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• Need to Determine the Engine Status?

  - by user702295

  If you need to establish the status of the engine, begin with this SQL: select status, engine, engine_version,fore_column_name from dm.forecast_history The status of an engine run is stored in the FORECAST_HISTORY table, in the “status” field.  We can also find in that table the FORE_COLUMN_NAME field. This field includes the name of the column in SALES_DATA in which the relevant forecast is stored. Here are the possible statuses: -1, -2 : The engine failed in the initialization phase.  Which means, before the engine manager created the engines.  0 : The engine stopped in the optimization phase.  Which means, after the engines were created.  1: The engine finished the run successfully.  2: Forecast was never calculated for the relevant column that is mentioned in FORE_COLUMN_NAME.  

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• Best Practices for serializing/persisting String Object Dictionary entities

  - by Mark Heath

  I'm noticing a trend towards using a dictionary of string to object (or sometimes string to string), instead of strongly typed objects. For example, the new Katana project makes heavy use of IDictionary<string,object>. This approach avoids the need to continually update your entity classes/DTOs and the database tables that persist them with new properties. It also avoids the need to create new derived entity types to support new types of entity, since the Dictionary is flexible enough to store any arbitrary properties. Here's a contrived example: class StorageDevice { public int Id { get; set; } public string Name { get; set; } } class NetworkShare : StorageDevice { public string Path { get; set; } public string LoginName { get; set; } public string Password { get; set; } } class CloudStorage : StorageDevice { public string ServerUri { get; set } public string ContainerName { get; set; } public int PortNumber { get; set; } public Guid ApiKey { get; set; } } versus: class StorageDevice { public IDictionary<string, object> Properties { get; set; } } Basically I'm on the lookout for any talks, books or articles on this approach, so I can pick up on any best practices / difficulties to avoid. Here's my main questions: Does this approach have a name? (only thing I've heard used so far is "self-describing objects") What are the best practices for persisting these dictionaries into a relational database? Especially the challenges of deserializing them successfully with strongly typed languages like C#. Does it change anything if some of the objects in the dictionary are themselves lists of strongly typed entities? Should a second dictionary be used if you want to temporarily store objects that are not to be persisted/serialized across a network, or should you use some kind of namespacing on the keys to indicate this?

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• iptables allow dyndns domain name and auto update rules

  - by user3215

  I have registered with dyndns domain for my dynamically changing public ip address to use with iptable rules. On a server I've allowed some ports for this domain in the iptables configuration like the below entries: -A INPUT -s mycompany.dyndns.com -p tcp -m tcp --dport 22 -j ACCEPT -A INPUT -s mycompany.dyndns.com -p tcp -m tcp --dport 3306 -j ACCEPT -A INPUT -s mycompany.dyndns.com -p tcp -m tcp --dport 21 -j ACCEPT But when ever my modem restarts, I couldn't connect to these allowed ports as public ip changes with modem restart and are not updated in the iptables on the server. Is there any option to automatically update iptable rules on server.

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• Collision in PyGame for spinning rectangular object.touching circles

  - by OverAchiever

  I'm creating a variation of Pong. One of the differences is that I use a rectangular structure as the object which is being bounced around, and I use circles as paddles. So far, all the collision handling I've worked with was using simple math (I wasn't using the collision "feature" in PyGame). The game is contained within a 2-dimensional continuous space. The idea is that the rectangular structure will spin at different speed depending on how far from the center you touch it with the circle. Also, any extremity of the rectangular structure should be able to touch any extremity of the circle. So I need to keep track of where it has been touched on both the circle and the rectangle to figure out the direction it will be bounced to. I intend to have basically 8 possible directions (Up, down, left, right and the half points between each one of those). I can work out the calculation of how the objected will be dislocated once I get the direction it will be dislocated to based on where it has been touch. I also need to keep track of where it has been touched to decide if the rectangular structure will spin clockwise or counter-clockwise after it collided. Before I started coding, I read the resources available at the PyGame website on the collision class they have (And its respective functions). I tried to work out the logic of what I was trying to achieve based on those resources and how the game will function. The only thing I could figure out that I could do was to make each one of these objects as a group of rectangular objects, and depending on which rectangle was touched the other would behave accordingly and give the illusion it is a single object. However, not only I don't know if this will work, but I also don't know if it is gonna look convincing based on how PyGame redraws the objects. Is there a way I can use PyGame to handle these collision detections by still having a single object? Can I figure out the point of collision on both objects using functions within PyGame precisely enough to achieve what I'm looking for? P.s: I hope the question was specific and clear enough. I apologize if there were any grammar mistakes, English is not my native language.

