How is the -gm parameter effecting query runtime in detail?

During test I found out, that the parameter -gm seems to have some dramatic impact onto runtime of queries. In Detail I found a something like factor 0.5 to 0.6 inside my tests for a smaller system:
-iqtc 12000
-iqmc 12000
-iqlm 1000
-gm 100
-m
-iqrlvmem 6000
When setting -gm 1001, runtimes for a single query goes up from about 10 to about 40s.
So how is the -gm parameter effecting IQ in detail?

When IQ starts it allocates threads based on the -iqmt parameter.  If you don't set it, then it is computed as something like:
     -- 60 threads for each core up to 4
     -- 50 threads for each core after 4
     -- number of connections (-gm option)
     -- add 6 more just for good measure
Let's assume that your IQ instance has 16 cores and you have -gm set to 100 .  IQ would allocate 946 threads (60*4+50*12+100+6).  We have to add 1 more thread to this, too.  Before we can allocate threads, we have 1 thread that is running to start the server.
On my 16 core system, here are the threads allocated at startup for various values of -gm:
     -gn 10: 857 threads
     -gn 100: 947 threads (notice the +1 from the above algorithm?)
     -gn 1000: 1847 total threads
There are two major deductions from the thread total: IO threads and SA/user threads.
Of the threads, 40% are supposed to be held in reserve to handle IO tasks (sweeper and prefetch threads are set to 10% each and apply to main and temp cache) via the Prefetch_Threads_Percent and Sweeper_Threads_Percent options.  I am double checking this area just to make sure.  There was some work done on this in the v16 timeline.
For user threads, I don't see you having set -gn.  Assuming that -gn is not set, then IQ will reserve 5 + -gm threads (105).  Not a problem.  IQ will grab 5 more threads than are allocated via the above algorithm, but that's OK.
Things go a bit wrong on you when your -gn is set to the recommended value of 1.5 * -gm.  What happens is that we are computing the number of threads needed based on -gm (100 or 1000).  However, we are actually allocating threads based on -gm (105, 1005, 150, or 1500 depending on the default or best practices used).
Imagine that -gn is set to 1.5x -gm.  Of the 1847 threads allocated, 1500 are held in reserve for user connections.  Read that as threads for the catalog only.  There would be just 347 threads left over.  But don't forget the IO threads either.  Now all of a sudden there are no threads left for any work in IQ.  We are thread starved.  When IQ gets into a thread starvation mode, we have little or no threads left over to do work in IQ.  At that time, we use the one guaranteed thread that each user connection has to do all work.  This holds true for worker thread starvation as well as IO thread starvation.
One of two things is happening in your case.  You are either thread starved and forced to run everything single threaded or your system has so many threads that it must spend too much time maintaining threads that are not being used.
If you can run sp_iqsysmon in '-debug' mode you can look at the "Thread Manager" section to check out the thread usage and allocations.
Mark

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    However, i want to display only the users that a particular person accessing the page has the AUTH LEVEL to see. e.g. If the person accessing the page is an 'ApplicationAdministrator' then the page should display all users in the table, If its a 'DistributorAdministrator' then the page should display only users associated with that Distributor (i.e. assoc_dist_id = :p_Dist_id ) and If its an 'AgentAdministrator' , then the page should display only users associated with that Agent ( i.e. assoc_agent_id = :p_Agent_id).
    Currently my af:table component displays all the users in the table because the query for the view object is (select * from users) . However, i want to use the same viewobject and just set the where-clause at runtime with the appropriate parameter to restrict the dataset returned.
    Do anyone knows how to accomplish this ?

    David,
    See the custom method initializeDynamicVariableDefaults() in the SRViewObjectImpl.java class in the FrameworkExtentions project in the SRDemoSampleADFBC sample application. You can find out how to install the demo if you haven't already from the ADF Learning Center at:
    http://www.oracle.com/technology/products/adf/learnadf.html
    This class is a framework extension class for view objects that adds a neat, generic feature to be able to dynamic default the value of named bind variables. You can read more about what framework extension classes are and how to use them in Chapter 25, "Advanced Business Components Techniques" of the ADF Developer's Guide for Forms/4GL Developers, also available at the learning center above.
    It is an example of generic framework functionality that "kicks in" based on the presence of custom metadata properties on a named bind variable. See section 25.3.3 "Implementing Generic Functionality Driven by Custom Properties" in the dev guide for more details. Using this sample code, if you add a bind variable to a view object, and define a custom metadata property named "DynamicDefaultValue" on that bind variable, and set this custom metadata property to the value "CurrentUser", then that bind variable will have its value dynamically defaulted to the name of the authenticated user logged in. If instead you set this custom property to the value "UserRole", then the bind variable will be set to the comma-separated string containing the list of roles that the authenticated user is part of.
    Once you've created a framework extension class for view objects like this, you can have the view objects you create inherit this generic functionality.See section 25.1.4 "How to Base an ADF Component on a Framework Extension Class" in the dev guide for more info on this.
    By adapting a technique like this (or some idea similar that better suits your needs) you can have your view object query contain bind variables whose values automatically take on the defaults based on something in the user-session environment.

