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  • Start Daemonised GNU Screen from script a allow calling script to end

    - by tez
    I have a script on an embedded device that calls screen to start if a user logs in via a ssh session... #!/bin/sh SCREENRUNNING=`pgrep SCREEN` if [ -z "$SCREENRUNNING" ]; then echo "Screen not running so let's start the Master session sleep 2 screen -dmS Master sleep 2 screen -x root/Master else echo "Screen is already running let's connect to existing session" sleep 2 screen -x root/Master fi However this keeps the calling script active till the screen session exits,even if it's detached. What I want to do is have the calling script finish and exit while the screen session stays active. I've tried daemonising the screen -x lines and adding an & to the end of the screen -x lines neither of which work properly. Ideas?

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  • BIND: forward 1st level zone

    - by raven
    First of all: sorry for the language, English is not my primary language. I have star-like DNS structure with many filials (more that 2): ^ | v filialNS_1.filial_1.city.local <---- ns.main.city.local <---- filialNS_2.filial_2.city.local ^ | v ns.mail.city.local is slave of all filials zones filialNS_1 is master of filial_1.city.local filialNS_2 is master of filial_2.city.local filialNS_N is master of filial_N.city.local I want to: serve DNS queries for xxx.filial_N.city.local with filialNS_N.filial_N.city.local forward all queries for xxx.xxx.xxx.local from filialNS_N to ns.main.city.local forward other queries to our provider's DNS on filial (or google-public-dns or anything else) FILIAL CONFIG named.conf zone "filial_1.city.local" { type master; file "/etc/namedb/dynamic/filial_1.city.local"; allow-update { key DHCP_UPDATER; }; allow-transfer { <ns.main.city.local IP address> }; }; zone "2.76.10.in-addr.arpa" { type master; file "/etc/namedb/dynamic/2.76.10.in-addr.arpa"; allow-update { key DHCP_UPDATER; }; allow-transfer { <ns.main.city.local IP address> }; }; zone "local." { type forward; forward only; forwarders { <ns.main.city.local IP address> }; }; nslookup server.filial_1.city.local - works fine nslookup server.main.city.local Server: 127.0.0.1 Address: 127.0.0.1#53 ** server can't find server.main.city.local: NXDOMAIN Where am I going wrong?

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  • Múltiples clientes en el mismo Oracle UCM

    - by [email protected]
    Estamos muy activos con la implantación de plataformas ECM que den servicio a múltiples clientes. Consiguiendo 2 objetivos muy importantes:El cliente final puede pagar al proveedor por una plataformas ECM como servicio (SaaS). Y, lógicamente, se ahorra en complejidad y gastos de infraestructura, administración, formación, almacenamiento, etc...Hemos estado explicando estos días el modelo Master-Proxy de Oracle UCM con el que podemos implantar este tipo de plataformas. No siempre será la solución más adecuada porque a veces vamos a querer disponer de plataformas compartidas, pero con clientes completamente aislados. Siempre, la consola de migración nos permite exportar e importar componentes, metadatos, contenidos, workflows, etc... para que elijamos el modelo más adecuado para cada caso.Pero, ¿Cómo funciona?. Podéis ver en la imágen que se basa en la instalación de varias instancias de UCM y configurarlas de forma que varias de ellas se comporten como "Master" (digo varias para conseguir alta disponibilidad), y el resto se comporten como "Proxy" (también varias instancias de UCM pueden comportarse como un mismo "Proxy" permitiendo balancear la carga en función de que cada cliente requiera más o menos rendimiento). Esta configuración (que vemos en la imágen adjunta), nos permite:Delegar la gestión de usuarios de cada cliente. Los usuarios del Master podrán acceder a todos los Proxies, pero los usuarios de cada proxy sólo acceden a su repositorio.Delegar funcionalidad y componentes. Es posible configurar diferentes funcionalidades en cada proxy de forma que algunos servidores estén especializados en Web Content Management, otros en Document Management (por ejemplo).Diferentes modelos de metadatos. Podemos modelar unos tipos documentales generales para toda la plataforma y otros particulares diferentes en cada UCM "Proxy".Conseguir una centralización de búsquedas y acceso a repositorios de documentación con diferentes juegos de caracteres. Un UCM Master puede centralizar la búsqueda en UCM's proxy que alberguen documentación en diferentes juegos de caracteres (por ejemplo un UCM para documentación de idiomas "Western European" (inglés, español, francés, alemán,...) y otro UCM proxy bajo juego de caracteres "Asian" (japones, coreano, chino,...).Fuentes:Toda la información detallada se encuentra en la documentación de Oracle UCM, aquí:http://download.oracle.com/docs/cd/E10316_01/ouc.htmY en concreto, lo relativo a plataformas, en el documento "Planning and Implementation Guide", aquí:plan_implement_guide_10en.pdf

