What is the difference between ref cursor and Sys_refcursor in Oracle?

What is the difference between ref cursor and Sys_refcursor in Oracle?

There is no difference between using a type declared as REF CURSOR and using SYS_REFCURSOR , because SYS_REFCURSOR is defined in the STANDARD package as a REF CURSOR in the same way that we declared the type ref_cursor .

What is the use of ref cursor in Oracle?

A REF CURSOR is a PL/SQL data type whose value is the memory address of a query work area on the database. In essence, a REF CURSOR is a pointer or a handle to a result set on the database. REF CURSOR s are represented through the OracleRefCursor ODP.NET class.

What is the difference between explicit cursor and cursor FOR loop?

Unlike an implicit cursor, you can reference an explicit cursor or cursor variable by its name. Therefore, an explicit cursor or cursor variable is called a named cursor. The cursor FOR LOOP statement lets you run a SELECT statement and then immediately loop through the rows of the result set.

What is implicit cursor in Oracle?

An implicit cursor has attributes that return information about the most recently run SELECT or DML statement that is not associated with a named cursor. Note: You can use cursor attributes only in procedural statements, not in SQL statements.

What is the difference between cursor and collections?

A cursor is a compiled SQL program. A cursor variable (in PL/SQL for example) is a pointer/handle for this cursor program in server memory (Shared Pool in the SGA). A collection is a non-scalar/array data structure. Neither implements business logic.

Can you have two stored functions with the same name?

No, you can’t. That means only packaged function/procedures can be overloaded, and we can’t create two stored functions with the same name as seperate objects in the database.

Can we use commit in 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. Pragma AUTONOMOUS_TRANSACTION allow you to build the Independent (child) Transaction, started by another.

What is the difference between implicit and explicit?

Explicit describes something that is very clear and without vagueness or ambiguity. Implicit often functions as the opposite, referring to something that is understood, but not described clearly or directly, and often using implication or assumption.

Why do we use explicit cursor?

An explicit cursor is a named pointer to a private SQL area that stores information for processing a specific query or DML statement—typically, one that returns or affects multiple rows. You can use an explicit cursor to retrieve the rows of a result set one at a time.

What are the drawbacks of implicit cursors?

Drawbacks of Implicit Cursor

• Provide less programmatic control.
• More vulnerable to data errors.
• Less efficient than explicit cursor.