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Autonomous versus Nested Transactions
Though an autonomous transaction is started by the other transaction, it is not a nested transaction for the reasons shown below:
(i) It does not share the transactional resources (like locks) with the major transaction.
(ii)It does not depend on the major transaction. For illustration, if the major transaction rolls back, nested transactions roll back, while the autonomous transactions do not.
(iii)Its committed changes are visible to other transactions instantly. Whereas the nested transaction's committed changes are not visible to other transactions till the major transaction commits.
Committing and Rolling Back The COMMIT and ROLLBACK end the active autonomous transaction but do not exit the autonomous routine. As the figure shows, if one transaction ends,
Scoping Within the similar scope, all the declared identifiers should be unique. So, even if their datatypes differ, the variables and parameters cannot share the similar name.
Forward Declarations The PL/SQL needs that you declare an identifier before using it. And hence, you should declare a subprogram before calling it. For illustration, the decla
Procedures The procedure is a subprogram which performs a specific action. You write procedures using the syntax as shown below: PROCEDURE name [(parameter[, parameter, .
What Is a Record ? A record is a group of related data items that stored in the fields, each with its own name and datatype. Assume that you have different data about an em
Entering and Exiting If you enter the executable part of an autonomous routine, the major transaction suspends. When you exit the routine, the major transaction resumes. To ex
On occasion, some of Brewbean's customers mistakenly leave an item out of a basket already checked out, so they create a new basket containing the missing items. However, they requ
Transaction Control The Oracle is transaction oriented; that is, Oracle uses the transactions to make sure the data integrity. The transaction is a sequence of SQL data manip
INSERT Statement The INSERT statement adds fresh rows of data to the specified database table or view. Syntax:
a. Create a table odetails_new. It has all the attributes of odetails and an additional column called cost, whose values are the product of the quantity and price of the part bein
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