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How do i check my oracle database is either 32 bit or 64bit

Have a lot of method…Here one method below

[oracle@netbackuptest bin]$ sqlplus / as sysdba

SQL*Plus: Release Production on Sat Nov 26 07:57:52 2011

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Connected to:
Oracle Database 11g Enterprise Edition Release - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options

SQL> select length(addr)*4 || '-bits' word_length from v$process where rownum=1;