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  • SQL SERVER Fix : Error : 8501 MSDTC on server is unavailable. Changed database context to publisher

    During configuring replication on one of the server, I received following error. This is very common error and the solution of the same is even simpler.MSDTC on server is unavailable. Changed database context to publisherdatabase. (Microsoft SQL Server, Error: 8501)Solution:Enable Distributed Transaction Coordinator in SQL Server.Method 1:Click on StartControl Panel-Administrative Tools-ServicesSelect the service [...]...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • What is the traditional way to maintain extensibility in a database-driven application like this?

    - by Jsess
    I'm working on a simple application for a game in Java that allows a user to record whether they have collected a given item and how much experience it contains. This will work for multiple item types (weapons, armor) and each will have its own tab with a list of all items that qualify under it. Making changes as new types are added is not such a big deal (if a clothing slot is added, for instance), but new items are added to the game all the time in biweekly patches, and I'm not sure what the traditional/customary way to make sure the application is user-extensible without requiring me to would be. Whether that would be adding a configuration menu that allows users to add news items (new rows to the local SQLite database) or a text file with something similar, but I'm certain there's a well-accepted way to do this that I'm not aware of. I'm new to databases and ignorant of the solution, so what's the professional/futureproof way to do this?

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  • Is it bad to have a very full hard drive on a high traffic database server?

    - by MikeN
    Running an Ubuntu server with MySQL for a high traffic production database server. Nothing else is running on the machine except the MySQL instance. We store daily database backups on the DB server, is there any performance hit or reason why we should keep the hard disk relatively empty? If the disk is filled up to 86%+ with the database and all of the backups, does it hurt performance at all? So would the DB server running with 86-90%+ full capacity perform less well in any way than the server running with only a 10% full disk? The total disk size on the server is over 1 TB so even 10% of the disk should be enough for basic O/S swapping and such.

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  • Do I need to conver the older Access Database, and, if so, how?

    - by octopusgrabbus
    I have an Access 2003 database. When I click on a pivot table, I get this message MS Access There isn't enough memory to complete the Automation object operation on the worksheet object. There is a lot of discussion concerning this message. Here is one link. http://community.spiceworks.com/topic/113228-access-2003-file-pivot-table-issue-when-opening-in-access-2010 But this particular link's explanation doesn't really go into fixing the problem in general, like fixing the pivot tables and getting things all nicely back together in the original Access database. That's why I am also interested in converting the database to 2010 format if that is possible. Are there instructions -- I cannot currently find them and would very much appreciate a link -- on dealing with this problem in a nice stepwise fashion?

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  • What are good/fast methods to pull data from a database using JavaScript?

    - by Yatrix
    I'm pretty new to web technologies and I am creating a filter control that will have cascading controls. We are doing a lot of this through JavaScript and are debating the best route to take to the database. HTTPHandlers, WebServices and Ajax are all being considered (or a combination of them). We want to be able to handle a million rows in theory, so it has to be scalable to at that. We are going through JavaScript as our page must not do post-backs, if your'e wondering. I'm asking from an architectural standpoint, but will take any useful information. Links, control suggestions - anything you have, I'll happily listen to.

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  • How can I retrieve a MS SQL Express Database from a non-booting computer?

    - by Redandwhite
    A client has a very important database that has not been backed up in 6 months. The PC has promptly failed. The Windows directory is corrupt, and the computer will not boot. It had a Microsoft SQL Server Express 2005 database on it. I have access to the hard drive by booting in with an Ubuntu Live CD, but I am not sure if I can find the database. I am not sure what I am looking for, or where to look either. The dead machine had Windows XP on it.

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  • How do I force an exchange database to become "active"?

    - by makerofthings7
    We had a catastrophic failure where all that remains is a single edb file. No backups. No log files. The database that remains is on the "passive" copy. The "active" copy is missing, but the server is active. The Exchange console reports that the edb file needs to be reseeded, however there is no source to reseed from. How do I make the "invalid" database file (missing logs) valid? How do I make exchange recognize this as a valid database to use as a primary?

