Difference between revisions of "Transaction Control Statement"
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* An implicit COMMIT occurs when you exit client tools, such as SQL Developer. It also occurs if a DDL command, such as CREATE or ALTER TABLE, is issued. In other words, if a user adds several records to a table and then creates a new table, the records added before the DDL command is issued are committed automatically (implicitly). | * An implicit COMMIT occurs when you exit client tools, such as SQL Developer. It also occurs if a DDL command, such as CREATE or ALTER TABLE, is issued. In other words, if a user adds several records to a table and then creates a new table, the records added before the DDL command is issued are committed automatically (implicitly). | ||
* By contrast, commands such as CREATE TABLE, TRUNCATE TABLE, and ALTER TABLE can’t be rolled back because they are DDL commands, and a commit occurs automatically when they’re executed | * By contrast, commands such as CREATE TABLE, TRUNCATE TABLE, and ALTER TABLE can’t be rolled back because they are DDL commands, and a commit occurs automatically when they’re executed | ||
==SavePoint Command === | |||
'''developers sometimes use the SAVEPOINT command to create a type of bookmark in a transaction. This command is commonly used in the banking | |||
industry''' | |||
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Latest revision as of 23:04, 23 October 2017
Commit Command
A COMMIT command issued implicitly or explicitly permanently saves the DML statements issued previously
- An explicit COMMIT occurs when you enter a COMMIT statement
- An implicit COMMIT occurs when you exit client tools, such as SQL Developer. It also occurs if a DDL command, such as CREATE or ALTER TABLE, is issued. In other words, if a user adds several records to a table and then creates a new table, the records added before the DDL command is issued are committed automatically (implicitly).
- By contrast, commands such as CREATE TABLE, TRUNCATE TABLE, and ALTER TABLE can’t be rolled back because they are DDL commands, and a commit occurs automatically when they’re executed
SavePoint Command =
developers sometimes use the SAVEPOINT command to create a type of bookmark in a transaction. This command is commonly used in the banking industry