Here's the thing: (I take ORACLE9i as an example)
1): If your ORACLE server is installed on another computer (server) and the client is installed on your own computer; Then after installing PL/SQL Developer on the computer, the PL/SQL Developer login box will pop up every time you log in, asking you to enter:
User name: _ _ _ _ _ _//User name used to log in to the server-side database.
Password: _ _ _ _ _ _//Password for logging into the server-side database.
Database: _ _ _ _ _//The name of the server-side database.
The connection is: normal.
At least when I use it in the company. I wonder if you have installed both the server and the client on your computer. If so, it may be because you have logged in, and the system (your computer) automatically puts your user name and password in Cookies, so you don't need to enter your user name and password every time you log in. Otherwise, log in without entering your username and password, and log in to PL/SQL Developer. PL/SQL Developer will be displayed in the title bar, so you can't use the data in the database, understand? Friend!
2) I recommend some books by Oracle Bone Inscriptions to you: (9i and 10G).
1: Oracle9i Chinese Basic Training Course
Download address:
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2.2: introduction and practice of Oracle10g
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3. Proficient in oracle 10g system management.
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4. In addition, there is a good video tutorial called "Oracle 10G Database System Video Tutorial".
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-I downloaded all the above by myself, and there are many things that you can download in Baidu or Xunlei (all in PDF format), and you should be able to download them now.
I wish you success in your work and career progress! !