15.5. Lowering the SGA Attach Address for Shared Memory Segments in Oracle 9i

# shutdown Oracle
SQL> shutdown

cd $ORACLE_HOME/rdbms/lib

# Make a backup of the ksms.s file if it exists
[[ ! -f ksms.s_orig ]] && cp ksms.s ksms.s_orig

# Modify the SGA attach address in the ksms.s file before relinking Oracle
genksms -s 0x15000000 > ksms.s

# Create a new ksms object file
make -f ins_rdbms.mk ksms.o

# Create a new "oracle" executable ($ORACLE_HOME/bin/oracle):
make -f ins_rdbms.mk ioracle

# The last step creates a new Oracle binary in $ORACLE_HOME/bin 
# that loads the SGA at the address specified by sgabeg in ksms.s:
#   .set   sgabeg,0X15000000

# Get pid of e.g. the Oracle checkpoint process
$ /sbin/pidof ora_dbw0_$ORACLE_SID
13519
$ grep '.so' /proc/13519/maps |head -1
10000000-10016000 r-xp 00000000 03:02 750738     /lib/ld-2.2.4.so
$ grep 'SYS' /proc/13519/maps |head -1
15000000-24000000 rw-s 00000000 00:04 262150     /SYSV3ecee0b0 (deleted)
$