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• Granularity and Parallel Performance

  Determining the right granularity for parallel tasks Granularity - Parallel computing - Programming - Vendors - Projects

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• Unable to connect via NetBIOS Name

  - by grom

  I can't connect to machines/shares by NetBIOS names. Below is console output showing the problem. C:\>nbtstat -n Local Area Connection: Node IpAddress: [192.168.1.100] Scope Id: [] NetBIOS Local Name Table Name Type Status --------------------------------------------- BEAST <00> UNIQUE Registered WORKGROUP <00> GROUP Registered BEAST <20> UNIQUE Registered WORKGROUP <1E> GROUP Registered WORKGROUP <1D> UNIQUE Registered ..__MSBROWSE__.<01> GROUP Registered C:\>nbtstat -A 192.168.1.3 Local Area Connection: Node IpAddress: [192.168.1.100] Scope Id: [] NetBIOS Remote Machine Name Table Name Type Status --------------------------------------------- BRCLAPTOP <00> UNIQUE Registered WORKGROUP <00> GROUP Registered BRCLAPTOP <20> UNIQUE Registered WORKGROUP <1E> GROUP Registered MAC Address = 00-1C-BF-14-B8-6E C:\>ping beast Pinging beast [fe80::59b8:179f:b90b:a63f%11] with 32 bytes of data: Reply from fe80::59b8:179f:b90b:a63f%11: time<1ms Reply from fe80::59b8:179f:b90b:a63f%11: time<1ms Reply from fe80::59b8:179f:b90b:a63f%11: time<1ms Reply from fe80::59b8:179f:b90b:a63f%11: time<1ms Ping statistics for fe80::59b8:179f:b90b:a63f%11: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 0ms, Maximum = 0ms, Average = 0ms C:\>ping brclaptop Ping request could not find host brclaptop. Please check the name and try again. C:\>nbtstat -a brclaptop Local Area Connection: Node IpAddress: [192.168.1.100] Scope Id: [] Host not found.

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• Whats a good structure to save and retrieve locations of images?

  - by Goot

  I got a java-ee application, where I collect informations about movies. Im my backend I provide data like the name, description, genre and a random uuid. I also got lots of related files, which are stored on a file server. Including some screenshots, the dvd or bluRay cover and video trailers. My current approach is: When saving the files to the fileserver, I retrieve the movies random uuid (which is the primary key btw.). I then rename the files screenshot_[UUID]_1, screenshot_[UUID]_2 ... etc. Now, there are lots of other ways to handle this, like saving all filenames in a database or creating a dir structure on the fileserver for every uuid and, e.g., return all images in the "[uuid]/screenshots" folder via REST. I expect about 30k requests a day, so the service has to be pretty performant. Whats the best way to solve this?

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• Optimizing hierarchical transform

  - by Geotarget

  I'm transforming objects in 3D space by transforming each vector with the object's 4x4 transform matrix. In order to achieve hierarchical transform, I transform the child by its own matrix, and then the child by the parent matrix. This becomes costly because objects deeper in the display tree have to be transformed by all the parent objects. This is what's happening, in summary: Root -- transform its verts by Root matrix Parent -- transform its verts by Parent, Root matrix Child -- transform its verts by Child, Parent, Root matrix Is there a faster way to transform vertices to achieve hierarchical transform? What If I first concatenated each transform matrix with the parent matrices, and then transform verts by that final resulting matrix, would that work and wouldn't that be faster? Root -- transform its verts by Root matrix Parent -- concat Parent, Root matrices, transform its verts by Concated matrix Child -- concat Child, Parent, Root matrices, transform its verts by Concated matrix

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• Name of my sql server instance from outside the network

  - by Michel

  Hi, normally i connect to my sql server instance from my local computer, and then the server name to connect to is the name of my laptop. So i can connect to server instance 'MichelLaptop' But now i'm trying to connect to my server from outside my network, and the first thing i wonder is: what is the name of the instance? i've made a redirect to my local machine in the DNS of my domain, so i said (this is not the real data) testsql.mydomain.com goes to 190.191.192.193 and when i ping testsql.mydomain.com, i get a response from 190.191.192.193 But what then is the server name?

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• Oracle Database I/O Performance Tuning Using Benchmark Factory

  The real test of how heavily an Oracle database will tax its underlying I/O subsystem and related infrastructure is to actually tax that infrastructure using representative database application workloads. Jim Czuprynski tells you how to choose appropriate database schema(s) for realistic testing, how to create example TPC-E and TPC-H database schemas and how to perform initial loading of these schemas using Quest Benchmark Factory.

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• Evaluating an Object's PropertyPath

  This workaround provides a way to evaluate the PropertyPath value of an object, even if it's not bound to a data consumer.

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• Godaddy : linking domain name to IP address

  - by Lokpere

  I just bought a domain name for my web site from GoDaddy. the content of the site is available at a public IP address. how do I link my domain name to the IP address ? how do I make it so that when someone types in my domain name, the content of the web server is displayed ? thanks.

