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  • More Tables or More Databases?

    - by BuckWoody
    I got an e-mail from someone that has an interesting situation. He has 15,000 customers, and he asks if he should have a database for their data per customer. Without a LOT more data it’s impossible to say, of course, but there are some general concepts to keep in mind. Whenever you’re segmenting data, it’s all about boundary choices. You have not only boundaries around how big the data will get, but things like how many objects (tables, stored procedures and so on) that will be involved, if there are any cross-sections of data (do they share location or product information) and – very important – what are the security requirements? From the answer to these types of questions, you now have the choice of making multiple tables in a single database, or using multiple databases. A database carries some overhead – it needs a certain amount of memory for locking and so on. But it has a very clean boundary – everything from objects to security can be kept apart. Having multiple users in the same database is possible as well, using things like a Schema. But keeping 15,000 schemas can be challenging as well. My recommendation in complex situations like this is similar to a post on decisions that I did earlier – I lay out the choices on a spreadsheet in rows, and then my requirements at the top in the columns. I  give each choice a number based on how well it meets each requirement. At the end, the highest number wins. And many times it’s a mix – perhaps this person could segment customers into larger regions or districts or products, in a database. Within that database might be multiple schemas for the customers. Of course, he needs to query across all customers, that becomes another requirement. Share this post: email it! | bookmark it! | digg it! | reddit! | kick it! | live it!

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  • Microsoft and Joyent Announce Node.js Windows Port

    With the Node.js command line tool, developers can type ?node my_app.js.' to run JavaScript programs. It gives developers a JavaScript application programming interface (API) supplies access for the network and file system as well. One instance where Node.js often comes in handy is in the creation of scalable networked programs that emphasize high concurrency and low response times. Developers who wish to use Node.js use on Windows at this time must do so running a virtual machine with Linux. Claudia Caldato, Principal Program Manager of Microsoft's Interoperability Strategy Team, offered...

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  • Approaching events #mstc11 #ppws #sqlbits

    - by Marco Russo (SQLBI)
    The spring season is always full of events and I’m just preparing for a number of them. First of all, we are getting very good interest for the PowerPivot Workshop in Copenhagen on 21-22 March 2011. Tomorrow (Friday March 4) will be the last day to take advantage of the Early Bird rate for this date. We will also participate to an evening meeting of local user groups on March 21 in Copenhagen, more news about this in the next few days. Other scheduled dates are in Dublin (28-29 March 2011) and in...(read more)

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  • apt-get works with --force-yes but cannot reproduce the issue on a fresh box

    - by deepak
    apt-get does not work the first time but works the second time i install ntp like: apt-get -q -y install ntp=1:4.2.6.p3+dfsg-1ubuntu3.1 It failed saying: WARNING: The following packages cannot be authenticated! libcap2 libopts25 ntp E: There are problems and -y was used without --force-yes Afterwards i ran, apt-key update and ran the same commad with --force-yes: apt-get -q -y --force-yes install ntp=1:4.2.6.p3+dfsg-1ubuntu3.1 Thereafter running apt-get purge and reinstalling ntp runs. "without" --force-yes apt-get purge libcap2 libopts25 ntp apt-get -q -y install ntp=1:4.2.6.p3+dfsg-1ubuntu3.1 Also i created a fresh VM and could not reproduce the issue. On a fresh VM, the same apt-get command runs the first time, without "--force-yes" Two questions, why does running apt-get work the second time and cannot reproduce the error ? full errors and sequential steps at, https://gist.github.com/3017966

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  • Apache 301 redirection from one domain to another

    - by Sebastien Lachance
    I'm trying to set a redirection in my VirtualHost configuration for my website. So far I am able to redirect non www trafficto the www address like this : <VirtualHost: *:80> ServerAlias www.gcbeauce.com RewriteEngine on RewriteCond %{HTTP_HOST} ^guidedescommercesdebeauce\.com$ [NC] RewriteRule ^(.*)$ http://www.guidedescommercesdebeauce.com$1 [R=301,L] But what I also want is to redirect the old domain to this new one. I have tried adding : RewriteEngine on RewriteCond %{HTTP_HOST} ^guidedescommercesdebeauce\.com$ [NC] RewriteCond %{HTTP_HOST} ^gcbeauce\.com$ [NC] RewriteRule ^(.*)$ http://www.guidedescommercesdebeauce.com$1 [R=301,L] But nothing happens. Am I missing something here?

