Re: could not read block 77 of relation 1663/16385/388818775

Alexandra Nitzschke wrote:
> BTW... how about a block checksum that is checked just before writing 
> a block and just after reading it? I know this would degrade 
> performance, but I think we can afford that. Would it be possible to 
> incorporate such code without having to do too much patching?


oracle has had an option for some time that uses read/only page 
protection for each page of the shared buffer area...   when oracle 
knows it wants to modify a page, it un-protects it via a system 
call.     this catches any wild writes into the shared buffer area as a 
memory protection fault.