Look at the operation of the elder brother;
User Atongmu connection, modify table space users offline, prompt permission is insufficient;
Oracle roughly says: Find a database administrator to do the operation, or let him give you the permissions you need;
SYS user connection, the change was successful;
Then open the table, the following prompts, unable to read the data file;
Use this command to modify the online;
ALTER tablespace XXXXXXX ONLINE;
The following experiment closes the open database;
Open a system table first to see;
connection from SQL Plus; the first time the wrong password was lost;
password expiration; reset password;
Close the database, insufficient permissions;
Connect with SYSDBA identity;
Then open the table in SQL Developer, and the following prompts appear;
Start a database; succeed;
Close the previous connection in SQL Developer, and then reopen it to operate;