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Use the NOCOPY Compiler Hint
By default, the OUT and IN OUT parameters are passed by the value i.e. the value of an IN OUT actual parameter is copied into the corresponding formal parameter. Then, if the subprogram exits generally, the values assigned to OUT and IN OUT formal parameters are copied into the corresponding actual parameters.
If the parameters hold large data structures like records, collections, and instances of object types, all this copying slows down the execution and uses up memory. To secure that, you can specify the NOCOPY hint, that allows the PL/SQL compiler to pass OUT and IN OUT parameters by reference. In the illustration below, you ask the compiler to pass IN OUT parameter my_unit by reference rather by value:
DECLARE
TYPE Platoon IS VARRAY(200) OF Soldier;
PROCEDURE reorganize (my_unit IN OUT NOCOPY Platoon) IS ...
BEGIN
...
END;
Selecting Objects: Suppose that you have run the SQL*Plus script below that creates object type Person and object table persons, and that you have settled the table: CREATE
How Bulk Binds Improve Performance The assigning of values to the PL/SQL variables in SQL statements is known as binding. The binding of the whole collection at once is know
Query: SELECT * FROM EMPLOYEE1; Select 5 columns and all rows from one table Query: SELECT C_ID, COMPANY, BUILDING, DEPARTMENT, BRANCH FROM CONTRACT;
LOOP Statements The LOOP statements execute a series of statements at multiple times. The loops enclose the series of statements that is to be repeated. The PL/SQL provides typ
(a) What are decision support systems, and what role do they play in the business environment? (b) Data warehousing is defined as "a subject-oriented, integrated, non-volatile c
Cursor Attributes The Cursors and cursor variables have 4 attributes which give you helpful information about the execution of a data manipulation statement. Syntax:
Parameter Modes: You do not require to specify a parameter mode for the input bind arguments (those used, for illustration, in the WHERE clause) as the mode defaults to IN. Th
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
Datatypes Every constant and variable has a datatype that specifies the storage format, constraints, and the valid range of values. The PL/SQL gives a variety of predefined dat
Consider the schema for FreeChecking Bank, that we designed given below. Translate the given ER schema into SQL CREATE TABLE statements (indicating primary key, unique and foreign
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