Performance with using dbms_lock.sleep

Hi,
does anybody knows wether the performance of my database will going down if i use a dbms_lock.sleep(900) in one of my sessions.
Regards, Kay

We use dbms_lock.sleep all the time without any problems. Although, I have never used a 900 second value. Maybe you should look into using dbms_job.

Similar Messages

Extremely slow performance with Radeon HD 7870

Hi,
I am using a number of Adobe programs on my new Windows 8 64 bit system, with 16 gigs of ram, an Intel Core i5 2.67ghz, and AMD Radeon HD 7870 2 gig. All the programs (including After Effects and Illustrator) work very well with the exception of Photoshop CS6 64 bit, which has extremely slow performance with Use Graphics Processor enabled in my preferences (which Photoshop selects by default). If I turn off Use Graphics Processor, the slow performance vanishes. If I change Drawing Mode to Basic, there might be a slightly detectable improvement over Normal and Advanced, but it's still horribly slow. The refresh rate seems to be just a few frames per second. Everything is slow: brushes, zooming, panning, everything.
I've tried changing the settings I've seen suggested elsewhere: I switched Cache levels to 2, history states to 10, and tile size to 128k. No effect. Photoshop is currently at the default of using 60% of available ram. Efficiency has remained at 100% throughout all my tests. Also, this slow performance has affected me from the moment I installed Photoshop; it didn't crop up after previous good performance. The problem exists regardless of the size or number of documents I have open. Performance is still terrible even when I create a 500 x 500 pixel blank new canvas and try a simple task like drawing with the brush.
Photoshop is fully up to date, and so are my graphics drivers (Catalyst version 13.1). Any help would be greatly appreciated; at the moment performance is so bad in Photoshop that it's unusable with graphics acceleration enabled. Thanks in advance for replying.
Photoshop System Info:
Adobe Photoshop Version: 13.1.2 (13.1.2 20130105.r.224 2013/01/05:23:00:00) x64
Operating System: Windows 8 64-bit
Version: 6.2
System architecture: Intel CPU Family:6, Model:14, Stepping:5 with MMX, SSE Integer, SSE FP, SSE2, SSE3, SSE4.1, SSE4.2
Physical processor count: 4
Processor speed: 2665 MHz
Built-in memory: 16379 MB
Free memory: 13443 MB
Memory available to Photoshop: 14697 MB
Memory used by Photoshop: 60 %
Image tile size: 128K
Image cache levels: 2
OpenGL Drawing: Enabled.
OpenGL Drawing Mode: Advanced
OpenGL Allow Normal Mode: True.
OpenGL Allow Advanced Mode: True.
OpenGL Allow Old GPUs: Not Detected.
OpenCL Version: 1.2 AMD-APP (1084.4)
OpenGL Version: 3.0
Video Rect Texture Size: 16384
OpenGL Memory: 2048 MB
Video Card Vendor: ATI Technologies Inc.
Video Card Renderer: AMD Radeon HD 7800 Series
Display: 1
Display Bounds: top=0, left=0, bottom=1080, right=1920
Video Card Number: 2
Video Card: AMD Radeon HD 7800 Series
Driver Version:
Driver Date:
Video Card Driver: aticfx64.dll,aticfx64.dll,aticfx64.dll,aticfx32,aticfx32,aticfx32,atiumd64.dll,atidxx64.d ll,atidxx64.dll,atiumdag,atidxx32,atidxx32,atiumdva,atiumd6a.cap,atitmm64.dll
Video Mode: 1920 x 1080 x 4294967296 colors
Video Card Caption: AMD Radeon HD 7800 Series
Video Card Memory: 2048 MB
Video Card Number: 1
Video Card: Microsoft Basic Render Driver
Driver Version: 9.12.0.0
Driver Date: 20121219000000.000000-000
Video Card Driver:
Video Mode:
Video Card Caption: Microsoft Basic Render Driver
Video Card Memory: 0 MB
Serial number: 90970078453021833509
Application folder: C:\Program Files\Adobe\Adobe Photoshop CS6 (64 Bit)\
Temporary file path: C:\Users\RAFFAE~1\AppData\Local\Temp\
Photoshop scratch has async I/O enabled
Scratch volume(s):
C:\, 931.5G, 534.8G free
Required Plug-ins folder: C:\Program Files\Adobe\Adobe Photoshop CS6 (64 Bit)\Required\
Primary Plug-ins folder: C:\Program Files\Adobe\Adobe Photoshop CS6 (64 Bit)\Plug-ins\
Additional Plug-ins folder: not set
Installed components:
   ACE.dll   ACE 2012/06/05-15:16:32   66.507768   66.507768
   adbeape.dll   Adobe APE 2012/01/25-10:04:55   66.1025012   66.1025012
   AdobeLinguistic.dll   Adobe Linguisitc Library   6.0.0
   AdobeOwl.dll   Adobe Owl 2012/09/10-12:31:21   5.0.4   79.517869
   AdobePDFL.dll   PDFL 2011/12/12-16:12:37   66.419471   66.419471
   AdobePIP.dll   Adobe Product Improvement Program   7.0.0.1686
   AdobeXMP.dll   Adobe XMP Core 2012/02/06-14:56:27   66.145661   66.145661
   AdobeXMPFiles.dll   Adobe XMP Files 2012/02/06-14:56:27   66.145661   66.145661
   AdobeXMPScript.dll   Adobe XMP Script 2012/02/06-14:56:27   66.145661   66.145661
   adobe_caps.dll   Adobe CAPS   6,0,29,0
   AGM.dll   AGM 2012/06/05-15:16:32   66.507768   66.507768
   ahclient.dll    AdobeHelp Dynamic Link Library   1,7,0,56
   aif_core.dll   AIF   3.0   62.490293
   aif_ocl.dll   AIF   3.0   62.490293
   aif_ogl.dll   AIF   3.0   62.490293
   amtlib.dll   AMTLib (64 Bit)   6.0.0.75 (BuildVersion: 6.0; BuildDate: Mon Jan 16 2012 18:00:00)   1.000000
   ARE.dll   ARE 2012/06/05-15:16:32   66.507768   66.507768
   AXE8SharedExpat.dll   AXE8SharedExpat 2011/12/16-15:10:49   66.26830   66.26830
   AXEDOMCore.dll   AXEDOMCore 2011/12/16-15:10:49   66.26830   66.26830
   Bib.dll   BIB 2012/06/05-15:16:32   66.507768   66.507768
   BIBUtils.dll   BIBUtils 2012/06/05-15:16:32   66.507768   66.507768
   boost_date_time.dll   DVA Product   6.0.0
   boost_signals.dll   DVA Product   6.0.0
   boost_system.dll   DVA Product   6.0.0
   boost_threads.dll   DVA Product   6.0.0
   cg.dll   NVIDIA Cg Runtime   3.0.00007
   cgGL.dll   NVIDIA Cg Runtime   3.0.00007
   CIT.dll   Adobe CIT   2.1.0.20577   2.1.0.20577
   CoolType.dll   CoolType 2012/06/05-15:16:32   66.507768   66.507768
   data_flow.dll   AIF   3.0   62.490293
   dvaaudiodevice.dll   DVA Product   6.0.0
   dvacore.dll   DVA Product   6.0.0
   dvamarshal.dll   DVA Product   6.0.0
   dvamediatypes.dll   DVA Product   6.0.0
   dvaplayer.dll   DVA Product   6.0.0
   dvatransport.dll   DVA Product   6.0.0
   dvaunittesting.dll   DVA Product   6.0.0
   dynamiclink.dll   DVA Product   6.0.0
   ExtendScript.dll   ExtendScript 2011/12/14-15:08:46   66.490082   66.490082
   FileInfo.dll   Adobe XMP FileInfo 2012/01/17-15:11:19   66.145433   66.145433
   filter_graph.dll   AIF   3.0   62.490293
   hydra_filters.dll   AIF   3.0   62.490293
   icucnv40.dll   International Components for Unicode 2011/11/15-16:30:22    Build gtlib_3.0.16615
