Reasons and solutions for automatic shutdown of Oracle database

Oracle database is an enterprise-level relational database. Its stability and reliability directly affect the security of enterprise data and business continuity. However, in the process of using the Oracle database, automatic shutdown sometimes occurs, which causes uneasiness and worry for database users. This article will analyze and give solutions from the following four aspects: 1. Cause analysis, 2. Log analysis, 3. Configuration check, 4. Solution.

1. Cause Analysis

The main reasons why the Oracle database automatically closes are as follows:

1. Insufficient memory and disk space: When operating the Oracle database, the memory and disk space are insufficient. The disk space may be filled up quickly, causing the system to crash or the Oracle database to automatically shut down.

2. Timeout processing: Oracle database can handle session timeout. When the database does not respond for a long time, the Oracle database will automatically shut down.

3. The service is stopped: The Oracle database service may be stopped, causing the database to automatically shut down.

4. Program error: An error may occur during the execution of the Oracle database program, forcing the program to close, causing the database to also close.

2. Log analysis

In order to find out the reason why the Oracle database automatically shuts down, you need to obtain some information from the log. Oracle database logs generally have the following two types:

1. Oracle database warning log

This log mainly records some abnormal information during the operation of the Oracle database, such as insufficient disk space, Oracle The memory occupied by the instance is too large, etc.

In the installation directory of the Oracle database, you can find log files containing the "alert" keyword, such as alert_orcl.log.

2.Oracle database tracking log

This log will record the running information of the Oracle database in detail, including the opening and closing of sessions, SQL execution, resource consumption and other information.

The default location of the tracking log file of the Oracle database is in the $ORACLE_HOME/admin//udump directory. Just analyze the log information in the file starting with "ora_".

By analyzing the exception log, finding clear exception information is the first step to solve this type of problem. For example, if the error code ORA-600 or ORA-7445 appears in the error message, it means that a fatal error has occurred in the Oracle database and urgent repair is required.

3. Configuration check

The reason for the automatic shutdown of the Oracle database may also be related to the configuration of the database. Therefore, performing a configuration check is also an important step in solving such problems. The following are configuration items that should be checked:

1. Database authorization and roles: First, you need to check whether the roles and user authorization in the database are normal. If the account authorization permissions are insufficient or confusing, the session will be suddenly disconnected, causing the Oracle database to automatically shut down.

2. Database parameter settings: The system parameter settings of the Oracle database may cause various abnormal situations in the database. System parameters are typically found in configuration files such as SPFILE (server port file) and init.ora files.

3. Network configuration: Oracle database requires data transmission through a network connection, so you need to check whether the network connection configuration is correct, for example, whether the listener configuration in the listener.ora file is correct.

4. Solution

Listed below are some methods to solve this problem:

1. Monitor the database: Repeatedly check the Oracle database through database performance monitoring tools , detect abnormal situations in time.

2. Increase memory and disk space: If memory and disk space are insufficient, increasing space can effectively solve some problems.

3. Modify the automatic shutdown waiting time: For the situation where the automatic shutdown waiting time is too short, it can be solved by modifying the automatic shutdown waiting time. Specifically, you can adjust the waiting time by modifying the SQLNET.INBOUND_CONNECT_TIMEOUT parameter value in the sqlnet.ora file. It is recommended to set it to more than 240 seconds.

4. Modify the automatic shutdown log level: For insufficient log records or too large log files, you can solve the problem by modifying the database log level.

The above are solutions to some common Oracle database automatic shutdown problems. In general, when encountering automatic shutdown problems, it is necessary to combine cause analysis, log analysis, configuration inspection and solutions to find an effective method to solve the problem.

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