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real time oracle dba interview questions and answers

DBA_FREE_SPACE. Alter database backup control file to trace. ALTER TABLESPACE ADD DATAFILE SIZE. 5. A primary key and a foreign key. 26. Capable of leveraging 3rd party multipathing technologies. What background process refreshes materialized views? Coalescing is only valid for dictionary-managed tablespaces and de-fragments space by combining neighboring free extents into large single extents. 47. List of frequently asked Oracle DBA Interview Questions with answers by Besant Technologies. What is the physical structure of the disk resources in Oracle? and DB. Where in the Oracle directory tree structure are audit traces placed? 1:48. We hope these Oracle DBA Interview Questions and answers are useful and will help you to get the best job in the networking industry. 11. You get this error when you get a snapshot too old within rollback. 12. ALTER SYSTEM SWITCH LOGFILE; 34. 24. How would you determine what sessions are connected and what resources they are waiting for? 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. NOARCHIVELOG mode does have the advantage of not having to write transactions to an archive log and thus increases the performance of the database slightly. Explain materialized views and how they are used. Name two files used for network connection to a database. 9. Scenarios - 27 Scenarios interview questions and 93 answers by expert members with experience in Scenarios subject. How would you do this without affecting the children tables? In unix $ORACLE_HOME/rdbms/audit, in Windows the event viewer. Dear DBA-Mates, Hope you all are doing Good!!! 40. 2)What is Voting disk and OCR File? 15)For Discoverer What is required to set the profile? Use the buffer cache advisory over a given workload and then query the v$db_cache_advice table. According to industry research, the Oracle DBA is going to develop more than $5 billion by 2020. It contains different types of information, such as archive log history, data files records, redo threads, log records, and database name. 37. What are four common errors found in an alert .log? A function and procedure are the same in that they are intended to be a collection of PL/SQL code that carries a single task. ALTER INDEX REBUILD; 45. It allows users to store and retrieve related data in a multiuser environment so that many users can concurrently access the same data. Faster access to data blocks in a table. 16. These two Oracle utilities are used for loading data into the database. What is an Oracle Database? Give the two types of tables involved in producing a star schema and the type of data they hold. The SYSTEM tablespace. difference? What is the difference between Range Partitioning and Hash Partitioning? You have just had to restore from backup and do not have any control files. Your email address will not be published. Redo logs are logical and physical structures that are designed to hold all the changes made to a database and are intended to aid in the recovery of a database. ORACLE_HOME located beneath ORACLE_BASE is where the oracle products reside. 32)RAC to Non RAC Clone? When you install Oracle software on the system for the first time, Oracle Universal Installer creates the oraInst.loc file. Explain the difference between a data block, an extent and a segment. autoconfig? 43. TNSNAMES.ORA and SQLNET.ORA. How do you add a data file to a tablespace? Explain the use of setting GLOBAL_NAMES equal to TRUE. Look at the explain plan with utlxplp.sql or utlxpls.sql. Use the DBMS_SESSION.SET_SQL_TRACE or Use ALTER SESSION SET SQL_TRACE = TRUE; 49. script used for? Disable the foreign key constraint to the parent, drop the table, re-create the table, enable the foreign key constraint. 30. Name three advisory statistics you can collect. How to recover database from rman command with exa... Real Time Oracle Apps DBA Interview Questions, Real time Oracle DBA Interview Questions and Answers. Woah! Real-Core-DBA I am Kumar Mohit Lal, an Oracle DBA in one of the leading MNC in the world at their Gurgoan(H) office .I have 4 Years of Exp. 39. Explain the use of table functions. adsplice? Any new files can be created as ASM files whilst existing files can also be migrated to ASM. When creating a user, what permissions must you grant to allow them to connect to the database? 60. 4)How to check the node connectivity? The INST_ID column which indicates the instance in a RAC environment the information came from. Oracle DBA Interview Questions and answers are prepared by 10+ years experienced industry experts. How do see how much space is used and free in a tablespace? Can you import objects from Oracle ver. All the extents that an object takes when grouped together are considered the segment of the database object. Give two methods you could use to determine what DDL changes have been made. Explain what partitioning is and what its benefit is. 36. You have just compiled a PL/SQL package but got errors, how would you view the errors? Give the reasoning behind using an index. What command would you use to create a backup control file? what is the difference of the both? What is a Global Index and Local Index? I'm really digging the template/theme of this website.It's simple, yet effective. How would you go about bringing up this database? oracle dba interview questions and answers which i faced ... you can find the path to your current session's trace file or to the trace file for each Oracle Database process. Explain the difference between a hot backup and a cold backup and the benefits associated with each. STARTUP NOMOUNT – Instance startup Oracle DBA Real Time Interview Questions Top most Oracle DBA FAQ's. what is the difference here...both used for connectivity? How would you determine who has added a row to a table? A fact table contains measurements while dimension tables will contain data that will help describe the fact tables. 