   icudt40.dll   International Components for Unicode 2011/11/15-16:30:22    Build gtlib_3.0.16615
   image_compiler.dll   AIF   3.0   62.490293
   image_flow.dll   AIF   3.0   62.490293
   image_runtime.dll   AIF   3.0   62.490293
   JP2KLib.dll   JP2KLib 2011/12/12-16:12:37   66.236923   66.236923
   libifcoremd.dll   Intel(r) Visual Fortran Compiler   10.0 (Update A)
   libmmd.dll   Intel(r) C Compiler, Intel(r) C++ Compiler, Intel(r) Fortran Compiler   12.0
   LogSession.dll   LogSession   2.1.2.1681
   mediacoreif.dll   DVA Product   6.0.0
   MPS.dll   MPS 2012/02/03-10:33:13   66.495174   66.495174
   msvcm80.dll   Microsoft® Visual Studio® 2005   8.00.50727.6910
   msvcm90.dll   Microsoft® Visual Studio® 2008   9.00.30729.1
   msvcp100.dll   Microsoft® Visual Studio® 2010   10.00.40219.1
   msvcp80.dll   Microsoft® Visual Studio® 2005   8.00.50727.6910
   msvcp90.dll   Microsoft® Visual Studio® 2008   9.00.30729.1
   msvcr100.dll   Microsoft® Visual Studio® 2010   10.00.40219.1
   msvcr80.dll   Microsoft® Visual Studio® 2005   8.00.50727.6910
   msvcr90.dll   Microsoft® Visual Studio® 2008   9.00.30729.1
   pdfsettings.dll   Adobe PDFSettings   1.04
   Photoshop.dll   Adobe Photoshop CS6   CS6
   Plugin.dll   Adobe Photoshop CS6   CS6
   PlugPlug.dll   Adobe(R) CSXS PlugPlug Standard Dll (64 bit)   3.0.0.383
   PSArt.dll   Adobe Photoshop CS6   CS6
   PSViews.dll   Adobe Photoshop CS6   CS6
   SCCore.dll   ScCore 2011/12/14-15:08:46   66.490082   66.490082
   ScriptUIFlex.dll   ScriptUIFlex 2011/12/14-15:08:46   66.490082   66.490082
   svml_dispmd.dll   Intel(r) C Compiler, Intel(r) C++ Compiler, Intel(r) Fortran Compiler   12.0
   tbb.dll   Intel(R) Threading Building Blocks for Windows   3, 0, 2010, 0406
   tbbmalloc.dll   Intel(R) Threading Building Blocks for Windows   3, 0, 2010, 0406
   updaternotifications.dll   Adobe Updater Notifications Library   6.0.0.24 (BuildVersion: 1.0; BuildDate: BUILDDATETIME)   6.0.0.24
   WRServices.dll   WRServices Friday January 27 2012 13:22:12   Build 0.17112   0.17112
Required plug-ins:
   3D Studio 13.1.2 (13.1.2 20130105.r.224 2013/01/05:23:00:00)
   Accented Edges 13.0
   Adaptive Wide Angle 13.0
   Angled Strokes 13.0
   Average 13.1.2 (13.1.2 20130105.r.224 2013/01/05:23:00:00)
   Bas Relief 13.0
   BMP 13.0
   Camera Raw 7.3
   Chalk & Charcoal 13.0
   Charcoal 13.0
   Chrome 13.0
   Cineon 13.1.2 (13.1.2 20130105.r.224 2013/01/05:23:00:00)
   Clouds 13.1.2 (13.1.2 20130105.r.224 2013/01/05:23:00:00)
   Collada 13.1.2 (13.1.2 20130105.r.224 2013/01/05:23:00:00)
   Color Halftone 13.0
   Colored Pencil 13.0
   CompuServe GIF 13.0
   Conté Crayon 13.0
   Craquelure 13.0
   Crop and Straighten Photos 13.1.2 (13.1.2 20130105.r.224 2013/01/05:23:00:00)
   Crop and Straighten Photos Filter 13.0
   Crosshatch 13.0
   Crystallize 13.0
   Cutout 13.0
   Dark Strokes 13.0
   De-Interlace 13.0
   Dicom 13.0
   Difference Clouds 13.1.2 (13.1.2 20130105.r.224 2013/01/05:23:00:00)
   Diffuse Glow 13.0
   Displace 13.0
   Dry Brush 13.0
   Eazel Acquire 13.1.2 (13.1.2 20130105.r.224 2013/01/05:23:00:00)
   Embed Watermark 4.0
   Entropy 13.1.2 (13.1.2 20130105.r.224 2013/01/05:23:00:00)
   Extrude 13.0
   FastCore Routines 13.1.2 (13.1.2 20130105.r.224 2013/01/05:23:00:00)
   Fibers 13.0
   Film Grain 13.0
   Filter Gallery 13.0
   Flash 3D 13.1.2 (13.1.2 20130105.r.224 2013/01/05:23:00:00)
   Fresco 13.0
   Glass 13.0
   Glowing Edges 13.0
   Google Earth 4 13.1.2 (13.1.2 20130105.r.224 2013/01/05:23:00:00)
   Grain 13.0
   Graphic Pen 13.0
   Halftone Pattern 13.0
   HDRMergeUI 13.0
   IFF Format 13.0
   Ink Outlines 13.0
   JPEG 2000 13.0
   Kurtosis 13.1.2 (13.1.2 20130105.r.224 2013/01/05:23:00:00)
   Lens Blur 13.0
   Lens Correction 13.0
   Lens Flare 13.0
   Liquify 13.0
   Matlab Operation 13.1.2 (13.1.2 20130105.r.224 2013/01/05:23:00:00)
   Maximum 13.1.2 (13.1.2 20130105.r.224 2013/01/05:23:00:00)
   Mean 13.1.2 (13.1.2 20130105.r.224 2013/01/05:23:00:00)
   Measurement Core 13.1.2 (13.1.2 20130105.r.224 2013/01/05:23:00:00)
   Median 13.1.2 (13.1.2 20130105.r.224 2013/01/05:23:00:00)
   Mezzotint 13.0
   Minimum 13.1.2 (13.1.2 20130105.r.224 2013/01/05:23:00:00)
   MMXCore Routines 13.1.2 (13.1.2 20130105.r.224 2013/01/05:23:00:00)
   Mosaic Tiles 13.0
   Multiprocessor Support 13.1.2 (13.1.2 20130105.r.224 2013/01/05:23:00:00)
   Neon Glow 13.0
   Note Paper 13.0
   NTSC Colors 13.1.2 (13.1.2 20130105.r.224 2013/01/05:23:00:00)
   Ocean Ripple 13.0
   Oil Paint 13.0
   OpenEXR 13.0
   Paint Daubs 13.0
   Palette Knife 13.0
   Patchwork 13.0
   Paths to Illustrator 13.0
   PCX 13.1.2 (13.1.2 20130105.r.224 2013/01/05:23:00:00)
   Photocopy 13.0
   Photoshop 3D Engine 13.1.2 (13.1.2 20130105.r.224 2013/01/05:23:00:00)
   Picture Package Filter 13.1.2 (13.1.2 20130105.r.224 2013/01/05:23:00:00)
   Pinch 13.0
   Pixar 13.1.2 (13.1.2 20130105.r.224 2013/01/05:23:00:00)
   Plaster 13.0
   Plastic Wrap 13.0
   PNG 13.0
   Pointillize 13.0
   Polar Coordinates 13.0
   Portable Bit Map 13.1.2 (13.1.2 20130105.r.224 2013/01/05:23:00:00)
   Poster Edges 13.0
   Radial Blur 13.0
   Radiance 13.1.2 (13.1.2 20130105.r.224 2013/01/05:23:00:00)
   Range 13.1.2 (13.1.2 20130105.r.224 2013/01/05:23:00:00)
   Read Watermark 4.0
   Reticulation 13.0
   Ripple 13.0
   Rough Pastels 13.0
   Save for Web 13.0
   ScriptingSupport 13.1.2
   Shear 13.0
   Skewness 13.1.2 (13.1.2 20130105.r.224 2013/01/05:23:00:00)
   Smart Blur 13.0
   Smudge Stick 13.0
   Solarize 13.1.2 (13.1.2 20130105.r.224 2013/01/05:23:00:00)
   Spatter 13.0
   Spherize 13.0
   Sponge 13.0
   Sprayed Strokes 13.0
   Stained Glass 13.0
   Stamp 13.0
   Standard Deviation 13.1.2 (13.1.2 20130105.r.224 2013/01/05:23:00:00)
   STL 13.1.2 (13.1.2 20130105.r.224 2013/01/05:23:00:00)
   Sumi-e 13.0
   Summation 13.1.2 (13.1.2 20130105.r.224 2013/01/05:23:00:00)
   Targa 13.0
   Texturizer 13.0
   Tiles 13.0
   Torn Edges 13.0
   Twirl 13.0
   Underpainting 13.0
   Vanishing Point 13.0
   Variance 13.1.2 (13.1.2 20130105.r.224 2013/01/05:23:00:00)
   Variations 13.1.2 (13.1.2 20130105.r.224 2013/01/05:23:00:00)
   Water Paper 13.0
   Watercolor 13.0
   Wave 13.0
   Wavefront|OBJ 13.1.2 (13.1.2 20130105.r.224 2013/01/05:23:00:00)
   WIA Support 13.1.2 (13.1.2 20130105.r.224 2013/01/05:23:00:00)
   Wind 13.0
   Wireless Bitmap 13.1.2 (13.1.2 20130105.r.224 2013/01/05:23:00:00)
   ZigZag 13.0
Optional and third party plug-ins:
   DAZ Studio 3D Bridge 12.0
   DazUpdateScene 12.0
Plug-ins that failed to load: NONE
Flash:
   Mini Bridge
   Kuler
Installed TWAIN devices: NONE