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  • readobject method throws ClassNotFoundException

    - by eruina
    Hi all, I'm trying to pick up Java and wanted to test around with Java's client/server to make the client send a simple object of a self defined class(Message) over to the server. The problem was that I kept getting a ClassNotFoundException on the server side. I think the rest of the codes seem to be alright because other objects such as String can go through without problems. I had two different netbeans projects in different locations for client and server each. Each of them have their own copy of Message class under their respective packages. Message class implements Serializable. On the client side, I attempt to send a Message object through. On the server side, upon calling the readObject method, it seems to be finding Message class from the client's package instead of it's own. printStackTrace showed: "java.lang.ClassNotFoundException: client.Message" on the server side I have not even tried to cast or store the object received yet. Is there something I left out?

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  • Set and Verify the Retention Value for Change Data Capture

    - by AllenMWhite
    Last summer I set up Change Data Capture for a client to track changes to their application database to apply those changes to their data warehouse. The client had some issues a short while back and felt they needed to increase the retention period from the default 3 days to 5 days. I ran this query to make that change: sp_cdc_change_job @job_type='cleanup', @retention=7200 The value 7200 represents the number of minutes in a period of 5 days. All was well, but they recently asked how they can verify...(read more)

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  • /etc/postfix/transport missing; what should it look like?

    - by Thufir
    I'm following the mailman guide but couldn't locate /etc/postfix/ so created it as follows: root@dur:~# root@dur:~# cat /etc/postfix/transport dur.bounceme.net mailman: root@dur:~# root@dur:~# telnet localhost 25 Trying 127.0.0.1... Connected to localhost. Escape character is '^]'. 220 dur.bounceme.net ESMTP Postfix (Ubuntu) ehlo fqdn_test 250-dur.bounceme.net 250-PIPELINING 250-SIZE 10240000 250-VRFY 250-ETRN 250-STARTTLS 250-ENHANCEDSTATUSCODES 250-8BITMIME 250 DSN mail from:[email protected] 250 2.1.0 Ok rcpt to:thufir@localhost 451 4.3.0 <thufir@localhost>: Temporary lookup failure rcpt to:[email protected] 451 4.3.0 <[email protected]>: Temporary lookup failure quit 221 2.0.0 Bye Connection closed by foreign host. root@dur:~# root@dur:~# postconf -n alias_database = hash:/etc/aliases alias_maps = hash:/etc/aliases, hash:/var/lib/mailman/data/aliases append_dot_mydomain = no biff = no broken_sasl_auth_clients = yes config_directory = /etc/postfix default_transport = smtp home_mailbox = Maildir/ inet_interfaces = loopback-only mailbox_command = /usr/lib/dovecot/deliver -c /etc/dovecot/conf.d/01-mail-stack-delivery.conf -m "${EXTENSION}" mailbox_size_limit = 0 mailman_destination_recipient_limit = 1 mydestination = dur, dur.bounceme.net, localhost.bounceme.net, localhost myhostname = dur.bounceme.net mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 readme_directory = no recipient_delimiter = + relay_domains = lists.dur.bounceme.net relay_transport = relay relayhost = smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache smtp_use_tls = yes smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu) smtpd_recipient_restrictions = reject_unknown_sender_domain, reject_unknown_recipient_domain, reject_unauth_pipelining, permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination smtpd_sasl_auth_enable = yes smtpd_sasl_authenticated_header = yes smtpd_sasl_local_domain = $myhostname smtpd_sasl_path = private/dovecot-auth smtpd_sasl_security_options = noanonymous smtpd_sasl_type = dovecot smtpd_tls_auth_only = yes smtpd_tls_cert_file = /etc/ssl/certs/ssl-mail.pem smtpd_tls_key_file = /etc/ssl/private/ssl-mail.key smtpd_tls_mandatory_ciphers = medium smtpd_tls_mandatory_protocols = SSLv3, TLSv1 smtpd_tls_received_header = yes smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache smtpd_use_tls = yes tls_random_source = dev:/dev/urandom transport_maps = hash:/etc/postfix/transport root@dur:~# root@dur:~# tail /var/log/mail.log Aug 28 02:05:15 dur postfix/smtpd[20326]: connect from localhost[127.0.0.1] Aug 28 02:06:10 dur postfix/smtpd[20326]: warning: hash:/var/lib/mailman/data/aliases is unavailable. open database /var/lib/mailman/data/aliases.db: No such file or directory Aug 28 02:06:10 dur postfix/smtpd[20326]: warning: hash:/var/lib/mailman/data/aliases lookup error for "thufir@localhost" Aug 28 02:06:10 dur postfix/smtpd[20326]: NOQUEUE: reject: RCPT from localhost[127.0.0.1]: 451 4.3.0 <thufir@localhost>: Temporary lookup failure; from=<[email protected]> to=<thufir@localhost> proto=ESMTP helo=<fqdn_test> Aug 28 02:06:23 dur postfix/smtpd[20326]: warning: hash:/var/lib/mailman/data/aliases is unavailable. open database /var/lib/mailman/data/aliases.db: No such file or directory Aug 28 02:06:23 dur postfix/smtpd[20326]: warning: hash:/var/lib/mailman/data/aliases lookup error for "[email protected]" Aug 28 02:06:23 dur postfix/smtpd[20326]: NOQUEUE: reject: RCPT from localhost[127.0.0.1]: 451 4.3.0 <[email protected]>: Temporary lookup failure; from=<[email protected]> to=<[email protected]> proto=ESMTP helo=<fqdn_test> Aug 28 02:06:28 dur postfix/smtpd[20326]: disconnect from localhost[127.0.0.1] Aug 28 02:06:49 dur dovecot: pop3-login: Login: user=<thufir>, method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, mpid=20338, TLS Aug 28 02:06:49 dur dovecot: pop3(thufir): Disconnected: Logged out top=0/0, retr=0/0, del=0/0, size=0 root@dur:~# The manual page is here.

