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DataBase Administrator (DBA) Interview Questions and Answers

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232. What is snapshot log?

It is a table that maintains a record of modifications to the master table in a snapshot. It is stored in the same database as master table and is only available for simple snapshots. It should be created before creating snapshots.


233. What are the benefits of distributed options in databases?

Database on other servers can be updated and those transactions can be grouped together with others in a logical unit. Database uses a two phase commit.


234. What is an index? How it is implemented in Oracle database?

An index is a database structure used by the server to have direct access of a row in a table. An index is automatically created when a unique of primary key constraint clause is specified in create table command


235. What are clusters?

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


236. What is a cluster key?

The related columns of the tables are called the cluster key. The cluster key is indexed using a cluster index and its value is stored only once for multiple tables in the cluster.


237. How can we reduce the network traffic?

Replication of data in distributed environment.
- Using snapshots to replicate data.
- Using remote procedure calls.


238. Differentiate simple and complex, snapshots?

A simple snapshot is based on a query thaat does not contains GROUP BY clauses, CONNECT BY clauses, JOINs, sub-query or snapshot of operations. - A complex snapshots contain at least any one of the above.


239. What are the Built-ins used for sending Parameters to forms?

You can pass parameter values to a form when an application executes the call_form, New_form, Open_form or Run_product.


240. Can you have more than one content canvas view attached with a window?

Yes. Each window you create must have at least one content canvas view assigned to it. You can also create a window that has manipulated content canvas view. At run time only one of the content canvas views assign to a window is displayed at a time.


241. Is the After report trigger fired if the report execution fails?

Yes.

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