Great news!
I followed your suggestion, Noel, and uninstalled my drivers with the Catalyst Uninstall Utility (which I hadn't used before), rebooted, reinstalled Catalyst 13.2 Beta 7, rebooted, deleted the PS Prefs, started PS, and now the performance is radically improved!
It baffles me why I would need to do a clean driver uninstall in a new system environment that has only ever had this video card, and is only a few months old, but that action seems to be what's improved the situation. Note that because I deleted the PS preferences, the good performance now occurs with the default Use Graphics Processor enabled, and Drawing Mode set to Advanced (with every feature in the Advanced dialog checked except 30bit display).
Having no reference point, I can't tell for sure if performance is as good as it theoretically ought to be for my system specs, but using the standard 13px brush is only slightly laggy behind the cursor, even if I become reckless and squiggle on the canvas violently. It wasn't just sluggish response before: Photoshop seemed to be in pain trying to draw the line segments as it laboured to catch up to the cursor. That is pretty much gone now.
Much more tellingly, zooming and panning the canvas is like it ought to be, responsive and clean, more or less like it was for me in CS4 with my old Nvidia 9600GT. The poor performance with zooming and panning was the most worrying aspect of the issue. It's a great relief to see these working more properly now.
I have to confess I'm a little embarrassed to have drug you through all this hassle only to discover that something as rudimentary as properly cleaning out the drivers would be the apparent solution. I never would have imagined that doing that, with such a new and stable system, would make any difference, since I don't have a legacy of older drivers dotting my hard drive. In any event, I'm really grateful that you guys took the time to try to help me.
In the interest of completeness, here's the relevant portion of my system info after doing the reinstall steps I mentioned above:
Adobe Photoshop Version: 13.1.2 (13.1.2 20130105.r.224 2013/01/05:23:00:00) x64
Operating System: Windows 8 64-bit
Version: 6.2
System architecture: Intel CPU Family:6, Model:14, Stepping:5 with MMX, SSE Integer, SSE FP, SSE2, SSE3, SSE4.1, SSE4.2
Physical processor count: 4
Processor speed: 2665 MHz
Built-in memory: 16379 MB
Free memory: 13680 MB
Memory available to Photoshop: 14695 MB
Memory used by Photoshop: 60 %
Image tile size: 1024K
Image cache levels: 4
OpenGL Drawing: Enabled.
OpenGL Drawing Mode: Advanced
OpenGL Allow Normal Mode: True.
OpenGL Allow Advanced Mode: True.
OpenGL Allow Old GPUs: Not Detected.
OpenCL Version: 3.0
OpenGL Version: 3.0
Video Rect Texture Size: 16384
OpenGL Memory: 2048 MB
Video Card Vendor: ATI Technologies Inc.
Video Card Renderer: AMD Radeon HD 7800 Series
Display: 1
Display Bounds: top=0, left=0, bottom=1080, right=1920
Video Card Number: 2
Video Card: AMD Radeon HD 7800 Series
Driver Version:
Driver Date:
Video Card Driver: aticfx64.dll,aticfx64.dll,aticfx64.dll,aticfx32,aticfx32,aticfx32,atiumd64.dll,atidxx64.d ll,atidxx64.dll,atiumdag,atidxx32,atidxx32,atiumdva,atiumd6a.cap,atitmm64.dll
Video Mode: 1920 x 1080 x 4294967296 colors
Video Card Caption: AMD Radeon HD 7800 Series
Video Card Memory: 2048 MB
Video Card Number: 1
Video Card: Microsoft Basic Render Driver
Driver Version: 12.100.17.0
Driver Date: 20130226000000.000000-000
Video Card Driver:
Video Mode:
Video Card Caption: Microsoft Basic Render Driver
Video Card Memory: 0 MB
As you can see, the Microsoft Basic Render Driver still appears as a Video Card in the list. This presumably has something to do with Windows 8, and I really don't know if its presence here is still a sign that my card is not being used to its optimal capability. I have a hunch that the slight lag that I am still experiencing with the brush when Use Graphics Processor is on -- totally absent with the acceleration turned off -- implies that Photoshop is still unable to take maximum advantage of my card. I would assume that the brush tool should be more responsive with acceleration on than off, in a rig without any issues, but that's just assumption on my part. If you turn off Use Graphics Processor on your systems, is the brush tool more or less responsive?
But again, panning the canvas with the hand tool is now extremely responsive, without any screen tearing or visible lag, and that's a massive improvement over the total meltdown of performance I was suffering from before.
Thanks again very much for your help. I'm grateful to all of you who took the time to chime in.

