Oracle interview questions and answers pdf


 

Download Complete Oracle Interview Questions PDF. Each question contains their answer also. Its a good practice to go through all of these questions before. Here we provide most common interview question and answers for Oracle and and Answers PDF |SQL | SQL SERVER | Latest Oracle Interview Questions and. Oracle interview questions and answers - Oracle FAQ osakeya.info - Free download as PDF File .pdf), Text File .txt) or read online for free.

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Oracle Interview Questions And Answers Pdf

Top 50 Oracle Interview Questions and Answers Nested table is a data type in Oracle which is used to support columns .. Download PDF. Top 50 Oracle Interview Questions and Answers pdf, You can crack the interview to achieve your osakeya.info Provide Videos & Scenario based. Oracle interview questions: Find top 30 oracle interview questions and answers for freshers. An interviewer may ask you these questions on osakeya.info is a.

Ans: Set operator facilitates the user to fetch the data from two or more than two tables at once if the columns and relative data types are same in the source tables. UNION operator returns all the rows from both the tables except the duplicate rows. MINUS returns rows from the first table, which does not exist in the second table. Q 23 Can we convert a date to char in Oracle and if so, what would be the syntax? Ans: Transaction occurs when a set of SQL statements are executed in one go. To control the execution of these statements, Oracle has introduced TCL i. Transaction Control Statements that use a set of statements. Q 25 What do you understand by a database object? Can you list a few of them? Ans: An object used to store the data or references of the data in a database is known as a Database object. The database consists of various types of DB objects such as tables, views, indexes, constraints, stored procedures, triggers etc. Q 26 What is a Nested table and how is it different from a normal table?

Are you preparing to attend an Oracle interview soon? Here are a few questions and answers you may find interesting.

Oracle Interview Questions

RAW data type is used in storing values in binary data format. The maximum size of a RAW in a table is bytes.

A BLOB data type is a binary string with a varying length which is used in storing two gigabytes memory. NULL value represents unknown or missing data. It is used as a place holder or represented as a default entry indicating that no actual data is present. It aids in preventing changes to a view that would produce results not contained in the sub query.

Varchar can store up to bytes and varchar2 can store up to bytes.

The five query types in Oracle are as follows: Compound queries, Nested queries, Correlated queries, Subqueries Normal queries. Explain Parameter file in Oracle. The two types of Oracle supported parameter files are: Initialization parameter file — Text version and Server parameter file — Binary version Based on individual installations users can specify their individual initialization parameters.

Differentiate between function and procedure in Oracle. Explain constraining triggers. Explain overloading.

500 Oracle interview questions and answers - Oracle FAQ PDF.pdf

Can functions be overloaded? Define Oracle database. What is ceil and floor in Oracle? Give the different types of rollback segments.

The different types of rollback segments are: Private Available to particular instance and Public Available to all instances. Why do you create or replace procedures rather that drop and recreate.

Is a rollback possible to any savepoint? For a complete cold backup the following files must be backed up. All datafiles, All control files, All online redo log files optional and the init. What is the difference between pre-select and pre-query?

Answer : A pre-query trigger fire before the query executes and fire once while you try to query. With the help of this trigger you can modify the where clause part dynamically. Pre-select query fires during the execute query and count query processing after Oracle forms construct the select statement to be issued, but before the statement is actually issued. Pre-query trigger fires before Pre-select trigger. Answer: Transaction occurs when a set of SQL statements are executed in one go. To control the execution of these statements, Oracle has introduced TCL i.

Transaction Control Statements that use a set of statements top 50 oracle interview questions and answers pdf. Can we save images in a database and if yes, how? This datatype has the capacity of holding data up to 4 GB. What is a View and how is it different from a table?

Answer: A view is a user-defined database object that is used to store the results of a SQL query, which can be referenced later. Views do not store this data physically but as a virtual table, hence it can be referred as a logical table. The table can be updated or deleted while Views cannot be done so. Answer: Global variable is the one, which is defined at the beginning of the program and survives until the end.

It can be accessed by any methods or procedures within the program, while the access to the local variable is limited to the procedure or method where it is declared. What is the difference between varchar and varchar2 data types?

What is a Oracle Database? Answer: Oracle provides software to create and manage the Oracle database. The database consists of physical and logical structures in which system, user, and control information is stored. The software that manages the database is called the Oracle database server. Collectively, the software that runs oracle and the physical database are called the Oracle database system.

A database buffer cache stores the data in memory for quicker access. The redo logs track and store all the changes made to the database. A Data Guard ensures data protection and high availability of data and control file records the physical structure of the database. Click on the above link to read more and to become a Oracle DBA.

Oracle-sql Interview Questions And Answers in pdf - Oracle

Answer: The objects as such can be stored in the database. The language of the DBMS can be integrated with an object- oriented programming language. The language may even be exactly the same as that used in the application, which does not force the programmer to have two representations of his objects.

In large enterprise environments, the job is often divided among several DBAs, each with their own area of specialty, such as the database security administrator or database tuning expert. Differentiate between a cluster and a grid? Answer: Clustering is one technology used to create a grid infrastructure. Simple clusters have static resources for specific applications by specific owners. Grids, which can consist of multiple clusters, are dynamic resource pools shareable among many different applications and users.

A grid does not assume that all servers in the grid are running the same set of applications. Applications can be scheduled and migrated across servers in the grid. Grids share resources from and among independent system owners. At the highest level, the idea of grid computing is computing as a utility. In other words, you should not care where your data resides, or what computer processes your request. You should be able to request information or computation and have it delivered — as much as you want, and whenever you want.

The goal is to make computing a utility, a commodity, and ubiquitous. Resource allocation ensures that all those that need or request resources are getting what they need, that resources are not standing idle while requests are going unserviced. Information sharing makes sure that the information users and applications need is available where and when it is needed. High availability features guarantee all the data and computation is always there, just like a utility company always provides electric power.

What is meant by recursive hints in oracle? Answer: Number of times a dictionary table is repeatedly called by various processes is known as recursive hint. It occurs because of the small size of data dictionary cache.

Explain all Joins used in Oracle 8i? Answer: Cartesian Join: When a Join condition is invalid or omitted completely, the result is a Cartesian product, in which all combinations of rows are displayed. For ex: to join four tables, a minimum of three joins is required. This rule may not apply if the table has a concatenated primary key, in which case more than one column is required to uniquely identify each row.

Equi Join: This type of Join involves primary and foreign key relation. Equi Join is also called Simple or Inner Joins.

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