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  • Is Cassandra database row size limited by available memory?

    - by Adam Hollidge
    I'm working with very long time series -- hundreds of millions of data points in one series -- and am considering Cassandra as a data store. In this question, one of the Cassandra committers (the über helpful jbellis) says that Cassandra rows can be very large, and that column slicing operations are faster than row slices, hence my question: Is the row size still limited by available memory?

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  • SQL Database application written in Visual Basic in Visual Studio 2010

    - by TID
    Hello, I am writing a program and part of it is to store the keyed entry in a database on an sql server when the enter key is hit. The database is small and simple with only three entry spots in the table. one for the tracking number, one for the date entered, and one for the time entered. The only thing the user will see is the tracking number text box and an enter button. the date and time will be auto entered when the enter key is hit. i am relatively new to databases so i cannot figure out how to send the data to the database. The database is already configured, just need to get the program and the database talking to eachother. Thanks.

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  • Any dynamic database frontend tool from which you can update directly?

    - by Enjoy coding
    Hi Gurus, This is with reference to this question where I got one tabular report format. I need to update the user entered values correctly back to the same table rows. I am in the process of doing this by using general form post data methods by using some logics which I think will not be easy to maintain. So, just out of curiosity, Is there a front end creator javascript libraries or frameworks which can create the front end for any query's resultset and updates the corresponding rows when the user updates them from front end. This need not have all the full functionality, any one usable, customizable thing will reduce the code maintenance problems. I have googled for some javascript libraris for this but not able to get which will be suitable. Please suggest any useful tools. My environment is Mysql, PHP, JQuery, XAMPP server on Windows. Is JQuery provides one. Thanks in advance.

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  • The database 'DB Name' is not accessible.

    - by Gurucharan
    I am getting following error each time I tried to select database. The database 'DB Name' is not accessible. (Microsoft.SqlServer.Express.ObjectExplorer) Note: My OS is Win Vista. When I tried to open SQL Mgmt Studio as Run as administrator than I can able to access database properly. Any idea why it is giving error. I am also getting following error when my asp.net application is trying to access database. Cannot open database "DBName" requested by the login. The login failed. Login failed for user 'PCName\abcd'. I am not very good with SQL Server, please let me know how to create user and grant them permission in case that is what causing the problem. Thanks.

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  • Don't know how to encrypt database using SQLCipher

    - by Armaan
    I have included SQLCipher into my project exactly like explained in this link: http://sqlcipher.net/ios-tutorial/ But I am not sure how to encrypt the database I have read description from above link but not getting. Actually what I am doing is if application is opening first time then it will copy the database(i.e. without encryption) to the document directory. One more thing my database is blank when copying from bundle to document directory. I have tried to use sqlite3_key function after opening the database but nothing is encrypted. But I didn't found something like how to encrypt database when copying from bundle to document directory. I am planning to use FMDB so it would be better to reply according to that. Please guide me how to do that or point to direction if is there any tutorial for it. Also suggest what should be the standard approach to do that.

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  • How to organize database access code in Android project?

    - by Mladen Jablanovic
    I have created a ContentProvider for my main Sqlite table, pretty much following NotePad example from SDK (although I am not sure whether I will ever be exposing my data to other apps). However, I need to create lots of other, non-trivial queries on that and other tables and views. A good example would be queries to extract some statistics from the base data, averages, totals etc. So what's the best place for this code in an Android project? How it should be related and connected to the Uri-based data access exposed by a Provider? Any good examples out there?

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  • What's in-memory database technology that do realtime materialized view?

    - by KA100
    What I'm looking for is something like materialized views in front-end that shows my data in diffident ways without full recalculation. let's say I have stock watcher with many front-end views and dashborads some based on aggregation, order by or just filter with different criteria defined realtime by user. Now, I receive online record updates from some webservice and it's not like "data warehouse" every single record can be updated any time and it actually happens every second. Is there any technology can help me in such I create something like materialized view and it's update it without doing full recalculation every time data changed. Thank you.

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  • How can I set default seed for all identities within a SQL Server database?

    - by Brandon DuRette
    Is there a way to tell SQL server to use specific default seed value for IDENTITY columns - assuming the (to be run) CREATE TABLE statements do not specify one? I don't really care about altering existing data or altering the seed values for specific IDENTITY columns. I want the same seed for all newly created identity columns. Assume I cannot modify the individual CREATE TABLE statements in any way.

