Database Administration Questions

Q:

The database schema is written in

A) DDL B) HLL
C) DCL D) DML
 
Answer & Explanation Answer: A) DDL

Explanation:

The database schema is written in DDL. A data definition language or data description language (DDL) is a syntax similar to a computer programming language for defining data structures, especially database schemas.

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Q:

What is WHEN-Database-record trigger?

Answer

Fires when oracle forms first marks a record as an insert or an update. The trigger fires as soon as oracle forms determines through validation that the record should be processed by the next post or commit as an insert or update. Generally occurs only when the operators modifies the first item in the record, and after the operator attempts to navigate out of the item.

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Q:

What is the difference between OLE Server & OLE Container?

Answer

An OLE server application creates ole Objects that are embedded or linked in OLE Containers ex. OLE servers are ms_word & ms_excel. OLE containers provide a place to store, display and manipulate objects that are created by ole server applications. Ex. oracle forms is an example of an OLE Container.

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Q:

Which among the following are the capabilities of the Cursor?

A) It reads every row one by one. B) It can be parameterised and hence are flexible
C) It can be positioned to specific rows D) All the above
 
Answer & Explanation Answer: D) All the above

Explanation:

All the above listed actions are the functions of cursor

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Q:

A table is classified as a parent table and you want to drop and re-create it. How would you do this without affecting the children tables?

Answer

Disable the foreign key constraint to the parent, drop the table, re-create the table, enable the foreign key constraint.

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Q:

What does coalescing a tablespace do?

Answer

Coalescing is only valid for dictionary-managed tablespaces and de-fragments space by combining neighboring free extents into large single extents.

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Q:

What is database clusters?

Answer

Group of tables physically stored together because they share common columns and are often used together is called Cluster.

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Q:

Give the sequence of execution of the various report triggers?

Answer

Before form , After form , Before report, Between page, After report.

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