Are you looking for Oracle Apps DBA jobs?Then we in Wisdomjobs collectively provided a detail amount of basics of Oracle and in-depth details about Oracle Apps DBA Interview Questions and Answers along with the various job roles. Question 68. Here we provide most common interview question and answers for Oracle and rdbms. Question 46 What is Global inventory or central inventory? 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 messagescontrol structure. Question 75 What is the difference between CPU and PSU patching? What is called as Views in RDBMS. Oracle Performance Tuning Interview Questions and answers are prepared by 10+ years of experienced industry experts. Main storage structures. A BLOB data type is a binary string with a varying length which is used in storing two gigabytes memory. (only need to change the value no need to bounce)DEFERRED : We can change the parameter in fly database but this will effect after restart the database only. Question 29. Answer: Materialized view is a … Bookmark this post “SQL Interview Questions And Answers for Experienced” for future reference. Related articleOracle IndexesQuestion 21. we can find general locks with the following query: If it’s a dead lock, we need to kill that session. SELECT inst_id,DECODE(request,0,’Holder: ‘,’Waiter: ‘)||sid sess,  id1, id2, lmode, request, type  FROM GV$LOCK  WHERE (id1, id2, type) IN  (SELECT id1, id2, type FROM gV$LOCK WHERE request>0)ORDER BY id1, request ; The high water mark level is just a line separate the used blocks and free blocks. ... (In Oracle, procedures cannot directly return a value). top is a operating system command, it will display top 10 processes which are taking high cpu and memory. Execution Plan: This is a useful SQL server tool, as query execution plans can be used to establish processes that need to be fine-tuned in order for a query to run faster. Answer: On a higher level, there … What is the port numbers used for SQL Server services? Question 76 How to verify whether a parameter changed required database bounce or not? Answer:Oracle database is the collection of datafiles,redologs and control files while Oracle instance is the SGA ,processes in the Memory. It also gives an opportunity to the companies to store the massive amount of structured and unstructured data in real time. If you're looking for Oracle Apps DBA Interview Questions for Experienced or Freshers, you are at the right place. How do you switch from an init.ora file to a spfile? There is one Local Inventory per ORACLE_HOME. What are the uses, Tell about various types of queries that you know. Logical structures and physical structures are separated from each other. 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. 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. You are experiencing high “busy buffer waits” . What is Physical Block Corruptions? Question 80 . This is … This kind of block corruptions are normally reported by Oracle with error ORA-1578 and the detailed corruption description is printed in the alert log. 2. Question 27 What is the syntax for tkprof? Oracle Concepts and Architecture Interview Questions and Answers. Read Biztalk XSLT Questions, get success at job interview. A tablespace can have multiple datafiles. the PSU contains the CPU + some technical bugs fixed. RMAN stands for the Recovery Manager. Oracle DBA Interview Questions and answers are prepared by 10+ years experienced industry experts. Recommended BooksOCA/OCP Oracle Database 12c All-in-One Exam Guide (Exams 1Z0-061, 1Z0-062, & 1Z0-063)Oracle Database 12c DBA Handbook (Oracle Press)Oracle DBA All-in-one Scripts – A guide every DBA must have: Oracle dba scripts collection used by expert database administrators everyday. The fourth digit identifies a release level specific to a component. Oracle 11g dba interview questions and answers for both freshers and experienced - DBMS Introduction, ORACLE ARCHITECTURE, ORACLE Installation, Oracle Environment Variables, Managing physical structures (control files, data files, redo log files), Backup … How to take global hanganalyze dump?Answer, Question 64. Home > Interview Question and Answer > Oracle > Oracle Concepts and Architecture . Oracle Documentation. Mention Oracle DBA Characteristics. Let's start!! What is an Oracle Instance? To clear any interview, one must work hard to clear it in first attempt. 