ORA00844 解决Oracle数据库初始化参数错误（oracle 00844）
ORA-00844: Resolving Oracle Database Initialization Parameter Errors
Oracle databases are widely used by organizations around the world for managing their data. However, at times, users may encounter error messages while initializing the database. One such error is ORA-00844. This error is related to initialization parameters that are set incorrectly or are not compatible with the system. In this article, we will discuss how to resolve ORA-00844 errors in Oracle databases.
Understanding ORA-00844 Error
ORA-00844 is an initialization error that occurs when the database cannot recognize a specific initialization parameter or the parameter is set incorrectly. In most cases, this error occurs due to incorrect configuration settings or system limitations. The error message for ORA-00844 includes a description of the underlying issue and suggests possible solutions.
Resolving ORA-00844 Error
To resolve the ORA-00844 error, there are different steps you can follow based on the cause of the error.
1. Check Initialization Parameter Settings
The first step to resolving ORA-00844 is to check your initialization parameter settings. Make sure that all the parameters have been entered accurately and match the system requirements. You may also want to compare your settings with the Oracle documentation to ensure that you are following the best practices.
To check the parameter settings, you can use the following command:
SHOW PARAMETER parameter_name;
If the parameter is set incorrectly, you can modify it using the ALTER SYSTEM command:
ALTER SYSTEM SET parameter_name = ‘new_value’ SCOPE = SPFILE;
2. Increase Shared Pool Size
If the ORA-00844 error occurs due to the shared pool size limit, you can increase the size of the shared pool. The shared pool is responsible for caching SQL and PL/SQL codes during execution. The default size of the shared pool may not be enough to handle high volumes of SQL queries.
To increase the shared pool size, use the following command:
ALTER SYSTEM SET SHARED_POOL_SIZE = new_size;
3. Increase SGA Size
The System Global Area (SGA) is a shared memory area that is used to store database buffers, shared pools, and other important structures. If your database is experiencing ORA-00844 errors due to insufficient memory, you can increase the size of the SGA.
To increase the SGA size, use the following command:
ALTER SYSTEM SET SGA_TARGET = new_size;
4. Check System Resource Limits
If the ORA-00844 error persists, it may be due to system resource limits. You can check your system resource limits using the following command:
ulimit -a
The output will include the maximum allowed values for different resources such as CPU time, file size, and memory size. If any of these values are below the required limit, you can increase them using the following command:
ulimit -n new_limit
Conclusion
ORA-00844 is a common error that can occur in Oracle databases due to configuration issues or system limitations. The best way to resolve this error is to check your initialization parameter settings, increase shared pool or SGA size, or adjust your system resource limits. By following the steps outlined in this article, you can quickly resolve ORA-00844 errors and ensure that your Oracle database is running smoothly.