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  • Oracle VM at the IOUG Virtualization SIG – Online Symposium

    - by Chris Kawalek
    Join the Oracle VM product managers and product experts for a day full of best practices and information on the latest product updates. A sampling of what you can expect: Best practices from a customer’s perspective on deployment of Oracle VM and Oracle RAC. How to simplify and accelerate the onboarding of your applications to the cloud with Oracle Virtual Assemblies and Enterprise Manager 12c. The latest how-to and demo of DeployCluster Tool on Oracle VM 3. Date: Tomorrow, November 7th, 10am CDT – 2:50pm CDT Register for this free online event today! 

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  • Table and Column Checksums

    - by Ricardo Peres
    Following my last posts on Change Data Capture and Change Tracking, here is another tip regarding tracking changes: table and colum checksums. The concept is: each time a column value changes, the checksum also changes. You can use this simple method to see if a table has changed very easily, however, beware, different column values may generate the same checksum. Here's the SQL: -- table checksum SELECT CHECKSUM_AGG(BINARY_CHECKSUM(*)) FROM TableName -- column checksum SELECT CHECKSUM_AGG(BINARY_CHECKSUM(ColumnName)) FROM TableName -- integer column checksum SELECT CHECKSUM_AGG(IntegerColumnName) FROM TableName Here are the reference links on the CHECKSUM, CHECKSUM_AGG and BINARY_CHECKSUM functions: CHECKSUM CHECKSUM_AGG BINARY_CHECKSUM SyntaxHighlighter.config.clipboardSwf = 'http://alexgorbatchev.com/pub/sh/2.0.320/scripts/clipboard.swf'; SyntaxHighlighter.brushes.Xml.aliases = ['xml']; SyntaxHighlighter.all();

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  • Will you be at the PASS Summit?