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  • Reading and conditionally updating N rows, where N > 100,000 for DNA Sequence processing

    - by makerofthings7
    I have a proof of concept application that uses Azure tables to associate DNA sequences to "something". Table 1 is the master table. It uniquely lists every DNA sequence. The PK is a load balanced hash of the RK. The RK is the unique encoded value of the DNA sequence. Additional tables are created per subject. Each subject has a list of N DNA sequences that have one reference in the Master table, where N is 100,000. It is possible for many tables to reference the same DNA sequence, but in this case only one entry will be present in the Master table. My Azure dilemma: I need to lock the reference in the Master table as I work with the data. I need to handle timeouts, and prevent other threads from overwriting my data as one C# thread is working with the information. Other threads need to realise that this is locked, and move onto other unlocked records and do the work. Ideally I'd like to get some progress report of how my computation is going, and have the option to cancel the process (and unwind the locks). Question What is the best approach for this? I'm looking at these code snippets for inspiration: http://blogs.msdn.com/b/jimoneil/archive/2010/10/05/azure-home-part-7-asynchronous-table-storage-pagination.aspx http://stackoverflow.com/q/4535740/328397

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  • Backup those keys, citizen

    - by BuckWoody
    Periodically I back up the keys within my servers and databases, and when I do, I blog a reminder here. This should be part of your standard backup rotation – the keys should be backed up often enough to have at hand and again when they change. The first key you need to back up is the Service Master Key, which each Instance already has built-in. You do that with the BACKUP SERVICE MASTER KEY command, which you can read more about here. The second set of keys are the Database Master Keys, stored per database, if you’ve created one. You can back those up with the BACKUP MASTER KEY command, which you can read more about here. Finally, you can use the keys to create certificates and other keys – those should also be backed up. Read more about those here. Anyway, the important part here is the backup. Make sure you keep those keys safe! Share this post: email it! | bookmark it! | digg it! | reddit! | kick it! | live it!

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  • MaaS minimum requirements with juju-jitsu?

    - by Christopher Shen Mu Long
    I've browsed through so many different sites and found so much contradictory information. As I am getting tired of this and do belive this question affects many other users, so I would like to collect the "once and for all times" answer. Unfortunately, the documentation on MaaS and Juju is ... well, not the best, sorry to say that. What are the minimum system requirements for setting up a MaaS cluster, which is going to be orchestrated with juju-jitsu? Do they need to have the exact system specifications or can I just combine different hardware? What are the minimum requirements for the master machine? E.g. "You need at least 8GB of RAM, a dual core CPU with at least 3.0 GHz." How many machines to I need to deploy MaaS on? I've read six machines, nine machines, and so on. I clearly want to know: "You need one for the Master and e.g. five nodes." Do I need to attach as many NICs (network interface cards) to my master machine as there are nodes, or can I simply attach two NICs and a switch? One NIC for connecting to the internet, one for handling the MaaS tasks, connected to a switch, which connects my nodes to the master? Is Juju now ready for local deployment? The last time I experimented with juju and had to reboot my machine, the services orchestrated by juju were gone. This was an issue I also found on the official juju site. Unfortunately, as mentioned above, the documentation is not the best, so I could not find the necessary info on that again. So: Can I use juju on a local environment or will a reboot break my setup?