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  • PHP - Setting Database Info

    - by user1710648
    First off, I'm sorry if this shows no code which is not what Stack Overflow is about..But I have no clue where to go on this. I have a basic CMS I made, and I am trying to distribute it. I want to make it so that upon going to /cms/install for example, they set the database info, and different info to integrate into the CMS. Now my issue is, what would be the best method to allow the user to store that database info? A cookie seems to not be the right way..Could I store database info inside of a database? Not too sure where to go on this. More or less. What is the best way to temporarily store the database information the user gave before arrival of the full CMS.

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  • How can I Display an extract from MySQL database entry?

    - by ThatMacLad
    I'm after creating a webpage that includes a blog section and it currently displays the whole post on the homepage. I'd like to set it so that it only displays a certain part of the entry i.e 50 words. I'd then like to be able to set it so that I have a read more button below the post that links to the post id. I currently use post.php?=# (# = whatever the post id is). Here is the homepage: <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Blog Name</title> <link rel="stylesheet" href="css/style.css" type="text/css" /> <body> <div id="upper-bar"> <div id="bar-content"> <a href="#">Home</a> <a href="#">Archives</a> <a href="#">Contact</a> <a href="#">About</a> <a href="#"><img src="images/twitter.png" id="tweet"></a><a href="#"><img src="images/feed.png" id="feed"></a> </div> </div> <div id="clear"> </div> <div class="main"> <h1>Blog Name</h1> <div class="post-col"> <?php mysql_connect ('localhost', 'root', 'root') ; mysql_select_db ('tmlblog'); $sql = "SELECT * FROM php_blog ORDER BY timestamp DESC LIMIT 5"; $result = mysql_query($sql) or print ("Can't select entries from table php_blog.<br />" . $sql . "<br />" . mysql_error()); while($row = mysql_fetch_array($result)) { $date = date("l F d Y", $row['timestamp']); $title = stripslashes($row['title']); $entry = stripslashes($row['entry']); $id = $row['id']; ?> <div id='post-info'><?php echo "<p id='title'><strong><a href=\"post.php?id=". $id . "\">" . $title . "</a></strong></p>"; ?><br /></div> <div id="post"> <?php echo $entry; ?> <!--<br /><br /> Posted on <?php echo $date; ?> !--> </p> </div> </p> </div> <?php } ?> </div> </div> </body> </html>

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  • What is the best practise for relational database tables in mysql?

    - by George
    Hi, I know, there is a lot of info on mysql out there. But I was not really able to find an answer to this specific and actually simple question: Let's say I have two tables: USERS (with many fields, e.g. name, street, email, etc.) and GROUPS (also with many fields) The relation is (I guess?) 1:n, that is ONE user can be a member of MANY groups. What I dis, is create another table, named USERS_GROUPS_REL. This table has only two fields: us_id (unique key of table USERS) and gr_id (unique key of table GROUPS) In PHP I do a query with join. Is this "best practice" or is there a better way? Thankful for any hint!

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  • How to design a database where the main entity table has 25+ columns but a single entity's columns g

    - by thenextwebguy
    The entities to be stored have 25+ properties (table columns). The entities are pretty diverse, meaning that, most of the columns are empty. On average, I'd say, less than 20% (<5) properties have a value in any particular item. So, I have a lot of redundant empty columns for most of the table rows. Almost all of the columns are decimal numbers. Given this scenario, would you suggest serializing the columns instead, or perhaps, create another table named "Property", which would contain all the possible properties and then creating yet another table "EntityProperty" which would map an property to an entity using foreign keys? Or would you leave it as it is?

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  • Should I be backing up a webapp's data to another host continuously ?

    - by user196289
    I have webapp in development. I need to plan for what happens if the host goes down. I will lose some very recent session status (which I can live with) and everything else should be persistently stored in the database. If I am starting up again after an outage, can I expect a good host to reconstruct the database to within minutes of where I was up to ? Or seconds ? Or should I build in a background process to continually mirror the database elsewhere ? What is normal / sensible ? Obviously a good host will have RAID and other redundancy so the likelihood of total loss should be low, and if they have periodic backups I should lose only very recent stuff but this is presumably likely to be designed with almost static web content in mind, and my site is transactional with new data being filed continuously (with a customer expectation that I don't ever lose it). Any suggestions / advice ? Are there off the shelf frameworks for doing this ? (I'm primarily working in Java) And should I just plan to save the data or should I plan to have an alternative usable host implementation ready to launch in case the host doesn't come back up in a suitable timeframe ?

