ORA-12514 TNS Listener currently does not recognize the service requested in the connection descriptor

Pl/sql when Oracle is connected

ORA-12514 TNS Listener currently does not recognize the service requested in the connection descriptor

This error

As shown in the following illustration:

This problem is often encountered, often appear in the situation is: before or say that the early days are good, all of a sudden can not connect;

Summarize the reason:

First, the use of anti-virus software or other software to optimize the performance of the system when the service was turned off;

Second, frequent start-up and shutdown services, resulting in abnormal monitoring;

Solving method

Find the options in the service and start the appropriate service as shown in the following illustration:

Description: The Java in Oracleservicejava represents the database name, as shown in the following illustration:

Well, through the above operation can solve the problem, of course, this approach is not representative will be able to solve, but said it is possible to solve.