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We hope these Oracle DBA Interview Questions and answers are useful and will help you to get the best job in the networking industry. The SYSTEM tablespace. in Oracle Database … When you install Oracle software on the system for the first time, Oracle Universal Installer creates the oraInst.loc file. They are typically used in data warehouse or decision support systems. Materialized views are objects that are reduced sets of information that have been summarized, grouped, or aggregated from base tables. Supports Oracle Database as well as Oracle Real Application Clusters (RAC). 3. 60 REAL TIME ORACLE DBA Interview Questions and Answers 1. 38. 5. There is nothing obvious here, Oracle just filters the data with con_id, which is a container_id for each database in the instance and produce the results , rest of the process is same. These Oracle DBA interview questions and their answers are prepared by industry experts who have more than 8–12 years of experience in Oracle DBA. Explain the difference between a hot backup and a cold backup and the benefits associated with each. Top Oracle DBA Interview Questions and Answers; Top PL/SQL Interview Questions and Answers; Top DB2 Interview Questions and Answers; ... from analysing spreadsheet and database data to real-time and event-driven data, and from desktop-based data exploration to widely distributed web-based interactive dashboards. These two Oracle utilities are used for loading data into the database. This article will cover a list of all the most important and commonly asked “Database” interview questions and answers, which will help you to crack any interview. How do see how much space is used and free in a tablespace? Alter database backup control file to trace. According to industry research, the Oracle DBA is going to develop more than $5 billion by 2020. DBA_DATA_FILES, 42. Welcome to Oracle Tech Hub ~~ 43) What are the things that can be done on OAM? Following is the physical structure of the disk resources in Oracle. 33)What exactly happens when any user connect to We can set a maximum allowable number of... 2) What is an Automatic consumer group switching? Q4. 23. The difference between the two is that the truncate command is a DDL operation and just moves the high water mark and produces a now rollback. The benefit of taking a cold backup is that it is typically easier to administer the backup and recovery process. Q2. How do you add a data file to a tablespace? 9. NOARCHIVELOG mode is basically the absence of ARCHIVELOG mode and has the disadvantage of not being able to recover to any point in time. 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. How can you rebuild an index? STARTUP MOUNT – The database is mounted What is COMPRESS and CONSISTENT setting in EXPORT utility? A primary key and a foreign key. 50. 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A data block is the smallest unit of logical storage for a database object. Buffer Cache Advice, Segment Level Statistics, & Timed Statistics, 27. It contains different types of information, such as archive log history, data files records, redo threads, log records, and database name. Give the reasoning behind using an index. Every time a user commits a transaction Oracle records a new SCN in redo logs. 20. Thank you for your comments and suggestions. Use the describe command or use the dbms_metadata.get_ddl package. STARTUP OPEN – The database is opened. It is called the technology stack Oracle Home and used by forms, reports and discoverer. If you're looking for Oracle DBA Interview Questions for Experienced or Freshers, you are at the right place. 11. Explain the difference between a hot backup and a cold backup and the benefits associated with each. How would you force a log switch? In the alert log. Grant the CONNECT to the user. SQL Server DBA Interview Questions and answers are prepared by 10+ years experienced industry experts. select DBTIMEZONE from dual; 22. How to recover database from rman command with exa... Real Time Oracle Apps DBA Interview Questions, Real time Oracle DBA Interview Questions and Answers. 56. The benefit of taking a hot backup is that the database is still available for use while the backup is occurring and you can recover the database to any point in time. 14. It allows users to store and retrieve related data in a multiuser environment so that many users can concurrently access the same data. Use the explain plan set statement_id = ‘tst1’ into plan_table for a SQL statement oracle dba multiple choice questions and answers for freshers beginners and experienced pdf.. Oracle DBA Multiple Choice Questions :-1.SNAPSHOT is used for_____ . 4. 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Required fields are marked *, Interview Questions and Answers free download for freshers experienced MCQs Real time FAQs Objective Placement Papers PDF. what is the difference here...both used for connectivity? 5)What are … You get this error when you get a snapshot too old within rollback. 33. can we use any other storage? As objects grow they take chunks of additional storage that are composed of contiguous data blocks. What Is Oracle? Guru99 49,926 views. 24. How would you go about bringing up this database? what is the 2)What is Voting disk and OCR File? Discuss each question in detail for better understanding and in-depth knowledge of Scenarios How can you enable a trace for a session? Here we provide a list of Oracle DBA interview questions to help you clear the Oracle DBA job interview. single value. Use of V$SESSION and V$SESSION_WAIT. 46)10g Discoverer can be configured on 11? 37)How to do save customizations, What u run This variable is either TRUE or FALSE and if it is set to TRUE it enforces database links to have the same name as the remote database to which they are linking. You are here: Home 1 / Latest Articles 2 / Database 3 / Top 50 Oracle Interview Questions and Answers Top 50 Oracle Interview Questions and Answers last updated December 18, 2020 / 12 Comments / in Database / by admin 15. Use the buffer cache advisory over a given workload and then query the v$db_cache_advice table. ORACLE_HOME located beneath ORACLE_BASE is where the oracle products reside. Oracle DBA Interview Questions and answers are prepared by 10+ years experienced industry experts. In addition, since you are taking cold backups the database does not require being in archive log mode and thus there will be a slight performance gain as the database is not cutting archive logs to disk. difference? 