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. Another example is gathering statistics on an object. We will migrate a row when an update to that row would cause it to not fit on the block anymore (with all of the the «forwarding address». … Question 60. Here are seven common DBA interview questions with example answers to help you craft your own effective responses: 1. How to find  Last password change of a user? According to research, Oracle Apps DBA has a market share of about 0.8%.So, You still have the opportunity to move ahead in your career in Oracle Apps DBA Development. These are top Oracle DBA Interview Questions and answers, prepared by our institute experienced trainers. ... , Digital Experience. Oracle Performance Tuning Interview Questions And Answers. oracle apps dba interview questions: 60 awesome oracle apps dba interview questions.Must read to succeed in interviews and jobs oracle apps technical interview questions and answers: 19 oracle apps technical interview questions and answers to succeed in your career. Allows database to be recovered to a previous time to correct problems caused by logical data corruptions,user errorsFlashback database explained and limitation. Tkprof utility is used to convert trace file into readable format. Learn Database Management System, purpose of database and more.. The command returns the release information, opatch is utility to apply database patch , In order to find opatch version execute”$ORACLE_HOME/OPatch/opatch version”Even if you simple write $ORACLE_HOME/OPatch/opatch, it will show the opatch version in the start. What are the different types of backups that are available in Oracle? Question 13. Question 30 How to find Database version ? You must take if you plan to work on AWSOracle Database: Oracle 12C R2 RAC Administration : This course covers installation, administration of Oracle RAC. Download PDF. What is High Water Mark in Oracle? This will test your knowledge on var… […]. According to research, Oracle Data Guard has a market share of about 0.1%. Question 23 How to find the database/sqlplus version? Answer: The answer would be depending on the versions you have worked on, I would say I have experience working in SQL Server 7, SQL Server 2000, 2005 and 2008. These questions are common for both Senior Oracle DBA or Junior DBA. 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. Oracle Concepts and Architecture Interview Questions and Answers includes, Physical database, structure of Oracle Database, components of Logical database, Tablespace, SYSTEM tablespace, relationship among Database, schema, Schema … Many times the below query also works in wonderful manner, Question 63. Answer: Semijoin returns records from the left table … What is a patch?Answer A patch can be a solution for a bug/it can be a new feature. Here is the list of most frequently asked Oracle DBA Interview Questions and answers in technical interviews. SQL Server DBA Interview Questions and answers are very useful to the Fresher or Experienced person who is looking for a new challenging job from the reputed company. 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. Oracle Forms Interview Questions Answers pdf free oracle forms interview questions answers manual pdf pdf file ... with an Oracle database. Oracle DBA Interview Questions and answers for the job placements. If you are looking for DBA Database Tuning Interview Questions, here is the comprehensive list. Oracle Database Administrator Interview questions and answers. alter database open. 1. Question 8 What is Parameter Files (initSID.ora)Answer:Parameter files contain a list of configuration parameters for that instance and database. Learn Oracle, PHP, HTML,CSS,Perl,UNIX shell scripts, This article contains the most commonly asked top 80 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. Question 56. If you have additional Oracle questions, feel free to comment and let us know. How to run Opatch in non interactive form. Question 77 How do we check if a Database upgrade is successful? ... Man you are 9+ years experience in Oracle DBA, how on earth you don't have RAC Installation Experience. We will check the inventory directory permission, try to apply the patch after giving 777 permissions to that inventory directory. Also, Read Mongo Db Interview Questions Question 71. Oracle Interview Questions and Answers. A good course for Oracle DBA who want to upgrade his skills for Oracle Dataguard. Home > Interview Question and Answer > Oracle > Oracle Concepts and Architecture . You are here: Home 1 / Latest Articles 2 / Database 3 / Top 50 Oracle Interview Questions and Answers Top 50 Oracle Interview Questions and Answers last updated December 18, 2020 / 12 Comments / in Database / by admin Great post. 10g R1, 10g R2, 11g R1, 11g R2, 12c R1. How can you rebuild an index? Question 2 What is ASM instance in Oracle? What is an Extent ?Answer:Extent is a collection of Continuous data blocks, which is used for storing a specific type of information. Question 7 What is Archive Log Files ?Answer:Oracle automatically archives log files when the database is in ARCHIVELOG mode. Over the last 11 years he has worked with systems in Australia, the United Kingdom, Southeast Asia, Western Europe, and the United States. Must have dba scripts for your daily activities! eval(ez_write_tag([[300,250],'techgoeasy_com-medrectangle-4','ezslot_1',109,'0','0']));Question 9 What is schema?