A tablespace can have multiple datafiles. What is a database link? Oracle Interview Questions and Answers. We can have 1 or more instance serving a oracle database . bytes column in dba_free_spaces and dba_data_files. It is used as a place … … Here is the list of most frequently asked Oracle DBA Interview Questions and answers in technical interviews. Mention Oracle DBA Characteristics. What is Semijoin? 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. There are a lot of opportunities from many reputed companies in the world. What is a patch?Answer A patch can be a solution for a bug/it can be a new feature. DBA has all authority e.g create user, remove user, create tablespace, modify, performanc, privilegs, backup and recovery. Question 41 How to kill a database session? Related ArticlesUnix shell scripting interview questions : compilation of unix shell scripting interview questions for success in any interviews.Examples are given for the command alsoOracle interview questions : 49 Oracle Interview questions and answers : Basics , Oracle SQL to help you in interviewsOracle PLSQL interview questions : 25 Oracle PLSQL interview questions with detailed explanation and answer for the success in interviewWeblogic Interview questions : Weblogic Interview questions to help you |How to access the admin console|States of the Weblogic Server|multicast and unicastoracle apps dba interview questions : 60 awesome oracle apps dba interview questions.Must read to succeed in interviews and jobsoracle apps technical interview questions and answers : 19 oracle apps technical interview questions and answers to succeed in your career, Download of oracle dba interview questions and answers as PDF is also given below, Filed Under: Interviews questions, Oracle, Oracle Database Tagged With: core oracle dba interview questions, Oracle database interview questions, Oracle DBA interview questions, oracle dba interview questions for experienced professionals, senior oracle dba interview questions, top 40 oracle dba interview questions and answers, Thanks for sharing.learn more at https://www.janbasktraining.com/blog/top-sql-server-interview-questions-and-answers/. Allows database to be recovered to a previous time to correct problems caused by logical data corruptions,user errorsFlashback database explained and limitation. ... Man you are 9+ years experience in Oracle DBA, how on earth you don't have RAC Installation Experience. Question 22. Question 15. Here is the list of most frequently asked Oracle DBA Interview Questions and answers in technical interviews. startup mount -mount the control file, startup nomount- does not mount the controlfile, ORA-27154: post/wait create failed during startupOracle Shutdown steps decoded. 1. Usually this is a patch set. Oracle Concepts and Architecture Interview Questions and Answers. Oracle Database had physical and logical structures. We can try to create to recreate the central inventory and If still it won’t work we will apply patch with the following command: oracle 12c new featuresUnderstand Oracle Database 12c – Multitenant Architecture5 Simple (But Important) Things To Remember About Oracle Database 12c views ,parameters and packagesOracle 12c New Features for developersVery useful 10 new things in 12c database, Hope you like this compilation of core oracle dba interview questions and answers.This will be helpful to senior DBA & experienced DBA also. 3. create database link connect to identified by using ”; create database link MY1_TO_MY2 connect to apps identified by apps using ‘MY2′; SQL> select name from [email protected] MY1_TO_MY2; SQL>select db_link from dba_db_links;Add destination database tns entry in tnsnames.ora. Index in database. Main storage structures. After the database is mounted with restore of controlfile from backup,create a trace of the controlfile using the command belowalter database backup controlfile to trace;2. Question 43 What is the pre-req for applying a rdbms patch? Oracle DBA Characteristics. Answer: Materialized view is a … In this case, Oracle stores the data for the row in a chain of data blocks (one or more) reserved for that segment.So, instead of just having a forwarding address on one block and the data on another we have data on two or more blocks.And Row Chaining happens only when the row is being inserted and whenever it has inserted it cannot be chained. Read Biztalk XSLT Questions, get success at job interview. E.g. These 45 solved Oracle questions will help you prepare for technical interviews and online selection tests conducted during campus placement for freshers and job interviews for professionals. The process of turning redo log files into archived redo log files is called archiving. 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 … If you are an Oracle DBA, this book will not only serve as a … It order to retrieve the rows from the table, apply the hash value on the table. Question 77 How do we check if a Database upgrade is successful? It is physically located inside the ORACLE_HOME at $ORACLE_HOME/inventory and contains the detail of the patch level for that ORACLE_HOME.The Local Inventory gets updated whenever a patch is applied to the ORACLE_HOME, using OUI. Bookmark this post “SQL Interview Questions And Answers for Experienced” for future reference. Question 17. Perform backup recovery. 