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 saicumspecsacont.cf - Free download as PDF File .pdf), Text File .txt) or read online for free.
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Top 50 Oracle Interview Questions and Answers Nested table is a data type in Oracle which is used to support columns .. Download PDF. What is Oracle and what are its different editions? (Top 50 Oracle Interview Questions and Answers pdf). Answer: Oracle is one of the popular database provided. Then we at Wisdomjobs are providing a complete detail on Oracle job Interview Question and Answers on our site page. Go through and prepare well for the.
This is the frequently asked Oracle Interview Questions in an interview. An Oracle database contains one or more logical storage units called tablespaces. These tablespaces collectively store whole data of databases and each tablespace in Oracle database consists of one or more files called datafiles. These datafiles are physical structure that confirm with the operating system in which Oracle is running Top 50 Oracle Interview Questions and Answers pdf.
What is the difference between hot backup and cold backup in Oracle? Tell about their benefits also. Hot backup Online Backup: A hot backup is also known as online backup because it is done while the database is active. Some sites can not shut down their database while making a backup copy, they are used for 24 hour a day, 7 days a week.
Cold backup Offline Backup: All datafiles, All control files, All online redo log files optional and the init. 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. 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. Used to make a transaction permanent. Used to roll back the state of DB to last the commit point.
Weblogic Interview Questions. 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.
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. Varchar can store up to bytes and varchar2 can store up to bytes. 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. 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. As an Oracle DBA, you can expect to be involved in the following tasks:.
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. 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. 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. 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: 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. Non-Equi Joins: A Non-Equi Join condition containing something other than an equality operator.
Outer Joins: Outer Join is used to fetch rows that do not meet the join condition. The Outer Join operator can appear on only one side of the expression, the side that has information missing. It returns those rows from one table that has no direct match in the other table. Cross Join: Cross Join clause produces the cross-product of two tables.
This is same as a Cartesian product between the two tables. Natural Joins: It is equal to the Equi-Join. If the columns have the same names but different data types, than the Natural Join syntax causes an error.
Do not use a table name or alias in the referenced columns. Select a. Joins with the ON clause: Use the ON clause to specify a join condition. The ON clause makes code easy to understand. ON clause is equals to Self Joins.
The ON clause can also be used to join columns that have different names. This option prevents null values from entering the column if a row is inserted without a value for that column.
UNIQUE Key Constraint ensures that every value in a column or set of columns must be unique, that is, no two rows of a table can have duplicate values in a specified column or set of columns.
There can be more than one Unique key on a table. Unique Key Constraint allows the input of Null values. Unique Key automatically creates index on the column it is created. Uniquely identifies each row in the Table. Is also called Referential Integrity Constraint.
Defines a condition that each row must satisfy. It facilitates declaration of variables, functions, and conditional operators in SQL syntax thereby giving the developer more freedom and ease to design complex queries.
It enables writing SQL queries at run-time.
Few common cases where Dynamic SQL can be utilized: A Package is a group of related database objects like stored procs, functions, types, triggers, cursors etc. It is a kind of library of related objects which can be accessed by multiple applications if permitted Top 50 Oracle Interview Questions and Answers pdf. It aids in preventing changes to a view that would produce results not contained in the sub query. Oracledatabasetuning 5. Oracleauditing Oracleapplicationtuning Oracleprocedures Oraclefunctions Oracleloops Oracleexceptions OracleSelectintoclause Oraclestringfunctions Oraclenumericfunctions Oracledatefunctions Oracletranslateanddecode Oraclecorrelatedsubqueries Oracleunion,intersect,minus Oracleclusters Oraclesequences Oracletablespaces Oracleobjectdatatypes OracleTutorial b.
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Ans: Oracle 7. In static cursor database servers executes only one select statement at a time for a single active set area where in ref cursor database servers executes number of select statement dynamically for a single active set area that's why those cursor are also called as dynamically cursor. Generally static cursor does not return multiple record into client application where as ref cursor are allowed to return multiple records into client application Java,.
This is an user defined type so we are creating it in 2 steps process i. What are The Types of Ref Cursors? Ans: In all databases having 2 ref cursors. Strong ref cursor Weak ref cursor Strong ref cursor is a ref cursor which have return type, whereas weak ref cursor has no return type. What is Difference Between trim, delete collection method? What is Overloading Procedures?