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  • export shared services from MOSS

    - by vittocia
    Hello, using the stsadm command I have been able to export a MOSS website and restore it on a different server which works fine. I tried the same for the shared services, it gave no errors, but it does not have all the import connections when I check around. Is there a better way to export and restore shared services, or a way to synch the import connections and user list?

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  • Automate uploading of videos to YouTube

    - by John
    Here's the problem: I would like to keep lots of home made videos. Of course, they are subject to being lost, or somebody could steal the the computer, or water or fire could destroy them. Secondly, I have to plug in my hard drive every time I want to watch something, which I find slow and cumbersome. I was thinking that perhaps I could upload the videos to Youtube with the privacy set to invite only and then delete the video from the hard drive automatically. Could this be done?

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  • Windows Home Server style redundancy/multi-disk-support on Windows Server 2008 R2?

    - by user19597
    I'm setting up a fileserver for our department. It'll be connected to the domain. I want it to have a very large amount of storage (several TB). Ideally, it should also preserve disk space by identifying identical files and only storing them once. It should be fault tollerant so that if one of the drives fails, that drive can be replaced without losing any data. All of these features are available in Microsoft's consumer offering - Windows Home Server. However, I can't find these kind of features within the enterprise Windows Server 2008 R2. Am I missing something? I know that I could buy a Drobo, or similar, and use this instead. However, I would prefer to use a built-in feature of Windows Server should it exist. It seems surprising to me that these features should be available in Home Server but not in an enterprise fileserver.

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  • LTO(4) tape shelf life estimation?

    - by emilp
    LTO tapes, Maxell in this case, are often marketed as having 30 years or more shelf life when stored under "optimal conditions" Is there a way to get a good estimation to the shelf life, given parameters such as relative humidity and temperature etc? Obsolescence of the tapes aside, is there a way of determining the impact to shelf life of any deviance from the optimal. In other words how many years are lost when storing say 1 degree above the specified range? regards Emil

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  • Bacula v5.0.2 Windows Installation Issues

    - by JohnyD
    First off, I am very new to Bacula but I'm very intriqued from what I've read. I'm looking to set up Bacula 5.0.2 on a Windows 2008 R2 server. I've run the installer and at the end it asks me to configure DIR name, DIR password, DIR Address. Windows documentation is somewhat hard to come by and I'm not certain what exactly I'm supposed to enter here. Do I need to create a local account that matches this info? Will the installation process create the account for me? Will this be the account that handles the FD daemon/service? I'm also not certain if Address means network location or local direcory. I apologize for my ignorance. Currently I'm trying to use the following information: Name: john pass: john address: thin1 (server name although I have also tried thin1.fqdm.local and 10.0.0.104) This info allows for the installer to complete successfully. However, when I run the BAT it hangs at, "Connecting to Director thin1:9101". The Bacula File Service is currently running under the local system account. What am I doing wrong? What do I have yet to do? Once I get this working properly I assume I will need to install clients on all my Windows boxes? Also, this is a 64-bit cpu but I am installing the 32-bit client. Are there any issues with this? Should I be using the 32-bit client? Thanks very much for the help.

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  • Ubuntu: Move fsbackup backups to Amazon S3