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  • Oracle Application Express 4.2 disponible en version finale, l'outil de développement pour Oracle Database se recentre sur le mobile

    Oracle Application Express, l'outil de développement rapide d'Oracle est désormais disponible en version 4.2. Cet outil, intégré à Oracle Database sans coût supplémentaire, permet de développer des applications Web exploitant les données d'une base Oracle. Cette mise à jour est très centrée vers le mobile et apporte un certain nombre de nouveautés pour le développement d'application mobile avec APEX. Notons en particulier :Le rendu des applications qui s'adapte pour proposer une interface adaptée au terminal mobile utilisé L'utilisation de jQuery Mobile qui permet la compatibilité sur la majorité des terminaux sans modification La possibilité de créer des graphiques en HTML5 pour les terminaux ne disposant pas de Flash L'utilisation ...

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  • Will taking a job that's web and database related limit my software development opportunities later on?

    - by someone
    I love programming, particularly OOP. My school experience was mostly in Java/OOP, and I had a job for a limited time in Java, Python, and other OOP kind of languages. However, a move necessitated a change in jobs, and what I've ended up with now is a web-development and database intensive job. I may possibly hold this job for several years. My question is, will this limit my choices later on? Will I be able to find another Java / software-development kind of job, or will I be rejected because my experience will be mostly in a different area?

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  • How can I make my Java desktop application to run on different computers in a network locally and updating same mysql database?

    - by JaMpa
    I have developed Java desktop application for registration of students in the computer laboratories in our college, but what I need is to make this application whenever it runs on any computer (Windows XP machines) on the laboratory each and every data filled by the college students goes to the same MySql database (through WAMP server) running on the server machine (Win Server 2003). Also, I need this application to run during booting of windows computers in the laboratory for the purpose when any student tries to switch on any PC in the comp lab before interfacing the desktop icons should sign in through user name and password when he has already registered or signing up in order for getting the access.

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  • Why Remote Desktop Sessions show client internal IP address? [closed]

    - by Varp
    I have Windows Server 2008 r2 with static ip address on WAN interface. I connecting to the server from home from my laptop. Laptop at home is behind nat box. When i connecting to the server from home in Remote Desktop Session Manager i see in client status dialog a local ip address of client behind the nat box not WAN ip address of nat box. I suppose i must see the WAN ip address of the nat box in Remote Desktop Session Manager, isnt it?

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  • Building a simple web app with database? [on hold]

    - by Zooce
    I'm building a simple airline reservation system (web app) for a class. I'm trying to find out where to start learning about implementing and integrating a sql database. User's should be able to search for available flights based on destination and departure cities and the like. A good example would be Google Flights. I'd like to access a data base with all of the flight information and display it within tables on the web page. Admins should be able to modify the databases as well. I've tried to learn about things like Node.js, PHP, and AJAX, but most of the tutorials that I've found have been difficult to understand. Any suggestions would be really appreciated, thanks!

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  • 2014?6???OTN?????????????&????

    - by OTN-J Master
    ??????????????????????????????????????????????????????????????????????????????OTN????????Oracle Database????????????????!????????????????????????????????????????????????????????????????????????????????????·Oracle Database ???????????·??????~?????????????·Oracle Database 12c ?????????·Oracle Real Application Testing?????????????????????????DB?????????????????????????????????????????????????????????????(?!)?????????????!?????????Oracle Database ?????????????2014?6???OTN?????????????&???? [5/28??]???????? ?????? ????? 2014 6?10?(?)13:30~17:30 @ ??????????????IT??????????????????????????????????????????????????????????? ??????????????? ?????????????????????:??????????Internet of Things ??? Java ????:NTT???????M2M?????IoT?????????:?????????????/NEC?/????????????????????? ~???????????! -???????/?????????? ~6?18?(?)15:30 ~17:00 @ ?????????????????(???)6?18?(?)18:30~20:00 @ ?????????????????(???)Oracle10g???SQL????????????????????????????????Oracle???????·????????????????SQL?????????????????????SQL??????????????????????????????????????????????????????????????????????????~!!?????????????????????????~OracleDatabase12c??????????~? 6?18?(?)18:30 ~20:00 @ ?????????? ???? ???????Oracle Database 12c??????????????????????????????????????????????? ????·????·????????????????·???? Oracle Audit Vault and Database Firewall ?????????????????????????????????????????????????????????????????????????????ORACLE MASTER Bronze Oracle Database 12c ?????????????? 6?26?(?)14:30 ~ 16:30 @ ?????????? (??) ???24????????????? ORACLE MASTER??????????!ORACLEMASTER Bronze Oracle Database 12c????????????Bronze ???????????????ORACLE MASTER??????????????????ORACLE MASTER????????12c?????????????????????????

