Oracle Abort：Dealing with Transaction Shutdown（oracleabort）

Oracle abort is a feature of the Oracle database that enables the system to automatically terminate a transaction in response to either a user action or an external event. This feature can be used to ensure data integrity and to protect data from corruption in the event of an unexpected system failure.

When a transaction is aborting, the following processes occur: all uncommitted data is discarded; all uncommitted locks, sessions and cursors are closed; and all changes made to the Oracle instance are rolled back to a previous state. In addition, all pending transactions will be terminated and any subsequent transactions will be blocked until the abort process is complete.

The abort process is initiated when an event or user action causes an aborted transaction. Some examples of this include a user pressing the abort button, an Oracle instance error, a transaction timeout due to a prolonged absence in the session or a system shutdown. Once the abort process is initiated, a notification is sent to the user. The user can then connect to the database and issue a rollback command to discard any uncommitted changes and return the Oracle instance to its previous state.

One way in which the Oracle abort can be manually triggered is through the use of the ‘alter system abort’ command. This command can be used to terminate the current transaction or a specific session or thread. This is useful in scenarios such as when an application is stuck in an endless loop and needs to be stopped or when the transaction does not need to be committed.

In order to ensure that the abort process is successful, it is important to ensure that all uncommitted changes are discarded and all locks, sessions and cursors are closed. This can be done by issuing the rollback command after the Oracle abort command is issued. Additionally, if the user is attempting to abort a particular transaction they need to be aware of any triggers or stored procedures that may have been invoked. It is important to try and remove any active transactions that may have been open to ensure that the Oracle instance is completely shut down.

In addition, the user should be aware of any other applications, users or programs that are connected to the Oracle instance. It is important to ensure that these applications are shutdown prior to the abort process being initiated. This prevents any other pending transactions from occurring, which can result in data inconsistencies or issues.

All in all, the Oracle Abort feature is an effective way of ensuring that the system, user and data integrity are maintained during an unexpected event. With proper planning and consideration users can easily ensure that the abort process is successful and does not cause any issues or data inconsistencies.