Sizing DB_CACHE_SIZE and SHARED_POOL_SIZE

Hello, is the a good rule to use when sizing DB_CACHE_SIZE and SHARED_POOL_SIZE is terms of a percentage of the total memory you are allocating to Oracle?
For example I have used the following:
I take 70% of the total memory on the machine and allocate it to Oracle.
70% to DB_CACHE_SIZE
30% to SHARED_POOL_SIZE
I am looking for the best way to do this as a starting point. Thank you.
David

Hi,
Database concepts
Database Administrator guide
Oracle Reference
are some of the online books.
You may refer to
http://www.oracle.com/pls/db92/db92.docindex?remark=homepage
Also check the documentation for statspack and try installing statspack on your system and see the reports, to identify the bottelnecks and resolve the problems.
Performance tuning will be a continuous activity till you have a tuned stable system. As other member said, there are no golden rules for the pool sizes.
Regards,
Badri.

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    No camera manufacturer guarantees that any LP material will play correctly on any camcorder other than the one on which it was recorded (because of these narrow LP tracks). [Sony created the professional 'DVCAM' speed - one-and-a-half-times normal SP speed, so two-thirds the recording time - to provide -w-i-d-e-r- tracks than normal, and thus ensure that professional DV recordings can be played back and edited on equipment other than the camcorder which was used
    for shooting the material.]
    The only solution for LP tapes is to try importing from as many different camcorders as possible till you find one which will do the job. (I had to do exactly the same thing last week, and found that various other Sony 'consumer-grade' camcorders - the material was recorded on a Sony - couldn't 'lock onto' the LP track, but professional or 'prosumer' (more expensive) Canon (XLH1) and Sony (FX1) camcorders could play the old LP material.)
    Before trying to play old tapes, whether SP or LP, always wind them fast-forward all the way to the end, then rewind them - at least once - to make sure that the tape layers don't stick together, and to ease the stresses in the tape. You should also do this once a year to every recorded tape, to avoid stresses, pinching, and 'print-through' (seepage of magnetism from one layer of tape to others).
    P.S: Have you tried cleaning the 'broken' head on your old Canon? Dip a cotton bud in methylated spirits - or, better still, carbon tetrachloride 'dry cleaning' fluid - and slowly turn the head drum, and wipe up and down it, over and over again ..making sure NOT to catch cotton wool in the sharp narrow gap between each of the (two) heads, which are each halfway round the head (at 180 degrees to each other). Wipe carefully, then examine the cotton bud and see if there are any brown stains on it ..if so, you've cleaned old muck off the head. Repeat with a new cotton bud until there are no more stains on it. Leave the head drum to dry for 10 minutes, playing gentle (half) heat from a hair-dryer on it, but don't melt the plastic camcorder - so that the fluid evaporates and doesn't stick any tape to the head! - then try importing again.
    P.P.S: "..It seems that iMovie 6 will not allow me to play this video.." iMovie's tolerance for damaged digital video frames is far tighter than any camcorder's: a camcorder will often replace 'damaged' frames with detail from the undamaged frame before, so doesn't give a clear idea of how damaged the video data may be. If it won't import, it's damaged, possibly through head misalignment, or through a weak or dissipated signal. (Earlier versions, such as iMovie 2.1.2, were more tolerant of 'dodgy' video, and could import material which later versions, e.g; iMHD6, won't allow accept.)

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