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  • ???????/?????????XML?? ~Oracle????XML~

    - by Yusuke.Yamamoto
    ????? ??:2010/08/25 ??:??????/?? Oracle Database ?XML???????????????????????????????????????????? Oracle Database ?XML???????Oracle Database ? XPath ???Oracle Database ? XQuery ???Oracle Database ????????????XML???????Oracle Database ?XML??????????????????"2?"?????? ????????? ????????????????? http://otndnld.oracle.co.jp/ondemand/otn-seminar/movie/XML2_08251330.wmv http://www.oracle.com/technetwork/jp/content/open-0825-xmlfesta2-251028-ja.pdf

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  • How to do fixed price quote for design sessions?

    - by Shaul
    Normally when I do a system for a customer, I do design sessions on an hourly rate and then come out with a fixed price quotation for the full system development. Now this customer has thrown me a curveball: he doesn't want an hourly rate for design, either - he wants me to quote a fixed price to do all the design, too! Not that he's trying to cheap out, but he doesn't want to be in a situation where the longer design stretches out, the more he has to pay - and I can understand that. For the business layer it was actually not too difficult to work with this, because from his original functional spec I got a good idea of what the core business objects were, and in our design agreement I defined several objects which would be covered by a fixed design price; if any new non-trivial objects were discovered, they would be considered variances, and those would be billed on an hourly rate. So far so good. But when it comes to the UI, things start getting a lot more woolly. How many screens will there be? Don't know yet. What's going to be on each screen? Don't know yet. All we know is that it's a "dashboard" type of system, and there will be a lot of visual reporting involved e.g. gauges, graphs, etc. So maybe make it fixed price per screen design? Not a great definition; he might say that everything is going to be on one screen. Maybe a price per "visual report" design, including ability to slice & dice? Again not so easy - it might be that the entire system is just one report, and all the intelligence is going to go into how to present that segmentation. Anyone have any ideas how to do a fixed price quotation for a UI design like this?

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  • sqlite3-ruby can't make on rvm 1.8.7

