in America. However, one of their clients has requested that all of their data is held in the EU. So creating an AWS instance in Ireland isn't a problem, the problem is the database and how to manage it. We were considering having another database that runs in the EU for European customers, and use a different primary key step, so that the primary keys will never conflict in case the two locations need to be merged in the future. The problem is, if we have a customer that uses our system in both America, and the EU we would have to create 2 accounts for that user, and reporting across both regions would not be possible as the connection time would be too high. Is there an alternative to set this up?

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• Windows fails to restart on reboot

  - by daramarak

  We have many machines running windows xp embedded. The machines are configured to reboot if any problems should occur. But our problem now is that in some cases the machines seems to shut down, but never reboots again. The same machine might reboot fine in the next time we try. Does anyone have clue what the problem might be. Does anyone got some advice on how to debug this problem. Are there any logs that might contain valuable information? Recreating this problem is not done easily so elimination methods are not feasable.

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• Upgraded to Ubuntu 12.04 from 10.04 and have to transfer database from Postgresql 8.4 to 9.1

  - by Stpn

  I upgraded server with a Rails application to Ubuntu 12.04 from 10.04 and cannot connect to Postgresql database now... Here is the error message from Rails app: could not connect to server: No such file or directory Is the server running locally and accepting connections on Unix domain socket "/var/run/postgresql/.s.PGSQL.5432" Also the pg_ctl start is not recognized as a command.. EDIT: Turns out my database in on Postgresl 8.4 and my sever is now running on 9.1. So all the database files / configs are on 8.4.. How can I transfer them? Just straight copy from old pg_hba.conf?

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• Installing Drupal: Database configuration problem.

  - by abelenky

  I am trying to install Drupal 6.16 on a clean website. I get through the "Verify Requirements" page easily. On the Database Configuration, I supply all the proper info, but "Save and Continue" returns me back to the same page, with no error message. I am unable to proceed past this point. I've verified my info with the ISP, including a non-local database host (under Advanced Options), and that the database user has full DBA rights. The lack of an error message is particularly frustrating. Do you have any ideas what the problem is, or how to pursue it and resolve it?

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• Barnyard Service - MySQL Error

  - by SLYN

  I installed barnyard2 and saved as a service. When I run service barnyard2 start, Barnyard2 is failed. After I run tail -100 /var/log/messages and I encounter a fault like this. ERROR database: 'mysql' support is not compiled into this build of snort#012 Aug 22 11:52:06 barnyard2[25771]: FATAL ERROR: If this build of barnyard2 was obtained as a binary distribution (e.g., rpm,#012or Windows), then check for alternate builds that contains the necessary#012'mysql' support.#012#012If this build of barnyard2 was compiled by you, then re-run the#012the ./configure script using the '--with-mysql' switch.#012For non-standard installations of a database, the '--with-mysql=DIR'#012syntax may need to be used to specify the base directory of the DB install.#012#012See the database documentation for cursory details (doc/README.database).#012and the URL to the most recent database plugin documentation. Aug 22 11:52:06 barnyard2[25771]: Barnyard2 exiting What sould I do for solving this problem? When I installed Barnyard2, I used these commands: # ./configure --with-mysql --with-mysql-libraries=/usr/lib64/mysql # make ; make install (My System is CentOS 6.5 x86_64.)

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• How can I sync Access databases and keep them up-to-date?

  - by user327472

  I have an Access database on my server. We split it up and use the front-end database for search data and adding new records or reports in local computer. If we update or add a new record, that writes to the back-end of database. I want to use this database in the other building with other servers. Also, those servers have no direct connection. How can I sync both back-end databases to keep the database data up to date? These details may be useful: It's a big amount of data - about 25,750 client records. I guess there are more than 25 tables at 80 MB.

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• connect to my database from another computer

  - by user3482102

  Sorry for being a :noob I am a student working on a dbms project on my laptop. I have installed mariadb and I have root access. Similarly the case with my friend's laptop. The problem is we both want to work on same database collectively as we are partners of a team in the project. How can I create a database in mariadb that we both can share? How to access that database? Please specify the software to use and implementation.

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• Linux (lsusb) not showing String Descriptors of a USB device

  - by tzippy

  I have an embedded device that when plugged to a linux host, shows up with vid and pid that are not in the usb.ids file (proprietary IDs). However I provide String Descriptors that do show up when plugged into a Windows Host. But not on a Linux Host. lsusb -v shows only iManufacturer 3 iProduct 2 iSerial 1 But on the device side, when processing the setup requests, I see that the Strings are actually requested by the Host. By Windows and also the Linux Host. The USB Device Tree Viewwer under Windows shows this output: iManufacturer : 0x01 Language 0x0409 : "My Manufacturer" iProduct : 0x02 Language 0x0409 : "MyProduct" iSerialNumber : 0x03 Language 0x0409 : "My Serial" I feel that lsusb does not show all of the information. Is there a more informative tool?

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• How to cache dynamic javascript/jquery/ajax/json content with Akamai

  - by Starfs

  Trying to wrap my head around how things are cached on a CDN and it is new territory for me. In the document we received about sending in environment requests, it says "Dynamically-generated content will not benefit much from EdgeSuite". I feel like this is a simplified statement and there has to be a way to make it so you cache dynamically generated content if the tools are configured correctly. The site we are working with runs off a wordpress database, and uses javascript and ajax to build the pages, based on the json objects that php scripts have generated. The process - user's browser this URL, browser talks to edgesuite tools which will have cached certain pre-defined elements, and then requests from the host web server anything that is not cached, once edgesuite has compiled a combination of the two, it sends that information back to the browser. Can we not simply cache all json objects (and of course images, js, css) and therefore the web browser never has to hit the host server's database, at which point in essence, we have cached our dynamic content? Does anyone have any pointers on the most efficient configuration for this type of system -- Akamai/CDN -- to served javascript/ajax/json generated pages that ideally already hit pre-cached json data? Any and all feedback is welcome!

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