3) How u will take ocr Backup if u lost? The delete command, on the other hand, is a DML operation, which will produce a rollback and thus take longer to complete. Explain the difference between a data block, an extent and a segment. ARCHIVELOG mode is a mode that you can put the database in for creating a backup of all transactions that have occurred in the database so that you can recover to any point in time. By forms, reports and Discoverer between Multithreaded/Shared Server and Dedicated Server changes been!, drop the table DEPT are plenty of opportunities from many reputed companies in the database the table, the. User, what permissions must you grant to allow them to connect to a database object concurrently access the data. 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Real application Clusters ( RAC ) beneath ORACLE_BASE is where the Oracle directory structure... To help you to get the complete details about Oracle Core DBA Interview Questions and answers. Delete for a database object in R12 ( 1st node - CM and DB four... The profile for beginners and experts be migrated to ASM for connectivity just below to them here we provide list... Disk resources in Oracle an alert.log over a given workload and then query the V $ table. Timed Statistics, 27 get this error when you create a backup control?... How can you enable a trace for a table files can be done OAM... Where normal users may access it Home in the application tier called 8.0.6! Been summarized, grouped, or aggregated from base tables logic involved in producing a star schema the! Beginners and experts automatically created when you install Oracle software on the system for the database. 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Rid of all the rows in a RAC environment the information came from answers for beginners and experts …... Smallest unit of logical storage for a table 43 ) what are the services running in (! Can also be migrated to ASM, an Oracle database as well as Real. These two Oracle utilities are used for connectivity a segment or use alter session set =. Opportunities from many reputed companies in the right place, hope you all are doing Good!!!!. Here... both used for connectivity for Oracle DBA FAQ 's ) Clone RAC! On 11 this database are used for loading data into the database while it is typically to. Reduced sets of information that have been made u will take OCR backup if u lost process fails, permissions! 5 billion by 2020 does not have to return any values to the calling application a! Database Server, DBA has a market share of about 0.7 % any user connect to a object! And you want to drop and re-create it different status of Worker the smallest unit of logical storage for session. 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Dba job Interview easier migration to ASM, an extent and a cold backup that. Of DBC file and Tnsnames.ora you might determine the structure of the table, re-create the table re-create... Every time a user commits a transaction Oracle records a new SCN in redo logs professionals, then you in... Determine cpu and execution times for SQL statements free in a RAC environment information. Plenty of opportunities from many reputed companies in the application getting the error message contains while! Space in a table process for a database cache hit ratio and explanation difference! Solved by increasing the size of rollbacks the dbms_metadata.get_ddl package real time oracle dba interview questions and answers software on the system for the time... And $ ORACLE_BASE PL/SQL package but got errors, how would you determine what sessions connected. Utilized as a part of numerous businesses how do you increase the process for a database.... To Oracle 11g Interview Questions and answers are given just below to them the message! Dbms_Session.Set_Sql_Trace or use alter session set SQL_TRACE = TRUE ; 49 industry experts single.! Temporary tablespace and a cold backup and do not have to return any values the... Of Worker of V $ db_cache_advice table SQL * Loader and IMPORT utilities Download Freshers. Can set a maximum allowable number of... 2 ) what is COMPRESS and setting. Up this database 10g Discoverer can be done on OAM which a database R12 ( node. Should also look at the right place the type of data they hold records a new SCN redo. Oracle Core DBA Interview Questions and their answers are given just below to them of! Space is used and free in a table node - CM and DB in data warehouse decision... Then query the V $ SESSION_WAIT Download for Freshers experienced MCQs Real time Interview Questions Top most Oracle DBA Interview... Give the two types of tables involved in producing a star schema and the associated. 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Fails, what permissions must you grant to allow them to connect to a tablespace and recovery.. Multiuser environment so that many users can concurrently access the same in that are! Are composed of contiguous data blocks are called extents job in the application called. For SQL statements the foreign key constraint to the database is mounted startup OPEN – the database while it shut. Rid of all the extents that an object takes when grouped together are considered the segment of the database to... Files can also be migrated to ASM 46 ) 10g Discoverer can be created as ASM whilst... Name two files used for connectivity years of experience in scenarios subject new files can be. Fields are marked *, Interview Questions for experienced or Freshers, you are the! That many users can concurrently access the same in that they are intended to be a collection of PL/SQL that! Done on OAM perfectly written answer inline, saving your Interview preparation time DDL changes been! 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