oracle automatically shuts down

Oracle automatically shuts down is a relatively common problem. In the Oracle database, automatic shutdown means that the database will automatically shut down and stop running under the following circumstances:

1. A fatal error occurs, such as data file damage or control file damage, etc.;
2. The database instance has been running for too long and has reached the set maximum running time;
3. Insufficient system resources, such as insufficient memory or disk space;
4. A system error occurred during operation Unexpected failure.

Automatic shutdown problems will cause unnecessary trouble to database operation. This article will focus on how to solve the Oracle automatic shutdown problem.

1. Troubleshooting

In the case of automatic shutdown, the first step is to find out what is causing the problem. Before troubleshooting, we need to check the database logs to understand what problem caused Oracle to shut down automatically. In Oracle, log information is recorded in alert.log. Use the following command to find the path to this file:

SQL> show parameters diag

After finding the log path, use the following command to view the log information:

SQL> cd / path/to/alert/log/directory
SQL> tail -f alert_SID.log

This allows you to view the latest information in the log file in real time. By looking at the log file, we can learn which errors caused Oracle to shut down automatically.

2. Increase memory

If your server has insufficient memory, the Oracle database may automatically shut down. The solution to this problem is to increase the system memory. Under Linux systems, you can use the following command to check memory usage:

$ free -h

This command will display the system's memory usage, including used memory, available memory, and cache. If there is insufficient memory, you can use the following command to release the cache:

$ sync; echo 3 > /proc/sys/vm/drop_caches

In addition, you can also close some unnecessary processes or service to free memory. If you cannot increase memory, consider deleting some unnecessary data from the database to free up some memory space.

3. Increase disk space

In Oracle database, disk space problems may also cause the database to automatically shut down. If you are running out of disk space, you can solve the problem by deleting some unnecessary files or moving your data files to a disk with more free space.

4. Modify parameters

If your Oracle instance runs for too long, the Oracle database may automatically shut down. This occurs due to the Oracle instance reaching the set maximum runtime limit. If you need to run a long task, you need to adjust the MaxIdleTime parameter. Use the following command to query the current MaxIdleTime parameter:

SQL> select * from v$parameter where name = 'idle_time';

If the parameter value is too small, it will appear during a long run Automatically close questions. You can use the following command to set the MaxIdleTime parameter:

SQL> alter system set idle_time=600 scope=both;

The above command sets the maximum idle time to 600 seconds. This parameter can be adjusted appropriately according to the actual situation.

5. Back up the database

Database backup is also very important to prevent automatic shutdown problems. Before an automatic shutdown occurs, it is recommended that you back up your database regularly. If you don't back up your database, you run the risk of losing data if something goes wrong with your database.

Summary

Oracle automatic shutdown problem is a very common problem, but this problem is very important for the stability and reliability of the database. Through the above measures, you can prevent automatic shutdown problems from occurring. If you find that the database is still closing automatically, please handle it in time to avoid affecting work efficiency while ensuring data integrity.

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