    - by Josh Crews
    Upgrading to Rails 3 by starting with RVM 1.8.7. OSX 10.5.8 Output: josh-crewss-macbook:~ joshcrews$ gem install sqlite3-rubyBuilding native extensions. This could take a while...ERROR: Error installing sqlite3-ruby: ERROR: Failed to build gem native extension. /Users/joshcrews/.rvm/rubies/ruby-1.8.7-p174/bin/ruby extconf.rb checking for sqlite3.h... yes checking for sqlite3_libversion_number() in -lsqlite3... yes checking for rb_proc_arity()... no checking for sqlite3_column_database_name()... no checking for sqlite3_enable_load_extension()... no checking for sqlite3_load_extension()... no creating Makefile make gcc -I. -I. -I/Users/joshcrews/.rvm/rubies/ruby-1.8.7-p174/lib/ruby/1.8/i686-darwin9.8.0 -I. -I/usr/local/include -I/opt/local/include -I/usr/include -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE -fno-common -g -O2 -fno-common -pipe -fno-common -O3 -Wall -Wcast-qual -Wwrite-strings -Wconversion -Wmissing-noreturn -Winline -c database.c database.c: In function ‘deallocate’: database.c:17: warning: implicit declaration of function ‘sqlite3_next_stmt’ database.c:17: warning: assignment makes pointer from integer without a cast database.c: In function ‘initialize’: database.c:76: warning: implicit declaration of function ‘sqlite3_open_v2’ database.c:79: error: ‘SQLITE_OPEN_READWRITE’ undeclared (first use in this function) database.c:79: error: (Each undeclared identifier is reported only once database.c:79: error: for each function it appears in.) database.c:79: error: ‘SQLITE_OPEN_CREATE’ undeclared (first use in this function) database.c: In function ‘set_sqlite3_func_result’: database.c:277: error: ‘sqlite3_int64’ undeclared (first use in this function) database.c: In function ‘rb_sqlite3_func’: database.c:311: warning: passing argument 1 of ‘ruby_xcalloc’ as signed due to prototype database.c: In function ‘rb_sqlite3_step’: database.c:378: warning: passing argument 1 of ‘ruby_xcalloc’ as signed due to prototype make: *** [database.o] Error 1 Gem list (these are under RVM, under system I've got lot more gems included the sqlite3-ruby that's worked for 1.5 years) josh-crewss-macbook:~ joshcrews$ gem list *** LOCAL GEMS *** abstract (1.0.0) actionmailer (3.0.0.beta3) actionpack (3.0.0.beta3) activemodel (3.0.0.beta3) activerecord (3.0.0.beta3) activeresource (3.0.0.beta3) activesupport (3.0.0.beta3, 2.3.8) arel (0.3.3) builder (2.1.2) bundler (0.9.25) capybara (0.3.8) configuration (1.1.0) cucumber (0.7.2) cucumber-rails (0.3.1) culerity (0.2.10) database_cleaner (0.5.2) diff-lcs (1.1.2) erubis (2.6.5) ffi (0.6.3) gherkin (1.0.30) i18n (0.4.0, 0.3.7) json_pure (1.4.3) launchy (0.3.5) mail (2.2.1) memcache-client (1.8.3) mime-types (1.16) nokogiri (1.4.2) polyglot (0.3.1) rack (1.1.0) rack-mount (0.6.3) rack-test (0.5.4) rails (3.0.0.beta3) railties (3.0.0.beta3) rake (0.8.7) rdoc (2.5.8) rspec (2.0.0.beta.10, 2.0.0.beta.8) rspec-core (2.0.0.beta.10, 2.0.0.beta.8) rspec-expectations (2.0.0.beta.10, 2.0.0.beta.8) rspec-mocks (2.0.0.beta.10, 2.0.0.beta.8) rspec-rails (2.0.0.beta.10, 2.0.0.beta.8) rubygems-update (1.3.7) selenium-webdriver (0.0.20) spork (0.8.3) term-ansicolor (1.0.5) text-format (1.0.0) text-hyphen (1.0.0) thor (0.13.6) treetop (1.4.8) trollop (1.16.2) tzinfo (0.3.22) webrat (0.7.1) Version of XCode: 3.1.1 My suspicion is it has to do with "-I/Users/joshcrews/.rvm/rubies/ruby-1.8.7-p174/lib/ruby/1.8/i686-darwin9.8.0", because i686-darwin9.8.0 doesnt exist in that file

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  • SQL putting two single quotes around datetime fields and fails to insert record

    - by user82613
    I am trying to INSERT into an SQL database table, but it doesn't work. So I used the SQL server profiler to see how it was building the query; what it shows is the following: declare @p1 int set @p1=0 declare @p2 int set @p2=0 declare @p3 int set @p3=1 exec InsertProcedureName @ConsumerMovingDetailID=@p1 output, @UniqueID=@p2 output, @ServiceID=@p3 output, @ProjectID=N'0', @IPAddress=N'66.229.112.168', @FirstName=N'Mike', @LastName=N'P', @Email=N'[email protected]', @PhoneNumber=N'(254)637-1256', @MobilePhone=NULL, @CurrentAddress=N'', @FromZip=N'10005', @MoveInAddress=N'', @ToZip=N'33067', @MovingSize=N'1', @MovingDate=''2009-04-30 00:00:00:000'', /* Problem here ^^^ */ @IsMovingVehicle=0, @IsPackingRequired=0, @IncludeInSaveologyPlanner=1 select @p1, @p2, @p3 As you can see, it puts a double quote two pairs of single quotes around the datetime fields, so that it produces a syntax error in SQL. I wonder if there is anything I must configure somewhere? Any help would be appreciated. Here is the environment details: Visual Studio 2008 .NET 3.5 MS SQL Server 2005 Here is the .NET code I'm using.... //call procedure for results strStoredProcedureName = "usp_SMMoverSearchResult_SELECT"; Database database = DatabaseFactory.CreateDatabase(); DbCommand dbCommand = database.GetStoredProcCommand(strStoredProcedureName); dbCommand.CommandTimeout = DataHelper.CONNECTION_TIMEOUT; database.AddInParameter(dbCommand, "@MovingDetailID", DbType.String, objPropConsumer.ConsumerMovingDetailID); database.AddInParameter(dbCommand, "@FromZip", DbType.String, objPropConsumer.FromZipCode); database.AddInParameter(dbCommand, "@ToZip", DbType.String, objPropConsumer.ToZipCode); database.AddInParameter(dbCommand, "@MovingDate", DbType.DateTime, objPropConsumer.MoveDate); database.AddInParameter(dbCommand, "@PLServiceID", DbType.Int32, objPropConsumer.ServiceID); database.AddInParameter(dbCommand, "@FromAreaCode", DbType.String, pFromAreaCode); database.AddInParameter(dbCommand, "@FromState", DbType.String, pFromState); database.AddInParameter(dbCommand, "@ToAreaCode", DbType.String, pToAreaCode); database.AddInParameter(dbCommand, "@ToState", DbType.String, pToState); DataSet dstSearchResult = new DataSet("MoverSearchResult"); database.LoadDataSet(dbCommand, dstSearchResult, new string[] { "MoverSearchResult" });

