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  • MySQL Unions/Subselects not utilizing keys from associated tables

    - by Brett
    I've noticed by doing EXPLAINs that when a MySQL union between two tables is used, mysql creates a temporary table, but the temp table does not use keys, so queries are slowed considerably. Here is an example: SELECT * FROM ( SELECT `part_number`, `part_manufacturer_clean`, `part_number_clean`, `part_heci`, `part_manufacturer`, `part_description` FROM `new_products` AS `a` UNION SELECT `part` as `part_number`, `manulower` as `part_manufacturer_clean`, `partdeluxe` as `part_number_clean`, `heci` as `part_heci`, `manu` as `part_manufacturer`, `description` as `part_description` FROM `warehouse` AS `b` ) AS `c` WHERE `part_manufacturer_clean` = 'adc' EXPLAIN yields this: id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY <derived2> ALL (NULL) (NULL) (NULL) (NULL) 17206 Using where 2 DERIVED a ALL (NULL) (NULL) (NULL) (NULL) 17743 3 UNION b ALL (NULL) (NULL) (NULL) (NULL) 5757 (NULL) UNION RESULT <union2,3> ALL (NULL) (NULL) (NULL) (NULL) (NULL) In this case, part_manufacturer_clean and manulower are keys in both tables. When I don't use the subselects and union, and just use one table, everything works fine. I'm not sure if the issue is with the union or with the subselects. Is there any way to union two tables and still use keys/indexes for performance?

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  • Windows Azure Platform for Enterprises

    Cloud computing has already proven worthy of attention from established enterprises and start-ups alike. Most businesses are looking at cloud computing with more than just idle curiosity. As of this writing, IT market research suggests that most enterprise IT managers have enough resources to adopt cloud computing in combination with on-premises IT capabilities.

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  • Windows Azure Platform for Enterprises

    Cloud computing has already proven worthy of attention from established enterprises and start-ups alike. Most businesses are looking at cloud computing with more than just idle curiosity. As of this writing, IT market research suggests that most enterprise IT managers have enough resources to adopt cloud computing in combination with on-premises IT capabilities.

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  • Microsoft Issues Security Guidelines for Windows Azure

    New software development lifecycle outlines how to address security threats in the cloud....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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  • Image mapping using lookup tables [on hold]

    - by jblasius
    I have an optimization problem. I'm using a look-up table to map a pixel in an image: for (uint32_t index = 0u; index < imgSize; index++) { img[ lt[ index ] ] = val; } Is there a faster way to do this, perhaps using a reinterpret_cast or something like that? I am accessing two different memory addresses, so what is the compiler doing? One solution is to do a set of reads to access adjacent memory addresses. struct mblock { uint32_t buf[10u]; }; mblock mb; for (uint32_t index = 0u; index < imgSize; index += 10u) { mb = *reinterpret_cast<mblock*>(lt + index)); for (uint8_t i = 0u; i < 10u; i ++) { mb.buf[i] += img; } for (uint8_t i = 0u; i < 10u; i ++) { *( mb.buf[i] ) = val; } } This speeds up the code because I'm separating the image access from the table look-up; the positions in the look-up table are adjacent. I still get the image access problem as it is accessing random address positions.

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  • Languages and tools that are "portable" (work well from a USB storage drive) [closed]

    - by CodexArcanum
    I'm a huge fan of running programs from my portable hard drive: it means I always have my favorite tools no matter what computer I'm on. Sadly, development tools seem to be hard to get portable at times. I recently realized that the "portable" version of MinGW I was using off my USB drive was actually interfering with a locally installed version of MinGW, so sometimes even the tools you think are portable, aren't. So what are the best portable development tools that you've used? What runs well on a portable media, leaves the host machine clean, and generally makes moving around easier for you?

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  • Reliable Storage Systems for SQL Server

    By validating the IO path before commissioning the production database system, and performing ongoing validation through page checksums and DBCC checks, you can hopefully avoid data corruption altogether, or at least nip it in the bud. If corruption occurs, then you have to take the right decisions fast to deal with it. Rod Colledge explains how a pessimistic mindset can be an advantage

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  • Classless tables possible with Datamapper?

    - by barerd
    I have an Item class with the following attributes: itemId,name,weight,volume,price,required_skills,required_items. Since the last two attributes are going to be multivalued, I removed them and create new schemes like: itemID,required_skill (itemID is foreign key, itemID and required_skill is primary key.) Now, I'm confused how to create/use this new table. Here are the options that came to my mind: 1) The relationship between Items and Required_skills is one-to-many, so I may create a RequiredSkill class, which belongs_to Item, which in turn has n RequiredSkills. Then I can do Item.get(1).requiredskills. This sounds most logical to me. 2) Since required_skills may well be thought of as constants (since they resemble rules), I may put them into a hash or gdbm database or another sql table and query from there, which I don't prefer. My question is: is there sth like a modelless table in datamapper, where datamapper is responsible from the creation and integrity of the table and allows me to query it in datamapper way, but does not require a class, like I may do it in sql?

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  • Multitasking or Tombstoning and Isolated Storage in Windows Phone 7

    Windows Phone 7 manages multiple active applications by implementing a stack. In a sense, this application stack extends the page stack within a single Silverlight program. You can think of the phone as an old-fashioned web browser with no tab feature and no Forward button. But it does have a Back button and it also has a Start button, which brings you to the Start screen and allows you to launch a new program.

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  • Cookie Settings Storage Method

    - by Paul
    I've got an web app that needs to store some non-sensitive preferences for the user. Right now I'm storing their language preference and what mode they want a window opened in by default in two cookies: "lang" can be "en" or "de" "mode" can be "design" or "view" I might add a few more in the future. I'm not sure how many, but probably never more than a dozen. Language is parsed on every request, whereas the mode cookie is only used occasionally. I saw a recommendation that made sense I shouldn't try to do what I was originally planning to do and strongly type a user settings class deserialized on each request because of the overhead involved. I see three options here and I'm not sure which is the best overall. Keep things as they are, add a new cookie for each new setting Combine the cookies into a single settings cookie and add future values to it Change the mode cookie to settings (leaving language alone), add new user settings values to the settings cookie All would work obviously. I'm leaning toward option three, but I'm not sure if there's a best practice for this?

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  • Use Thread-local Storage to Reduce Synchronization

    Synchronization is often an expensive operation that can limit the performance of a multithreaded program. Using thread-local data structures instead of data structures shared by the threads can reduce synchronization in certain cases, allowing a program to run faster.

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  • Windows Azure Active Directory: Should You Use It?

    Computerworld offers a full review of the developer preview version of WAAD. Jonathan Hassell, the review's author, effectively gave the service a grade of incomplete. While you can't expect something that's effectively a beta to include everything that will be in the final version, WAAD presented a number of annoying problems that definitely need fixing before it can attract a wide share of the market. First, you can't even try out the service unless you sign up for a trial of Office 365, Microsoft's cloud Office suite. The software giant does plan to let you bring up an instance of WAAD as...

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