Add or Remove Database Options with chopt

chopt tool allows easier way of enabling or disabling certain database options after the database software installation. chopt does the binary relinking as part of enabling or disabling. Following shows an oracle database installation where real application testing is enabled (output generated using script here).

RAC             [    INSTALLED     ]
RAT             [    INSTALLED     ]
OLS             [  NOT INSTALLED   ]
DV              [  NOT INSTALLED   ]
ASM             [  NOT INSTALLED   ]
OLAP            [    INSTALLED     ]
PART            [    INSTALLED     ]
CTX             [    INSTALLED     ]

chopt is used to disable RAT. Shutdown the database first and then use chopt.

srvctl stop database -db en18c

chopt disable rat

Writing to /opt/app/oracle/product/18.x.0/dbhome_1/install/disable_rat_2019-04-09_15-36-37pm.log...
/usr/bin/make -f /opt/app/oracle/product/18.x.0/dbhome_1/rdbms/lib/ins_rdbms.mk rat_off ORACLE_HOME=/opt/app/oracle/product/18.x.0/dbhome_1
/usr/bin/make -f /opt/app/oracle/product/18.x.0/dbhome_1/rdbms/lib/ins_rdbms.mk ioracle ORACLE_HOME=/opt/app/oracle/product/18.x.0/dbhome_1

srvctl start database -db en18c

Checking the output for enabled components after the change shows RAT is not installed any more.

RAC             [    INSTALLED     ]
RAT             [  NOT INSTALLED   ]
OLS             [  NOT INSTALLED   ]
DV              [  NOT INSTALLED   ]
ASM             [  NOT INSTALLED   ]
OLAP            [    INSTALLED     ]
PART            [    INSTALLED     ]
CTX             [    INSTALLED     ]

Currently chopt could be used to enable or disable Oracle Advanced Analytics, Oracle OLAP, Oracle Partitioning and Oracle Real Application Testing options in 12.1 and above. For 11.2 the list include Oracle Data Mining RDBMS Files, Oracle Database Vault option, Oracle Label Security, Oracle OLAP, Oracle Partitioning and Oracle Real Application Testing.

Check which Binary Options are Installed

Oracle binary get linked with many of the database options.
RAC - Real Application Cluster
RAT - Real Application Testing
OLS - Oracle Label Security
DV - Database Vault
ASM - Automated Storage Management
OLAP - Oracle OLAP
PART - Oracle Partitioning
CTX - Context Management Text

Following script could be used to find out which options are already relinked with Oracle binary. (It is assumed ORACLE_HOME is set)

component=(RAC RAT OLS DV ASM OLAP PART CTX)
compfile=(kcsm.o  kecwr.o kzlilbac.o  kzvidv.o kfon.o xsyeolap.o kkpoban.o kciwcx.o)
i=0
for comp in ${component[@]}
  do
    x=`ar -t $ORACLE_HOME/rdbms/lib/libknlopt.a | grep -c ${compfile[i]}`
    if [[ "$x" == "0" ]]; then
      printf "%-15s %s \033[31m %8s \033[0m %2s\n" "$comp" "[" "NOT INSTALLED" "]"
    else
      printf "%-15s %s \033[32m %11s \033[0m %4s\n" "$comp" "["   "INSTALLED"   "]"
    fi
    let "i++"
  done

RAC             [  NOT INSTALLED   ]
RAT             [    INSTALLED     ]
OLS             [  NOT INSTALLED   ]
DV              [  NOT INSTALLED   ]
ASM             [  NOT INSTALLED   ]
OLAP            [    INSTALLED     ]
PART            [    INSTALLED     ]
CTX             [    INSTALLED     ]

More on metalink note
How to Check and Enable/Disable Oracle Binary Options [ID 948061.1]
How to Check Whether Oracle Binary/Instance is RAC Enabled and Relink Oracle Binary in RAC [ID 284785.1]