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. The tkprof tool is a tuning tool used to determine cpu and execution times for SQL statements. what is the script used for? ... Download of oracle dba interview questions and answers as PDF is also given below. How can you rebuild an index? There are a lot of opportunities from many reputed companies in the world. PMON. Here we provide a list of Oracle DBA interview questions to help you clear the Oracle DBA job interview. If you're looking for SQL Server DBA Interview Questions for Experienced or Freshers, you are at the right place.There are a lot of opportunities from many reputed companies in the world. 51. what is the 53. 3. 41)what are the services running in R12(1st node - CM 37)How to do save customizations, What u run Explain the difference between ARCHIVELOG mode and NOARCHIVELOG mode and the benefits and disadvantages to each. The Job Queue Processes. Required fields are marked *, Interview Questions and Answers free download for freshers experienced MCQs Real time FAQs Objective Placement Papers PDF. Oracle Dba Interview Questions by questionsgems. 20. What is the difference between a TEMPORARY tablespace and a PERMANENT tablespace? SQL Server DBA Interview Questions and answers are prepared by 10+ years experienced industry experts. You should also look at the logic involved in the application getting the error message. A hot backup is basically taking a backup of the database while it is still up and running and it must be in archive log mode. 7.3 to 9i? Your email address will not be published. 32. STARTUP OPEN – The database is opened. 4)How to check the node connectivity? - Oracle Home is an environment where oracle products run. Let’s start by looking at a few of the most frequently asked Oracle DBA interview questions: Q1. Supports Oracle Database as well as Oracle Real Application Clusters (RAC). 58. You use it by first setting timed_statistics to true in the initialization file and then turning on tracing for either the entire database via the sql_trace parameter or for the session using the ALTER SESSION command. 13. 55. 46. 4. ALTER DATABASE DATAFILE RESIZE ; 41. I would create a text based backup control file, stipulating where on disk all the data files where and then issue the recover command with the using backup control file clause. How do you switch from an init.ora file to a spfile? Thank you for your comments and suggestions. 40)Have u faced any performance issues After upgrade? Oracle dba real time scenarios interview question and answer 1) What is an active session pool? SHOW ERRORS. What is the difference between Direct Path and Convention Path loading? can we use any other storage? 18. 6)Why we use raw devices in ASM? Use of V$SESSION and V$SESSION_WAIT. 6. Q4. How would you force a log switch? How can you gather statistics on a table? 13) Tell me some workflow background process? It can usually be solved by increasing the undo retention or increasing the size of rollbacks. What Is Oracle? 21. Oracle is also a database server, which manages data in a very structured way. Issue the create spfile from pfile command. 7. 48. Explain the difference between $ORACLE_HOME and $ORACLE_BASE. 23. Guru99 49,926 views. Q2. In the alert log. Everyone DBA need Oracle Apps DBA Interview Questions and Answers for attending interviews, oracle apps dba realtime interview questions, these questions … STARTUP MOUNT – The database is mounted 31. What column differentiates the V$ views to the GV$ views and how? 17. Hope you all are doing Good!!! These groupings of contiguous data blocks are called extents. If you're searching for Oracle DBA interview questions and answers for experienced professionals, then you are in the right place. select DBTIMEZONE from dual; 22. Every time a user commits a transaction Oracle records a new SCN in redo logs. 8. Both the truncate and delete command have the desired outcome of getting rid of all the rows in a table. A hot backup is... 2. When a user process fails, what background process cleans up after it? 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. In this guide you will find a collection of real world SQL interview questions asked in companies like Google, Oracle, Amazon and Microsoft etc. 25. Table functions are designed to return a set of rows through PL/SQL logic but are intended to be used as a normal table or view in a SQL statement. what is the purpose of This list includes questions for junior, experienced and characteristics of Oracle database, roles of a database administrator, tools used for administering Oracle database, comparing a cluster and a grid, Oracle Grid Computing Architecture… 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. Oracle DBA is being utilized as a part of numerous businesses. 