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. It represents a major new version of the software that contains significant new functionality. Oracle automatically creates, resizes and deletes flashback logs in the flash recovery aread. If the table is fragmented, how would you rebuild it? The fifth digit identifies a platform-specific release. As the name suggest, we can use this flashback database in previous time, a.During normal database operation, Oracle occasionally logs past block images in flashback logsb.Flashback logs are  written sequentially not archivedc. This column contains three phases 1) Immediate 2) DEFERRED 3) False. Why SQL server is better than other databases? It is used as a place … Inventory should be set in file oraInst.loc @/var/opt/oracle or /etc and Oracle home must be registered in Central inventory, The oraInventory is the location for the OUI (Oracle Universal Installer)’s book keeping. Now take out the create controlfile statement from the trace. Question 53. Secondly we need to rebuild all its indexes, Finally we should gather the stats on the table, Question 67. 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. What is Rollback Segment ?Answer:Database contain one or more Rollback Segments to roll back transactions and data recovery. Every redo log file has both a log sequence number and low and high SCN. Mention Oracle DBA Characteristics. Mention what is cluster? Question 28. Temp tablespace is used by so many application programs for sorting and other stuff. A Consistent backup is one in which the files being backed up contain … DBA should be aware of flashback logs to monitor performance,to decide how much space to allocate to flash recovery areae. Question 10 What is data blocks ?Answer:Data Blocks are the base unit of logical database space. Posted by Rashmi. These questions are common for both Senior Oracle DBA or Junior DBA. Datafiles will be connected to tablespace. While the reader is not expected to possess detailed knowledge about Oracle internals, he is expected to have a decent understanding of Oracle architecture, advanced features and responsibilities of an Oracle DBA. Questions about DBA experience and background. What is a database link? oracle apps technical interview questions and answers, oracle dba interview questions for experienced professionals, top 40 oracle dba interview questions and answers, https://www.janbasktraining.com/blog/top-sql-server-interview-questions-and-answers/, Oracle Database Insurance Agent Interview | List of Insurance Firms, Database Insurance Agent Interview Questions Answers | List of Insurance Firms, Oracle Indexes and types of indexes in oracle with example, Top 30 Most Useful Concurrent Manager Queries, How to find table where statistics are locked, How to find weblogic version in Unix & Windows. NoSQL interview questions: NoSQL can be termed as a solution to all the conventional databases which were not able to handle the data seamlessly. Oracle Interview Questions and Answers. […] This post has awesome oracle dba and to succeed in any oracle . Question 49 How to enable trace at database level? The maximum size of a RAW in a table is 32767 bytes. Oracle Data Integrator (ODI) Interview Questions. E.g. Add New Question. Hash Cluster is a technique used for storing the table to make it faster to retrieve. 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 tracec. SQL Server DBA Interview Questions and answers are prepared by 10+ years experienced industry experts. The parameter modes that can be passed to a procedure are IN, OUT and INOUT. Database creates “SYSTEM tablespace” by default during database creation. Answer. What are the different type of Segments ?Answer. To have a great development in Oracle DBA work, our page furnishes you with nitty-gritty data as Oracle DBA prospective employee meeting questions and answers. How do you recover the database if you lost one of the controlfile in the database?Answer, Change Init.ora file to remove the lost controlfile or copy the existing controlfile to that locationstartup the database, Check below link for all the useful scenario for recovery, Database recovery various cases and solution. It is an Oracle Database client that is used for the backup and recovery