How do I access "Firefox is NOT compatible with this application. For best performance, please use Internet Explorer 5.0 and above...." web sites; when I try to download any alternate browser, then a warning that alternate is "imcompatable with your opera

How do I access websites that warn: "Firefox is NOT compatible with this application. For best performance, please use Internet Explorer 5.0 and above...."? When I try to download any alternate browser, all I get is another warning that the alternate is "not compatible with your operating system." Is Firefox preventing this? The site listed below is a job application site. I've had this same problem with other job application sites also.
== URL of affected sites ==
https://storefront.kenexa.com/lithia/cc/Home.ss

There should be a User Agent Switcher menu item under Tools, which gives you the browser names you can impersonate.
The menu item name changes to the browser UA you are presently using.
There is also a User Agent Switcher button, you can add it using View -> Toolbars -> Customize, and dragging the button to your toolbar.
See http://chrispederick.com/work/user-agent-switcher/features/ and http://chrispederick.com/work/user-agent-switcher/help/
You can just start trying IE versions (or the versions it says on the site) until it lets you in.

Help with Video Performance Issues using Flash

Asking on behalf of a customer who has been unable to get any answers so far - are you able to help?
Background:
We have a port of our Game Development Kit which allows us to recompile all our games using Crossbridge (http://adobe-flash.github.io/crossbridge/) into SWF without any code modifications.
Overview:
Our framework is using OpenGL for rendering and we have successfully ported it along with the audio and video to run in Flash.
We are experiencing performance issues using Video. We cannot use image sequence as some of the video animations are too long and would increase the download to an unacceptable size. Assets vary between 256x256 - 1024x1024 videos.

Here's the rest of the story. Let me know if you can see any resolution, and I will connect him to the forums. Thank you.
Current Video Solution:
We create an instance of NetConnection, NetStream, and Video according to most samples out there, and invoke draw to rasterize the Video DisplayObject into a BitmapData instance.
The BitmapData instance has a fixed color component layout which is not compatible with Stage3D texture and is therefore has to be reformatted before uploaded to Stage3D Texture (See Code Listing below).
Our Problems:
Performance issues with RGBA conversion (either using copyChannel or manually reformatting is not fast enough) natively in as3; this required for stage3d texture.Copying each channel individual using bitmapdata.Copychannel seems faster, but not significantly faster.
Cannot detect when video frame has been updated, therefore we may copy pixels that are not needed in enterframe (processpixel).
Looping video, our current solution uses the NET_STATUS event Buffer empty; Is there a better way to loop videos than checking buffer and seeking to 0.
Stepping video, loading FLV or MP4 side by side assets from HTTP or embedded does not support stepping? Is there another way?
ActionScript Code Listing:
video_nc = new NetConnection();
video_nc.addEventListener(NetStatusEvent.NET_STATUS , onConnect);
video_nc.addEventListener(AsyncErrorEvent.ASYNC_ERROR , trace);
video_nc.connect(null);
// OnConnect Event:
this.ns = new NetStream(e.target as NetConnection);
eventclient = new Object();
eventclient.onMetaData = onMetaData;
this.ns.client = eventclient;
ns.play(flvfile);
ns.pause();
//onMetaData event:
this.width = infoObject.width;
this.height = infoObject.height;
this.textureWidth = NextPowerOfTwo(this.width);
this.textureHeight = NextPowerOfTwo(this.height);
cliprect = new Rectangle(0, 0, this.width ,this.height);
cliprect.x = 0;
cliprect.y = 0;
cliprect.width = this.textureWidth;
cliprect.height = this.textureHeight;
totalFrames = infoObject.duration * infoObject.fps;
this.hasAlpha = true;
if(infoObject.videocodecid == 5)
this.hasAlpha = true;
this.bitmapData = new BitmapData(this.textureWidth, this.textureHeight, hasAlpha, 0xff000000);
this.video = new Video(this.width, this.height);
this.video.attachNetStream(ns);
this.video.addEventListener(Event.ENTER_FRAME, processPixels);
// processPixel method:
BitmapData.draw(video);
GLAPI.instance.glBindTexture(GLAPI.GL_TEXTURE_2D,this.textureId);
var fmt:uint = GLAPI.GL_ARGB;
// converting pixels using copychannel or loop through pixels
GLAPI.instance.glBindTexture(GLAPI.GL_TEXTURE_2D,this.textureId);
GLAPI.instance.glTexImage2D(GLAPI.GL_TEXTURE_2D, 0, fmt, this.textureWidth, this.textureHeight, 0,fmt, GLAPI.GL_UNSIGNED_BYTE, 0, convBitmapData.getPixels(cliprect));

I have about 10000 images of different persons with dimension of 640*480. I wan to crop face from these images to dimension of 200*280. The location of face varies in differnt pics. So, please let me know step by step how can I perform this using the Ligh

I have about 10000 images of different persons with dimension of 640*480. I wan to crop face from these images to dimension of 200*280. The location of face varies in differnt pics. So, please let me know step by step how can I perform this using the Lightroom software. Also I wan to know what should be the aspect ratio to do so.Thank you in advance

The aspect ratio should be set to 200x280, or equivalently 5x7.
I don't think it is possible to do the cropping automatically in Lightroom, you'd have to do this image by image to crop the faces correctly.

