oracle dba questions and answers pdf

Oracle Dba Questions And Answers Pdf

By Gano P.
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Here, we have gathered a set of questions that will help candidates who are at the intermediate level as well as any job seeker to clear the interview successfully. Q 1 Why do we use the materialized view instead of a table or views?

Answer: Oracle Database is a relational database management system RDBMS which is used to store and retrieve the large amounts of data. Oracle Database had physical and logical structures. Logical structures and physical structures are separated from each other. Answer :Oracle database is the collection of datafiles,redologs and control files while Oracle instance is the SGA ,processes in the Memory.

Top Oracle DBA Interview Questions and Answers

Answer: Oracle Database is a relational database management system RDBMS which is used to store and retrieve the large amounts of data. Oracle Database had physical and logical structures. Logical structures and physical structures are separated from each other. Answer :Oracle database is the collection of datafiles,redologs and control files while Oracle instance is the SGA ,processes in the Memory.

We can have 1 or more instance serving a oracle database. In Oracle RAC , we have one set of datafiles,control file and redo logs while instance on one ore more boxes accesses the same database. Question 3 What is a Tablespace? Physically, data will get stored in Datafiles.

Datafiles will be connected to tablespace. A tablespace can have multiple datafiles. It contains read only data dictionary tables which contains the information about the database.

Answer: The datafiles contain all the database data. The data of logical database structures, such as tables and indexes , is physically stored in the datafiles allocated for a database. Answer: Every Oracle database has a control file. A control file contains entries that specify the physical structure of the database such as Database name and the Names and locations of datafiles and redo log files. Answer The primary function of the redo log is to record all changes made to data. If a failure prevents modified data from being permanently written to the datafiles, then the changes can be obtained from the redo log, so work is never lost.

This prevents oracle from overwriting the redo log files before they have been safely archived to another location. Answer: A user account and its associated data including tables, Oracle views , indexes, clusters, sequences ,procedures, functions, triggers,packages and database links is known as Oracle schema.

Answer: Data Blocks are the base unit of logical database space. Each data block represents a specific number of bytes of database space on a disk.

The data blocks can be 4 K,8 K size depending on the requirement. Question What is an Extent? Answer :Extent is a collection of Continuous data blocks, which is used for storing a specific type of information. What is a Segment? Answer: A segment is a collection of extents which is used for storing a specific data structure and resides in the same tablespace.

What is Rollback Segment? Answer: Database contain one or more Rollback Segments to roll back transactions and data recovery. What are the different type of Segments? What is archive-log and No archive log mode?

Answer: We all know that redo logs stored the redo information and redo log files are in circular fashion. Oracle Database lets you save filled groups of redo log files to one or more offline destinations, known collectively as the archived redo log.

The process of turning redo log files into archived redo log files is called archiving. The background process ARCn automates archiving operations when automatic archiving is enabled. The database starts multiple archiver processes as needed to ensure that the archiving of filled redo logs does not fall behind. No archive log means archive log are not generated and redo are overwritten. What all things are present in the shared pool? Answer: The shared pool portion of the SGA contains three major areas: library cache contains parsed sql statements,cursor information,execution plans dictionary cache contains cache -user account information,privileges information,datafile,segment and extent information buffers for parallel execution messages control structure.

What is hotbackup? Answer: If the database must be up and running 24 hours a day, seven days a week, then you have no choice but to perform inconsistent backups of the whole database. A backup of online data files is called an online backup. Oracle table locks. You have many instances running on the same UNIX box. How can you determine which shared memory and semaphores are associated with which instance?

What is Database index? Answer: A database index is a data structure that improves the speed of data retrieval operations on a database table at the cost of slower writes and increased storage space. By default, Oracle creates B-tree indexes. Related article Oracle Indexes Question Mechanism followed by Oracle when we are taking hotbackup. Lets take the example of Oracle version What is that trace files contains and the utility used to read them?

Trace file contains the detail diagnostics of a sql statement like explain plan, physical reads, logical reads, buffer gets etc. Tkprof utility is used to convert trace file into readable format.

If we want to access objects of another database from this database then we need a database link from this database to the other. What is a patch? Question 34 Which table you will query to check the tablespace space issues? Question 35 Which table u will query to check the temp tablespace space issues? Inventory should be set in file oraInst.

How to run Opatch in non interactive form. The Global Inventory is the part of the XML inventory that contains the high level list of all oracle products installed on a machine. There should therefore be only one per machine. Its location is defined by the content of oraInst. All about AWR. It is New feature in Oracle database post It Uses past block images to back out changes to a oracle database. As the name suggest, we can use this flashback database in previous time.