    - by KKline
    Don't forget about the cool services from SQL Sentry for Summiteers, like the free area shuttle and the printed area maps ! Details are in a 5-part series by our CEO, Greg Gonzalez, at http://greg.blogs.sqlsentry.net/ . Are you coming to Charlotte next week for the PASS Summit ? Let's connect! When ever it's open, I'll be in the Exhibit Hall at the SQL Sentry booth unless I'm delivering a session or something of that nature. Here's the sessions I've got on the calendar - Tue, Oct 15: First-timers...(read more)

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  • Participating in 3 SQL events in 8 days

    - by AaronBertrand
    Well, 8 days not including lead and lag travel time. A quick summary of the three events, and the flights it took to get me to each: SQL Saturday #105 - Dublin, Ireland Flights on March 21st: Providence -> Philadelphia (236 miles) Philadelphia -> Dublin (3,260 miles) Time zone change: +4 when we got there, plus Daylight Saving Time kicked in, so +5 after the event. I spoke at this event, and manned the SQL Sentry booth with cohort Scott Fallen. This event was a fantastic SQL Saturday - very...(read more)

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  • How do I choose which way to enable/disable, start/stop, or check the status of a service?

    - by Glyph
    If I want to start a system installed service, I can do: # /etc/init.d/some-svc start # initctl start some-svc # service some-svc start # start some-svc If I want to disable a service from running at boot, I can do: # rm /etc/rc2.d/S99some-svc # update-rc.d some-svc disable # mv /etc/init/some-svc.conf /etc/init/some-svc.conf.disabled Then there are similarly various things I can do to enable services for starting at boot, and so on. I'm aware of the fact that upstart is a (relatively) new thing, and I know about how SysV init used to work, and I'm vaguely aware of a bunch of D-Bus nonsense, but what I don't know is how one is actually intended to interface with this stuff. For example, I don't know how to easily determine whether a service is an Upstart job or a legacy SysV thing, without actually reading through the source of its shell scripts extensively. So: if I want to start or stop a service, either at the moment or persistently, which of these tools should I use, and why? If the answer depends on some attribute (like "this service supports upstart") then how do I quickly and easily learn about that attribute of an installed package? Relatedly, are there any user interface tools which can safely and correctly interact with the modern service infrastructure (upstart, and/or whatever its sysv compatibility is)? For example, could I reliably use sysv-rc-conf to determine which services should start?

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  • Possible problems in a team of programmers [on hold]

    - by John
    I am a "one man team" ASP.NET C#, SQL, HTML, JQuery programmer that wants to split workload with two other guys. Since I never actually thought of possible issue in a team of programmer, there are actually quite a few that came to my mind. delegating tasks (who works on what which is also very much related to security). I found Team Foundation Service could be helpful with this problem and started reading about it. Are there any alternatives? security (do now want for original code to be reused outside the project) How to prevent programmers from having access to all parts of code, and how to prevent them from using that code outside of project? Is trust or contract the only way?

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  • Synchronise Database between servers via php [closed]

    - by Emmanuel
    Hi Guys, I'm needing to synchronise two mysql databases between different servers on a regular basis, by a client-initiated interface. I've been doing it by remote MYSQL connection, and adding the IP of the servers to the whitelist for MYSQL remote connections. Problem is however, that the client has a dynamic IP, so as soon as it changes they can no longer sync. So I'm trying to find an alternative way of synchronising the two databases via some sort of secure php script.

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  • IIS 7 - floats returning with commas instead of periods

    - by cc0
    I'm having trouble reading rows with float values, because these rows return for example 12,34 instead of 12.34 as it should. I suspect this is because both my IIS and SQL server is on a Norwegian Windows Server 2008. So I went to the regional settings and customized the default decimal symbol, then restarted my servers. The output in the database now shows the period decimal symbol, but when I request it through the IIS server it comes comma separated (the IIS server is on another computer, but that also has the default decimal symbol set to period). The IIS server is IIS7 and the SQL Server is 2008 Does anyone have any idea how to fix this? Any help would be greatly appreciated.