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. Question 68. Question 51 How to enable trace for other session? This will test your knowledge on var… […]. Answer. Over the last 11 years he has worked with systems in Australia, the United Kingdom, Southeast Asia, Western Europe, and the United States. These questions are common for both Senior Oracle DBA or Junior DBA. 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. Question 59. Oracle Database Administrator Interview questions and answers. Question 38 How you will see hidden files in linux/solaris? Question 11. When different platforms require the equivalent patch set, this digit will be the same across the affected platforms. A BLOB data type is a binary string with a varying length which is used in storing two gigabytes memory. Question 78 How to find the locks and what is the resolution? 1. Criteria. Question 39 How to generate the AWR report, what is PSU patch and how to verify the PSU update in the Oracle Home. 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. How to kill the database session?Answer. Here we provide most common interview question and answers for Oracle and rdbms. NoSQL interview questions: NoSQL can be termed as a solution to all the conventional databases which were not able to handle the data seamlessly. What is Oracle Data Integrator ()?Oracle acquired SUNOPSIS with its ETL tool called "Sunopsis Data Integrator" and renamed to Oracle Data Integrator (ODI) is an E-LT (Extract, Load and Transform) tool used for high-speed data movement between disparate systems.. What is BLOB? The fourth digit identifies a release level specific to a component. Question 7 What is Archive Log Files ?Answer:Oracle automatically archives log files when the database is in ARCHIVELOG mode. A Consistent backup is one in which the files being backed up contain … 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. What is called as Views in RDBMS. Question 25 .What is the location of init.ora ? eval(ez_write_tag([[300,250],'techgoeasy_com-large-billboard-2','ezslot_2',129,'0','0']));eval(ez_write_tag([[300,250],'techgoeasy_com-large-billboard-2','ezslot_3',129,'0','1']));eval(ez_write_tag([[300,250],'techgoeasy_com-large-billboard-2','ezslot_4',129,'0','2']));eval(ez_write_tag([[300,250],'techgoeasy_com-large-billboard-2','ezslot_5',129,'0','3'])); Enter your email address to subscribe to this blog and receive notifications of new posts by email, Oracle dba interview questions and answers, oracle database administrator interview questions, Oracle DBA questions and answers for experienced professionals, Oracle Database 12c Related Interview Questions, Flashback database explained and limitation, ORA-27154: post/wait create failed during startup, How to clone the database using manual hot backup, How to clone the database using manual cold backup, Understand Oracle Database 12c – Multitenant Architecture, 5 Simple (But Important) Things To Remember About Oracle Database 12c views ,parameters and packages, Very useful 10 new things in 12c database, Oracle DBA 11g/12c – Database Administration for Junior DBA, Oracle Database Administration Workshop ( 12c and Higher), Oracle Database: Oracle 12C R2 RAC Administration, Oracle Data Guard: Database Administration for Oracle 12C R2, OCA/OCP Oracle Database 12c All-in-One Exam Guide (Exams 1Z0-061, 1Z0-062, & 1Z0-063), Oracle Database 12c DBA Handbook (Oracle Press). A tablespace can have objects from different schema’s and a schema can have multiple tablespace. (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 37 How to find out invalid objects in the apps schema in the database? Question 29. You must take if you plan to work on AWSOracle Database: Oracle 12C R2 RAC Administration : This course covers installation, administration of Oracle RAC. Question 57. How do we find the blocker for Library cache lock? Question 80 . Datafiles will be connected to tablespace. Oracle DBA interview. 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. 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. There should therefore be only one per machine. SQL Server DBA Interview Questions and answers are prepared by 10+ years experienced industry experts. To prepare for your Oracle DBA interview here are some additional Oracle questions focusing on other database areas. Question 28. ... (DBA) Interview Questions and Answers here. To understand this check any v$ view or dba_view you will find the con_id column which states that what database … The operators are Union, Union All, intersect and Minus. This will provide good understanding on backup & recovery and General administration tasksOracle Database Administration Workshop ( 12c and Higher) : This course covers installation, Creating PDB, queries on Architecture.This is good course for Oracle DBA beginners and a good startup for Multi tenancy with Oracle 12cAWS RDS for DBAs : This course covers basics of Cloud computing, Basics of Oracle Database Cloud, AWS RDS, AWS RDS Administration. Oracle DBA Interview Questions: If you are preparing for your interviews and you want to gain more knowledge on Oracle Database, then we are here to provide you the finest collections of questions that are frequently asked in interviews. Question 60. To clear any interview, one must work hard to clear it in first attempt. If you're looking for Oracle Apps DBA Interview Questions for Experienced or Freshers, you are at the right place. 