Modify oracle parameters

Oracle parameters are key to managing Oracle database performance. Adjusting Oracle parameters to appropriate values ​​can improve database performance and reliability. Therefore, the installation and configuration of Oracle database includes adjusting Oracle parameters to optimize database performance.

The parameters of Oracle 11g and 12c are basically composed of hundreds of basic parameters, covering all aspects of database operations, such as memory, number of concurrent users, I/O, network connection, backup, debugging, etc. These parameters control the performance of the database, and the default values ​​can be modified to optimize the database.

However, modifying Oracle parameters is not an easy task. Improper adjustments may lead to database crashes, performance degradation, security issues, etc. Therefore, pay attention to the following points when adjusting Oracle parameters:

1. Back up the database

Be sure to back up the database before making any parameter changes. Because if you want to restore to the previous state, backup is the only way.

2. Check the current parameter settings

Before changing the parameters, it is recommended to understand the current parameter settings in order to understand the setting background and upper and lower limits of the parameter values. You can use the following command to view the current parameter settings:

SELECT name, value FROM V$Parameter;

3. Understand the parameters

Before modifying the parameters, you need to Modify parameters with adequate knowledge and understanding. It is best to read relevant documents, blogs, etc. to understand the meaning, function, upper and lower limits of parameters.

4. Do not over-adjust parameters

Excessive adjustment of parameters may lead to undesirable results. Therefore, it is very important to understand the default, current, and recommended values ​​of this parameter before adjusting it. When adjusting parameters, you need to adjust them step by step rather than changing multiple parameters at once.

5. Test the modification effect

After modifying the parameters, you need to test the modification effect. For this purpose, you can use various tools to test performance. For example, you can use SQL Tuning Advisor, AWR report, Trace and other tools to analyze the performance of the database and evaluate whether the changes made have improved it.

6. Record the modification process

When modifying parameters, it is necessary to record the modification process for subsequent reference. The reference record also includes when the database was backed up, when the parameters were modified, and a detailed description of the changes.

For Oracle system administrators, correctly adjusting Oracle parameters is an inevitable problem. Again, be very careful to adjust parameter values ​​to ensure stable database operation and good performance. Reasonable Oracle parameter settings can significantly improve the performance and reliability of the database, and contribute to improving the efficiency and profitability of enterprises.

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