Autonomous transactions are used in Oracle databases to break down complex transactions into simpler parts. They interrupt the original transaction to retrieve information or complete the process required by the standalone transaction, then resume processing the original transaction. They provide simplicity and flexibility in calling database operations and can be nested within each other. They also make it easier to review transactions for auditing purposes.
An autonomous transaction is a type of transaction used in the Oracle® line of database software programs. In the simplest sense of the word, a standalone transaction is a transaction that occurs and completes as part of another transaction. During standalone transactions, the computer software interrupts processing of the original transaction, taking a detour to retrieve information or complete the process required by the standalone transaction. Once it gets a result for the standalone transaction, it picks up exactly where it left off processing the original transaction.
Standalone transactions are typically used when a database operator wants to break up a more complex transaction into its component parts. For example, if the database operator wants to produce a list of all employees earning more than $60,000 US Dollars (USD) a year, and then wants to split that list for only employees under age 30, using a standalone transaction would allow the operator to split the request into two parts. First, the computer will collect a list of all employees earning $60,000 USD. In the middle of doing this, it will resolve the second part of the request to complete the self-transaction, selecting only those employees from the list of $60,000 USD or more who are also younger than 30 years old.
A major benefit of standalone transactions is that they provide greater simplicity when calling database operations. By breaking things down into their component parts, it can become easier for a database operator to visualize each step of the process, easing the process of coding the actual request. A second advantage of standalone transactions is that they can be nested within each other; a skilled database operator can schedule a transaction that calls an autonomous transaction where the autonomous transaction then calls any number of additional autonomous transactions. This dramatically improves the flexibility of Oracle database transaction software, allowing more complex transactions to be easily encrypted.
Every transaction that occurs in the program is tracked by the software itself for auditing purposes. This allows people to review the transactions that have been requested from the database. Writing standalone transactions can help streamline the review process, as it is much easier to make sense of a number of sequential simple transactions than a single complex statement.
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