Performance issue with using buffering in a APPL0 or APPL1 Table

Hi,
Can anyone please tell me whether there's any serious performace issue with using buffering for a Master or Transaction table? I'm asking this because when I run code inspector for my transp table I'm getting information message:
Message Code 0011 ==> Buffereing is Activated but Delivery Class Is "A" and Message Code 0014 ==> Buffereing is Activated but Data Class Is "APPL1".
So what's other way round for improving performance.
Thanks,
Mahesh M.S.

Hi,
have you read the documentation?
Let me paste it here for you:
Buffering is switched on for the examined table and it has data type 'APPL0' or 'APPL1'.
Tables with data type 'APPL0' or 'APPL1' should contain master or transaction data, so these tables should either contain a large amount of data or their content should change frequently. Therefore buffering the table is unfavourable. Very large tables suppress other tables in the buffer memory and hence slow done any access to them. Transaction data should not be buffered because the synchronization of the changes on the various application servers is very time consuming.
In exceptional cases, small master data tables ('APPL0', size category 0) can be buffered.
The solution depends on the table content. If it is master or transaction data, the table should not be buffered. If the table content does not consist of master or transaction data, the data type should be corrected accordingly.
This should answer your questions...
Kind regards,
Hermann

Oracle: slow performance with SELECT using ojdbc14 and connection pooling

Hello,
i'm working hard the last days to solve a performance problem with our customer using a oracle 10g database. For testing I used our oracle 9.2.0.1.0 database which shows the same symptoms. All doing solved nothing: the performance while using this oracle is much slower than other databases. This result I cannot trust and so I need some advice. What is missing to improve the performance on the java side?
The webapplication I use runs fast on MySQL 4.x and SQLServer 2000, but on the above mentioned Oracle it was always 4 times slower. The webapplication uses a lot of simple SELECT-Statements without complicated joins and so on (because it should run on many different databases). Doing some days of creating tests within this webapplication, I was not able to find any entrance point for a change. All databases server I'm using, having only the default configurations after a common installation.
To reduce the complexity I wrote a simple java application with connection pooling using only the latest libraries from apache-commons(dbcp, pool), and the latest ojdbc14 for oracle 9.2.
First the results than the code: MySQL needed less than 1000 millisecond, SQLServer around 1000 milliseconds and Oracle over 2000 milliseconds. I stopped pooling and the results are for Oracle even worse: over 18000 milliseconds (mysql:2500, sqlserver:4100).
I changed the classes for Oracle and used the class oracle.jdbc.pool.OracleConnectionCacheImpl from the ojdbc14-library. No difference (around 100 milliseconds more or less).
The only Select-Statement works on this table, which has one index on HICTGID.
It contains 259 entrances.:
CREATE TABLE HIERARCHYCATEGORY (
HICTGID                 NUMBER (19)   NOT NULL,
HICTGLEVEL              NUMBER (10)   NOT NULL,
HICTGEXTID              NUMBER (19)   NOT NULL,
HICTGEXTPARENTID        NUMBER (19)   NOT NULL,
HICTGNAME               VARCHAR2(255) NOT NULL
);The application simply loops through this table using
SELECT Hictgid, Hictgname FROM HIERARCHYCATEGORY WHERE HICTGID = ?, but I always open a connection before this query and closes this connection afterwards. So I use the pooling as much as possible. That's all SQL I'm using.
    protected static DataSource setupDataSource(String sDriver, String sUrl, String sUser, String sPwd) throws SQLException {
        BasicDataSource ds = new BasicDataSource();
        ds.setDriverClassName(sDriver);
        ds.setUsername(sUser);
        ds.setPassword(sPwd);
        ds.setUrl(sUrl);
        // The maximum number of active connections:
        ds.setMaxActive(3);
        // The maximum number of active connections that can remain idle in the pool,
        // without extra ones being released, or zero for no limit:
        ds.setMaxIdle(3);
        // The maximum number of milliseconds that the pool will wait (when there are no available connections)
        // for a connection to be returned before throwing an exception, or -1 to wait indefinitely:
        ds.setMaxWait(3000);
        return ds;
    }I can switch by using external properties between three databases (oracle, mysql and sqlserver) and if I want I can switch pooling off. And all actions I'm interested are logged by Log4J.
    public static Connection getConnection() throws SQLException {
        Connection result = null;
        String sJdbcDriver = m_oJbProp.getString("jdbcDriver");
        String sJdbcUrl = m_oJbProp.getString("databaseConnection");
        String sJdbcUser = m_oJbProp.getString("dbUsername");
        String sJdbcPwd = m_oJbProp.getString("dbPassword");
            try {
                if (m_oJbProp.getString("useConnectionPooling").equals("true")) {
                     if (log.isDebugEnabled()) {
                          log.debug("ConnectionPooling true");
                    if(null == m_ds) {
                        m_ds = setupDataSource(sJdbcDriver,sJdbcUrl,sJdbcUser,sJdbcPwd);
                          if (log.isDebugEnabled()) {
                               log.debug("DataSource created");
                    result = m_ds.getConnection();
                } else {
                    // No connection pooling:
                     if (log.isDebugEnabled()) {
                          log.debug("ConnectionPooling false");
                    try {
                        Class.forName(sJdbcDriver);
                        result = DriverManager.getConnection(sJdbcUrl, sJdbcUser, sJdbcPwd);
                    } catch (ClassNotFoundException cnf) {
                        log.error("Exception: Class Not Found. ", cnf);
                        System.exit(0);
(.. ErrorHandling ...)Here is the code fragment which is doing the work:
                 StringBuffer sb = new StringBuffer();
            while (lNextBottom <= lNextCeiling) {
                 con = getConnection();
                 innerSelStmt = con.prepareStatement("SELECT Hictgid, Hictgname FROM HIERARCHYCATEGORY WHERE HICTGID = ?");
                 innerSelStmt.setLong(1, lNextBottom);
                 rsInner = innerSelStmt.executeQuery();
                 if ((rsInner != null) && (rsInner.next())) {
                     sb.append(rsInner.getLong(1) + ", " + rsInner.getString(2) + "\r");
                      if (log.isDebugEnabled()) {
                           log.debug("Inner Statement: " + rsInner.getLong(1) + "\r");
                 rsInner.close();
                 con.close();
                 lNextBottom++;
             if (log.isInfoEnabled()) {
                  log.info("\rResult values: Hictgid, Hictgname \r");
                  log.info(sb.toString());
             }and the main method:
    public static void main(String[] args) {
        try {
             long lStartTime = System.currentTimeMillis();
             JdbcBasic oJb = new JdbcBasic();
             boolean bSuccess = false;
             bSuccess = oJb.getHierarchycategories();
             if (log.isInfoEnabled()) {
                  log.info("Running time: " + (System.currentTimeMillis() - lStartTime));
             if (null != m_ds) {
                 printDataSourceStats(m_ds);
                  shutdownDataSource(m_ds);
                  if (log.isInfoEnabled()) {
                       log.info("Datasource closed.");
         } catch (SQLException sqe) {
              log.error("SQLException within main-method", sqe);
    }My database values are
databaseConnection=jdbc:oracle:thin:@SERVERDB:1521:ora
jdbcDriver=oracle.jdbc.driver.OracleDriver
databaseConnection=jdbc:jtds:sqlserver://SERVERDB:1433/testdb
jdbcDriver=net.sourceforge.jtds.jdbc.Driver
databaseConnection=jdbc:mysql://localhost/testdb
jdbcDriver=com.mysql.jdbc.Driver
dbUsername=testusr
dbPassword=testpwdThanks for your reading and maybe for your help.