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  • Loadbalancing Questions

    - by Van Holtz
    I have been learning networking for about 4 months. Wrote a single standalone Multiplayer server and succeeded with authoritative approach. Now I want to extend it by splitting the single server into clusters to allow even more players to log in to avoid latency issues. Now I have protyped the Loadbalancing server and its running pretty good so far. This is my architecture, I have a master server which acts as a proxy, every sub servers(chat, login, game) connect to the master server as well as all the clients. when a client connects, Client Request: Send Request - MS(Master) - Decides which SS(SubServer) to forward to - Forwards Request to SS - SS - Analyze Message - Send Response to MS - Decides which Client to forward to - Forwards Response to Client Well, it looks like its going through lots of stages. it takes double the time to process the message than a single server approach. i feel like my model isnt the best or i may be wrong. is there any better model or the one they use in professional games? I still want a Master-SubServer approach. I just want to clarify that I'm going in the right direction before writing all my codes. Thanks for any answer :)

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  • Maintaining Two Separate Software Versions From the Same Codebase in Version Control

    - by Joseph
    Let's say that I am writing two different versions of the same software/program/app/script and storing them under version control. The first version is a free "Basic" version, while the second is a paid "Premium" version that takes the codebase of the free version and expands upon it with a few extra value-added features. Any new patches, fixes, or features need to find their way into both versions. I am currently considering using master and develop branches for the main codebase (free version) along side master-premium and develop-premium branches for the paid version. When a change is made to the free version and merged to the master branch (after thorough testing on develop of course), it gets copied over to the develop-premium branch via the cherry-pick command for more testing and then merged into master-premium. Is this the best workflow to handle this situation? Are there any potential problems, caveats, or pitfalls to be aware of? Is there a better branching strategy than what I have already come up with? Your feedback is highly appreciated! P.S. This is for a PHP script stored in Git, but the answers should apply to any language or VCS.

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  • Complex string matching with fuzzywuzzy

    - by That1Guy
    I'm attempting to write a process that matches obscure strings to a single 'master string' for further processing. I have a lot of data that looks something like this: Basketball Basket Ball Football BasketBallR BBall BBall - r FootB ...and so on. These need to be mapped to a master record like so: Basketball = Basket Ball, BBall Basketball - R = BasketBallR, BBall - r I also have instances of data resembling this format: Football -r FootBall - r-g/H,Q,HH These situations need to be separated into different categories before being mapped. For example FootBall - r-g/H,Q,HH should be: Football - r Football - g Football - H Football - Q Football - HH At this point, it still needs to be mapped to a master record... I've tried several different combinations of fuzzywuzzy matching methods, Levenshtein Distance measurements, regex, etc. and can't seem to find a reliable method to logically associate different naming styles of a single item with a master name. I'm throwing my hands up in desperation. Are there any existing python resources than can help sort out my problem? Are there other options? Can anybody point out an obvious option that I might have overlooked? Basically, any suggestion, solution, resource or alternative method is greatly appreciated.

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  • Does Ivy's url resolver support transitive retrieval?

