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Don Burleson Blog 







Using scope in Oracle parameter changes

Oracle Database Tips by Donald BurlesonMay 20, 2015

Question:  How do I use the scope parameter argument in Oracle?

Answer:  Specifying SCOPE in parameters is easy.

Once you have an spfile, you can change any initialization parameter with the "alter system" command. However, there is an important SCOPE parameter that you need to understand.

The SCOPE parameter has three values MEMORY, SPFILE and BOTH. Let's look at an example of each:

Alter system set db_2k_cache_size=100m SCOPE=SPFILE;

If you want to make a change to a parameter in the spfile without affecting the current instance, you can do so using the SCOPE=SPFILE option of the ALTER SYSTEM statement. This is useful when you want to make a change starting from the next startup and not for the current instance.

Alter system set db_2k_cache_size=100m SCOPE=MEMORY;

In Oracle9i the database may be using an spfile. An spfile is a file that Oracle can both read from and write to during operation, allowing dynamic reconfiguration of many parameters, which is persistent across shutdowns and startups. A normal pfile can be generated using the command:

CREATE PFILE[=<location>] FROM SPFILE[=<location>];

If the files are in the default location ($ORACLE_HOME/dbs) then the optional ='location' full path specifications for the file locations aren't required. The inversion of the command is also allowed to generate an spfile from a normal pfile:

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