A few comments.
There is of course another difference between your test cases then just the database. There is also the driver. And I suspect that in at least the case with the jtds driver it is helping you along where you are doing something silly and the Oracle driver is not.
Before I explain the next part I would say the speed differences between MS-SQL and MySQL look about right I think you are aiming here for MS-SQL level performance not MySQL. (For a bunch of reasons MySQL is inherently faster but there are MANY drawbacks as well which have been well discussed on previous threads)
Here is where I believe your problem lies
while (lNextBottom <= lNextCeiling) {
                 con = getConnection();
                 innerSelStmt = con.prepareStatement("SELECT Hictgid, Hictgname FROM HIERARCHYCATEGORY WHERE HICTGID = ?");
                 innerSelStmt.setLong(1, lNextBottom);
                 rsInner = innerSelStmt.executeQuery();
                 if ((rsInner != null) && (rsInner.next())) {
                     sb.append(rsInner.getLong(1) + ", " + rsInner.getString(2) + "\r");
                      if (log.isDebugEnabled()) {
                           log.debug("Inner Statement: " + rsInner.getLong(1) + "\r");
                 rsInner.close();
                 con.close();
                 lNextBottom++;
             }There at least four things that are wrong with above.
1) Why are you preparing the statement INSIDE the loop. Let us for a moment say that the loop will spin 100 times. That means that you are preparing the same statement 100 times. This is bad. It is also very relevant because for example the Jtds driver is going to be caching the prepared statements you make so that actually while you try and prepare it 100 times it only actually does it once... but in Oracle I don't know what it is doing for sure but if it is preparing on each pass well than that bit of it is going take 100 times longer then it should.
2) You are opening and closing the connection on each pass through the loop... also a terrible idea. You need to fix this first so that you can repeatedly use the same prepared statement.
3) Why are you looping in the first place? More on this later.
4) Where do you close the PreparedStatement? It doesn't look like you do.
Okay so for starters your loop should look a lot more like this...
code]
con = getConnection();
innerSelStmt = con.prepareStatement("SELECT Hictgid, Hictgname FROM HIERARCHYCATEGORY WHERE HICTGID = ?");
while (lNextBottom <= lNextCeiling) {
innerSelStmt.setLong(1, lNextBottom);
rsInner = innerSelStmt.executeQuery();
if ((rsInner != null) && (rsInner.next())) {
sb.append(rsInner.getLong(1) + ", " + rsInner.getString(2) + "\r");
rsInner.close();
lNextBottom++;
innerSelStmt.close();
con.close();
I think the code above (and you can put your debug stuff back if you want) which uses ONE connection and ONE prepared Statement will improve your performance dramatically.
The other question though I would as is why in the hell you are doing 100 or whatever number of queries anyway. This can be done all in ONE query which again will improve performance.
Your query and such should look like this I think.
String sql = "SELECT Hictgid, Hictgname FROM HIERARCHYCATEGORY WHERE HICTGID >=? AND HICTGID<=?";
PreparedStatement ps = conn.prepareStatement(sql);
ps.setLong(1,lNextBottom );
ps.setLong(2,lNextCeiling);
ResultSet rs = ps.executeQuery();
while(rs.next()){
// your appending to string buffer code goes here
}and I can't understand why you're not doing that in the first place.

Performance issue with using out parameter sys_refcursor

Hello,
I'm using Oracle 10g, with ODP.Net in a C# application.
I'm using about 10 stored procedures, each having one out parameter of sys_refcursor type. when I use one function in C# and call these 10 sp's, it takes about 78ms to excute the function.
Now to improve the performance, I created one SP with 10 output parameters of sys_refcursor type. and i just call this one sp. the time taken has increased , not it takes abt 95ms.
is this the right approach or how can we improve the performance by using sys_refcursor.
please suggest, it is urgent, i'm stuck up with this issue.
thanks
shruti

With 78ms and 95ms are you talking about milliseconds or minutes? If it's milliseconds then what's the problem and does it really matter if there is a difference of 17 milliseconds as that could just be caused by network traffic or something. If you're talking minutes, then we would need more information about what you are attempting to do, what tables and processing is going on, what indexes you have etc.
Query optimisation tips can be found on this thread.. When your query takes too long ....
Without more information we can't really tell what's happening.

Using DBMS_LOCK in function gives error

Dear Guru's
I need to use the DBMS_LOCK.sleep. Hence to get more info i searched the forum and I found this code from the forum
CREATE OR REPLACE
FUNCTION sleep (secs_in IN INTEGER) RETURN NUMBER
is
BEGIN
DBMS_LOCK.sleep(secs_in);
RETURN secs_in;
END;
and tried it in my envrionment..
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production With the Partitioning, OLAP and Data Mining options
SQL*Plus: Release 10.1.0.4.2
Warning: Function created with compilation errors.
SQL> show errors
Errors for FUNCTION SLEEP:
LINE/COL ERROR
4/5 PL/SQL: Statement ignored
4/5 PLS-00201: identifier 'DBMS_LOCK' must be declared
I tried using the DBMS_LOCK in a Nameless procedure like this
begin
dbms_lock.sleep(5);
end;
there was no error message and i got a message that it has been executed successfully
I tried it similarly in a stored procedure , then also i got the same error message
Please enlighten me on this issue.
with warm regards
ssr

Sounds like you've got execute privs on dbms_lock granted to your user as part of a role. You need to have a direct grant on dbms_lock in order for what you're trying to do to work. (ie. you need to get someone with the appropriate privs to run the following: grant excute on dbms_lock to your_user;)

SCHEDULER with using dbms_job.submit package

i want to use a procedure in SCHEDULER with using dbms_job.
How i use this procedure in SCHEDULER
Plz, Help me
Message was edited by:
Nilesh Hole

Hi,
For 10g and up you should be using dbms_scheduler for scheduling. Some examples are here
http://download.oracle.com/docs/cd/B28359_01/server.111/b28310/scheduse.htm#i1033533
and the homepage is at
http://www.oracle.com/technology/products/database/scheduler/index.html
Here's an example that runs daily at 2am
begin
dbms_scheduler.create_job('myjob',
    job_type=>'plsql_block',
    job_action=>'dbms_lock.sleep(10);',
    start_date=>null,
    repeat_interval=>'freq=daily;byhour=2;byminute=0',
    enabled=>true , auto_drop=>true
end;
/Hope this helps,
Ravi.