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  • atftp pcre pattern

    - by CE-SA
    I've a question about the package named 'atftp'. I've got the atftp daemon finally working. Previously I was using tftp-hpa with a custom rule that replaces filenames with capitals into non-capital filenames and replaces the backslashes into forward slashes so that WinPE will boot fine. But in atftp I can't find rules or replacements like that. I'm searching for long, but cannot find or write the right pcre-pattern. Could you help me with this?

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  • What's Bringing SharePoint 2007 Server to a hault?

    - by juanlarios
    I've been having issues with my teste environment and I'm hoping someone has run into this problem and can point me in the right direction. I noticed: SharePoint Server Memory is through the roof at times and so is the CPU usage. Most of CPU usage is a sql proccess. Running out of disk space all the time. I looked in the Logs located in the 12 hive and sure enough I have 1G log files that are hard to open because of the size. The following are the 3 error messages that are flooding my SharePoint logs:   04/05/2010 16:02:36.99     OWSTIMER.EXE (0x0B94)                       0x0BA4    Windows SharePoint Services       Timer                             5uuf    Monitorable    The previous instance of the timer job 'Variations Propagate Page Job Definition', id '{F9A73EB4-90FE-4574-AD99-B4034056F915}' for service '{F89169F9-707B-4588-9ED0-E6D399FE5E3D}' is still running, so the current instance will be skipped.  Consider increasing the interval between jobs.    04/05/2010 15:59:51.51     OWSTIMER.EXE (0x0B94)                       0x0BA4    Windows SharePoint Services       Timer                             5uuf    Monitorable    The previous instance of the timer job 'Profile Synchronization', id '{A05E3439-8DCD-449A-9D9E-46D601CACAA2}' for service '{F89169F9-707B-4588-9ED0-E6D399FE5E3D}' is still running, so the current instance will be skipped.  Consider increasing the interval between jobs.     04/05/2010 15:56:25.53     OWSTIMER.EXE (0x0B94)                       0x0BA4    Windows SharePoint Services       Timer                             5uuf    Monitorable    The previous instance of the timer job 'Scheduled Unpublish', id '{6298F93F-388D-46B9-809E-CEDBB8659661}' for service '{F89169F9-707B-4588-9ED0-E6D399FE5E3D}' is still running, so the current instance will be skipped.  Consider increasing the interval between jobs.     04/05/2010 15:54:14.73     OWSTIMER.EXE (0x0B94)                       0x0BA4    Windows SharePoint Services       Timer                             5uuf    Monitorable    The previous instance of the timer job 'Config Refresh', id '{C42DA970-3DA3-4AA2-94E5-8499C5B80A3E}' for service '{7F6D2CBE-8071-4A30-B313-7C9989FC2D87}' is still running, so the current instance will be skipped.  Consider increasing the interval between jobs.       I'm googling around but haven't found much. I know one other person posted something about this back in 2008, but no answers were reached. I have already checked the databases to see if any of them have gone offline for whatever reason, but from SQL everything is fine. I recently re-created an SSP and deleted an old ssp. So I thought maybe that was causing it, and who knows? maybe that causes some of the problems or maybe all. I'm running configuration wizard and see if anything changes. Please if someone has had similar issues let me know.

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  • Could someone help me understand SQL TDE Database encryption?

    - by SLC
    I don't quite follow how it works. According to the MSDN Article there is a big hierarchy of keys protecting other keys and passwords. At some point the database is encrypted. You query the database which is encrypted, and it works seamlessly. If you're able to simply connect to the database as normal and not have to worry about any of the encryption from a developer point of view, how exactly is it secure? Surely anyone can simply connect and do select * from x and the data is revealed. Sorry my question is a bit scattered, I am just very confused by the article.