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  • Plesk + Apache + PHP (FastCGI): Constant session permissions problems, conflicts between HTTP / HTTPS

    - by Hans Engel
    I've just moved a collection of sites over to a brand-new server, running Apache 2.2.3, PHP 5.3, and Plesk 10.1.1. I am having problems with file permissions on PHP sessions, which are being stored in /var/lib/php/session. I originally set the permissions like so for this folder: drwxrwx--- 2 apache psacln 8192 Mar 22 23:25 session This worked fine, for HTTP sessions. Files were being saved in that folder with these permissions: -rw------- 1 client1 psacln 0 Mar 22 23:24 sess_507... -rw------- 1 client2 psacln 0 Mar 22 23:25 sess_8o1... The problem, however, is that PHP scripts accessed via HTTPS do not seem to be run by the same client1 or client2 user. I deleted files in the session directory and accessed a login page via HTTPS to see how sessions were being saved when initiated via this protocol: -rw------- 1 apache apache 0 Mar 22 23:25 sess_507... So, for whatever reason, sessions initiated by clients browsing with HTTPS were being saved by apache:apache, while sessions from HTTP clients were saved with someclient:psacln. What I'd like to ask: How can I avoid this problem with session permissions? When sessions are created via unencrypted HTTP and a client visits an HTTPS portion of the site, permission errors are shown, since apache:apache tries to access the session save created by someclient:psacln. The converse is also true. Can I change the user which runs the Apache HTTPS server, via Plesk or the command line? If not, can I have PHP sessions save with rw-rw---- permissions, and then add apache to the psacln group? Any other suggestions on how to fix this issue?

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  • Interview with Lenz Grimmer about MySQL Connect

