redo buffer max size

would u plz tell me what is the maximum size of redo buffer?
my OS is windows 2000 advanced server SP4.
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Are you talking Oracle? Assuming Yes, then I don't think there is a limit specifically on the size of the redo buffer. However, sizing of this component contributes to the overall size of the SGA and there is a platform/os specific limit on the size of SGA. For for most 32 bit operating systems max SGA size is around 3.5 GB. For Windows2000 I have read that max SGA <3GB:

From a forum on metalink:
"Eventhough you are using Windows 2000 Advance Server, the size of the SGA must still fit into the 3GB address space of physical memory. This is the limitation of the OS and the fact that it is of 32-bit architecture."

Scott Pettman

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