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  • Maximum Length Of IP Address: 15 (IPv4) & 39(IPv6)

    - by Gopinath
    Problem You are designing a database table for a web application that requires to store IP address of users who visits the site. The IP address is required to be stored a character data in the table. To define size of the character column you need to know maximum length of IP address. So, what is the maximum length of an IP address? Solution The IPv4 version of IP address is in the following format 255.255.255.255 To store IPv4 address we require 15 characters. The IPv6 version of IP address is grouped into sets of 4 hex digits separated by colons, like the below 2001:0db8:85a3:0000:0000:8a2e:0370:7334 To store IPv6 address you require a 39 characters long column. Conclusion As IPv4 and IPv6 are the commonly use protocols, you better define a column with 39 characters length so that both the format address are saved in to the table without any issues. This article titled,Maximum Length Of IP Address: 15 (IPv4) & 39(IPv6), was originally published at Tech Dreams. Grab our rss feed or fan us on Facebook to get updates from us.

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  • Why does linux-image-virtual depend on a generic kernel now?

    - by ændrük
    The linux-image-virtual metapackage has historically provided a kernel that is specifically designed for use in virtual machines: Ubuntu 8.04: linux-image-2.6.24-32-virtual Ubuntu 10.04: linux-image-2.6.32-44-virtual Ubuntu 11.10: linux-image-3.0.0-26-virtual Ubuntu 12.04: linux-image-3.2.0-32-virtual Apparently, this has now changed: Ubuntu 12.10: linux-image-3.5.0-17-generic What's the explanation? Is this still the correct kernel to use in a virtual machine?

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  • What criteria would I use SQL Stream Insight vs TPL Dataflow [closed]

    - by makerofthings7
    There is an add-in to the Task Parallel Library (TPL) called TPL Dataflow that allows a variety of data processing scenarios. It seems that there are some parallels to the SQL Stream Insight product, however since SQL's Stream Insight has some interesting licensing around it, and it has a better performance depending on what license I get... I found myself asking myself should I use TPL Dataflow and not have any licensing issues, and possibly better performance. Can anyone tell me if performance is a valid criteria for comparing SQL Stream Insight vs TPL Dataflow? What other criteria should I be looking at when comparing the two?

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  • Rebuilding CoasterBuzz, Part II: Hot data objects

    - by Jeff
    This is the second post, originally from my personal blog, in a series about rebuilding one of my Web sites, which has been around for 12 years. More: Part I: Evolution, and death to WCF After the rush to get moving on stuff, I temporarily lost interest. I went almost two weeks without touching the project, in part because the next thing on my backlog was doing up a bunch of administrative pages. So boring. Unfortunately, because most of the site's content is user-generated, you need some facilities for editing data. CoasterBuzz has a database full of amusement parks and roller coasters. The entities enjoy the relationships that you would expect, though they're further defined by "instances" of a coaster, to define one that has moved between parks as one, with different names and operational dates. And of course, there are pictures and news items, too. It's not horribly complex, except when you have to account for a name change and display just the newest name. In all previous versions, data access was straight SQL. As so much of the old code was rooted in 2003, with some changes in 2008, there wasn't much in the way of ORM frameworks going on then. Let me rephrase that, I mostly wasn't interested in ORM's. Since that time, I used a little LINQ to SQL in some projects, and a whole bunch of nHibernate while at Microsoft. Through all of that experience, I have to admit that these frameworks are often a bigger pain in the ass than not. They're great for basic crud operations, but when you start having all kinds of exotic relationships, they get difficult, and generate all kinds of weird SQL under the covers. The black box can quickly turn into a black hole. Sometimes you end up having to build all kinds of new expertise to do things "right" with a framework. Still, despite my reservations, I used the newer version of Entity Framework, with the "code first" modeling, in a science project and I really liked it. Since it's just a right-click away with NuGet, I figured I'd give it a shot here. My initial effort was spent defining the context class, which requires a bit of work because I deviate quite a bit from the conventions that EF uses, starting with table names. Then throw some partial querying of certain tables (where you'll find image data), and you're splitting tables across several objects (navigation properties). I won't go into the details, because these are all things that are well documented around the Internet, but there was a minor learning curve there. The basics of reading data using EF are fantastic. For example, a roller coaster object has a park associated with it, as well as a number of instances (if it was ever relocated), and there also might be a big banner image for it. This is stupid easy to use because it takes one line of code in your repository class, and by the time you pass it to the view, you have a rich object graph that has everything you need to display stuff. Likewise, editing simple data is also, well, simple. For this goodness, thank the ASP.NET MVC framework. The UpdateModel() method on the controllers is very elegant. Remember the old days of assigning all kinds of properties to objects in your Webforms code-behind? What a time consuming mess that used to be. Even if you're not using an ORM tool, having hydrated objects come off the wire is such a time saver. Not everything is easy, though. When you have to persist a complex graph of objects, particularly if they were composed in the user interface with all kinds of AJAX elements and list boxes, it's not just a simple matter of submitting the form. There were a few instances where I ended up going back to "old-fashioned" SQL just in the interest of time. It's not that I couldn't do what I needed with EF, it's just that the efficiency, both my own and that of the generated SQL, wasn't good. Since EF context objects expose a database connection object, you can use that to do the old school ADO.NET stuff you've done for a decade. Using various extension methods from POP Forums' data project, it was a breeze. You just have to stick to your decision, in this case. When you start messing with SQL directly, you can't go back in the same code to messing with entities because EF doesn't know what you're changing. Not really a big deal. There are a number of take-aways from using EF. The first is that you write a lot less code, which has always been a desired outcome of ORM's. The other lesson, and I particularly learned this the hard way working on the MSDN forums back in the day, is that trying to retrofit an ORM framework into an existing schema isn't fun at all. The CoasterBuzz database isn't bad, but there are design decisions I'd make differently if I were starting from scratch. Now that I have some of this stuff done, I feel like I can start to move on to the more interesting things on the backlog. There's a lot to do, but at least it's fun stuff, and not more forms that will be used infrequently.