tasks on our databases and it can also automate the administration of our backup strategies. The background process ARCn automates archiving operations when automatic archiving is enabled. Row chaining happens when a  row is too large to fit into a single database block. The WITH CHECK option clause specifies the level of check to be done in DML statements. In v$parameter we can find one column ie. Index in database. Answer: We can rebuild the index using the below command, You can use parallel to speed up the rebuild. Question 3 What is a Tablespace?Answer: Oracle use Tablespace for logical data Storage. This requires that you run your database in ARCHIVELOG mode.eval(ez_write_tag([[250,250],'techgoeasy_com-box-4','ezslot_8',110,'0','0'])); Question 18. which views is used to finding the locking in the database?Answer: v$lock, v$session, v$process. Oracle Interview Questions and Answers. What is a primary key? Question 39 How to generate the AWR report, what is PSU patch and how to verify the PSU update in the Oracle Home. Oracle DBA Interview Questions and answers for the job placements Here is the list of most frequently asked Oracle DBA Interview Questions and answers in technical interviews. This questions are frequentlyasked in all interviews. Run the following query to find out the p1,p2 and p3 of a session causing buffer busy wait, After that running the following query to find the segment causing buffer busy wait:-, Question 70. 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Question 55. A backup of online data files is called an online backup. (here we need to edit using spfile and bounce the database)False : Compulsory we need to down the database i.e Static. Answer check the below link for Detailed explanationeval(ez_write_tag([[300,250],'techgoeasy_com-banner-1','ezslot_7',111,'0','0'])); Mechanism followed by Oracle when we are taking hotbackup. Question 45 What are different types of inventories? Read Biztalk XSLT Questions, get success at job interview. The below matrix explains the number of the Oracle version, Lets take the example of Oracle version 10.2.0.4.010 – Major database release number2 – Database Maintenance release number0 – Application server release number4 – Component Specific release number0 – Platform specific release number. When different platforms require the equivalent patch set, this digit will be the same across the affected platforms. Question 37 How to find out invalid objects in the apps schema in the database? How do you recover the database if you lost all of the controlfile in the database? This DBA Interview Questions and Answers are basic and advance level so every one who is DBA can get more help with these database interview questions and answers tutorial and guide. Oracle DBA Characteristics. 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. Why do we use the materialized view instead of a table or views? Its location is defined by the content of oraInst.loc.The Global Inventory records the physical location of Oracle products installed on the machine, such as ORACLE_HOMES (RDBMS and IAS) or JRE. Bad header – the beginning of the block (cache header) is corrupt with invalid valuesThe block is Fractured/Incomplete – header and footer of the block do not matchThe block checksum is invalidThe block is misplaced. Question 5 what is Control Files?Answer:Every Oracle database has a control file. Oracle DBA Characteristics. how can you find what’s causing it?Answer Buffer busy wait means that the queries are waiting for the blocks to be read into the db cache.There could be the reason when the block may be busy in the cache and session is waiting for it. It is one of the important Oracle DBA Interview Questions. 1. Question 25 .What is the location of init.ora ? Once the controlfile is created, recover database using backup controlfile. A good course for Oracle DBA who want to upgrade his skills for Oracle RACOracle Data Guard: Database Administration for Oracle 12C R2 :This course covers installation, administration of Oracle Dataguard. Question 57. While Varchar will occupy space for NULL value, Varchar2 will not occupy any space. These questions and answers are suitable for both freshers and experienced professionals at any level. Question 11. 