oracle database error
In the process of using the Oracle database, we often encounter various error reports, some of which will directly cause the database to become unusable and affect the normal progress of the business. This article will focus on Oracle database error reporting, discuss the causes of error reporting and common solutions, to help readers better understand and solve Oracle database error reporting problems.
1. Reasons for Oracle database errors
When using Oracle database, various error situations may occur due to various reasons, such as errors during installation and execution of SQL statements. Error, or there is an error in the database itself, etc.
- Installation errors
When installing the Oracle database, errors often occur. For example, in the Windows operating system, errors such as "Oracle Universal Installer failed to execute. java.lang.NullPointerException" may occur. Such errors are usually caused by problems with the installation package or related software environment. You need to re-download or install the correct installation package, and check whether the operating system is configured correctly.
- Errors occur when executing SQL statements
In Oracle database, various problems may occur when executing SQL statements, such as undefined tables or fields, incorrect Syntax, insufficient permissions, etc. These common errors can be solved by checking the correctness of the SQL statement, whether the user permissions are sufficient, and whether it is executed in the correct database.
- Errors occur in the database itself
Oracle database itself may also experience various errors, such as data file corruption, table space overflow, instance deadlock, etc. These errors may render the database unusable and cause business interruption. Usually it needs to be solved by data recovery, reducing table space, increasing system memory or restarting the database.
2. Common Oracle database errors and solutions
- ORA-12154: TNS: Could not resolve the connect identifier specified
When connecting to the Oracle database "ORA-12154: TNS: cannot resolve the specified connection identifier" error may occur. This may be caused by incorrect configuration information of the Oracle client or network connection problems. The solution can be to modify the configuration file of the Oracle client, increase the network connection timeout setting, and check the availability of the network connection.
- ORA-12514: TNS:listener does not currently know of requested in connect descriptor
When connecting to the Oracle database, "ORA-12514: TNS: The listener is temporarily unable to know the requested connection descriptor" error. This error is usually caused by the listener being unable to find the requested database instance, causing the connection to fail. Resolution can be accomplished by checking the database instance name, listener configuration, database status, and network connectivity.
- ORA-01033: ORACLE initialization or shutdown in progress
When starting or shutting down the Oracle database, "ORA-01033: ORACLE initialization or shutdown in progress" may appear "medium" error. This error is usually caused by an error or stall during database startup or shutdown. The solution can be solved by checking the status of the database instance, killing the occupying process, changing the startup type of the Oracle service, etc.
- ORA-01114: IO error writing block to file
When using Oracle database, "ORA-01114: IO error writing block to file may occur "mistake. This error is usually caused by corrupted data files or problems with the storage device. Solutions can be achieved by using Oracle's recovery commands to restore data, replacing storage devices, etc.
- ORA-01536: space quota exceeded for tablespace
When using Oracle database, the error "ORA-01536: tablespace exceeds space quota" may occur. This error is usually caused by the table space reaching its maximum capacity and being unable to continue storing data. The solution can be by increasing the size of the table space, deleting unnecessary data, enhancing the data compression effect, etc.
3. Conclusion
As an enterprise-level database application, Oracle database’s performance and stability are crucial to various enterprise application platforms. However, in the process of using the Oracle database, various errors may occur due to various reasons. These errors will not only affect the normal operation of the business, but may also cause the database data to be lost or damaged. Therefore, in order to better deal with Oracle database error problems, we need to carefully understand the characteristics of Oracle database, master the solutions to common errors, and timely maintain and update Oracle database-related software and configurations.
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