How safe is the use of Application varaibles in ASP !!Urgent


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Thread: How safe is the use of Application varaibles in ASP !!Urgent

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  1. #1
    neeraj Guest

    How safe is the use of Application varaibles in ASP !!Urgent

    Hi All..

    I want some expert discussion on the usage of Application Variables in ASP.
    i m is using a big database on my web site. Actually in my site we are
    generating information 15-20 times in a day and uploading it to the net for
    the viewing.. Right now i have a option to use XML or Database to retrive
    this information for the view purposes.. But i m expecting a huge number of
    hits on my site and i m not sure can my server will be able to handle that
    much load of Components to parse data from XML or Database.. (XMLDOM,ADODB).
    I feel these components are very resource extecnsive applications. So i want
    to avoid the usage of any component to parse my data.
    After a lot of thought i came to the conclusion to use Application Varaibles
    of ASP to store data.. I feel this will be very fast and will use the server
    resources very optimisticly.
    Now my doubts are :
    1. Can i store huge amount of data in the Application Variables say 50 kb of
    data, if we store it in a XML format.
    2. is the Application varaibles are safe to store information .. i mean in
    anycase information should not be lost or manuplated accidently.
    3. What is the Server Resources utilization, in this architecture.
    4. At what extend i m right to think usage og Application varaibles in the
    place of Database or XML

    These are few things i have in my mind and i m sure u people can guide in a
    very proper way..

    Thanx a lot..
    Looking for a quick response...

    Neeraj Gargi
    Neeraj Gargi
    wow-india.com



  2. #2
    Sergey Guest

    Re: How safe is the use of Application varaibles in ASP !!Urgent

    1. I've never used Application obj to store that amound (50k) of data, but I
    would imagine it would be fine.
    2. As long as you don't store single threaded objects in there.
    Application obj is multithreaded so you can access variables at the
    concurrently, but when writing into variables makes sure you lock it. When
    locked Application obj blocks access to all variables.
    Application variables are kept around until you stop IIS.
    3. Don't know
    4. No matter what, in memory storage will be faster than DB or file system.
    With some more logic you can check time stamp and reload data after certain
    time.

    I've read an article somewhere (could've been MSDN Mag) that you can also
    store XML DOM in Application variable, use FreeThreadedDOMDocument instead
    of DOMDocument.

    Just my opinion,
    Sergey.

    "neeraj" <neeraj@wow-india.net> wrote in message
    news:3a6bce58@news.devx.com...
    > Hi All..
    >
    > I want some expert discussion on the usage of Application Variables in

    ASP.
    > i m is using a big database on my web site. Actually in my site we are
    > generating information 15-20 times in a day and uploading it to the net

    for
    > the viewing.. Right now i have a option to use XML or Database to retrive
    > this information for the view purposes.. But i m expecting a huge number

    of
    > hits on my site and i m not sure can my server will be able to handle that
    > much load of Components to parse data from XML or Database..

    (XMLDOM,ADODB).
    > I feel these components are very resource extecnsive applications. So i

    want
    > to avoid the usage of any component to parse my data.
    > After a lot of thought i came to the conclusion to use Application

    Varaibles
    > of ASP to store data.. I feel this will be very fast and will use the

    server
    > resources very optimisticly.
    > Now my doubts are :
    > 1. Can i store huge amount of data in the Application Variables say 50 kb

    of
    > data, if we store it in a XML format.
    > 2. is the Application varaibles are safe to store information .. i mean in
    > anycase information should not be lost or manuplated accidently.
    > 3. What is the Server Resources utilization, in this architecture.
    > 4. At what extend i m right to think usage og Application varaibles in the
    > place of Database or XML
    >
    > These are few things i have in my mind and i m sure u people can guide in

    a
    > very proper way..
    >
    > Thanx a lot..
    > Looking for a quick response...
    >
    > Neeraj Gargi
    > Neeraj Gargi
    > wow-india.com
    >
    >




  3. #3
    Russell Jones Guest

    Re: How safe is the use of Application varaibles in ASP !!Urgent

    Caching information in Application variables is both safe and scalable as
    long as you follow these rules:

    1. Use the Lock and Unlock methods whenever you change the information.
    2. Minimize changes, as the Lock method blocks all other threads from
    accessing Application variables until the unlock occurs.
    3. Don't store apartment-threaded objects in Application variables.
    Free-threaded objects are OK, but avoid storing objects at all unless the
    overhead of recreating the object from cached data is higher than the
    performance hit of storing the object.
    4. If you're going to use a variable multiple times on a page, you're
    generally better off copying the value to a local variable.
    5. If you store arrays, you must update the Application variable if the page
    changes an array value.

