What to do if the oracle log is full

Oracle log full solution

When Oracle's log files are full, it may cause performance degradation or even crashes in the database. To solve this problem, there are the following solutions:

1. Clean old log files

Oracle will retain a certain number of log files by default for redo recovery. Expired or no longer needed log files can be deleted to free up space. Use the following command to clean the log file:

 <code class="sql">ALTER SYSTEM ARCHIVE LOG ALL;</code>

2. Increase the log file size**

If you do not need to clean old log files, you can increase the size of the log file. Use the following command to increase the size of the log file:

 <code class="sql">ALTER DATABASE <database_name> MODIFY LOGFILE GROUP <log_file_group_name> (SIZE <new_size>);</new_size></log_file_group_name></database_name></code>

3. Add log file group**

If increasing the log file size still does not solve the problem, you can increase the log file group. Use the following command to add a log file group:

 <code class="sql">ALTER DATABASE <database_name> ADD LOGFILE GROUP <log_file_group_name> (SIZE <new_size>);</new_size></log_file_group_name></database_name></code>

4. Set up automatic log management (ALM)**

ALM is a mechanism for automatically managing log files, which eliminates the need to manually manage log files. Set up ALM with the following command:

 <code class="sql">ALTER DATABASE <database_name> ENABLE LOGFILE AUTO_SIZE;</database_name></code>

5. Reinitialize the database**

If none of the above solutions solve the problem, you can consider reinitializing the database. Reinitializing the database will delete all log files and create new log files from scratch. Reinitialize the database using the following command:

 <code class="sql">ALTER SYSTEM INITIALIZE;</code>

Before implementing any solution, it is recommended to back up the database to avoid data loss.

The above is the detailed content of What to do if the oracle log is full. For more information, please follow other related articles on the PHP Chinese website!