    - by Sean
    For some reason I can't seem to resolve the dependencies of my dependencies when using a url resolver to specify a repository's location. However, when using the ibiblio resolver, I am able to retrieve them. For example: <!-- Ivy File --> <ivy-module version="1.0"> <info organisation="org.apache" module="chained-resolvers"/> <dependencies> <dependency org="commons-lang" name="commons-lang" rev="2.0" conf="default"/> <dependency org="checkstyle" name="checkstyle" rev="5.0"/> </dependencies> </ivy-module> <!-- ivysettings file --> <ivysettings> <settings defaultResolver="chained"/> <resolvers> <chain name="chained"> <url name="custom-repo"> <ivy pattern="http://my.internal.domain.name/ivy/[organisation]/[module]/[revision]/ivy-[revision].xml"/> <artifact pattern="http://my.internal.domain.name/ivy/[organisation]/[module]/[revision]/[artifact]-[revision].[ext]"/> </url> <url name="ibiblio-mirror" m2compatible="true"> <artifact pattern="http://mirrors.ibiblio.org/pub/mirrors/maven2/[organisation]/[module]/[revision]/[artifact]-[revision].[ext]" /> </url> <ibiblio name="ibiblio" m2compatible="true"/> </chain> </resolvers> </ivysettings> <!-- checkstyle ivy.xml file generated from pom via ivy:install task --> <?xml version="1.0" encoding="UTF-8"?> <ivy-module version="1.0" xmlns:m="http://ant.apache.org/ivy/maven"> <info organisation="checkstyle" module="checkstyle" revision="5.0" status="release" publication="20090509202448" namespace="maven2" > <license name="GNU Lesser General Public License" url="http://www.gnu.org/licenses/lgpl.txt" /> <description homepage="http://checkstyle.sourceforge.net/"> Checkstyle is a development tool to help programmers write Java code that adheres to a coding standard </description> </info> <configurations> <conf name="default" visibility="public" description="runtime dependencies and master artifact can be used with this conf" extends="runtime,master"/> <conf name="master" visibility="public" description="contains only the artifact published by this module itself, with no transitive dependencies"/> <conf name="compile" visibility="public" description="this is the default scope, used if none is specified. Compile dependencies are available in all classpaths."/> <conf name="provided" visibility="public" description="this is much like compile, but indicates you expect the JDK or a container to provide it. It is only available on the compilation classpath, and is not transitive."/> <conf name="runtime" visibility="public" description="this scope indicates that the dependency is not required for compilation, but is for execution. It is in the runtime and test classpaths, but not the compile classpath." extends="compile"/> <conf name="test" visibility="private" description="this scope indicates that the dependency is not required for normal use of the application, and is only available for the test compilation and execution phases." extends="runtime"/> <conf name="system" visibility="public" description="this scope is similar to provided except that you have to provide the JAR which contains it explicitly. The artifact is always available and is not looked up in a repository."/> <conf name="sources" visibility="public" description="this configuration contains the source artifact of this module, if any."/> <conf name="javadoc" visibility="public" description="this configuration contains the javadoc artifact of this module, if any."/> <conf name="optional" visibility="public" description="contains all optional dependencies"/> </configurations> <publications> <artifact name="checkstyle" type="jar" ext="jar" conf="master"/> </publications> <dependencies> <dependency org="antlr" name="antlr" rev="2.7.6" force="true" conf="compile->compile(*),master(*);runtime->runtime(*)"/> <dependency org="apache" name="commons-beanutils-core" rev="1.7.0" force="true" conf="compile->compile(*),master(*);runtime->runtime(*)"/> <dependency org="apache" name="commons-cli" rev="1.0" force="true" conf="compile->compile(*),master(*);runtime->runtime(*)"/> <dependency org="apache" name="commons-logging" rev="1.0.3" force="true" conf="compile->compile(*),master(*);runtime->runtime(*)"/> <dependency org="com.google.collections" name="google-collections" rev="0.9" force="true" conf="compile->compile(*),master(*);runtime->runtime(*)"/> </dependencies> </ivy-module> Using the "ibiblio" resolver I have no problem resolving my project's two dependencies (commons-lang 2.0 and checkstyle 5.0) and checkstyle's dependencies. However, when attempting to exclusively use the "custom-repo" or "ibiblio-mirror" resolvers, I am able to resolve my project's two explicitly defined dependencies, but not checkstyle's dependencies. Is this possible? Any help would be greatly appreciated.

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  • Cannot install passenger with Nginx

