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Oracle Interview Questions and Answers
Which trigger are created when master -detail relay?
master delete property
* NON-ISOLATED (default)
a) on check delete master
b) on clear details
c) on populate details
* ISOLATED
a) on clear details
b) on populate details
* CASCADE
a) per-delete
b) on clear details
c) on populate details
which system variables can be set by users?
SYSTEM.MESSAGE_LEVEL
SYSTEM.DATE_THRESHOLD
SYSTEM.EFFECTIVE_DATE
SYSTEM.SUPPRESS_WORKING
What are object group?
An object group is a container for a group of objects.
You define an object group when you want to package
related objects so you can copy or reference them in
another module.
What are referenced objects?
Referencing allows you to create objects that inherit
their functionality and appearance from other objects.
Referencing an object is similar to copying an object,
except that the resulting reference object maintains a
link to its source object. A reference object
automatically inherits any changes that have been made
to the source object when you open or regenerate the
module that contains the reference object.
Can you store objects in library?
Referencing allows you to create objects that inherit
their functionality and appearance from other objects.
Referencing an object is similar to copying an object,
except that the resulting reference object maintains a
link to its source object. A reference object
automatically inherits any changes that have been made
to the source object when you open or regenerate the
module that contains the reference object.
Is forms 4.5 object oriented tool ? why?
yes , partially. 1) PROPERTY CLASS - inheritance
property 2) OVERLOADING : procedures and functions.
Can you issue DDL in forms?
yes, but you have to use FORMS_DDL.
Referencing allows you to create objects that inherit
their functionality and appearance from other objects.
Referencing an object is similar to copying an object,
except that the resulting reference object maintains a
link to its source object. A reference object
automatically inherits any changes that have been made
to the source object when you open or regenerate the
module that contains the reference object. Any string
expression up to 32K:
- a literal
- an expression or a variable representing the text of a
block of dynamically created PL/SQL code
- a DML statement or
- a DDL statement
Restrictions:
The statement you pass to FORMS_DDL may not contain bind
variable references in the string, but the values of
bind variables can be concatenated into the string
before passing the result to FORMS_DDL.
What is SECURE property?
- Hides characters that the operator types into the text
item. This setting is typically used for password
protection.
What are the types of triggers and how the sequence of
firing in text item
Triggers can be classified as Key Triggers, Mouse
Triggers ,Navigational Triggers.
Key Triggers :: Key Triggers are fired as a result of
Key action.e.g :: Key-next-field, Key-up,Key-Down
Mouse Triggers :: Mouse Triggers are fired as a result
of the mouse navigation.e.g. When-mouse-button-presed,when-mouse-doubleclicked,etc
Navigational Triggers :: These Triggers are fired as a
result of Navigation. E.g. : Post-Text-item,Pre-text-item.
We also have event triggers like when ?new-form-instance
and when-new-block-instance.
We cannot call restricted procedures like
go_to(?my_block.first_item?) in the Navigational
triggers
But can use them in the Key-next-item.
The Difference between Key-next and Post-Text is an very
important question. The key-next is fired as a result of
the key action while the post text is fired as a result
of the mouse movement. Key next will not fire unless
there is a key event. The sequence of firing in a text
item are as follows ::
a) pre - text
b) when new item
c) key-next
d) when validate
e) post text
Can you store pictures in database? How?
Yes , in long Raw datatype.
What are property classes ? Can property classes have
trigger?
Property class inheritance is a powerful feature that
allows you to quickly define objects that conform to
your own interface and functionality standards. Property
classes also allow you to make global changes to
applications quickly. By simply changing the definition
of a property class, you can change the definition of
all objects that inherit properties from that class.
Yes . All type of triggers .
If you have property class attached to an item and you
have same trigger written for the item . Which will fire
first?
Item level trigger fires , If item level trigger fires,
property level trigger won't fire. Triggers at the
lowest level are always given the first preference. The
item level trigger fires first and then the block and
then the Form level trigger.
What are record groups ? * Can record groups created at
run-time?
A record group is an internal Oracle Forms data
structure that has a column/row framework similar to a
database table. However, unlike database tables, record
groups are separate objects that belong to the form
module in which they are defined. A record group can
have an unlimited number of columns of type CHAR, LONG,
NUMBER, or DATE provided that the total number of
columns does not exceed 64K. Record group column names
cannot exceed 30 characters.
Programmatically, record groups can be used whenever the
functionality offered by a two-dimensional array of
multiple data types is desirable.
TYPES OF RECORD GROUP:
Query Record Group A query record group is a record
group that has an associated SELECT statement. The
columns in a query record group derive their default
names, data types, and lengths from the database columns
referenced in the SELECT statement. The records in a
query record group are the rows retrieved by the query
associated with that record group.
Non-query Record Group A non-query record group is a
group that does not have an associated query, but whose
structure and values can be modified programmatically at
runtime.
Static Record Group A static record group is not
associated with a query; rather, you define its
structure and row values at design time, and they remain
fixed at runtime.
What are ALERT?
An ALERT is a modal window that displays a message
notifying operator of some application condition.
Can a button have icon and label at the same time ?
-NO
What is mouse navigate property of button?
When Mouse Navigate is True (the default), Oracle Forms
performs standard navigation to move the focus to the
item when the operator activates the item with the
mouse.
When Mouse Navigate is set to False, Oracle Forms does
not perform navigation (and the resulting validation) to
move to the item when an operator activates the item
with the mouse.
What is FORMS_MDI_WINDOW?
forms run inside the MDI application window. This
property is useful for calling a form from another one.
What are timers ? when when-timer-expired does not fire?
The When-Timer-Expired trigger can not fire during
trigger, navigation, or transaction processing.
Can object group have a block?
Yes , object group can have block as well as program
units.
How many types of canvases are there.
There are 2 types of canvases called as Content and
Stack Canvas. Content canvas is the default and the one
that is used mostly for giving the base effect. Its like
a plate on which we add items and stacked canvas is used
for giving 3 dimensional effect.
What are user-exits?
It invokes 3GL programs.
Can you pass values to-and-fro from foreign function ?
how ?
Yes . You obtain a return value from a foreign function
by assigning the return value to an Oracle Forms
variable or item. Make sure that the Oracle Forms
variable or item is the same data type as the return
value from the foreign function.
After assigning an Oracle Forms variable or item value
to a PL/SQL variable, pass the PL/SQL variable as a
parameter value in the PL/SQL interface of the foreign
function. The PL/SQL variable that is passed as a
parameter must be a valid PL/SQL data type; it must also
be the appropriate parameter type as defined in the
PL/SQL interface.
What is IAPXTB structure ?
The entries of Pro * C and user exits and the form which
simulate the proc or user_exit are stored in IAPXTB
table in d/b.
Can you call WIN-SDK thru user exits?
YES.
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