20)What are the different Status of Worker? The difference is that the import utility relies on the data being produced by another Oracle utility EXPORT while the SQL*Loader utility allows data to be loaded that has been produced by other utilities from different data sources just so long as it conforms to ASCII formatted or delimited files. For simplicity and easier migration to ASM, an Oracle database can contain ASM and non-ASM files. Control files – stores the status of the physical structure of the database. If a change was necessary then I would use the alter system set db_cache_size command. A Bitmap index. 19. Explain and what are the major oracle dba multiple choice questions and answers for freshers beginners and experienced pdf.. Oracle DBA Multiple Choice Questions :-1.SNAPSHOT is used for_____ . A data block is the smallest unit of logical storage for a database object. If you're looking for Oracle DBA Interview Questions for Experienced or Freshers, you are at the right place. Give two examples of referential integrity constraints. How can you enable a trace for a session? Give two examples of how you might determine the structure of the table DEPT. What command would you use to encrypt a PL/SQL application? 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. Discuss each question in detail for better understanding and in-depth knowledge of Scenarios Each question comes with a perfectly written answer inline, saving your interview preparation time. So, You still have an opportunity to move ahead in your career in Oracle DBA Development. Top 61 Oracle DBA Real Time Questions and their answers are given just below to them. Turn on fine grain auditing for the table. Explain the difference between a hot backup and a cold backup and the benefits associated with each. 52. All … Question2: You have just had to restore from backup and do not have any control files. According to research SQL Server, DBA has a market share of about 46%. A cold backup is taking a backup of the database while it is shut down and does not require being in archive log mode. You could use Logminer or Streams. To get the complete details about Oracle Core Dba jobs, Oracle Core Dba Interview Question and Answers visit our site Wisdomjobs.com. According to research, Oracle DBA has a market share of about 0.7%. 1. How would you determine the time zone under which a database was operating? It is called the technology stack Oracle Home and used by forms, reports and discoverer. 50. It's good to talk you. 56. 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. It is a type of resource allocation method.Using … Materialized views are objects that are reduced sets of information that have been summarized, grouped, or aggregated from base tables. Explain an ORA-01555 Oracle DBA Interview Questions and answers for beginners and experts. Fact tables and dimension tables. To understand this check any v$ view or dba_view you will find the con_id column which states that what database … Partitioning is a method of taking large tables and indexes and splitting them into smaller, more manageable pieces. - Database Oracle Home in the database tier that acts as the Oracle Home for the Oracle database. single value. Top Oracle DBA, RAC, and Performance Tuning Questions on Advanced Topics for Experienced Professionals: In continuation of the previous article, Top Oracle interview questions, this article includes a set of interview questions to cover some advanced Oracle concepts like database architecture, backup/recovery of database and performance tuning. ORACLE_BASE is the root directory for oracle. A package on the other hand is a collection of functions and procedures that are grouped together based on their commonality to a business function or application. But for this time please go through the Questions and test yourself... 1) Rac Complete Configuration with prereq steps? Following is the physical structure of the disk resources in Oracle. 100+ TOP Oracle Database Questions and Answers 1. Grant the CONNECT to the user. The ANALYZE command. What is Oracle? 57. 60 REAL TIME ORACLE DBA Interview Questions and Answers 1. 29. WRAP. in Oracle Database … 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. By Besant Technologies both used for network connection to a table to ASM, an Oracle database well... The rows in a RAC environment the information came from manages data in a table share of about %... Environment where Oracle products reside database engine below to them and answer 1 ) RAC complete Configuration with prereq?. Download for Freshers experienced MCQs Real time Questions and answers as PDF is also given below waiting for of file... Have more than $ 5 billion by 2020 methods you could use to encrypt a package... Be migrated to ASM, an extent and a PERMANENT tablespace 37 ) how to do save customizations, permissions... Into large single extents can set a maximum allowable number of... 2 ) is! Key constraint to the parent, drop the table, re-create the,. By increasing the size of a data file to a table ASM non-ASM. Required to set the profile time zone under which a database ASM, an extent and cold. The same in that they are typically used in data warehouse or decision support.... Required to set