    - by Luc
    Hello, I have a rack application that I want to migrate from Ruby 1.8.7 + Apache + passenger to Ruby 1.9.1 + Nginx + passenger. I have made up the following script for a quick install all in one, and it raises an error... Here is the installation script: (basic one with all the steps I need to install everything on a Ubuntu 10.04 Lucid Lynx fresh box) Nginx sources cd /tmp wget http://nginx.org/download/nginx-0.7.66.tar.gz tar xzf nginx-0.7.66.tar.gz cd nginx-0.7.66 openssl required for SSL/TLS sudo apt-get install openssl sudo apt-get install libssl-dev Compilation stuff sudo apt-get zlib1g-dev Ruby interpreter 1.9.1 sudo apt-get install ruby1.9.1 ruby1.9.1-dev rubygems1.9.1 irb1.9.1 ri1.9.1 rdoc1.9.1 build-essential nginx libopenssl-ruby1.9.1 Make sure default ruby uses version 1.9.1 sudo update-alternatives --install /usr/bin/ruby ruby /usr/bin/ruby1.9.1 400 --slave /usr/share/man/man1/ruby.1.gz ruby.1.gz /usr/share/man/man1/ruby1.9.1.1.gz --slave /usr/bin/ri ri /usr/bin/ri1.9.1 --slave /usr/bin/irb irb /usr/bin/irb1.9.1 --slave /usr/bin/rdoc rdoc /usr/bin/rdoc1.9.1 sudo update-alternatives --config ruby Passenger (rake-0.8.7, fastthread-1.0.7, rack-1.1.0, passenger-2.2.14) sudo gem install passenger Activate Passenger in nginx, select option 2 to use nginx sources donwloaded above cd /var/lib/gems/1.9.1/gems/passenger-2.2.14/bin sudo ./passenger-install-nginx-module And this is the error message I got: /var/lib/gems/1.9.1/gems/passenger-2.2.14/ext/nginx/ContentHandler.c gcc -c -pipe -O -W -Wall -Wpointer-arith -Wno-unused-parameter -Wunused-function -Wunused-variable -Wunused-value -Werror -g -I src/core -I src/event -I src/event/modules -I src/os/unix -I /tmp/pcre-8.00 -I objs -I src/http -I src/http/modules -I src/mail \ -o objs/addon/nginx/StaticContentHandler.o \ /var/lib/gems/1.9.1/gems/passenger-2.2.14/ext/nginx/StaticContentHandler.c /var/lib/gems/1.9.1/gems/passenger-2.2.14/ext/nginx/StaticContentHandler.c: In function ‘passenger_static_content_handler’: /var/lib/gems/1.9.1/gems/passenger-2.2.14/ext/nginx/StaticContentHandler.c:71: error: ‘ngx_http_request_t’ has no member named ‘zero_in_uri’ make[1]: *** [objs/addon/nginx/StaticContentHandler.o] Error 1 make[1]: Leaving directory `/tmp/nginx-0.7.66' make: *** [build] Error 2 -------------------------------------------- It looks like something went wrong Please read our Users guide for troubleshooting tips: /var/lib/gems/1.9.1/gems/passenger-2.2.14/doc/Users guide Nginx.html I do not understand the reason of this error. Is this a compatibility problem ? Hope you have any clues :) Thanks a lot, Luc

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  • OpenLDAP Replication problem

    - by ramesh.mimit
    Hello Folks, I have a LDAP master server installed on CentOS-5.4 and I have installed LDAP on one more machine and I want it be configured as LDAP slave server but when I am importing the LDIF file or trying to create any new object in slave LDAP getting the below errors: LDIF text import Could not add object dc=transcomus,dc=com LDAP said: Server is unwilling to perform Error number: 0x35 (LDAP_UNWILLING_TO_PERFORM) Description: The LDAP server refused to perform the operation. There is no permission issue already checked that on /var/lib/ldap Any help much appreciate.. Thanks Ramesh

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  • Can I set up an "involuntary" conference call with Freeswitch?

    - by Atilla Filiz
    I am trying to set up a SIP/RTP public announcement infrastructure. Basically there are several slave user agents that are configured to answer automatically, and a master UA which should be able to call all of them and make announcements. A way to work around seems creating a conference and making all UAs to join via some RPC mechanism but I don't want to go that direction unless I have to. The slave UAs are linphone and I haven't decided on the master agent yet.

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  • Tae Kwon Do in Overland Park

    - by [C.B.W]
    If you are in the Overland Park area and are in need of some physical recreation (and who isn’t) I have to recommend Master’s Tae Kwon Do in Overland Park KS . Master Tom is an 8th Dan teaching Tae Kwon Do and Hapkido. Yah, he teaches almost all of the classes himself. I used to take ishin ryu but stopped some 12 years ago (seems like yesterday. God I am getting old.)    I had wanted to get back into some type of Martial Arts training and I wanted to get my son involved as well – Master’s Tae Kwon Do has the best schedule.   My son and I can go to any of the classes together. Tae Kwon Do is a pretty good work out, lots of kicks so gets the blood pumping. Work out and learn how to defend yourself all at one time. Great for those of us short on time.

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  • Enterprise Data Quality - New and Improved on Oracle Technology Network

    - by Mala Narasimharajan
    Looking for Enterprise Data Quality technical and developer resources on your projects? Wondering where the best place is to go for finding the latest documentations, downloads and even code samples and libraries?  Check out the new and improved Oracle Technical Network pages for Oracle Enterprise Data Quality.  This section features developer forums as well for EDQ and Master Data Management so that you can connect with other technical professionals who have submitted concerns or posted tips and tricks and learn from them.  Here are the links to bookmark:    Oracle Technology Network website * NEW *   Installation Guide for Enterprise Data Quality Address Verification  Enterprise Data Quality Forum For more information on Oracle's software offerings for data quality and master data management visit:  http://www.oracle.com/us/products/applications/master-data-management/index.html http://www.oracle.com/us/products/middleware/data-integration/enterprise-data-quality/overview/index.html   

