very slow join on 2 indexed columns!

Hi all
I have 2 tables t1, t2
T1 have a foreign key to t2
When I join 2 tables and refrence t2 in the select select is very slow, if I joined them without refrecing select in select t2 is very quickly?

T1 have millions of lines, while t2 have 44 lines

the two join columns have clue about them, so why the join is very slow if I refrence in select t2! ?

Maurice Muller wrote:
Regarding is that I understand that all the filters have been put against the table t1. Because you have a FK activated between t1 and t2 Oracle will (probably) not to access the table t2 at all because it does not require simply all t2 data.

Maurice,

you're probably on the spot: the change described in the condition of 'register' above indicates that a 'join elimination"was conducted, I should read the post more carefully.

If anyone is interested in more information on this feature of 10.2 and later: http://optimizermagic.blogspot.com/2008/06/why-are-some-of-tables-in-my-query.html

Kind regards
Randolf

Oracle related blog stuff:
http://Oracle-Randolf.blogspot.com/

SQLTools ++ for Oracle (Open source Oracle GUI for Windows):
http://www.sqltools-plusplus.org:7676 /.
http://sourceforge.NET/projects/SQLT-pp/

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    Click Start - all programs - Accessories - run and type
     
    msconfig
    
     
    Then go to the Startup tab uncheck the things you don't need.
     
    Use the command line column to find info on the file, if it does not use display menu - Select the columnsdisplay. Use the name of the folder that contains the file and right click - Properties - Details tab to see what it is.
     

    Explorer

    Explorer (explorer.exe) is the program that is the start menu and taskbar, windows folder and the office (which is a folder window).

    The Explorer is built on addin programs called Extensions of Shell. The standard is provided by Microsoft, but programs add their own.

     
    • Download Autoruns http://technet.microsoft.com/en-us/sysinternals/bb963902.aspx
    • Close the windows explore
    • Start Autoruns by right-clicking and choose Run as administrator
    • Click on the Options menu - entries and Filter Options to hide Microsoft tick and clear to understand empty slots
    • Go to the explore tab and uncheck everything to the left.
    • Reset
     

    Difficulty of the Windows system to the performance issues on Windows computers slow Fixit

    Automatically troubleshoot and fix problems of Windows performance. Enhance, optimize and speed up Windows computers and make slow PC faster.
     

    http://support.Microsoft.com/mats/slow_windows_performance/en-us

    For the visit of the list the most comprehensive

    http://support.Microsoft.com/FixIt/en-us

    When you choose to download, choose the option to run on another computer. You can then save it to a folder on your hard drive. Open the folder, open the folder fix this laptop and run Run Fix It. It will contain all 27 FixIt.

    --

  • my computer runs very slow, what can I do?

    my computer runs very slow, what can I do?

    * original title - performance and security in Internet Explorer *.

    Hello

    Use the startup clean and other methods to try to determine the cause of and eliminate
    the questions.

    ---------------------------------------------------------------

    What antivirus/antispyware/security products do you have on the machine? Be one you have NEVER
    on this machine, including those you have uninstalled (they leave leftovers behind which can cause
    strange problems).

    ----------------------------------------------------

    Follow these steps:

    Start - type this in the search box-> find COMMAND at the top and RIGHT CLICK – RUN AS ADMIN

    Enter this at the command prompt - sfc/scannow

    How to analyze the log file entries that the Microsoft Windows Resource Checker (SFC.exe) program
    generates in Windows Vista cbs.log
    http://support.Microsoft.com/kb/928228

    Also run CheckDisk, so we cannot exclude as much as possible of the corruption.

    How to run the check disk at startup in Vista
    http://www.Vistax64.com/tutorials/67612-check-disk-Chkdsk.html

    ==========================================

    After the foregoing:

    How to troubleshoot a problem by performing a clean boot in Windows Vista
    http://support.Microsoft.com/kb/929135
    How to troubleshoot performance issues in Windows Vista
    http://support.Microsoft.com/kb/950685

    Optimize the performance of Microsoft Windows Vista
    http://support.Microsoft.com/kb/959062
    To see everything that is in charge of startup - wait a few minutes with nothing to do - then right-click
    Taskbar - the Task Manager process - take a look at stored by - Services - this is a quick way
    reference (if you have a small box at the bottom left - show for all users, then check that).

