The service started by oracle cannot be started

When using the Oracle database, sometimes we encounter a situation where the service cannot be started. At this time, we need to troubleshoot and solve the problem. This article will introduce several reasons that may cause the Oracle startup service to fail to start, as well as the corresponding processing methods.

1. Service dependencies are stopped or not started

In Windows systems, Oracle's services depend on other services, such as Windows services, network services, etc. If these dependencies are not started, Oracle's services will also fail to start. At this point, we can confirm the dependencies of the service through the following steps:

1) Open the "services.msc" application

2) Find your Oracle service and right-click it, Select "Properties"

3) In the "Dependencies" tab, check whether the service dependencies are started and start them.

2. Oracle listener is not started

The Oracle listener is a key component of the Oracle database. It is responsible for responding to client requests and routing them to the correct database. Example. If the Oracle listener is not started, the Oracle service cannot be started. At this point, we can start the listener through the following command:

$ lsnrctl start

3. Oracle database instance is not started

The Oracle service is actually involved to two components: the listener and the database instance. An Oracle database instance is a specific database implementation, which contains data structures such as tables, indexes, and stored procedures. If the database instance is not started, the Oracle service cannot be started. You can start the Oracle database instance through the following command:

$ sqlplus / as sysdba
SQL> startup

4. The Oracle database instance is damaged

If there is a problem with the Oracle database instance, such as damaged data files or stored procedures, the Oracle service may not start. At this time, we can check the status of the database through the following methods:

$ sqlplus / as sysdba
SQL> select status from v$instance;

If the return result is "MOUNTED" or "OPEN", indicating that the database instance has been started. Otherwise, it needs to be repaired according to the corresponding error message.

5. Insufficient disk space for the Oracle database to run

If there is insufficient disk space for the Oracle database to run, the Oracle service cannot be started. At this time, we can check the file system usage through the following command:

$ df -h

If the "Used" column in the returned result shows close to 100%, it means that the disk space has been used up. exhausted. Disk space needs to be released by cleaning log files, shrinking the database, etc.

After troubleshooting and solving the above problems that may cause the Oracle startup service to fail to start, if the Oracle service still cannot start, then we can also locate the problem through the following methods:

1) Check Oracle Database log file to see if there is an error message

2) Check the Oracle database configuration file, such as tnsnames.ora, etc.

3) Check the network connection to ensure that the client can connect to the database instance

4) Check the Oracle database configuration, such as changing the database instance name, etc.

Summary

When using the Oracle database, the failure to start the Oracle startup service is not completely avoided. , but we can avoid the impact of these issues by troubleshooting them and fixing them. By understanding the above factors, identifying and solving problems, we can maintain the high availability and stability of the Oracle database.

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