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  • Why can you reference an imported module using the importing module in python

    - by noam
    I am trying to understand why any import can be referenced using the importing module, e.g #module master.py import slave and then >>>import master >>>print master.slave gives <module 'slave' from 'C:\Documents and Settings....'> What is the purpose of the feature? I can see how it can be helpful in a package's __init__.py file, but nothing else. Is it a side effect of the fact that every import is added to the module's namespace and that the module's namespace is visible from the outside? If so, why didn't they make an exception with data imported from other modules (e.g don't show it as part of the module's namespace for other modules)?

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  • extrapolating object state based on updates

    - by user494461
    I have a networked multi-user collaborative application. To maintain a consistent virtual world, I send updates for objects from a master peer to a guest peer. The update state contains x,y,z coordinates of object center and his rotation matrix(CHAI3d api used a 3x3 matrix) with 30Hz frequency. I want to reduce this update rate and want to send with a reduced update rate. I want a predictor on both peers. When the predicted value is outside, say a error value of 10% in comparison to master peers objects original state the master peer triggers a state update. Now for position I used velocity,position updates so that the guest peer can extrapolate position. Like velocity for position what parameter should I use for rotation extrapolition?

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  • Database IDs

    - by fatherjack
    Just a quick post, mainly to test out the new blog format but related to a question on the #sqlhelp hashtag. The question came from Justin Dearing (@zippy1981) as: So I take it database_id isn’t an ever incrementing value. #sqlhelp When a new database is created it is given the lowest available ID. This either is in a gap in IDs where a database has been dropped or the database ID is incremented by one from the highest current ID if there are no gaps to fill. To see this in action, connect to your sandbox server and try this: USE MASTER GO CREATE DATABASE cherry GO USE cherry GO SELECT DB_ID() GO CREATE DATABASE grape GO USE grape GO SELECT DB_ID() GO CREATE DATABASE melon GO USE melon GO SELECT DB_ID() GO USE MASTER GO DROP DATABASE grape GO CREATE DATABASE kiwi GO USE kiwi GO SELECT DB_ID() GO USE MASTER GO DROP DATABASE cherry DROP DATABASE melon DROP DATABASE kiwi You should get an incrementing series of database IDs as the databases are created until the last one where the new database gets allocated the ID that is missing because one was dropped.

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  • Useful git commit messages for merged branches

    - by eykanal
    As a follow-up to this question: If I'm working on a team by myself, I can maintain useful commit messages when merging branches by squashing all the commits to a single diff and then merging that diff. That way I can easily see what changes were introduced in the branch, and I have a single summary describing the feature/change/whatever that was accomplished in that branch when browsing the master branch. My question now is, how can I accomplish this when working with a team? In that situation, the branches will be pushed to a remote repository, meaning that I can't squash all the commits in the branch down to a single commit. If the branch is public, can I still have a single useful merge commit in the master branch? (By "useful" I mean that the commit in the master line tells me (1) a useful summary of what was done in the branch and (2) diffs of the same.)

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  • Microsoft Sql Server 2008 R2 System Databases

