Hi sachin,
Sorry for the delay .
>>Can i upgrade 32 bit to 64 bit.
If you have the hardware which support 64 bit system then you can re-install 64 bit OS however you can not do in-place upgrade it to 64 BIt :
"You can use an upgrade disk, but you can't do an in place upgrade from a 32 bit system into a 64 bit system, the only way is to do a custom clean install"
http://answers.microsoft.com/en-us/windows/forum/windows_7-windows_install/upgrade-windows-7-32-bit-to-windows-7-64-bit/f6fe8d03-d280-4fa9-818f-a433db98a35b
>>what is the max RAM for the 64 Bit.
https://msdn.microsoft.com/en-us/library/windows/desktop/aa366778%28v=vs.85%29.aspx?f=255&MSPPError=-2147217396
>>Sql Server 2008 Database. Fast 15 Days onwards, its slow.It is a performance issue related to SQL please post the issue into following forum:
https://social.technet.microsoft.com/Forums/windowsserver/en-US/home?forum=sqlanalysisservices&filter=alltypes&sort=lastpostdesc
Best Regards,
Elton Ji
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