Report performance with Hierarchies

Hi
How to improve query performance with hierarchies. We have to do lot of navigation's in the query and the volume of data size very big.
Thanks
P G

HI,
chk this:
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/1955ba90-0201-0010-d3aa-8b2a4ef6bbb2
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/ce7fb368-0601-0010-64ba-fadc985a1f94
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/4c0ab590-0201-0010-bd9a-8332d8b4f09c
Query Performance Is "Aggregates" the way out for me?
/people/vikash.agrawal/blog/2006/04/17/query-performance-150-is-aggregates-the-way-out-for-me
° the OLAP cache is architected to store query result sets and to give all users access to those result sets.
If a user executes a query, the result set for that querys request can be stored in the OLAP cache; if that same query (or a derivative) is then executed by another user, the subsequent query request can be filled by accessing the result set already stored in the OLAP cache.
In this way, a query request filled from the OLAP cache is significantly faster than queries that receive their result set from database access
° The indexes that are created in the fact table for each dimension allow you to easily find and select the data
see http://help.sap.com/saphelp_nw04/helpdata/en/80/1a6473e07211d2acb80000e829fbfe/content.htm
° when you load data into the InfoCube, each request has its own request ID, which is included in the fact table in the packet dimension.
This (besides giving the possibility to manage/delete single request) increases the volume of data, and reduces performance in reporting, as the system has to aggregate with the request ID every time you execute a query. Using compressing, you can eliminate these disadvantages, and bring data from different requests together into one single request (request ID 0).
This function is critical, as the compressed data can no longer be deleted from the InfoCube using its request IDs and, logically, you must be absolutely certain that the data loaded into the InfoCube is correct.
see http://help.sap.com/saphelp_nw04/helpdata/en/ca/aa6437e7a4080ee10000009b38f842/content.htm
° by using partitioning you can split up the whole dataset for an InfoCube into several, smaller, physically independent and redundancy-free units. Thanks to this separation, performance is increased when reporting, or also when deleting data from the InfoCube.
see http://help.sap.com/saphelp_nw04/helpdata/en/33/dc2038aa3bcd23e10000009b38f8cf/content.htm
Hope it helps!
tHAK YOU,
dst

Performance with the new Mac Pros?

I sold my old Mac Pro (first generation) a few months ago in anticipation of the new line-up. In the meantime, I purchased a i7 iMac and 12GB of RAM. This machine is faster than my old Mac for most Aperture operations (except disk-intensive stuff that I only do occasionally).
I am ready to purchase a "real" Mac, but I'm hesitating because the improvements just don't seem that great. I have two questions:
1. Has anyone evaluated qualitative performance with the new ATI 5870 or 5770? Long ago, Aperture seemed pretty much GPU-constrained. I'm confused about whether that's the case anymore.
2. Has anyone evaluated any of the new Mac Pro chips for general day-to-day use? I'm interested in processing through my images as quickly as possible, so the actual latency to demosaic and render from the raw originals (Canon 1-series) is the most important metric. The second thing is having reasonable performance for multiple brushed-in effect bricks.
I'm mostly curious if anyone has any experience to point to whether it's worth it -- disregarding the other advantages like expandability and nicer (matte) displays.
Thanks.
Ben

Thanks for writing. Please don't mind if I pick apart your statements.
"For an extra $200 the 5870 is a no brainer." I agree on a pure cost basis that it's not a hard decision. But I have a very quiet environment, and I understand this card can make a lot of noise. To pay money, end up with a louder machine, and on top of that realize no significant benefit would be a minor disaster.
So, the more interesting question is: has anyone actually used the 5870 and can compare it to previous cards? A 16-bit 60 megapixel image won't require even .5GB of VRAM if fully tiled into it, for example, so I have no ability, a priori, to prove to myself that it will matter. I guess I'm really hoping for real-world data. Perhaps you speak from this experience, Matthew? (I can't tell.)
Background work and exporting are helpful, but not as critical for my primary daily use. I know the CPU is also used for demosaicing or at least some subset of the render pipeline, because I have two computers that demonstrate vastly different render-from-raw response times with the same graphics card. Indeed, it is this lag that would be the most valuable of all for me to reduce. I want to be able to flip through a large shoot and see each image at 100% as instantaneously as possible. On my 2.8 i7 that process takes about 1 second on average (when Aperture doesn't get confused and mysteriously stop rendering 100% images).
Ben

Performance with external display

Hello,
when I'm connecting my 19'' TFT to the MacBook the performance (with the same applications runnig) is realy bad. It tooks longer to switch between apps and if I don't use an app for some time, it can took up to 30 sec to "reactivate" the app.
Because the HD is working when I switch apps, it looks like the OS is swapping. My question: Would it help to upgrade the MacBook to 2GB ram? AFAIC the intel card uses shared memory.
Thanks for your help
Till
MacBook 1.83 GHz/1GB Mac OS X (10.4.8)

How much RAM do you have? Remember that the MB does not have dedicated VRAM like some computers do and that it uses the system RAM to drive the graphics chipset.
I use my MB with the mini-DVI to DVI adapter to drive a 20" widescreen monitor without any of the problems that you describe, but I have 2GB of RAM. If you only have the stock 512MB of RAM, that may be part of what you are seeing.

Performance with LinkedList in java

Hello All,
Please suggest me any solution to further improve the performance with List.
The problem description is as follows:
I have a huge number of objects, lets say 10,000 , and need to store the objects in such a collection so that if i want to store an object at some particular index i , I get the best performance.
I suppose as I need indexed based access, using List makes the best sense as Lists are ordered.
Using LinkedList over ArrayList gives the better performance in the aforementioned context.
Is there are way I can further improve the performance of LinkedList while solving this particular problem
OR
Is there any other index based collection using that i get better performance than LinkedList?
Thanks in advance

The trouble with a LinkedList as implemented in the Java libraries is that if you want to insert at index 100, it has no option but to step through the first 100 links of the list to find the insert point. Likewise is you retrieve by index. The strength of the linked list approach is lost if you work by index and the List interface gives no other way to insert in the middle of the list. The natural interface for a linked list would include an extended Iterator with methods for insert and replace. Of course LinkedLists are fine when you insert first or last.
My guess would be that if your habitual insertion point was half way or more through the list then ArrayList would serve you better especially if you leave ample room for growth. Moving array elements up is probably not much more expensive, per element, than walking the linked list. Maybe 150% or thereabouts.
Much depends on how you retrieve, and how volatile the list is. Certainly if you are a read-mostly situation and cannot use an iterator then a LinkedList won't suit.