During normal database operation, Oracle occasionally logs past block images in flashback logs b. Oracle automatically creates, resizes and deletes flashback logs in the flash recovery area d. DBA should be aware of flashback logs to monitor performance,to decide how much space to allocate to flash recovery area e. Allows database to be recovered to a previous time to correct problems caused by logical data corruptions,user errors Flashback database explained and limitation.

What is Leaf Block in index? The blocks above the HWM level is free blocks, they are ready to use. The blocks below the HWM level is used blocks, they are already used. What parameters are used to set parallelism in the database? Answer: Following initialization parameters are required for parallelism setup in database.

What is difference between startup mount and startup nomount? Answer The system change number SCN is an ever-increasing value that uniquely identifies a committed version of the database at a point in time. Every time a user commits a transaction Oracle records a new SCN in redo logs.

Oracle uses SCNs in control files datafile headers and redo records. Every redo log file has both a log sequence number and low and high SCN. Answer A library cache lock means that a session is waiting to use or change an object definition or to use a SQL statement that another session is loading, changing or parsing, or is waiting to change or parse.

This usually indicates that database object definitions are being changed regularly. Another example is gathering statistics on an object. When statistics are gathered all references to that object in the shared pool or library cache become invalid, requiring a new hard parse for each SQL statement referencing the object. Statistics should only be gathered when there are no active users or system activity is very low.

How to take global hanganalyze dump? How do you recover the database if you lost one of the controlfile in the database? Change Init. Database recovery various cases and solution. How do you recover the database if you lost all of the controlfile in the database? Shutdown Instance abort b. If the control-file backup is available ,then restore it from backup or if you have got the controlfile information in trace using alter database backup controlfile to trace c.

Once the controlfile is created, recover database using backup controlfile. You will need to apply the redo logs to complete the recovery d, alter database open resetlogs;. We can avoid the resetlogs by using the steps below 1. After the database is mounted with restore of controlfile from backup,create a trace of the controlfile using the command below alter database backup controlfile to trace; 2. Now take out the create controlfile statement from the trace.

Recreate the controlfile using the above portion.

Top Oracle DBA, RAC, and Performance Tuning Interview Questions

What is Oracle and what are its different editions? Answer: Oracle is one of the popular database provided by Oracle Corporation, which works on relational management concepts and hence it is referred to as Oracle RDBMS as well. It is widely used for online transaction processing, data warehousing, and enterprise grid computing. What is a Data Dictionary and how can it be created? Answer : Whenever a new database is created, a database-specific data dictionary gets created by the system.

Oracle DBA Interview Questions and Answers

There is a parcel of chances from many presumed organizations on the planet. In this way, despite everything you have the chance to push forward in your vocation in Oracle DBA Development. By this Oracle DBA Interview Questions and answers, many students are got placed in many reputed companies with high package salary. Same 30 Mins, We will apply the opatch for oracle binary only not for data. If not we will either create new indexes or can use hints to specify which indexes to use.

Synonym, B. Table space, c System server, d Dynamic data replication Ans : D. Simple snapshots, B. Complex snapshots, C. Neither A nor B Ans : A.

This list includes characteristics of the Oracle database, roles of a Database Administrator, tools used for administering the Oracle database, comparing a cluster with a grid, the architecture of Oracle Grid Computing, and more. Many organizations are hiring Oracle DBA experts to meet their requirements and the needs and demands of their customers. In case you are looking for Oracle DBA interview questions, this is the correct place for you. What is Oracle? What is an Oracle Database?

Oracle DBA Interview Questions

Oracle dba interview questions and answers

There are a lot of opportunities from many reputed companies in the world. According to research, Oracle DBA has a market share of about 0. This course will help you to achieve excellence in this domain. Oracle automatically maintains and uses indexes and when any change is made in the table data Oracle automatically distributes it into relevant indexes. Oracle usually publishes a major release once a 4 year. This digit is usually followed by a character describing the nature of the release.

Read the most frequently asked top Oracle DBA interview questions and answers for freshers and experienced job interview questions pdf. What are four common errors found in an alert. If we are getting any issue regarding database while performing any activity we should check alert log file in dump destination.. The four common error we find in alert. What is growth factor?


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1 Comments

  1. Fleur M.

    Is dost downloadable pdf long bond paper or short first aid for the usmle step 2 cs 6th edition pdf

    09.06.2021 at 04:45 Reply

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