    - by Keith Larson
    Keith Larson: Thank you for allowing me to do this interview with you.  I have been talking with a few different Oracle ACEs   about the MySQL Connect Conference. I figured the MySQL community might be missing you as well. You have been very busy with Oracle Linux but I know you still have an eye on the MySQL Community. How have things been?Lenz Grimmer: Thanks for including me in this series of interviews, I feel honored! I've read the other interviews, and really liked them. I still try to follow what's going on over in the MySQL community and it's good to see that many of the familiar faces are still around. Over the course of the 9 years that I was involved with MySQL, many colleagues and contacts turned into good friends and we still maintain close relationships.It's been almost 1.5 years ago that I moved into my new role here in the Linux team at Oracle, and I really enjoy working on a Linux distribution again (I worked for SUSE before I joined MySQL AB in 2002). I'm still learning a lot - Linux in the data center has greatly evolved in so many ways and there are a lot of new and exciting technologies to explore. Keith Larson: What were your thoughts when you heard that Oracle was going to deliver the MySQL Connect conference to the MySQL Community?Lenz Grimmer: I think it's testament to the fact that Oracle deeply cares about MySQL, despite what many skeptics may say. What started as "MySQL Sunday" two years ago has now evolved into a full-blown sub-conference, with 80 sessions at one of the largest corporate IT events in the world. I find this quite telling, not many products at Oracle enjoy this level of exposure! So it certainly makes me feel proud to see how far MySQL has come. Keith Larson: Have you had a chance to look over the sessions? What are your thoughts on them?Lenz Grimmer: I did indeed look at the final schedule.The content committee did a great job with selecting these sessions. I'm glad to see that the content selection was influenced by involving well-known and respected members of the MySQL community. The sessions cover a broad range of topics and technologies, both covering established topics as well as recent developments. Keith Larson: When you get a chance, what sessions do you plan on attending?Lenz Grimmer: I will actually be manning the Oracle booth in the exhibition area on one of these days, so I'm not sure if I'll have a lot of time attending sessions. But if I do, I'd love to see the keynotes and catch some of the sessions that talk about recent developments and new features in MySQL, High Availability and Clustering . Quite a lot has happened and it's hard to keep up with this constant flow of new MySQL releases.In particular, the following sessions caught my attention: MySQL Connect Keynote: The State of the Dolphin Evaluating MySQL High-Availability Alternatives CERN’s MySQL “as a Service” Deployment with Oracle VM: Empowering Users MySQL 5.6 Replication: Taking Scalability and High Availability to the Next Level What’s New in MySQL Server 5.6? MySQL Security: Past and Present MySQL at Twitter: Development and Deployment MySQL Community BOF MySQL Connect Keynote: MySQL Perspectives Keith Larson: So I will ask you just like I have asked the others I have interviewed, any tips that you would give to people for handling the long hours at conferences?Lenz Grimmer: Wear comfortable shoes and make sure to drink a lot! Also prepare a plan of the sessions you would like to attend beforehand and familiarize yourself with the venue, so you can get to the next talk in time without scrambling to find the location. The good thing about piggybacking on such a large conference like Oracle OpenWorld is that you benefit from the whole infrastructure. For example, there is a nice schedule builder that helps you to keep track of your sessions of interest. Other than that, bring enough business cards and talk to people, build up your network among your peers and other MySQL professionals! Keith Larson: What features of the MySQL 5.6 release do you look forward to the most ?Lenz Grimmer: There has been solid progress in so many areas like the InnoDB Storage Engine, the Optimizer, Replication or Performance Schema, it's hard for me to really highlight anything in particular. All in all, MySQL 5.6 sounds like a very promising release. I'm confident it will follow the tradition that Oracle already established with MySQL 5.5, which received a lot of praise even from very critical members of the MySQL community. If I had to name a single feature, I'm particularly and personally happy that the precise GIS functions have finally made it into a GA release - that was long overdue. Keith Larson:  In your opinion what is the best reason for someone to attend this event?Lenz Grimmer: This conference is an excellent opportunity to get in touch with the key people in the MySQL community and ecosystem and to get facts and information from the domain experts and developers that work on MySQL. The broad range of topics should attract people from a variety of roles and relations to MySQL, beginning with Developers and DBAs, to CIOs considering MySQL as a viable solution for their requirements. Keith Larson: You will be attending MySQL Connect and have some Oracle Linux Demos, do you see a growing demand for MySQL on Oracle Linux ?Lenz Grimmer: Yes! Oracle Linux is our recommended Linux distribution and we have a good relationship to the MySQL engineering group. They use Oracle Linux as a base Linux platform for development and QA, so we make sure that MySQL and Oracle Linux are well tested together. Setting up a MySQL server on Oracle Linux can be done very quickly, and many customers recognize the benefits of using them both in combination.Because Oracle Linux is available for free (including free bug fixes and errata), it's an ideal choice for running MySQL in your data center. You can run the same Linux distribution on both your development/staging systems as well as on the production machines, you decide which of these should be covered by a support subscription and at which level of support. This gives you flexibility and provides some really attractive cost-saving opportunities. Keith Larson: Since I am a Linux user and fan, what is on the horizon for  Oracle Linux?Lenz Grimmer: We're working hard on broadening the ecosystem around Oracle Linux, building up partnerships with ISVs and IHVs to certify Oracle Linux as a fully supported platform for their products. We also continue to collaborate closely with the Linux kernel community on various projects, to make sure that Linux scales and performs well on large systems and meets the demands of today's data centers. These improvements and enhancements will then rolled into the Unbreakable Enterprise Kernel, which is the key ingredient that sets Oracle Linux apart from other distributions. We also have a number of ongoing projects which are making good progress, and I'm sure you'll hear more about this at the upcoming OpenWorld conference :) Keith Larson: What is something that more people should be aware of when it comes to Oracle Linux and MySQL ?Lenz Grimmer: Many people assume that Oracle Linux is just tuned for Oracle products, such as the Oracle Database or our Engineered Systems. While it's of course true that we do a lot of testing and optimization for these workloads, Oracle Linux is and will remain a general-purpose Linux distribution that is a very good foundation for setting up a LAMP-Stack, for example. We also provide MySQL RPM packages for Oracle Linux, so you can easily stay up to date if you need something newer than what's included in the stock distribution.One more thing that is really unique to Oracle Linux is Ksplice, which allows you to apply security patches to the running Linux kernel, without having to reboot. This ensures that your MySQL database server keeps up and running and is not affected by any downtime. Keith Larson: What else would you like to add ?Lenz Grimmer: Thanks again for getting in touch with me, I appreciated the opportunity. I'm looking forward to MySQL Connect and Oracle OpenWorld and to meet you and many other people from the MySQL community that I haven't seen for quite some time! Keith Larson:  Thank you Lenz!