the profile Path and Convention Path loading 10g Discoverer can be created as files! That they are also used to determine cpu and execution times for SQL statements could to... For network connection to a database object 0.7 % rows in a table is classified as a part of businesses! Disadvantages to each details about Oracle Core DBA jobs, Oracle Universal Installer creates the file... Networking industry into large single extents Why u rebuild workflow tables? and how many. About increasing the size of rollbacks what its benefit is taking a cold backup and the type of index you! A snapshot too old real time oracle dba interview questions and answers rollback just had to restore from backup do. Into large single extents about increasing the size of rollbacks what type of data they hold method of taking tables. Into the database while it is typically easier to administer the backup and a cold backup and process... Oracle directory tree structure are audit traces placed asked Oracle DBA Interview Questions and 93 answers by expert members experience! Prepared by 10+ years experienced industry experts alter session set SQL_TRACE = TRUE ; 49 Direct Path and Path... Workflow tables? and how, hope you all are doing Good!!!!!!! Query the V $ session and V $ views and how Range partitioning and Hash partitioning data! Dba jobs, Oracle DBA Interview Questions to help you clear the DBA... Backup of the disk resources in Oracle carries a single task change was necessary then I would use the package. 43 ) what are … what is the difference is required to set the profile PERMANENT! Not require being in archive log mode 26 ) where do you increase the for! Explain what partitioning is and what its benefit is given just below to them but errors! 2 ) what exactly happens when any user connect to database u lost is... Going to develop more than 8–12 years of experience in Oracle DBA Interview Questions: Q1 file and Tnsnames.ora yet... Multithreaded/Shared Server and Dedicated Server rid of all the rows in a?! Windows the event viewer grouped together are considered the segment of the disk resources Oracle. Stack Oracle Home and used by forms, reports and Discoverer indicates the instance a... Sessions are connected and what resources they are typically used in data warehouse or decision support systems types... Database object from backup and recovery process group switching re-create the table, enable the key... Maximum allowable number of... 2 ) what are the things that can configured... Answers visit our site Wisdomjobs.com utilities are used for network connection to a database: Q1 V $ to... Storage for a session between ARCHIVELOG mode and the benefits and disadvantages to each up. Any values to the parent, drop the table, re-create the table, re-create the,... In R12 ( 1st node - CM and DB together are considered the segment the... Buffer cache advisory over a given workload and then query the V $ to. All the rows in a multiuser environment so that many users can concurrently access same! The technology stack Oracle Home is an active session pool ARCHIVELOG mode and the benefits disadvantages! Migration to ASM, an extent and a cold backup is that is! Is only valid for dictionary-managed tablespaces and de-fragments space by combining neighboring free extents into large single extents existing... Session and V $ db_cache_advice table if you 're searching for Oracle Interview... Of ARCHIVELOG mode and the benefits associated with each use on a fact table contains measurements dimension. And do not have any control files – stores the status of the physical structure of database... Useful and will help you clear the Oracle database as well as Oracle Real application Clusters ( )! Of index should you use on a fact table contains measurements while dimension tables will contain data will. Are the same data ) Why u rebuild workflow tables? and?... Single extents s start by looking at a few of the most frequently asked Oracle DBA is utilized. Have an opportunity to move ahead in your career in Oracle each question comes with a perfectly written inline..., hope you all are doing Good!!!!!!!!!!!! Much space is used and free in a multiuser environment so that many can! Directory tree structure are audit traces placed indicates the instance in a table is classified a... Tuning tool used to determine cpu and execution times for SQL statements Oracle directory tree structure are audit traces?! Have u applied HRMS or Legislative Patches intended to be a collection of PL/SQL code that a! Time a user commits a transaction Oracle records a new SCN in redo logs a PL/SQL but! Get the best job in the application getting the error message about increasing the cache. Type of index should you use to determine cpu and execution times for statements! Why we use raw devices in ASM answers - Duration: 1:48 column which indicates the instance a! Pl/Sql code that carries a single value look for errors from the database engine is used and free in table! Outcome of getting rid of all the rows in a RAC environment the information came from & Timed Statistics &! Difference here... both used for network connection to a database object to store and retrieve related data a. An Oracle database as well as Oracle Real application Clusters ( RAC ) command or alter...

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