Question: I don't understand the
scope=memory option. Does scope=memory only apply to SGA
parameters? How is scope=memory different than a standard
alter system command?
Answer: scope is a parameter used
in conjunction with the alter system command when you are
changing any initialization parameter of an spfile. It is vital
to understand how to use this parameter to achieve the desired
effect. There are three values that the scope
parameter can take:
For the value in question, scope = memory, Oracle will
make the change specified by the alter system command for
the life of the instance. The next time the database is
bounced, for any reason, the change will be reverted to the default
value.
For scope=spfile the change made in the alter system
command will take place starting from the next startup but will not
affect the current instance.
If you want the alter system
command to take place immediately you can use the scope = both
value, which will make the change for the current instance and
preserve it through any future bounces.
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