How to change value in v$parameter table

hi ,
i am installing metadata repository for oracle application server,
i have to change the value of query_rewrite_enabled to TRUE,
but i am not able to change its value in v$parameter table because it is a fixed table/view.
pls help

One does not 'update' any V$, DBA_, USER_ or ALL_ views. Nastiness occurs to the health of the database when you update individual SYS tables without ensuring the integrity of the remainder of the system dictionary, so you should always update those tables using the system DDL commands (CREATE, ALTER, DROP, GRANT, REVOKE). These commands simply do the appropriate insert/update/delete to all the related tables owned by SYS.
If you are running with an SPFILE parameter file, as the DB superuser (SYS) you would alter the database system configuration using
ALTER SYSTEM SET QUERY_REWRITE_ENABLED=TRUE SCOPE=BOTH;
If you are using an older style PFILE (INITsid.ORA) you shut down the database, create or update a line in the PFILE with
*.QUERY_REWRITE_ENABLED=TRUE
and it will b e enabled on restart
(Which are you using? One way to find out is to go to the $ORACLE_HOME/dbs directory and look at the time stamp of the init?.ora and spfile?.ora files.)
By the way, such parameters and the permitted ways of changing them are discussed in the database Reference manual, which for 10g database is http://download-east.oracle.com/docs/cd/B19306_01/server.102/b14237/toc.htm

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How to change value in v$parameter table

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