The following is an example of a parameter file, in which the Oracle Database binary owner is oracle, the Oracle Database home (Oracle home) is in the path /u01/app/oracle/product/19.0.0/dbhome_1/, the Oracle base (where other Oracle software is installed) is /u01/app/oracle/, the central Oracle Inventory home (oraInventory) is /u01/app/oraInventory, the virtual IP address (VIP) is 192.0.2.1, the local node (the node where you run the deinstall command from) is myserver, and the OSDBA group is dba:

#Copyright (c) 2005, 2014 Oracle Corporation. All rights reserved.
#Mon Feb 17 06:48:39 UTC 2014
DISK_GROUPS.sidb=
ASM_HOME=
ASM_LOCAL_SID=
LOGDIR=/u01/app/oracle/product/19.0.0/dbhome_1/oraInventory/logs/
ORACLE_BASE.sidb=/u01/app/oracle/
RECOVERY_LOC.sidb=
STORAGE_TYPE.sidb=FS
ORACLE_BASE=/u01/app/oracle/
INVENTORY_LOCATION=/u01/app/oraInventory
DB_TYPE.sidb=SI_DB
NODE_LIST.sidb=myserver
ARCHIVE_LOG_DESTINATION_LOC.sidb=
LOCAL_SID.sidb=sidb
DB_UNIQUE_NAME_LIST=sidb
ASM_FILES.sidb=
HOME_TYPE=SIDB
CRS_HOME=false
RAW_MAPPING_FILE.sidb=
SID_LIST.sidb=sidb
ORACLE_BINARY_OK=true
DATAFILE_LOC.sidb=/u01/app/oracle/oradata
local=false
LOCAL_NODE=myserver
CREATION_MODE.sidb=y
CONFIGFILE_LOC.sidb=
DIAG_DEST.sidb=/u01/app/oracle/
silent=false
ORACLE_HOME=/u01/app/oracle/product/19.0.0/dbhome_1/
SPFILE_LOC.sidb=