  • How tochange the description ofa field inthe parameter form query generator

    I have a parameter form which is fetching the details from the Location table.
    /* Select From [OLCT] T4 */
    Declare @ToLoc Varchar(300)
    /Where/
    Set @ToLoc = /* T4.Location*/ '[%4]'
    when i execute the parameter form Query selection criteria displayed is
    Name
    OLCT table the description of the field location is Name i want to change the description to location
    Please Help

    Thanks for the reply , It does not help.
    If meant the selection box when I run query to input values
    for example
    /* Select From [OINV] T1 */
    Declare @FromDate Datetime
    /Where/
    Set @FromDate = /* T1.DocDate*/ '[%1]'
    /* Select From [OINV] T2 */
    Declare @ToDate Datetime
    /Where/
    Set @ToDate = /* T2.DocDate*/ '[%2]'
    /* Select From [OLCT] T3 */
    Declare @FromLoc Varchar(300)
    /Where/
    Set @FromLoc = /* T3.Location*/ '[%3]'
    /* Select From [OLCT] T4 */
    Declare @ToLoc Varchar(300)
    /Where/
    Set @ToLoc = /* T4.Location*/ '[%4]'
    /* Select From [OLCT] T5 */
    Declare @Country Varchar(300)
    /Where/
    Set @Country = /* T5.Country*/ '[%5]'
    /* Select From [OLCT] T6 */
    Declare @State Varchar(300)
    /Where/
    Set @State = /* T6.state*/ '[%6]'
    Exec [SAP_SP_DB]..[NABC_TaxReport] 'SAP2007B','Inflow',@FromDate,@ToDate,@FromLoc,@ToLoc,@country,@state
    In the above query I have from and To Location which displays as Name in the selection box

  • How to set the table input in Query template?

    Hi all.
    I need to call a Bapi_objcl_change, with import parameter and a table as an input. I have done this, in BLS. I have set the table input in the
    form of xml. In BLS, I get the output(the value gets change in SAP R3, what i have given in BLS).  But if i set the same xml structure  in
    query template, I didn't get the output. Table input parameter does not take that xml source.  How to set the table input in Query template?
    can anyone help me?
    Regards,
    Hemalatha

    Hema,
    You probably need to XML encode the data so that it will pass properly and then xmldecode() it to set the BAPI input value.
    Sam

  • How to use the same column value in the casecadeing parameter in ssrs report?

    Hi frnz,
    I have a table site contains one filed SiteCode
    Now i have fields like below using the below quries 
    SThe above are the two results sets coming from the single table ,now i will use these two results /Query in my ssrs Casecade report
    1.First result set/Query will use for the first dataset and use these values in the paramet1 selection as PrimaryCodes
    2.Second result set/Query will use for the second Dataset and use these values in the parameter2 as SecondayCodes
    3.Using these two datsets and create a Casecadeing paramet in ssrs report.
    4.so using this information how can i create the Casecade report ,I have tried different ways but i didnt get the soluction
    I have done the follw but ididnt get the o/p.
    I have created two parameter and mapped to the results but while paramter selection i will able to see only the first paramet(PrimaryCodes) ,and i will not see the second paramter(SecondaryCodes) it could not show me the second paramter values in the drop
    down list.
    Note:Here i will use the Single Table to get the all the sitecodes 
    Can some one please help me out for this report.
    Thanks.

    Hi,
    Try below links for your reference:
    http://blogs.msdn.com/b/sqlforum/archive/2011/05/26/ssrs-cascading-parameter-with-optional-select-all-in-sql-reporting-services-report.aspx
    http://msdn.microsoft.com/en-us/library/dd255197.aspx
    http://blogs.msdn.com/b/psssql/archive/2010/01/29/how-to-have-a-select-all-multi-value-cascading-parameter.aspx
    sathya - www.allaboutmssql.com ** Mark as answered if my post solved your problem and Vote as helpful if my post was useful **.

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