    How to check and change Vista startup programs
    http://www.Vistax64.com/tutorials/79612-startup-programs-enable-disable.html

    A quick check to see that load method 2 is - using MSCONFIG then put a list of
    those here.
    --------------------------------------------------------------------

    Tools that should help you:

    Process Explorer - free - find out which files, key of registry and other objects processes have opened.
    What DLLs they have loaded and more. This exceptionally effective utility will show you even who has
    each process.
    http://TechNet.Microsoft.com/en-us/Sysinternals/bb896653.aspx

    Autoruns - free - see what programs are configured to start automatically when you start your system
    and you log in. Autoruns also shows you the full list of registry and file locations where applications can
    Configure auto-start settings.
    http://TechNet.Microsoft.com/en-us/sysinternals/bb963902.aspx
    Process Monitor - Free - monitor the system files, registry, process, thread and DLL real-time activity.
    http://TechNet.Microsoft.com/en-us/Sysinternals/bb896645.aspx

    There are many excellent free tools from Sysinternals
    http://TechNet.Microsoft.com/en-us/Sysinternals/default.aspx

    -Free - WhatsInStartUP this utility displays the list of all applications that are loaded automatically
    When Windows starts. For each request, the following information is displayed: Type of startup (registry/Startup folder), Command - Line String, the product name, Version of the file, the name of the company;
    Location in the registry or the file system and more. It allows you to easily disable or remove unwanted
    a program that runs in your Windows startup.
    http://www.NirSoft.NET/utils/what_run_in_startup.html

    There are many excellent free tools to NirSoft
    http://www.NirSoft.NET/utils/index.html

    Window Watcher - free - do you know what is running on your computer? Maybe not. The window
    Watcher says it all, reporting of any window created by running programs, if the window
    is visible or not.
    http://www.KarenWare.com/PowerTools/ptwinwatch.asp

    Many excellent free tools and an excellent newsletter at Karenware
    http://www.KarenWare.com/

    ===========================================

    Vista and Windows 7 updated drivers love then here's how update the most important.

    This is my generic how updates of appropriate driver:

    This utility, it is easy see which versions are loaded:

    -Free - DriverView utility displays the list of all device drivers currently loaded on your system.
    For each driver in the list, additional useful information is displayed: load address of the driver,
    Description, version, product name, company that created the driver and more.
    http://www.NirSoft.NET/utils/DriverView.html

    For drivers, visit manufacturer of emergency system and of the manufacturer of the device that are the most common.
    Control Panel - device - Graphics Manager - note the brand and complete model
    your video card - double - tab of the driver - write version information. Now, click on update
    Driver (this can do nothing as MS is far behind the certification of drivers) - then right-click.
    Uninstall - REBOOT it will refresh the driver stack.

    Repeat this for network - card (NIC), Wifi network, sound, mouse, and keyboard if 3rd party
    with their own software and drivers and all other main drivers that you have.

    Now in the system manufacturer (Dell, HP, Toshiba as examples) site (in a restaurant), peripheral
    Site of the manufacturer (Realtek, Intel, Nvidia, ATI, for example) and get their latest versions. (Look for
    BIOS, Chipset and software updates on the site of the manufacturer of the system here.)

    Download - SAVE - go to where you put them - right click - RUN AD ADMIN - REBOOT after
    each installation.

    Always check in the Device Manager - drivers tab to be sure the version you actually install
    presents itself. This is because some restore drivers before the most recent is installed (sound card drivers
    in particular that) so to install a driver - reboot - check that it is installed and repeat as
    necessary.

    Repeat to the manufacturers - BTW in the DO NOT RUN THEIR SCANNER device - check
    manually by model.

    Look at the sites of the manufacturer for drivers - and the manufacturer of the device manually.
    http://pcsupport.about.com/od/driverssupport/HT/driverdlmfgr.htm

    How to install a device driver in Vista Device Manager
    http://www.Vistax64.com/tutorials/193584-Device-Manager-install-driver.html

    If you update the drivers manually, then it's a good idea to disable the facilities of driver under Windows
    Updates, that leaves about Windows updates but it will not install the drivers that will be generally
    older and cause problems. If updates offers a new driver and then HIDE it (right click on it), then
    get new manually if you wish.