    For a majority of software developers little time is spent understanding the inner workings of the database management systems (DBMS) they use to store data for their applications.  I personally place myself in this grouping. In my case, I have used various versions of Microsoft’s SQL Server (2000, 2005, and 2008 R2) and just recently learned how valuable they really are when I was preparing to deliver a lecture on "SQL Server 2008 R2, System Databases". Microsoft Sql Server 2008 R2 System DatabasesSo what are system databases in MS SQL Server, and why should I know them? Microsoft uses system databases to support the SQL Server DBMS, much like a developer uses config files or database tables to support an application. These system databases individually provide specific functionality that allows MS SQL Server to function. Name Database File Log File Master master.mdf mastlog.ldf Resource mssqlsystemresource.mdf mssqlsystemresource.ldf Model model.mdf modellog.ldf MSDB msdbdata.mdf msdblog.ldf Distribution distmdl.mdf distmdl.ldf TempDB tempdb.mdf templog.ldf Master DatabaseIf you have used MS SQL Server then you should recognize the Master database especially if you used the SQL Server Management Studio (SSMS) to connect to a user created database. MS SQL Server requires the Master database in order for DBMS to start due to the information that it stores. Examples of data stored in the Master database User Logins Linked Servers Configuration information Information on User Databases Resource DatabaseHonestly, until recently I never knew this database even existed until I started to research SQL Server system databases. The reason for this is due largely to the fact that the resource database is hidden to users. In fact, the database files are stored within the Binn folder instead of the standard MS SQL Server database folder path. This database contains all system objects that can be accessed by all other databases.  In short, this database contains all system views and store procedures that appear in all other user databases regarding system information. One of the many benefits to storing system views and store procedures in a single hidden database is the fact it improves upgrading a SQL Server database; not to mention that maintenance is decreased since only one code base has to be mainlined for all of the system views and procedures. Model DatabaseThe Model database as the name implies is the model for all new databases created by users. This allows for predefining default database objects for all new databases within a MS SQL Server instance. For example, if every database created by a user needs to have an “Audit” table when it is  created then defining the “Audit” table in the model will guarantees that the table will be located in every new database create after the model is altered. MSDB DatabaseThe MSDBdatabase is used by SQL Server Agent, SQL Server Database Mail, SQL Server Service Broker, along with SQL Server. The SQL Server Agent uses this database to store job configurations and SQL job schedules along with SQL Alerts, and Operators. In addition, this database also stores all SQL job parameters along with each job’s execution history.  Finally, this database is also used to store database backup and maintenance plans as well as details pertaining to SQL Log shipping if it is being used. Distribution DatabaseThe Distribution database is only used during replication and stores meta data and history information pertaining to the act of replication data. Furthermore, when transactional replication is used this database also stores information regarding each transaction. It is important to note that replication is not turned on by default in MS SQL Server and that the distribution database is hidden from SSMS. Tempdb DatabaseThe Tempdb as the name implies is used to store temporary data and data objects. Examples of this include temp tables and temp store procedures. It is important to note that when using this database all data and data objects are cleared from this database when SQL Server restarts. This database is also used by SQL Server when it is performing some internal operations. Typically, SQL Server uses this database for the purpose of large sort and index operations. Finally, this database is used to store row versions if row versioning or snapsot isolation transactions are being used by SQL Server. Additionally, I would love to hear from others about their experiences using system databases, tables, and objects in a real world environments.

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  • Microsoft Sql Server 2008 R2 System Databases

    For a majority of software developers little time is spent understanding the inner workings of the database management systems (DBMS) they use to store data for their applications.  I personally place myself in this grouping. In my case, I have used various versions of Microsoft’s SQL Server (2000, 2005, and 2008 R2) and just recently learned how valuable they really are when I was preparing to deliver a lecture on "SQL Server 2008 R2, System Databases". Microsoft Sql Server 2008 R2 System DatabasesSo what are system databases in MS SQL Server, and why should I know them? Microsoft uses system databases to support the SQL Server DBMS, much like a developer uses config files or database tables to support an application. These system databases individually provide specific functionality that allows MS SQL Server to function. Name Database File Log File Master master.mdf mastlog.ldf Resource mssqlsystemresource.mdf mssqlsystemresource.ldf Model model.mdf modellog.ldf MSDB msdbdata.mdf msdblog.ldf Distribution distmdl.mdf distmdl.ldf TempDB tempdb.mdf templog.ldf Master DatabaseIf you have used MS SQL Server then you should recognize the Master database especially if you used the SQL Server Management Studio (SSMS) to connect to a user created database. MS SQL Server requires the Master database in order for DBMS to start due to the information that it stores. Examples of data stored in the Master database User Logins Linked Servers Configuration information Information on User Databases Resource DatabaseHonestly, until recently I never knew this database even existed until I started to research SQL Server system databases. The reason for this is due largely to the fact that the resource database is hidden to users. In fact, the database files are stored within the Binn folder instead of the standard MS SQL Server database folder path. This database contains all system objects that can be accessed by all other databases.  In short, this database contains all system views and store procedures that appear in all other user databases regarding system information. One of the many benefits to storing system views and store procedures in a single hidden database is the fact it improves upgrading a SQL Server database; not to mention that maintenance is decreased since only one code base has to be mainlined for all of the system views and procedures. Model DatabaseThe Model database as the name implies is the model for all new databases created by users. This allows for predefining default database objects for all new databases within a MS SQL Server instance. For example, if every database created by a user needs to have an “Audit” table when it is  created then defining the “Audit” table in the model will guarantees that the table will be located in every new database create after the model is altered. MSDB DatabaseThe MSDBdatabase is used by SQL Server Agent, SQL Server Database Mail, SQL Server Service Broker, along with SQL Server. The SQL Server Agent uses this database to store job configurations and SQL job schedules along with SQL Alerts, and Operators. In addition, this database also stores all SQL job parameters along with each job’s execution history.  Finally, this database is also used to store database backup and maintenance plans as well as details pertaining to SQL Log shipping if it is being used. Distribution DatabaseThe Distribution database is only used during replication and stores meta data and history information pertaining to the act of replication data. Furthermore, when transactional replication is used this database also stores information regarding each transaction. It is important to note that replication is not turned on by default in MS SQL Server and that the distribution database is hidden from SSMS. Tempdb DatabaseThe Tempdb as the name implies is used to store temporary data and data objects. Examples of this include temp tables and temp store procedures. It is important to note that when using this database all data and data objects are cleared from this database when SQL Server restarts. This database is also used by SQL Server when it is performing some internal operations. Typically, SQL Server uses this database for the purpose of large sort and index operations. Finally, this database is used to store row versions if row versioning or snapsot isolation transactions are being used by SQL Server. Additionally, I would love to hear from others about their experiences using system databases, tables, and objects in a real world environments.