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  • Is there a way to track data structure dependencies from the database, through the tiers, all the way out to a web page?

    - by Sean Mickey
    When we design applications, we generally end up with the same tiered sets of data structures: A persistent data structure that is described using DDL and implemented as RDBMS tables and columns. A set of domain objects that consist primarily of data structures, usually combined with business-rule level logic, that are implemented in a programming language such as Java. A set of service layer interfaces that directly support use case implementations (which use the domain data structures as parameters), implemented as EJBs or something equivalent in another programming language. UI screens that allow users to C reate, R etrieve, U pdate, and (maybe) D elete all manner of data structures and graphs of data structures, with numerous screens and with multiple UI widgets, all structured to support the same data structures. But if you want to change the data structures in any of these tiers, it always seems extremely difficult to assess the impact(s) the change will have across the application. UML can help, but tracing through diagram after diagram is not a real solution to this problem. The best I have ever seen was a homespun data tracking spreadsheet document that listed all of the data structures and walked the relationships from tier-to-tier. Is there a tool or accepted approach that makes it easy to identify a data structure in any tier and easily obtain a list of all dependent: database table and column data structures domain object data structures service layer interface methods and parameter data structures screen & UI component data structures

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  • SQL SERVER – What is the Maximum Relational Database Size Supported by Single Instance?

    - by Pinal Dave
    I often get asked following question? “How much data SQL Server can handle?” Every single time when I get this question – I ask back following question - “How much data your storage system can handle?” The reason I ask this question back is because in reality for enterprise systems the limitation of storage is no more an issue. The Matter of the fact most of the database is now a days limited by the size of the storage system. SQL Server is enterprise system and it is very mature product. Even though if you still want to know what is the actual limit here is the answer. SQL Server 2008R2, 2012 and 2014 have maximum capacity of 524 PB (Petabyte) in the Enterprise, BI and Standard edition. SQL Server Express has a limitation of 10 GB due to its nature. I guess, now when you look at my question it will make sense that it is all depending on the size of your storage system. I personally believe at this point of time 524 PB is quite a huge data, but we never know after 10 years when we read this blog post, we all may think what was I thinking actually. Reference: Pinal Dave (http://blog.sqlauthority.com) Filed under: PostADay, SQL, SQL Authority, SQL Query, SQL Server, SQL Tips and Tricks, T SQL, Technology

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  • Given a database table where multiple rows have the same values and only the most recent record is to be returned

