Option gray when dbca deletes a database

In this case, you have previously copied and restored all the files under u01apporacle. to delete an existing database, you can find deletedata in dbca.

In this case, you have previously copied and restored all files under/u01/app/oracle. When you want to delete an existing database, you can find the delete data

In this case, you have previously copied and restored all files under/u01/app/Oracle. to delete an existing database, it is found that the delete database option in dbca is gray. But there is actually a database, so I suspect that the configuration file does not match. After reading some information on the Internet, you can directly modify/etc/oratab. After the actual operation, you can:

The original content in/etc/oratab is as follows:

$ Cat/etc/oratab
#
# This file is used by ORACLE utilities. It is created by root. sh
# And updated by the Database Configuration Assistant when creating
# A database.
# A colon, ':', is used as the field terminator. A new line terminates
# The entry. Lines beginning with a pound sign, '#', are comments.
#
# Entries are of the form:
# $ ORACLE_SID: $ ORACLE_HOME: :
#
# The first and second fields are the system identifier and home
# Directory of the database respectively. The third filed indicates
# To the dbstart utility that the database shocould, "Y", or shocould not,
# "N", be brought up at system boot time.
#
# Multiple entries with the same $ ORACLE_SID are not allowed.
#
#
# *:/U01/app/oracle/product/9.2: N
# *:/U01/app/oracle/product/9.2: N
# *:/U01/app/oracle/product/9.2: N
# *:/U01/app/oracle/product/9.2: N
# *:/U01/app/oracle/product/9.2: N
# *:/U01/app/oracle/product/9.2: N
# *:/U01/app/oracle/product/9.2: N
*:/U01/app/oracle/product/9.2: N

You only need to change the * in front of the last line to the ORACLE_SID you want to delete.