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• How get and set accessors work

  - by Chris Halcrow

  The standard method of implementing get and set accessors in C# and VB.NET is to use a public property to set and retrieve the value of a corresponding private variable. Am I right in saying that this has no effect of different instances of a variable? By this I mean, if there are different instantiations of an object, then those instances and their properties are completely independent right? So I think my understanding is correct that setting a private variable is just a construct to be able to implement the get and set pattern? Never been 100% sure about this.

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• Coherence Query Performance in Large Clusters

  - by jpurdy

  Large clusters (measured in terms of the number of storage-enabled members participating in the largest cache services) may introduce challenges when issuing queries. There is no particular cluster size threshold for this, rather a gradually increasing tendency for issues to arise. The most obvious challenges are that a client's perceived query latency will be determined by the slowest responder (more likely to be a factor in larger clusters) as well as the fact that adding additional cache servers will not increase query throughput if the query processing is not compute-bound (which would generally be the case for most indexed queries). If the data set can take advantage of the partition affinity features of Coherence, then the application can use a PartitionedFilter to target a query to a single server (using partition affinity to ensure that all data is in a single partition). If this can not be done, then avoiding an excessive number of cache server JVMs will help, as will ensuring that each cache server has sufficient CPU resources available and is also properly configured to minimize GC pauses (the most common cause of a slow-responding cache server).

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• SQL Monitor Performance Metric: Buffer Cache Used Per Database in MB

  Data pages read from disk are placed in the buffer pool with the intention that they will be reused, and accessing them from RAM is faster than from disk. Knowing how much of your RAM is committed to each database can help you provision the right amount of RAM to SQL Server, and also to identify rogue queries that draw too much data into RAM and force data from other databases out of the cache. Deployment Manager 2 is now free!The new version includes tons of new features and we've launched a completely free Starter Edition! Get Deployment Manager here

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• Rotation, further I go from 0:0, the further the object positions around the origin while rotating

  - by Serguei Fedorov

  For some reason I am having the issue where the following code: global.spriteBatch.Draw(obj.sprite, obj.getPosition(), null, Color.White, obj.rotation, obj.center, 2f, SpriteEffects.None, 1); causes the object to rotate around the origin in such a way, as though there is an offset to the position relative to its location. The calculation for the center it correct and this happens even if I set the pivot to be the location of the object. The further I get from 0:0 the larger the radius or rotation. I am not sure what is going on here because given the following tutorial http://www.riemers.net/eng/Tutorials/XNA/Csharp/Series2D/Rotation.php I have done the code setup correctly. Any ideas? Any help is greatly appreciated!!!

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• Trick Ubuntu into resolving a domain name locally

  - by Matthew Brown

  I have an Ubuntu box that I use for all sorts of things. One thing I really want to do is redirect a sub domain to a local script. For example thisbit.example.com should actually show the content from localhost/~USER/FAKE.thisbit.example.com/ which is a folder that Apache is running for me which contains a very simple PHP script which implements an offline version of a server script that I am testing against. But example.com should continue to behave normally as should notthisbit.example.com etc. Ideally I need to be able to switch from testing to live with minimal fuss when the time comes.

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• Visual studio fast performance with splash disable

  - by anirudha

  Visual studio perform faster whenever you run them in without splash. for running them without splash you need to change some setting for that. go to shortcut icon of visual studio open the properties and see the target executable the executable location something like "C:\Program Files (x86)\Microsoft Visual Studio 10.0\Common7\IDE\devenv.exe" for x64based computer now you need to add their “ /nosplash” the exe location now goes "C:\Program Files (x86)\Microsoft Visual Studio 10.0\Common7\IDE\devenv.exe" /nosplash

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• Minecraft: Slow performance OUT of the game

  - by blackn1ght

  I downloaded Minecraft yesterday to see what the fuss is about, brilliant game! When playing in Windowed mode, if I try and do anything else, i.e. use the computer, when the game is paused, the computer is incredibly slow, it takes a minute just to type a short message into empathy. Also, once I quit the game, the computer remains slow for about 5 minutes, until it magically frees up and becomes fast again. Could this be related to the 512mb RAM limitation of Java, and the machine is swapping? Even trying to submit this post is incredibly slow and frustrating, it's taking me a minute just to click in the 'Tag's box. Any ideas? Ubuntu 10.10 x64 Intel Q9550 4GB RAM nVidia 8800GTS 320mb (w/prop drivers installed)

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• How best to merge/sort/page through tons of JSON arrays?