    How to disable automatic driver Installation in Windows Vista - drivers
    http://www.AddictiveTips.com/Windows-Tips/how-to-disable-automatic-driver-installation-in-Windows-Vista/
    http://TechNet.Microsoft.com/en-us/library/cc730606 (WS.10) .aspx

    ===========================================

    Refer to these discussions because many more excellent advice however don't forget to check your antivirus
    programs, the main drivers and BIOS update and also solve the problems with the cleanboot method
    first.

    Problems with the overall speed of the system and performance
    http://support.Microsoft.com/GP/slow_windows_performance/en-us

    Performance and Maintenance Tips
    http://social.answers.Microsoft.com/forums/en-us/w7performance/thread/19e5d6c3-BF07-49ac-a2fa-6718c988f125

    Explorer Windows stopped working
    http://social.answers.Microsoft.com/forums/en-us/w7performance/thread/6ab02526-5071-4DCC-895F-d90202bad8b3

    I hope this helps and happy holidays!

    Rob Brown - Microsoft MVP<- profile="" -="" windows="" expert="" -="" consumer="" :="" bicycle="" -="" mark="" twain="" said="" it="">

  • Vuze download is very slow... He pointed out that I have a nat problem

    nat problem?

    Vuze download is very slow... He pointed out that I have a nat problem... Help please.?

    Hello

    ·        What browser do you use to access the internet?

    ·        What is the full error message that you receive?

    ·        Is it only when you download on Vuze?

    I suggest that temporarily disable you antivirus software and firewall installed on your computer and check to see if it helps:

    Disable the anti-virus software

    http://Windows.Microsoft.com/en-us/Windows-Vista/disable-antivirus-software

    Enable or disable Windows Firewall
     http://Windows.Microsoft.com/en-us/Windows-Vista/turn-Windows-Firewall-on-or-off

    Note: disabling anti-virus or Windows Firewall can make your computer (and your network, if you have one) more vulnerable to damage caused by worms or hackers.

    You can also post your query on Vuze forum to get help:

    http://Forum.Vuze.com/index.jspa

  • My computer is very slow. I used it for a year.

    original title: slow computer

    my computer is very slow and I have only had for a year I do not download anything that is mainly for testing or research, but I would like to catch up on shows I missed, but they take forever to watch because it's so slow, how can I solve this problem?

    Hello

    What antivirus/antispyware/security products do you have on the machine? Be one you have NEVER
    on this machine, including those you have uninstalled (they leave leftovers behind which can cause
    strange problems).

    ----------------------------------------------------

    Follow these steps:

    Start - type this in the search box-> find COMMAND at the top and RIGHT CLICK – RUN AS ADMIN

    Enter this at the command prompt - sfc/scannow

    How to analyze the log file entries that the Microsoft Windows Resource Checker (SFC.exe) program
    generates in Windows Vista cbs.log
    http://support.Microsoft.com/kb/928228

    Also run CheckDisk, so we cannot exclude as much as possible of the corruption.

    How to run the check disk at startup in Vista
    http://www.Vistax64.com/tutorials/67612-check-disk-Chkdsk.html

    ==========================================

    After the foregoing:

    How to troubleshoot a problem by performing a clean boot in Windows Vista
    http://support.Microsoft.com/kb/929135
    How to troubleshoot performance issues in Windows Vista
    http://support.Microsoft.com/kb/950685

    Optimize the performance of Microsoft Windows Vista
    http://support.Microsoft.com/kb/959062
    To see everything that is in charge of startup - wait a few minutes with nothing to do - then right-click
    Taskbar - the Task Manager process - take a look at stored by - Services - this is a quick way
    reference (if you have a small box at the bottom left - show for all users, then check that).

    How to check and change Vista startup programs
    http://www.Vistax64.com/tutorials/79612-startup-programs-enable-disable.html

    A quick check to see that load method 2 is - using MSCONFIG then put a list of
    those here.
    --------------------------------------------------------------------

    Tools that should help you:

    Process Explorer - free - find out which files, key of registry and other objects processes have opened.
    What DLLs they have loaded and more. This exceptionally effective utility will show you even who has
    each process.
    http://TechNet.Microsoft.com/en-us/Sysinternals/bb896653.aspx

    Autoruns - free - see what programs are configured to start automatically when you start your system
    and you log in. Autoruns also shows you the full list of registry and file locations where applications can
    Configure auto-start settings.
    http://TechNet.Microsoft.com/en-us/sysinternals/bb963902.aspx
    Process Monitor - Free - monitor the system files, registry, process, thread and DLL real-time activity.
    http://TechNet.Microsoft.com/en-us/Sysinternals/bb896645.aspx