    - by Alexander Gladysh
    I have a legacy server (Ubuntu 9.10 Karmic x86), where previous admin set up backups with fsbackup. This server lives in a VPS (under some kind of Xen), and it is low on HDD space (16 GB total). Now it came to a point, where fsbackup backups take more space than the rest of data in the system. The filesystem is 100% filled, and I already cleaned up all that I could, aside from actual backups. I do not have any experience managing fsbackup, and I do not want to break or lose the backups. Googling fsbackup gives surprisingly low quality results... Here is how my backups look like: $ sudo ls -lh /var/archives total 8.1G -rw-rw---- 1 root root 318 2011-01-06 06:26 myserver-20110106.md5 -rw-rw---- 1 root root 258 2011-01-07 06:26 myserver-20110107.md5 -rw-rw---- 1 root root 318 2011-01-08 06:26 myserver-20110108.md5 -rw-rw---- 1 root root 318 2011-01-09 06:26 myserver-20110109.md5 -rw-rw---- 1 root root 346 2011-01-10 06:43 myserver-20110110.md5 -rw-rw---- 1 root root 14M 2011-01-06 06:26 myserver-all-mysql-databases.20110106.sql.bz2 -rw-rw---- 1 root root 14M 2011-01-07 06:26 myserver-all-mysql-databases.20110107.sql.bz2 -rw-rw---- 1 root root 14M 2011-01-08 06:26 myserver-all-mysql-databases.20110108.sql.bz2 -rw-rw---- 1 root root 14M 2011-01-09 06:26 myserver-all-mysql-databases.20110109.sql.bz2 -rw-rw---- 1 root root 862 2011-01-10 06:43 myserver-all-mysql-databases.20110110.sql.bz2 -rw-rw---- 1 root root 827K 2011-01-03 06:25 myserver-etc.20110103.master.tar.gz -rw-rw---- 1 root root 16K 2011-01-06 06:25 myserver-etc.20110106.tar.gz -rw-rw---- 1 root root 16K 2011-01-07 06:25 myserver-etc.20110107.tar.gz -rw-rw---- 1 root root 16K 2011-01-08 06:25 myserver-etc.20110108.tar.gz -rw-rw---- 1 root root 16K 2011-01-09 06:25 myserver-etc.20110109.tar.gz -rw-rw---- 1 root root 827K 2011-01-10 06:25 myserver-etc.20110110.master.tar.gz -rw------- 1 root root 36K 2011-01-10 06:25 myserver-etc.incremental.bin -rw-rw---- 1 root root 29M 2011-01-03 06:25 myserver-home.20110103.master.tar.gz -rw-rw---- 1 root root 11K 2011-01-06 06:25 myserver-home.20110106.tar.gz -rw-rw---- 1 root root 14K 2011-01-07 06:25 myserver-home.20110107.tar.gz -rw-rw---- 1 root root 11K 2011-01-08 06:25 myserver-home.20110108.tar.gz -rw-rw---- 1 root root 11K 2011-01-09 06:25 myserver-home.20110109.tar.gz -rw-rw---- 1 root root 2.0M 2011-01-10 06:25 myserver-home.20110110.master.tar.gz -rw------- 1 root root 27K 2011-01-10 06:25 myserver-home.incremental.bin -rw-rw---- 1 root root 1.5G 2011-01-03 06:29 myserver-opt.20110103.master.tar.gz -rw-rw---- 1 root root 1.5M 2011-01-06 06:25 myserver-opt.20110106.tar.gz -rw-rw---- 1 root root 1.5M 2011-01-07 06:25 myserver-opt.20110107.tar.gz -rw-rw---- 1 root root 1.5M 2011-01-08 06:25 myserver-opt.20110108.tar.gz -rw-rw---- 1 root root 1.5M 2011-01-09 06:25 myserver-opt.20110109.tar.gz -rw-rw---- 1 root root 1.5G 2011-01-10 06:30 myserver-opt.20110110.master.tar.gz -rw------- 1 root root 201K 2011-01-10 06:30 myserver-opt.incremental.bin -rw-rw---- 1 root root 2.3G 2011-01-03 06:41 myserver-srv.20110103.master.tar.gz -rw-rw---- 1 root root 44M 2011-01-06 06:26 myserver-srv.20110106.tar.gz -rw-rw---- 1 root root 27M 2011-01-07 06:25 myserver-srv.20110107.tar.gz -rw-rw---- 1 root root 39M 2011-01-08 06:26 myserver-srv.20110108.tar.gz -rw-rw---- 1 root root 2.0M 2011-01-09 06:25 myserver-srv.20110109.tar.gz -rw-rw---- 1 root root 2.7G 2011-01-10 06:42 myserver-srv.20110110.master.tar.gz -rw------- 1 root root 3.4M 2011-01-10 06:42 myserver-srv.incremental.bin I'm thinking about moving backups to Amazon S3, but before that I have to free some space, so the server can work. Perhaps I can mount /var/archives to an Amazon S3 bucket somehow... Any advice?

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