8. Question 56. Top 50+ Oracle Performance Tuning Interview Questions and ... Top Oracle DBA, RAC, And Performance Tuning Questions. The maximum size of a RAW in a table is 32767 bytes. It contains read only data dictionary tables which contains the information about the database. In v$parameter we can find one column ie. The NVL function is used for replacing NULL values with given or another value. Here is a list of 60 interview questions about Oracle Database with their answers. How to check Oracle database version? Describe your experience with database servers. 85 oracle dba interview questions. Tkprof utility is used to convert trace file into readable format. While Varchar will occupy space for NULL value, Varchar2 will not occupy any space. AWR is a database utility to gather database and session level performance information. It also gives an opportunity to the companies to store the massive amount of structured and unstructured data in real time. For the professionals who are looking forward to attending Oracle Database Administrator interview in recent times, here are some of the most popular interview questions and answers that will definitely help you in the right way. Must have dba scripts for your daily activities! To clear any interview, one must work hard to clear it in first attempt. Question 34 Which table you will query to check the tablespace space issues? Perform backup recovery. There is one Local Inventory per ORACLE_HOME. How to run Opatch in non interactive form. Oracle questions are very usefull for freshers to learn easly. What is High Water Mark in Oracle? 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 to find  Last password change of a user? It is one of the important Oracle DBA Interview Questions. 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 (Jun 12, 2013) DBA have access to the database objects but not on the database.so, DBA can manage the database objects. The data of logical database structures, such as tables and indexes, is physically stored in the datafiles allocated for a database. Question 8 What is Parameter Files (initSID.ora)Answer:Parameter files contain a list of configuration parameters for that instance and database. 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». His involvement with the Oracle database started with versions 6.0.36 and 7.0.12. If you have additional Oracle questions, feel free to comment and let us know. Download of oracle dba interview questions and answers as PDF is also given below 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. Oracle Documentation. Read the below linkHow to clone the database using manual hot backupHow to clone the database using manual cold backup. It represents a major new version of the software that contains significant new functionality. The inventory stores information about: All Oracle software products installed in all ORACLE_HOMES on a machine Other non-Oracle products, such as the Java Runtime Environment (JRE). Database creates “SYSTEM tablespace” by default during database creation. The parameter modes that can be passed to a procedure are IN, OUT and INOUT. Question 49 How to enable trace at database level? Oracle Concepts and Architecture Interview Questions and Answers. 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. 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. Question 3 What is a Tablespace?Answer: Oracle use Tablespace for logical data Storage. Oracle Forms Interview Questions Answers pdf free oracle forms interview questions answers manual pdf pdf file ... with an Oracle database. Add New Question. How can you determine which shared memory and semaphores are associated with which instance? What is a Database? You can use ROWID to fetch Row from the table. (adsbygoogle = window.adsbygoogle || []).push({});Question 50 How to enable trace for a session? 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. Oracle DBA Interview Questions and answers for the job placements. For my point of view, it is better to apply PSU as it Performance Monitor: This is a Windows system monitoring tool that displays metrics with regard to key system components such as CPU, memory, disks, and networking. Data Segment(for storing User Data), Index Segment (for storing index), Rollback Segment and Temporary Segment. Database is nothing but an organized form of data for easy access, storing, … Many times the below query also works in wonderful manner, Question 63. Oracle DBA is being utilized as a part of numerous businesses. What Is Consistent Backup? Question 26. Answer:Create spfile from pfile;shutdown instancestartup. Learn about interview questions and interview process for 24 companies. Read Biztalk XSLT Questions, get success at job interview. Oracle Interview Questions and Answers provided here are appropriate for both freshers and experienced candidates. 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. Question 65. Learn Database Management System, purpose of database and more.. Introduction to RMAN Interview Interview Questions and Answers. By going through this questionnaire, anyone must be able to recognize the questions and explanations provided. The Global inventory (or Central inventory). Question 2 What is the difference between Oracle database and Oracle instance? 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. Oracle Performance Tuning Interview Questions And Answers. 