HI wat's use of notes and patches in sap why its require..

Question

Hi can anyone give me idea about notes and patches why its required and wat's its effect in  technical side and in functional side also..
Thanks & Regards,
  Nainesh.

Answer 1

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In order to fix one of the problem in R/3 system, SAP will asked you to download an OSS notes which is a ".car" file. 
To work with a CAR File do the following at OS Level:
Get into OS as <sapsid>adm
Copy the .CAR file to a Temporary Directory.
Uncompress the file with SAPCAR
Copy the the data file generated in the  data transport directory 
( ej: = /usr/Sap/trans/data).
Copy the the cofile file generated in the  cofiles transport directory 
( = ej: /usr/Sap/trans/cofiles).
Run transaction STMS
Upload the support package with SPAM transaction and the support package will show "New support packages". 
Examples of CAR command :-
   1) UNIX only: 
       Log on as user <sapsid>adm. 
       cd /usr/sap/trans 
       CAR -xvf tmp/<ARCHIVE_NAME>.CAR -V 
   2) Windows NT only: 
       Log on as user <SAPSID>ADM. 
       cd \USR\SAP\TRANS 
       CAR -xvf TMP\<ARCHIVE_NAME>.CAR 
This Will create two(2) FILES
After you run SPAM  you MUST run STMS and check the transport queues 
As per 315963 note you can direct made the changes in the program or you can apply the support pack. 
a) If you want to apply correction then first you need to register the object in SAP, so that you will get the Access key and then you can make the changes.
b) If you want to import the support pack then you need to down load from SAP market-place. and this is in CAR file. and then you need extract the same using CAR utility. 
ex: CAR -xvf abc.car
or 
you can directly apply the patch from SAPGUI, login to 000 client and then you can load the patch from Presentation server. 
Also check what is your current basis patch level?
For example if you want to apply patch 07 and you are having 05 then you need to apply 06 and then apply 07.
Things to take note of:-
It would definitely be better to apply the latest spam/saint spam manager, tp, R3trans and possibly a new kernel patch. 
This is not a simple task to complete on the fly.  By applying SAP support packs, you may run into problems with SPDD and SPAU adjustments. Also include the fact that the support packages may break one of your transactions.  You may want to test this in your sandbox environment, if you have one, before tackling it.
In most situation when you apply support packages, it can takes about 3 weeks to fully test the support packages before you can apply them to the production system. 
Do test your "golden" transactions to make sure that they are not broken.  If you are not familiar with SPDD and/or SPAU adjustments than do not attempt to load support packages.
You may be better off just to modify the SAP object in question via OSS note.