Performance with dates in the where clause

Performance with dates in the where clause
CREATE TABLE TEST_DATA
FNUMBER NUMBER,
FSTRING VARCHAR2(4000 BYTE),
FDATE DATE
create index t_indx on test_data(fdata);
query 1: select count(*) from TEST_DATA where trunc(fdate) = trunc(sysdate);
query 2: select count(*) from TEST_DATA where fdate between trunc(sysdate) and trunc(SYSDATE) + .99999;
query 3: select count(*) from TEST_DATA where fdate between to_date('21-APR-10', 'dd-MON-yy') and to_date('21-APR-10 23:59:59', 'DD-MON-YY hh24:mi:ss');
My questions:
1) Why isn't the index t_indx used in Execution plan 1?
2) From the execution plan, I see that query 2 & 3 is better than query 1. I do not see any difference between execution plan 2 & 3. Which one is better?
3) I read somewhere - "Always check the Access Predicates and Filter Predicates of Explain Plan carefully to determine which columns are contributing to a Range Scan and which columns are merely filtering the returned rows. Be sceptical if the same clause is shown in both."
Is that true for Execution plan 2 & 3?
3) Could some one explain what the filter & access predicate mean here?
Thanks in advance.
Execution Plan 1:
SQL> select count(*) from TEST_DATA where trunc(fdate) = trunc(sysdate);
COUNT(*)
283
Execution Plan
Plan hash value: 1486387033
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
| 0 | SELECT STATEMENT | | 1 | 9 | 517 (20)| 00:00:07 |
| 1 | SORT AGGREGATE | | 1 | 9 | | |
|* 2 | TABLE ACCESS FULL| TEST_DATA | 341 | 3069 | 517 (20)| 00:00:07 |
Predicate Information (identified by operation id):
2 - filter(TRUNC(INTERNAL_FUNCTION("FDATE"))=TRUNC(SYSDATE@!))
Note
- dynamic sampling used for this statement
Statistics
4 recursive calls
0 db block gets
1610 consistent gets
0 physical reads
0 redo size
412 bytes sent via SQL*Net to client
380 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
1 rows processed
Execution Plan 2:
SQL> select count(*) from TEST_DATA where fdate between trunc(sysdate) and trunc(SYSDATE) + .99999;
COUNT(*)
283
Execution Plan
Plan hash value: 1687886199
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
| 0 | SELECT STATEMENT | | 1 | 9 | 3 (0)| 00:00:01 |
| 1 | SORT AGGREGATE | | 1 | 9 | | |
|* 2 | FILTER | | | | | |
|* 3 | INDEX RANGE SCAN| T_INDX | 283 | 2547 | 3 (0)| 00:00:01 |
Predicate Information (identified by operation id):
2 - filter(TRUNC(SYSDATE@!)<=TRUNC(SYSDATE@!)+.9999884259259259259259
259259259259259259)
3 - access("FDATE">=TRUNC(SYSDATE@!) AND
"FDATE"<=TRUNC(SYSDATE@!)+.999988425925925925925925925925925925925
9)
Note
- dynamic sampling used for this statement
Statistics
7 recursive calls
0 db block gets
76 consistent gets
0 physical reads
0 redo size
412 bytes sent via SQL*Net to client
380 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
1 rows
Execution Plan 3:
SQL> select count(*) from TEST_DATA where fdate between to_date('21-APR-10', 'dd-MON-yy') and to_dat
e('21-APR-10 23:59:59', 'DD-MON-YY hh24:mi:ss');
COUNT(*)
283
Execution Plan
Plan hash value: 1687886199
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
| 0 | SELECT STATEMENT | | 1 | 9 | 3 (0)| 00:00:01 |
| 1 | SORT AGGREGATE | | 1 | 9 | | |
|* 2 | FILTER | | | | | |
|* 3 | INDEX RANGE SCAN| T_INDX | 283 | 2547 | 3 (0)| 00:00:01 |
Predicate Information (identified by operation id):
2 - filter(TO_DATE('21-APR-10','dd-MON-yy')<=TO_DATE('21-APR-10
23:59:59','DD-MON-YY hh24:mi:ss'))
3 - access("FDATE">=TO_DATE('21-APR-10','dd-MON-yy') AND
"FDATE"<=TO_DATE('21-APR-10 23:59:59','DD-MON-YY hh24:mi:ss'))
Note
- dynamic sampling used for this statement
Statistics
7 recursive calls
0 db block gets
76 consistent gets
0 physical reads
0 redo size
412 bytes sent via SQL*Net to client
380 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
1 rows processed

Hi,
user10541890 wrote:
Performance with dates in the where clause
CREATE TABLE TEST_DATA
FNUMBER NUMBER,
FSTRING VARCHAR2(4000 BYTE),
FDATE DATE
create index t_indx on test_data(fdata);Did you mean fdat<b>e</b> (ending in e)?
Be careful; post the code you're actually running.
query 1: select count(*) from TEST_DATA where trunc(fdate) = trunc(sysdate);
query 2: select count(*) from TEST_DATA where fdate between trunc(sysdate) and trunc(SYSDATE) + .99999;
query 3: select count(*) from TEST_DATA where fdate between to_date('21-APR-10', 'dd-MON-yy') and to_date('21-APR-10 23:59:59', 'DD-MON-YY hh24:mi:ss');
My questions:
1) Why isn't the index t_indx used in Execution plan 1?To use an index, the indexed column must stand alone as one of the operands. If you had a function-based index on TRUNC (fdate), then it might be used in Query 1, because the left operand of = is TRUNC (fdate).
2) From the execution plan, I see that query 2 & 3 is better than query 1. I do not see any difference between execution plan 2 & 3. Which one is better?That depends on what you mean by "better".
If "better" means faster, you've already shown that one is about as good as the other.
Queries 2 and 3 are doing different things. Assuming the table stays the same, Query 2 may give different results every day, but the results of Query 3 will never change.
For clarity, I prefer:
WHERE fdate >= TRUNC (SYSDATE)
AND fdate < TRUNC (SYSDATE) + 1(or replace SYSDATE with a TO_DATE expression, depending on the requirements).
3) I read somewhere - "Always check the Access Predicates and Filter Predicates of Explain Plan carefully to determine which columns are contributing to a Range Scan and which columns are merely filtering the returned rows. Be sceptical if the same clause is shown in both."
Is that true for Execution plan 2 & 3?
3) Could some one explain what the filter & access predicate mean here?Sorry, I can't.

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