very slow join on 2 indexed columns!
Hi allI 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/
Tags: Database
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Best regardsjjuanino wrote:
Well, the question is very simple: is it possible to get the first query to take the index and to avoid complete analysis? With no clues, of course.
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I have not tried with your data, but something like:select * from y where iduser in ( select /*+ precompute_subquery */ x.iduser from x where owner = 'APPQSYS' ) ; Regards Jonathan Lewis P.S. Found a reference note by Tanel Poder: http://blog.tanelpoder.com/2009/01/23/multipart-cursor-subexecution-and-precompute_subquery-hint/
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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.aspxAutoruns - 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.aspxThere 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.htmlThere are many excellent free tools to NirSoft
http://www.NirSoft.NET/utils/index.htmlWindow 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.aspMany 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.htmlFor 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.htmHow to install a device driver in Vista Device Manager
http://www.Vistax64.com/tutorials/193584-Device-Manager-install-driver.htmlIf 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-usPerformance and Maintenance Tips
http://social.answers.Microsoft.com/forums/en-us/w7performance/thread/19e5d6c3-BF07-49ac-a2fa-6718c988f125Explorer Windows stopped working
http://social.answers.Microsoft.com/forums/en-us/w7performance/thread/6ab02526-5071-4DCC-895F-d90202bad8b3I 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-offNote: 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:
-
My computer is very slow. I used it for a year.
original title: slow computermy 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/928228Also 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/950685Optimize 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.htmlA 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.aspxAutoruns - 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.aspxThere 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.htmlThere are many excellent free tools to NirSoft
http://www.NirSoft.NET/utils/index.htmlWindow 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.aspMany 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.htmlFor 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.htmHow to install a device driver in Vista Device Manager
http://www.Vistax64.com/tutorials/193584-Device-Manager-install-driver.htmlIf 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-usPerformance and Maintenance Tips
http://social.answers.Microsoft.com/forums/en-us/w7performance/thread/19e5d6c3-BF07-49ac-a2fa-6718c988f125Explorer Windows stopped working
http://social.answers.Microsoft.com/forums/en-us/w7performance/thread/6ab02526-5071-4DCC-895F-d90202bad8b3Hope these helps.
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