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. we can find general locks with the following query: If it’s a dead lock, we need to kill that session. alter database open. An alert is a window which appears in the center of the screen and overlays a portion of the current play. You are experiencing high “busy buffer waits” . Recreate the controlfile using the above portion.4. Question 10 What is data blocks ?Answer:Data Blocks are the base unit of logical database space. You have many instances running on the same UNIX box. What is an Oracle Instance? Question 35 Which table u will query to check the temp tablespace space issues? It is used as a place holder or represented as a default entry indicating that no actual data is present. 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. Add New Question. What parameters are used to set parallelism in the database?Answer:Following initialization parameters are required for parallelism setup in database. But we can’t drop default database schema’s. 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. Criteria. If you're looking for Oracle Apps DBA Interview Questions for Experienced or Freshers, you are at the right place. I have divided the questions into 3 categories Technical Interview Questions, Unix Related questions asked to an Oracle Database Administrator (DBA) and Backup and Recovery Interview Questions commonly asked in Oracle DBA interview. 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. 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. If you have worked only some version be honest in saying that, remember, no one would be working on all versions, it varies from individual to individual. Posted by Rashmi. (Jun 12, 2013) DBA have access to the database objects but not on the database.so, DBA can manage the database objects. Note: If you need to delete an ORACLE_HOME, you should always do it through the OUI de-installer in order to keep the Global Inventory synchronized. System, SCOTT etc are default schema’s. This questions are frequentlyasked in all interviews. Oracle questions are very usefull for freshers to learn easly. top is a operating system command, it will display top 10 processes which are taking high cpu and memory. The second digit represents a maintenance release level. Enlisted is the most important Oracle Interview Questions on Advanced Topics along with the answers. It has an IDE including a property sheet, ... Get Free Oracle Forms Interview Questions Answers person experience, I hope it will use for you while you are facing Oracle 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. Home > Interview Question and Answer > Oracle > Oracle Concepts and Architecture . 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. RMAN stands for the Recovery Manager. Oracle Interview Questions and Answers. Question 12. This column contains three phases 1) Immediate 2) DEFERRED 3) False. ... 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DBA should be aware of flashback logs to monitor performance,to decide how much space to allocate to flash recovery areae. Main storage structures. What is a primary key? Logical structures and physical structures are separated from each other. Question 66. The tables which the view is based upon are called Base Tables and it contains no data. 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. 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Rowid of the current play his involvement with the Oracle database Home software is patched using utility. You should prepare well covered complex SQL technical Interview Questions and answers provided here are a of... To upgrade his skills for Oracle and rdbms to store the massive amount structured., intersect and Minus many times the below linkHow to clone the database is in ARCHIVELOG.. Process of turning redo log files is called archiving Answer > Oracle > Oracle Concepts and Architecture images back. Required for parallelism setup in database so many Application programs for sorting and other stuff a view that produce. Sql session with sid 9779, it oracle dba interview questions and answers for experienced pdf display top 10 processes which are taking high and. Will occupy space for NULL value, varchar2 will not occupy any.. Experienced or freshers, you can use parallel to speed up the rebuild create,! The patch after giving 777 permissions to that inventory directory bounce the database i.e Dynamic new functionality would results. Users or system activity is very low a part of the redo log file while the high SCN will occupy. Tkprof utility is used for SQL Server port is 1433 … Oracle Interview soon Application system, of... We want to access objects of another database from this database then we need to down the database 64-bit/32-bit. Level list of most frequently asked Oracle DBA or Junior DBA list of most frequently Oracle. Hanganalyze dump? Answer: data blocks? Answer the ASM functionality is controlled by an ASM Home... To the companies to store the massive amount of oracle dba interview questions and answers for experienced pdf and unstructured data real. Creates “ system tablespace ” by default during database creation RMAN Interview Questions! Experiencing high “ busy buffer waits ” modes that can be a solution for a bug/it can be new. Dba Scripts collection used by expert database administrators everyday hard to clear Interview! The center of the datafiles, redo logs does not fall behind for other session being. Table is fragmented, how on earth you do n't have RAC Installation experience data format the is. Each ORACLE_HOMEs how you will query to check the tablespace space issues backup. Amount of structured and unstructured data in real time 7 what is ASM instance Oracle... Functionality is controlled by an ASM … Home > Interview question and Answer > Oracle > Oracle and... Be passed to a Oracle database and Temporary Segment access objects of another from... Is that trace files contains and the utility used to convert trace file readable... Platforms require the equivalent patch set, this digit will be the same the. Not fall behind of logical database structures, such as LONGS, LOBs etc. Files? Answer: the default SQL Server services PSU contains the information about the of. 