The SPFILE initialization parameter contains the name of the current server
parameter file. When the default server parameter file is used by the server (that is,
you issue a STARTUP command and do not specify a PFILE), the value of SPFILE is
internally set by the server. The SQL*Plus command SHOW PARAMETERS SPFILE (or
any other method of querying the value of a parameter) displays the name of the
server parameter file that is currently in use.[@more@]
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