  - by Joshiatto

  Here's the scenario: Say you have millions of JSON documents stored as text files. Each JSON document is an array of "activity" objects, each of which contain a "created_datetime" attribute. What is the best way to merge/sort/filter/page through these activities via a web UI? For example, say we want to take a few thousand of the documents, merge them into a gigantic array, sort the array by the "created_datetime" attribute descending and then page through it 10 activities at a time. Also keep in mind that roughly 25% of these JSON documents are updated every day, and updates have to make it into the view within 5 minutes. My first thought is to parse all of the documents into an RDBMS table and then it would just be a simple query such as "select top 10 name, created_datetime from Activity where user_id=12345 order by created_datetime desc". Some have suggested I use NoSQL techniques such as hadoop or map/reduce instead. How exactly would this work? For more background, see: Why is NoSQL better for this scenario?

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• Dos more RAM on Mac really improve performance?

  - by Moshe

  I'm coming from a PC, loaded with a Core 2 Quad CPU and 8GB of DDR2 RAM. I was running Premiere CS3. I'm new to Mac so I'm not sure if this will help performance: Will increasing my 21.5" Core 2 Duo iMac's memory from 4GB (DDR3) to 8GB improve performance of Premiere CS4 significantly? I am not impressed with Premiere as it is now. The iMac is the newest one as of this post.

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• Trending Buffer Pool Performance Using DMV sys.dm_os_performance_counters

  I'd seen you posted a tip on capturing SQL based PerfMon counters using sys.dm_os_performance_counters. What queries can I run against those stored results that would allow me to examine memory usage on my SQL instance? Join SQL Backup’s 35,000+ customers to compress and strengthen your backups "SQL Backup will be a REAL boost to any DBA lucky enough to use it." Jonathan Allen. Download a free trial now.

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• ClearTrace Performance on 170GB of Trace Files

  - by Bill Graziano

  I’ve always worked to make ClearTrace perform well.  That’s probably because I spend so much time watching it work.  I’m often going through two or three gigabytes of trace files but I rarely get the chance to run it on a really large set of files. One of my clients wanted to run a full trace for a week and then analyze the results.  At the end of that week we had 847 200MB trace files for a total of nearly 170GB. I regularly use 200MB trace files when I monitor production systems.  I usually get around 300,000 statements in a file that size if it’s mostly stored procedures.  So those 847 trace files contained roughly 250 million statements.  (That’s 730 bytes per statement if you’re keeping track.  Newer trace files have some compression in them but I’m not exactly sure what they’re doing.)  On a system running 1,000 statements per second I get a new file every five minutes or so. It took 27 hours to process these files on an older development box.  That works out to 1.77MB/second.  That means ClearTrace processed about 2,654 statements per second. You can query the data while you’re loading it but I’ve found it works better to use a second instance of ClearTrace to do this.  I’m not sure why yet but I think there’s still some dependency between the two processes. ClearTrace is almost always CPU bound.  It’s really just a huge, ugly collection of regular expressions.  It only writes a summary to its database at the end of each trace file so that usually isn’t a bottleneck.  At the end of this process, the executable was using roughly 435MB of RAM.  Certainly more than when it started but I think that’s acceptable. The database where all this is stored started out at 100MB.  After processing 170GB of trace files the database had grown to 203MB.  The space savings are due to the “datawarehouse-ish” design and only storing a summary of each trace file. You can download ClearTrace for SQL Server 2008 or test out the beta version for SQL Server 2012.  Happy Tuning!

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• Cocos2d Box2d contact listener call different method in collided object

  - by roma86

  I have the building object, wen it hit with other, i want to call some method inside it. Building.mm -(void)printTest { NSLog(@"printTest method work correctly"); } in my ContactListener i trying to call it so: ContactListener.mm #import "ContactListener.h" #import "Building.h" void ContactListener::BeginContact(b2Contact* contact) { b2Body* bodyA = contact->GetFixtureA()->GetBody(); b2Body* bodyB = contact->GetFixtureB()->GetBody(); Building *buildA = (Building *)bodyA->GetUserData(); Building *buildB = (Building *)bodyB->GetUserData(); if (buildB.tag == 1) { NSLog(@"tag == 1"); } if (buildA.tag == 2) { NSLog(@"tag == 2"); [buildA printTest]; } } NSLog(@"tag == 2"); work correctly, but [buildA printTest]; get error Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[CCSprite printTest]: unrecognized selector sent to instance 0x18595f0' Obviously I'm referring to the wrong object. How i can get different method and property in contacted objects from contactlistener class? Thanks.

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• The ETL from Hell - Diagnosing Batch System Performance Issues

  Too often, the batch systems that underlie a lot of database processing just grow without conscious design. When runs start to extend beyond their allotted time, and tuning no longer solves the problem, it is often discovered that batches are run in series, with draconian error handling. It is time to impose some rational design, and Nigel is a seasoned healer of batch processes. The seven tools in the SQL DBA Bundle support your core SQL Server database administration tasks.Make backups a breeze! Enjoy trouble-free troubleshooting! Make the most of monitoring! Download a free trial now.

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