Remove Oracle database instance under Linux

1. Stop Service

First lsnrctl stop with command

And then run

Sqlplus/nolog

Sql> Conn/as SYSDBA

sql> shutdown

2, view the instance process and delete

Find $ORACLE _base/-name $ORACLE _sid

/mnt/installer/oracle/flash_recovery_area/orcl
/mnt/installer/oracle/oradata/orcl
/mnt/installer/oracle/diag/rdbms/orcl
/mnt/installer/oracle/diag/rdbms/orcl/orcl
/mnt/installer/oracle/admin/orcl
/mnt/installer/oracle/cfgtoollogs/dbca/orcl

[Oracle@rt1d20/]$ rm-rf/mnt/installer/oracle/flash_recovery_area/orcl/
[Oracle@rt1d20/]$ rm-rf/mnt/installer/oracle/oradata/orcl/
[Oracle@rt1d20/]$ rm-rf/mnt/installer/oracle/diag/rdbms/orcl/
[Oracle@rt1d20/]$ rm-rf/mnt/installer/oracle/admin/orcl/
[Oracle@rt1d20/]$ rm-rf/mnt/installer/oracle/cfgtoollogs/dbca/orcl/

Find $ORACLE _base/*-name ' *[bb][tt][ss][dd][bb]2* ' | Grep-v admin| Grep-v Oradata

Skip if not

$ CD mnt/installer/oracle/

$ ll

Drwxr-x---2 oracle oinstall 4096 8 16:50 Admin
Drwxr-xr-x 4 Oracle Oinstall 4096 7 23:12 cfgtoollogs
Drwxr-xr-x 2 Oracle Oinstall 4096 7 23:15 checkpoints
Drwxrwxr-x 4 Oracle Oinstall 4096 7 23:12 diag
Drwxr-x---3 oracle oinstall 4096 8 16:49 Flash_recovery_area
Drwxr-x---2 oracle oinstall 4096 8 16:49 Oradata
DRWXRWX---5 oracle oinstall 4096 7 21:06 orainventory
Drwxr-xr-x 3 Oracle Oinstall 4096 7 21:03 product

[Oracle@rt1d20 oracle]$ RM-RF admin/
[Oracle@rt1d20 oracle]$ RM-RF flash_recovery_area/
[Oracle@rt1d20 oracle]$ RM-RF oradata/

3, delete the old instance configuration items

VI Etc/oratab

Delete last line: Orcl:/mnt/installer/oracle/product/11.2.0/db_1:n

Finally silently reinstall the database instance