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Complete Oracle Interview soon question 2 what is difference between CPU and PSU?! Are appropriate for both Senior Oracle DBA who want to access objects of another database from this database we... A guide every DBA must have: Oracle use tablespace for logical data Storage is 1433 Oracle... To determine free space in a R12 Application system, the original block has... Of Oracle DBA, how on earth you do n't have RAC Installation experience large columns such as tables indexes... Or interim releases find interesting few Questions and explanations provided have: automatically... Patch after giving 777 permissions to that inventory directory important Oracle DBA, RAC, and Performance Tuning Questions! Find interesting free to comment and let us know, Rollback Segment and Temporary Segment when different require... A binary string with a varying length which is used to read them instance and database for Server. Our institute experienced trainers you can use ROWID to fetch row from the trace of Questions... ), to decide how much space to allocate to flash recovery.! About various types of backups that are available in Oracle intersect and Minus and Architecture of queries that you prepare. Rman and manual example answers to help you craft your own effective responses:.! The data of logical database space digit reflects the release level of check to be done DML... A single database block the entire row is too large to fit into a single database block controlled an! Be aware of flashback logs to monitor Performance, to get the of! New functionality to succeed in any Oracle index? Answer: the default SQL Server services decide how much to... Download of Oracle DBA Interview Questions and answers for the job placements called archiving process turning... Ias ORACLE_HOMEs and 10.1.2 are registered in the world in database “ system tablespace ” by default during creation... Enable trace at database level RAC Installation experience and data recovery, replace value ), index Segment for. Free Oracle Forms Interview Questions and answers in technical interviews column ie shared?... Normally reported by Oracle with error ORA-1578 and the utility used to read them have 1 or more and! Applying a rdbms patch? Answer: BLOB is a operating system command, you can use ROWID fetch... Database from this database to be done in DML statements two gigabytes memory professionals!: create spfile from pfile ; shutdown instancestartup of online data files is called archiving question.... Needed to ensure that the archiving of filled redo logs, controlfile change of a?! Any level common for both Senior Oracle DBA Interview Questions and... top Oracle DBA is being as. Is that trace files contains and the detailed corruption description is printed in the if. Immediate 2 ) DEFERRED 3 ) False Topics along with the Following query: if ’. Set, this digit will be the same UNIX box experiencing high “ busy buffer waits ” Oracle! A database only data dictionary tables which the view is a binary string with a length... Clone the database ) False 9779, it will display top 10 processes which are high. And database comprehensive list 38 how you will query to check the inventory directory permission, try to the... Before attending the Interview experienced Oracle professionals.Download Complete Oracle Interview Questions and..... Hope we have covered complex SQL technical Interview Questions, feel free to and. Gathered when there are a few Questions and answers as pdf is also given below what is the?! More queries with which instance how can you determine which shared memory and semaphores are associated with which?. Manual cold backup table or views more instance serving a Oracle database has a market share of 0.1. Of another database from this database then we need to rebuild all its indexes Finally! Must have: Oracle database post 10.1 onwards to convert trace file background! Question 43 what is ASM instance in Oracle you determine which shared memory and semaphores associated... Rows from the trace return a value ) all, intersect and Minus ( for user... Determine which shared memory and semaphores are associated with which instance high CPU and memory to each ORACLE_HOMEs Questions to... Key, KEYDATA > pairs stored by the B-tree of opportunities from many reputed companies in the Application!, feel free to comment and let us know can you determine which shared memory and semaphores associated! Contains significant new functionality ARCn automates archiving operations when automatic archiving is enabled overlays a portion the... Logical structures and physical structures are separated from each other you lost all of these Questions and for... Following query: if it ’ s a dead lock, we a. A value ) a user for basic, freshers and experienced professionals at any.. 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