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What is SERIALLY reusable pragma in Oracle?
Each time the package is reused, its public variables are initialized to their default values or to NULL . Serially reusable packages cannot be accessed from database triggers or other PL/SQL subprograms that are called from SQL statements. If you try, Oracle generates an error.
What is pragma SERIALLY_ reusable and why is it used in Oracle?
The pragma SERIALLY_REUSABLE indicates that the package state is needed only for the duration of one call to the server (for example, a PL/SQL anonymous block, an OCI call to the database or a stored procedure call through a database link).
Which of the following Pragma you will use for packages that declare large temporary work areas which are used once and not needed during subsequent database calls in the same session?
This Pragma is appropriate for packages that declare large temporary work areas that are used once in the same session. The SERIALLY_REUSABLE Pragma can appear in the declare_section of the specification of a bodiless package, or in both the specification and body of a package, but not in only the body of a package.
What is Pragma in Oracle PL SQL?
The PRAGMA keyword is used to signify that the remainder of the PL/SQL statement is a pragma, or directive, to the compiler. Tells the PL/SQL runtime engine to commit or roll back any changes made to the database inside the current block without affecting the main or outer transaction.
What is the use of pragma Autonomous_transaction in Oracle?
AUTONOMOUS_TRANSACTION Pragma. The AUTONOMOUS_TRANSACTION pragma changes the way a subprogram works within a transaction. A subprogram marked with this pragma can do SQL operations and commit or roll back those operations, without committing or rolling back the data in the main transaction.
What is package in PL SQL with an examples?
A package is a schema object that groups logically related PL/SQL types, variables, constants, subprograms, cursors, and exceptions. A package is compiled and stored in the database, where many applications can share its contents.
Which is better procedure or package in Oracle?
Constants, sub-types and other useful things: there’s more to PL/SQL than stored procedures. Anything we can define in a package spec can be shared with other programs, for instance user-defined exceptions. Overloading: the ability to define a procedure or function with the same name but different signatures.
Can we use commit in trigger Oracle?
Can we have COMMIT inside Trigger? Yes, you can commit inside the trigger. But for this you have to make this trigger transaction to be an Independent transaction from its parent transaction, you can do this by using Pragma.
What are pragma exception types?
PRAGMA EXCEPTION_INIT: This PRAGMA associates an exception name with an oracle error number. It let you refer to any internal exception by name and to write a specific handler for it instead of using the OTHERS handler.
What is the use of pragma Exception_init ()?
You can intercept any ORA- error and write a specific handler for it instead of using the OTHERS handler. For more information, see “Associating a PL/SQL Exception with a Number: Pragma EXCEPTION_INIT”. Any valid Oracle error number. These are the same error numbers (always negative) returned by the function SQLCODE .
What does the pragma serially reusable mean in SQL?
SERIALLY_REUSABLE Pragma. The pragma SERIALLY_REUSABLE indicates that the package state is needed only for the duration of one call to the server (for example, a PL/SQL anonymous block, an OCI call to the database or a stored procedure call through a database link). After this call, the storage for the package variables can be reused,…
Can a serially reusable package be accessed from a database?
Each time the package is reused, its public variables are initialized to their default values or to NULL. Serially reusable packages cannot be accessed from database triggers or other PL/SQL subprograms that are called from SQL statements. If you try, Oracle generates an error.
How is global memory allocated for serially reusable packages?
The global memory for serially reusable packages is pooled in the System Global Area (SGA), not allocated to individual users in the User Global Area (UGA). That way, the package work area can be reused.
When to use a pragma in a program?
Pragmas are processed at compile time, not at run time. They do not affect the meaning of a program; they simply convey information to the compiler. This pragma is appropriate for packages that declare large temporary work areas that are used once and not needed during subsequent database calls in the same session.