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  • What is a safe ulimit ceiling?

    - by Kaustubh P
    This is the output of ulimit -a core file size (blocks, -c) 0 data seg size (kbytes, -d) unlimited scheduling priority (-e) 0 file size (blocks, -f) unlimited pending signals (-i) 16382 max locked memory (kbytes, -l) 64 max memory size (kbytes, -m) unlimited open files (-n) 1024 pipe size (512 bytes, -p) 8 POSIX message queues (bytes, -q) 819200 real-time priority (-r) 0 stack size (kbytes, -s) 8192 cpu time (seconds, -t) unlimited max user processes (-u) unlimited virtual memory (kbytes, -v) unlimited file locks (-x) unlimited This is a 64bit install, and I would like to increase the max-open files from 1024 to a more heady limit such as 5000. Will that be any problem? Will it cause instability? Thanks.

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  • How to determine the source of a request in a distributed service system?

    - by Kabumbus
    Map/Reduce is a great concept for sorting large quantities of data at once. What to do if you have small parts of data and you need to reduce it all the time? Simple example - choosing a service for request. Imagine we have 10 services. Each provides services host with sets of request headers and post/get arguments. Each service declares it has 30 unique keys - 10 per set. service A: name id ... Now imagine we have a distributed services host. We have 200 machines with 10 services on each. Each service has 30 unique keys in there sets. but now to find to which service to map the incoming request we make our services post unique values that map to that sets. We can have up to or more than 10 000 such values sets on each machine per each service. service A machine 1 name = Sam id = 13245 ... service A machine 1 name = Ben id = 33232 ... ... service A machine 100 name = Ron id = 777888 ... So we get 200 * 10 * 30 * 30 * 10 000 == 18 000 000 000 and we get 500 requests per second on our gateway each containing 45 items 15 of which are just noise. And our task is to find a service for request (at least a machine it is running on). On all machines all over cluster for same services we have same rules. We can first select to which service came our request via rules filter 10 * 30. and we will have 200 * 30 * 10 000 == 60 000 000. So... 60 mil is definitely a problem... I hope to get on idea of mapping 30 * 10 000 onto some artificial neural network alike Perceptron that outputs 1 if 30 words (some hashes from words) from the request are correct or if less than Perceptron should return 0. And I’ll send each such Perceptron for each service from each machine to gateway. So I would have a map Perceptron <-> machine for each service. Can any one tall me if my Perceptron idea is at least “sane”? Or normal people do it some other way? Or if there are better ANNs for such purposes?

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