8. What Is Consistent Backup? The Global Inventory gets updated every time you install or de-install an ORACLE_HOME on the machine, be it through OUI Installer, Rapid Install, or Rapid Clone. How to create it? Also, Read Mongo Db Interview Questions This prevents oracle from overwriting the redo log files before they have been safely archived to another location. What is an Oracle Instance? Question 34 Which table you will query to check the tablespace space issues? We can create a new Schema/User. What all things are present in the shared pool? contains the CPU and the some others Important bugs fixes). Oracle DBA interview. Question 19. What is Leaf Block in index ?Answer: Leaf block rows hold the pairs stored by the B-tree. Spfile from pfile ; shutdown instancestartup have objects from different schema ’ s and a schema can different. The table to make it faster to retrieve the blocker for Library lock... Real time overwriting the redo log file has both a log sequence number and low and high SCN records lowest. 32 how to find out invalid objects in the world is controlled by ASM! With versions 6.0.36 and 7.0.12 free Oracle Forms Interview Questions Introduction to RMAN Interview Interview Questions answers!, privilegs, backup and recovery what parameters are used with two or more instance serving a database... An online backup not directly return a value ), Rollback Segment? Answer Oracle. Unit of logical database space Oracle Performance Tuning Interview Questions and answers, by. Cold backup three phases 1 ) Immediate 2 ) DEFERRED 3 ) False the of. Software is patched using OPATCH utility this prevents Oracle from overwriting the redo log files when the database numbers. Common for both freshers and experienced Oracle professionals.Download Complete Oracle Interview Questions and Interview process for 24.... Block or Segment header wait parameter in fly database i.e Static question 76 to. At job Interview to data secondly we need to edit using spfile oracle dba interview questions and answers for experienced pdf. Is a binary large object datatype verify the PSU update in the flash recovery.... Archiving is enabled or not for your database? Answer the ASM functionality is controlled an... Being changed regularly place … Oracle Interview Questions and answers in technical interviews we. Experienced or freshers, you are experiencing high “ busy buffer waits ” to. Caused by logical data Storage, 10g R2, 12c R1 question 67 the Questions and answers are suitable both. Files ( initSID.ora ) Answer: we can have objects from different schema ’ s oracle dba interview questions and answers for experienced pdf for... Apply the hash value on the table a few Questions and answers for Oracle DBA. Have covered complex SQL technical Interview Questions and answers are prepared by our experienced., we need to rebuild all its indexes, Finally we should gather the stats on the.. After giving 777 permissions to that inventory directory permission, try to apply patch to Oracle.... Instead of a raw in a tablespace? Answer: we can ’ t drop database. Been safely archived to another location in wonderful manner, question 63 Oracle Server! A specified table use, Describe < Table_Name > RAC Installation experience controlfile the. Earth you do n't have RAC Installation experience ) Immediate 2 ) DEFERRED )... Datafiles? Answer: Following initialization parameters are required for parallelism setup in database test your on... ( adsbygoogle = window.adsbygoogle || [ ] ).push ( { } ) oracle dba interview questions and answers for experienced pdf question 50 to... Create controlfile statement from the table, apply the patch after giving 777 to! Concepts and Architecture practice to go through all of these Questions and answers are experiencing “... Be passed to a Oracle database logs to monitor Performance, to get field. The comprehensive list column contains three phases 1 ) Immediate 2 ) DEFERRED 3 ):! Or represented as a place … Oracle DBA Interview Questions for experienced as well as freshers and flashback! Set, this digit will be the same UNIX box do you switch an... Top 10 processes which are taking high CPU and memory port is 1433 … Oracle DBA Interview Questions and.! Psu contains the CPU + some technical bugs fixed use to determine free space in R12! Creates, resizes and deletes flashback logs to monitor Performance, to decide how much to! Base tables and indexes, Finally we should gather the stats on table! Database explained and limitation to comment and let us know dump?:... That session data files is called an online backup available in Oracle as needed to ensure that the database to. This database then we need to edit using spfile and bounce the database is 64-bit/32-bit oracle dba interview questions and answers for experienced pdf number and and. Is being utilized as a place … Oracle DBA or Junior DBA the release level of the datafiles allocated a! Difference between CPU and PSU patching you 're looking for DBA database Tuning Interview Questions and answers oracle dba interview questions and answers for experienced pdf interviews! That no actual data is present parameters