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  • git changing head not reflected on co-dev's branch

    - by stevekrzysiak
    Basically, we undid history. I know this is bad, and I am already committed to avoiding this at all costs in the future, but what is done is done. Anyway, I issued a git push origin <1_week_old_sha:master to undo some bad commits. I then deleted a buggered branch called release(which had also received some bad commits) from remote and then branched a new release off master. I pushed this to remote. So basically, remote master & release are clones and just how I want them. The issue is if I clone the repo anew(or work in my current repo) everything looks great....but when my co-devs delete their release branch and create a new one based off the new remote release I created, they still see all the old junk I tried to remove. I feel this has to do with some local .git files mistaking the new branch release for the old release. Any thoughts? Thanks.

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  • why is it a risk to clone a LUKS container?

    - by laramichaels
    I recently installed Ubuntu onto an encrypted partition using the LUKS+LVM combination that the 'alternate' installer offers. Now I want to create backups of my HD. From the LUKS FAQ: 6.15 Can I clone a LUKS container? You can, but it breaks security, because the cloned container has the same header and hence the same master key. You cannot change the master key on a LUKS container, even if you change the passphrase(s), the master key stays the same. That means whoever has access to one of the clones can decrypt them all, completely bypassing the passphrases. How can the existence of a perfect clone of my encrypted HD break security if it contains the exact same information as my live encrypted HD? In which sense does keeping updated clones of my LUKS-encrypted HD around "break security"?

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  • Django Redundancy

    - by Sunsu
    I've read many things about scaling Django and the new multiple-DB support makes it so much easier. However, I have not been able to find much information on good ways to create a fully redundant system (not just one that scales). I realize there are many things that go into this problem, but the real thing I'm having trouble solving well is Database redundancy. Is it possible to set up a "write slave" using django's new multiple-DB support? If I had IP failover support it seems like having a write slave would help solve the problem. Simple MySQL replication doesn't seem like it will work due to slave lag right? What's the typical method of creating a redundant database system? Any input or guidance you guys have would be greatly appreciated. I realize I could be asking the wrong questions!

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  • GitHub OS project how to have a good version and a work in progress version

    - by Para
    I have started my own OS application, I am hosting it on GitHub. My problem is that I push changes to the repository from more than one location so sometimes I want to work on it and sometimes I can't always finish something in time but I would still like to push it anyway so I can fetch it later from my other location. I'd like to be able to somehow have a stable version and have the master branch be a 'work in progress'. How do I do this? Is there some button I can push that will take the code from my master branch and make it into a zip file in my downloads tab and call it a version or should I do this by hand? Would it be better to have the master branch be nice and neat and have a separate branch to play with and then merge the two when the time is right? Would this not cause more problems in the merging phase?

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