    Since you're only updating the information a few times a day, consider
    caching the pages as HTML files which you can then include in your HTML
    template. After all, there's no point in using server resources to reformat
    the same information as HTML repeatedly. Using this method, you could avoid
    the overhead from Application variables altogether. The logic is:
    1. Given the current request, including any URL or form values, does a
    cached HTML page exist?
    2. If so, is it out of date? If so, recreate the page and include it, if
    not, just include it.

    Russell Jones
    Sr. Web Development Editor
    DevX.com

    "neeraj" <neeraj@wow-india.net> wrote in message
    news:3a6bce58@news.devx.com...
    > Hi All..
    >
    > I want some expert discussion on the usage of Application Variables in

    ASP.
    > i m is using a big database on my web site. Actually in my site we are
    > generating information 15-20 times in a day and uploading it to the net

    for
    > the viewing.. Right now i have a option to use XML or Database to retrive
    > this information for the view purposes.. But i m expecting a huge number

    of
    > hits on my site and i m not sure can my server will be able to handle that
    > much load of Components to parse data from XML or Database..

    (XMLDOM,ADODB).
    > I feel these components are very resource extecnsive applications. So i

    want
    > to avoid the usage of any component to parse my data.
    > After a lot of thought i came to the conclusion to use Application

    Varaibles
    > of ASP to store data.. I feel this will be very fast and will use the

    server
    > resources very optimisticly.
    > Now my doubts are :
    > 1. Can i store huge amount of data in the Application Variables say 50 kb

    of
    > data, if we store it in a XML format.
    > 2. is the Application varaibles are safe to store information .. i mean in
    > anycase information should not be lost or manuplated accidently.
    > 3. What is the Server Resources utilization, in this architecture.
    > 4. At what extend i m right to think usage og Application varaibles in the
    > place of Database or XML
    >
    > These are few things i have in my mind and i m sure u people can guide in

    a
    > very proper way..
    >
    > Thanx a lot..
    > Looking for a quick response...
    >
    > Neeraj Gargi
    > Neeraj Gargi
    > wow-india.com
    >
    >




  4. #4
    John Crim Guest

    Re: How safe is the use of Application varaibles in ASP !!Urgent


    Use of Application variables is safe - as others mentioned, make sure you
    use "both" threaded COM objects (not apartment threaded ones), and watch
    out for locking issues when data is updated. What I mean by that is, if
    an ASP page checks a date and then runs some code and replaces an Application
    variable, if that ASP page is hit several times at essentially the same time,
    locking and update problems on the Application variable can result.

    WebGecko software (the company I work for) sells two products that may be
    useful to you, particularly since your site is high traffic and performance
    matters. The first is Active Page Generator (APGen) - this is probably the
    best choice for updating static, or partly static/partly dynamic pages multiple
    times a day. It can run ASP-like scripts from a scheduler, SQL triggers,
    ASP pages, etc. to update pages or page fragments when you want. It is easy
    to learn to use since you're an ASP developer.

    The second product is ASPCache - it is similar to the ASP Application object,
    but performs about 20x faster, can store a lot of data, and does item expiration
    for you. It also supports page fragment caching, which allows you to include
    static page fragments (typically generated by APGen) in dynamic pages. I
    suggest downloading the trial and testing its performance compared to your
    other options.

    Please email me if you'd like a trial version.

    Regards,
    John Crim
    WebGecko Software
    http://www.webgecko.com
    johnc@webgecko.com

    "neeraj" <neeraj@wow-india.net> wrote:
    >Hi All..
    >
    >I want some expert discussion on the usage of Application Variables in ASP.
    >i m is using a big database on my web site. Actually in my site we are
    >generating information 15-20 times in a day and uploading it to the net

    for
    >the viewing.. Right now i have a option to use XML or Database to retrive
    >this information for the view purposes.. But i m expecting a huge number

    of
    >hits on my site and i m not sure can my server will be able to handle that
    >much load of Components to parse data from XML or Database


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