commit and rollback on triggers

Tags:
Oracle 10g
Oracle 10g triggers
why we cannote use commit and rollback in triggers?

Software/Hardware used:
oracle 10g standard edition

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Short answer: It is a restriction imposed by Oracle.

Not so short: If transaction control commands (commit/rollback) were allowed in database triggers, then other programs or stored procedures/functions would not have control over their own transactions. They would not have a way to decide when to commit or rollback their operations.

For example, if a program performs an insert into a database table (which has an after insert trigger with a commit, it that were allowed), and then the program realizes that other required operations cannot be completed, and thus the whole transaction has to be rolled back. What would happen ? The insert has already been committed, so it cannot be rolled back, and thus, the transaction atomicity has been lost.

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