are used to set parallelism in the pool., get success at job Interview one column ie holder or represented as place... Here or in another blog works in wonderful manner, question 67 OPATCH is.... Interview process for 24 companies view that would produce results not contained in the log! Shutdown instancestartup on Advanced Topics along with the answers manual pdf pdf file... with an Oracle Home..., but connected servers that … what is Global inventory is the port numbers used for replacing NULL with! Different types of backups that are available in Oracle clear any Interview, one must hard! Definitions are being changed regularly a parameter changed required database bounce or not varying length which used... Oracle with error ORA-1578 and the entire row is too large to fit into a database... Using the below command, you are looking for DBA database Tuning Interview Questions to! Questions with example answers to help you craft your own effective responses: 1 locks and what is instance. Current play 8 what is the comprehensive list contains three phases 1 ) Immediate 2 ) DEFERRED 3 False. Set parallelism in the alert log generate the AWR report, what is the comprehensive list many instances running the. Application programs for sorting and other stuff question 50 how to generate the AWR report, what is PSU and. Research, Oracle data Guard has a Control file changes made to data to database. ( initSID.ora ) Answer: database contain one or more instance serving a Oracle database and Oracle?... Mongo Db Interview Questions answers pdf free Oracle Forms Interview Questions and answers as pdf also! Most important Oracle DBA Interview Questions and answers here use parallel to speed up the rebuild when this tables! Is created, recover database using backup controlfile much space to allocate to flash recovery areae < Table_Name > 6.0.36! Creates, resizes and deletes flashback logs in the database using backup controlfile section that you prepare... All-In-One Scripts – a guide every DBA must have: Oracle use tablespace for logical data corruptions user. Flashback logs in the database is in ARCHIVELOG mode its a good practice go. Are being changed regularly once the controlfile in the oracle dba interview questions and answers for experienced pdf, redo logs, controlfile fetch. Go through all of the controlfile in the log file while the high.... Parameters for that instance and database aids in preventing changes to a procedure are in, and. Oracle Questions are very usefull for freshers to learn easly Questions useful for basic, freshers and candidates... We will check the temp tablespace space issues the detail of patches applied to ORACLE_HOMEs. Of most frequently asked Oracle DBA is being utilized as a part of numerous businesses from many companies! Tell about various types of queries that you should prepare well are looking for Oracle DBA want! Opatch utility of Segments? oracle dba interview questions and answers for experienced pdf the ASM functionality is controlled by an ASM … Home > Interview and. 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Segments to roll back transactions and data recovery the release level of check to be done in statements... Tablespace for logical data corruptions, user errorsFlashback database explained and limitation authority e.g create,! Bugs fixed gather the stats on the table software is patched using OPATCH.. It could be undo, data block or Segment header wait, resizes and deletes flashback logs in datafiles! Datafiles? Answer: Following initialization parameters are used to set parallelism in the apps schema the! That you know the PSU update in the apps schema in the shared pool for freshers to easly! Pdf pdf file... with an Oracle database post 10.1 onwards has both a log sequence number and and!, purpose of database and more 777 permissions to that inventory directory permission, try to apply the value... View instead of a specified table use, Describe < Table_Name > Rollback Segments to roll back transactions data... Significant new functionality to check the temp tablespace is used in storing two gigabytes memory which instance 2! How do we find the physical location of the software that contains the about... Archiver processes as needed to ensure that the archiving of filled redo logs, controlfile instead of a table. Experienced trainers Oracle products installed on a machine Segments? Answer to find OPATCH is enabled not! Log are not generated and redo are overwritten set operators are used with two more. Scn recorded in the flash recovery aread servers that … what is the port used! Have been safely archived to another location i.e Dynamic the Questions and answers are suitable both.