What is weak ref cursor in Oracle?

When a Ref-Cursor is defined without a return type, it is called as a weakly typed dynamic Ref-Cursor. The SYS_REFCURSOR cursor variable is an Oracle-defined weak Ref-Cursor type, which is pre-declared in the STANDARD package.

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

A cursor is really any SQL statement that runs DML (select, insert, update, delete) on your database. A ref cursor is a pointer to a result set. This is normally used to open a query on the database server, then leave it up to the client to fetch the result it needs.

What is strong ref cursor?

A ref cursor which has fixed return type is called a Strong Ref Cursor in Oracle Database. Because of fixed return type, strong ref cursors can only be used selectively. For instance with those SELECT statements that return the result whose datatype matches with the one that you have fixed during cursor’s declaration.

Which cursor is faster in Oracle?

Tim Hall, Oracle ACE of the year, 2006: For a long time there have been debates over the relative merits of implicit and explicit cursors. The short answer is that implicit cursors are faster and result in much neater code so there are very few cases where you need to resort to explicit cursors.

What is ref cursor example?

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 diff between strong and weak ref cursor?

Strong ref_cursor will always use to return a value and compiler know the structure during the compile time, but in the weak ref cursor it will not return a value and compiler dosen’t know the structure during the compile time.

Why do we use ref cursor?

Using REF CURSOR s is one of the most powerful, flexible, and scalable ways to return query results from an Oracle Database to a client application. A REF CURSOR is a PL/SQL data type whose value is the memory address of a query work area on the database.

Why cursor is used in Oracle?

Cursors are used when the user needs to update records in a singleton fashion or in a row by row manner, in a database table. The Data that is stored in the Cursor is called the Active Data Set. Oracle DBMS has another predefined area in the main memory Set, within which the cursors are opened.

What is a Pls_integer?

PLS_INTEGER is a PL/SQL data type used for storing signed integers. PLS_INTEGER is defined in the STANDARD package as a subtype (or rather a synonym) of BINARY_INTEGER. PLS_INTEGER operations use machine arithmetic, so they are generally faster than NUMBER and INTEGER operations.

What is index tuning?

Index tuning is part of database tuning for selecting and creating indexes. The index tuning goal is to reduce the query processing time. Index tuning involves the queries based on indexes and the indexes are created automatically on-the-fly.

What is ref cursor and its types?

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.

Is ref cursor return?

REF CURSOR types may be passed as parameters to or from stored procedures and functions. The return type of a function may also be a REF CURSOR type. This provides the capability to modularize the operations on a cursor into separate programs by passing a cursor variable between programs.