Executable SQL statement - Definition - Oracle Transaction

Q.  What is an executable SQL statement?
- Published on 27 Jul 15

a. A statement that can be executed without errors
b. Statement that generates calls to an instance, including DDL statements only.
c. Statement that generates calls to an instance including statements only.
d. Statement that generates calls to an instance, including DML and DDL statements.

ANSWER: Statement that generates calls to an instance, including DML and DDL statements.

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    Discussion

  • Nirja Shah   -Posted on 23 Sep 15
    - A transaction in Oracle begins when the first executable SQL statement is encountered.

    - An executable SQL statement is a SQL statement that generates calls to an instance, including DML and DDL statements.

    - When a transaction begins, Oracle assigns the transaction to an available undo tablespace to record the rollback entries for the new transaction.

    - A transaction ends when any of the following occurs:

    1. A user issues a COMMIT or ROLLBACK statement without a SAVEPOINT clause.

    2. A user runs a DDL statement such as CREATE, DROP, RENAME, or ALTER. If the current transaction contains any DML statements, Oracle first commits the transaction, and then runs and commits the DDL statement as a new, single statement transaction.

    3. A user disconnects from Oracle. The current transaction is committed.

    4. A user process terminates abnormally. The current transaction is rolled back.

    - After one transaction ends, the next executable SQL statement automatically starts the following transaction.

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