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Select isspecified,count(*) from v$spparameter group by isspecified;
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show parameter spfile

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Create pfile='d:pfileSID.ora' from spfile;
Create pfile='d:pfileSID.ora' from spfile='spfile_location';

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Create spfile from pfile='Your_pfile_location'
Create spfile='spfile_location' from pfile='Your_pfile_location'

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alter system set parameter=Value scope=spfile|both|memory

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SQL>startup pfile='Your_Pfile.ora'
startup spfile='/data/oracle/product/10.2.0/db_1/dbs/dbs/spfile_mqq.ora' force

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