    There are many excellent free tools from Sysinternals
    http://TechNet.Microsoft.com/en-us/Sysinternals/default.aspx

    -Free - WhatsInStartUP this utility displays the list of all applications that are loaded automatically
    When Windows starts. For each request, the following information is displayed: Type of startup (registry/Startup folder), Command - Line String, the product name, Version of the file, the name of the company;
    Location in the registry or the file system and more. It allows you to easily disable or remove unwanted
    a program that runs in your Windows startup.
    http://www.NirSoft.NET/utils/what_run_in_startup.html

    There are many excellent free tools to NirSoft
    http://www.NirSoft.NET/utils/index.html

    Window Watcher - free - do you know what is running on your computer? Maybe not. The window
    Watcher says it all, reporting of any window created by running programs, if the window
    is visible or not.
    http://www.KarenWare.com/PowerTools/ptwinwatch.asp

    Many excellent free tools and an excellent newsletter at Karenware
    http://www.KarenWare.com/

    ===========================================

    Vista and Windows 7 updated drivers love then here's how update the most important.

    This is my generic how updates of appropriate driver:

    This utility, it is easy see which versions are loaded:

    -Free - DriverView utility displays the list of all device drivers currently loaded on your system.
    For each driver in the list, additional useful information is displayed: load address of the driver,
    Description, version, product name, company that created the driver and more.
    http://www.NirSoft.NET/utils/DriverView.html

    For drivers, visit manufacturer of emergency system and of the manufacturer of the device that are the most common.
    Control Panel - device - Graphics Manager - note the brand and complete model
    your video card - double - tab of the driver - write version information. Now, click on update
    Driver (this can do nothing as MS is far behind the certification of drivers) - then right-click.
    Uninstall - REBOOT it will refresh the driver stack.

    Repeat this for network - card (NIC), Wifi network, sound, mouse, and keyboard if 3rd party
    with their own software and drivers and all other main drivers that you have.

    Now in the system manufacturer (Dell, HP, Toshiba as examples) site (in a restaurant), peripheral
    Site of the manufacturer (Realtek, Intel, Nvidia, ATI, for example) and get their latest versions. (Look for
    BIOS, Chipset and software updates on the site of the manufacturer of the system here.)

    Download - SAVE - go to where you put them - right click - RUN AD ADMIN - REBOOT after
    each installation.

    Always check in the Device Manager - drivers tab to be sure the version you actually install
    presents itself. This is because some restore drivers before the most recent is installed (sound card drivers
    in particular that) so to install a driver - reboot - check that it is installed and repeat as
    necessary.

    Repeat to the manufacturers - BTW in the DO NOT RUN THEIR SCANNER device - check
    manually by model.

    Look at the sites of the manufacturer for drivers - and the manufacturer of the device manually.
    http://pcsupport.about.com/od/driverssupport/HT/driverdlmfgr.htm

    How to install a device driver in Vista Device Manager
    http://www.Vistax64.com/tutorials/193584-Device-Manager-install-driver.html

    If you update the drivers manually, then it's a good idea to disable the facilities of driver under Windows
    Updates, that leaves about Windows updates but it will not install the drivers that will be generally
    older and cause problems. If updates offers a new driver and then HIDE it (right click on it), then
    get new manually if you wish.

    How to disable automatic driver Installation in Windows Vista - drivers
    http://www.AddictiveTips.com/Windows-Tips/how-to-disable-automatic-driver-installation-in-Windows-Vista/
    http://TechNet.Microsoft.com/en-us/library/cc730606 (WS.10) .aspx

    ===========================================

    Refer to these discussions because many more excellent advice however don't forget to check your antivirus
    programs, the main drivers and BIOS update and also solve the problems with the cleanboot method
    first.

    Problems with the overall speed of the system and performance
    http://support.Microsoft.com/GP/slow_windows_performance/en-us

    Performance and Maintenance Tips
    http://social.answers.Microsoft.com/forums/en-us/w7performance/thread/19e5d6c3-BF07-49ac-a2fa-6718c988f125

    Explorer Windows stopped working
    http://social.answers.Microsoft.com/forums/en-us/w7performance/thread/6ab02526-5071-4DCC-895F-d90202bad8b3

    Hope these helps.

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