How to solve the problem that Oracle users cannot log in

Solution for oracle users who cannot log in: 1. Check whether the User Name is correct, and confirm the Oracle user name to log in against the database user table dba_users; 2. Check whether the Password is correct and confirm the user's login password; 3. Check whether the user's account is locked; 4. Check whether the user's permissions are correct and adjust the user's permissions; 5. Check whether the service status is normal, confirm whether the firewall has blocked the database port, check whether the Oracle login interaction code is garbled, etc. .

The operating environment of this tutorial: Windows 10 system, Oracle version 19c, Dell G3 computer.

Different from the login operation in the MySQL environment, the login operation in the Oracle environment involves more parameters. Once the meaning of these parameters is not understood, the Oracle user login will fail. In solving this type of web development When encountering problems, you need to carefully understand the Oracle user login process and the meaning of relevant parameters. If necessary, you can also go deep into the dba_users table to check the validity of the database user. The following is a brief introduction on how to solve Oracle user login problems:

1. Check whether the User Name is correct: first check the database user table dba_users to confirm whether the Oracle user name to be logged in is correct. If the user name is incorrect, you will not be able to log in;

2. Check whether the Password is correct: log in to Oracle When doing so, you need to check the user’s login password. If the password is incorrect, an ORA-01017: invalid username/password error will appear;

3. Check whether the user’s account is locked: If the Oracle user continues to If you enter the wrong password to log in, the system will automatically lock your account and give the error ORA-28000: the account is locked. You can unlock the account through SQL, such as: `ALTER USER username ACCOUNT UNLOCK;`

4, Check whether the user's permissions are correct: Sometimes the ORA-01031: insufficient privileges error occurs. This is usually caused by insufficient user permissions. The user's permissions should be adjusted, for example: `grant connect,resource,dba to username;`

5. Analyze other possible reasons: When all the above parameters are correct, login failure still occurs. Other possible reasons should be carefully analyzed. There may be a problem with the Oracle database service installation. You can check whether the service status is normal. , the firewall should also confirm whether the database port is blocked. If the Oracle login interaction code is garbled, it may also be due to encoding problems.

To sum up, to solve the Oracle user login problem, we must first carefully check the relevant parameters of the database, especially User Name and Password, to determine their correctness. Secondly, we must also consider whether the user permissions are correct, and the database service Possible encoding issues.

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