    - by Jim Lahman
    I have a table where there are multiple records with the same value but varying creation dates.  A sample of the database columns is shown here:   1: select lot_num, to_char(creation_dts,'DD-MON-YYYY HH24:MI:SS') as creation_date 2: from coil_setup 3: order by lot_num   LOT_NUM                        CREATION_DATE        ------------------------------ -------------------- 1435718.002                    24-NOV-2010 11:45:54 1440026.002                    17-NOV-2010 06:50:16 1440026.002                    08-NOV-2010 23:28:24 1526564.002                    01-DEC-2010 13:14:04 1526564.002                    08-NOV-2010 22:39:01 1526564.002                    01-NOV-2010 17:04:30 1605920.003                    29-DEC-2010 10:01:24 1945352.003                    14-DEC-2010 01:50:37 1945352.003                    09-DEC-2010 04:44:22 1952718.002                    25-OCT-2010 09:33:19 1953866.002                    20-OCT-2010 18:38:31 1953866.002                    18-OCT-2010 16:15:25   Notice that there are multiple instances of of the same lot number as shown in bold. To only return the most recent instance, issue this SQL statement: 1: select lot_num, to_char(creation_date,'DD-MON-YYYY HH24:MI:SS') as creation_date 2: from 3: ( 4: select rownum r, lot_num, max(creation_dts) as creation_date 5: from coil_setup group by rownum, lot_num 6: order by lot_num 7: ) 8: where r < 100  LOT_NUM                        CREATION_DATE        ------------------------------ -------------------- 2019416.002                    01-JUL-2010 00:01:24 2022336.003                    06-OCT-2010 15:25:01 2067230.002                    01-JUL-2010 00:36:48 2093114.003                    02-JUL-2010 20:10:51 2093982.002                    02-JUL-2010 14:46:11 2093984.002                    02-JUL-2010 14:43:18 2094466.003                    02-JUL-2010 20:04:48 2101074.003                    11-JUL-2010 09:02:16 2103746.002                    02-JUL-2010 15:07:48 2103758.003                    11-JUL-2010 09:02:13 2104636.002                    02-JUL-2010 15:11:25 2106688.003                    02-JUL-2010 13:55:27 2106882.003                    02-JUL-2010 13:48:47 2107258.002                    02-JUL-2010 12:59:48 2109372.003                    02-JUL-2010 20:49:12 2110182.003                    02-JUL-2010 19:59:19 2110184.003                    02-JUL-2010 20:01:03

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  • flat files vs. RDBMS database, few read/writes, few changes

    - by Bob Lapique
    I have to handle data from long term (years, decades) climate monitoring stations. The data flow usually starts with raw data (voltages, etc.) plus quality check information (pressure, temperature, flow rate, etc.) generally recorded @ 1Hz. Then, the data are assigned a quality flag (human and/or program), processed (apply calibration curves) and flagged. So, we basically end up with 2 datasets : raw and processed data. New data are typically added once a day (~500Ko/day/instrument). Simultaneous queries are not likely to ever happen. I wanted to go for a RDBMS (we have a MySQL server) and have some experience in database design, but the IT guy keeps telling me that flat files will to the job just as well. I suspect him to try to make his life easier when it comes to backup/upgrade the MySQL. There are not so many links between data, they don't change much, but the quality flags will change. A RDBMS is easier to compare data from different instruments on a "many days" scale, compared to daily text files. Well, what would you advise ? Thanks.

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  • You may be tempted by IaaS, but you should PaaS on that or your database cloud journey will be a short one

    - by B R Clouse
    Before we examine Consolidation, the next step in the journey to cloud, let's take a short detour to address a critical choice you will face at the outset of your journey: whether to deploy your databases in virtual machines or not. A common misconception we've encountered is the belief that moving to cloud computing can be accomplished by simply hosting one's current operating environment as-is within virtual machines, and then stacking those VMs together in a consolidated environment.  This solution is often described as "Infrastructure as a Service" (IaaS) because the building block for deployments is a VM, which behaves like a full complement of infrastructure.  This approach is easy to understand and may feel like a good first step, but it won't take your databases very far in the journey to cloud computing.  In fact, if you follow the IaaS fork in the road, your journey will end quickly, without realizing the full benefits of cloud computing.  The better option to is to rationalize the deployment stack so that VMs are needed only for exceptional cases.  By settling on a standard operating system and patch level, you create an infrastructure that potentially all of your databases can share.  Now, the building block will be database instances or possibly schemas within databases.  These components are the platforms on which you will deploy workloads, hence this is known as "Platform as a Service" (PaaS). PaaS opens the door to higher degrees of consolidation than IaaS, because with PaaS you will not need to accommodate the footprint (operating system, hypervisor, processes, ...) that each VM brings with it.  You will also reduce your maintenance overheard if you move forward without the VMs and their O/Ses to patch and monitor.  So while IaaS simply shuffles complex and varied environments into VMs,  PaaS actually reduces complexity by rationalizing to the small possible set of components.  Now we're ready to look at the consolidation options that PaaS provides -- in our next blog posting.

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