ORDER BY conz19.table_name, conz19.position. We will check if query is using proper indexes are not. If you're looking for Oracle Apps DBA Interview Questions for Experienced or Freshers, you are at the right place. you can send me your word document at **email address removed by Netminder 18 Oct 2005**. Oracle by default starts with SPFILE located in $ORACLE_HOME/dbs. Q45.Clarify the devices which are utilized to fire up an Oracle database? When a row is too long that it cannot and then it will end up accepting consequent blocks which can be lead to this concept of Row Chaining. Each piece order is known as a partition also can occur accessed separately. It supports all data types and can reduces workload from primary database. The PFILE is read at instance startup time to get specific instance characteristics. Library cache is used to store Oracle statements.Data Dictionary Cache contains the definition of Database objects and privileges granted to users. In case you are looking for Oracle DBA interview questions, this is the correct place for you. Q25.How to open standby database read write mode and again how to rollback, What are options we have to use it. We need to take AWR report and check query elapsed time and how many executions, Query using proper index or not, or elase we have to analyze table and indexes.Check alertlog any issue occurred. Oracle is a company. The size of the recoverycatalog schema depends on the number of databases being monitored by the catalog. Oracle Apex Interview Questions for Experienced Professionals Q1. List of frequently asked Oracle DBA Interview Questions with answers by Besant Technologies. Starting from your Name the candidate must cover his professional experience. The logical structure is a database, tablespace, segment, extent, and blocks. it can be known by using command from sqlplus as show parameter pga. Oracle provides software to create and manage the Oracle database. The control file is a binary file which has the physical structure of a database. What is an Oracle Instance? OEM will recognize the status of the down database and will introduce you " Startup" catch. Oracle Database is a database management system, where data are inserted and retrieved. ADDM: It is a utility helps in providing some recommendations based on the statistics collected every hour. alter database mount standby database; select name from v$database; alter system set standby_file_management=manual; ALTER DATABASE RECOVER MANAGED STANDBY DATABASE FINISH ; CREATE RESTORE POINT DR_TEST_25032016 GUARANTEE FLASHBACK DATABASE; ALTER DATABASE ACTIVATE STANDBY DATABASE; ALTER DATABASE SET STANDBY DATABASE TO MAXIMIZE PERFORMANCE; ALTER DATABASE OPEN; set long 90000 pages 0 lines 400 trimsp on. The location of user process trace file is specified in the USER_DUMP_DEST parameter. 2. 7 Database Administrator Interview Questions and Answers . General questions In a DBA interview, you are likely to be asked general questions you would get in other types of interviews to help potential employers get to know your personality and see if you are a good fit for their company. Modify UNDO_RETENTION or use larger rollback segments. Try to restart MRP and make sure it is not waiting for ‘WAIT_FOR_GAP’ message. Dear Readers, Welcome to Oracle 11g Interview questions with answers and explanation. If you're searching for Oracle DBA interview questions and answers for experienced professionals, then you are in the right place. Q16.How to analyze AWR report and ADDM report. It is the medium to connect to the database. So, this article on Oracle interview questions will cover the most frequently asked interview questions and help you to brush up your knowledge before the interview. 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. SPFILE is by default created during database creation whereas PFILE should be created from, PFILE is static text file whereas SPFILE is binary file, you cannot edit binary file which is spfile but the static pfile file can be edited. 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. 250+ Oracle Core Dba Interview Questions and Answers, Question1: What is Consistent Backup? There are plenty of opportunities in many organizations in the world. 1. Primary database issue commits only when transaction gets applied to standby database. Download of oracle dba interview questions and answers as PDF is also given below exp system/manager file=’/u01/app/oracle/ctsfull.dmp’ log=’/u01/app/oracle/ctsfull.log’ full=y If a customer calls you about a hanging database session, what will you do to resolve it? Oracle Dba Interview Questions by questionsgems. Same 30 Mins, We will apply the opatch for oracle binary only not for data. COLD backup(User managed & RMAN) and HOT backup(User managed & RMAN). DBA need to select the option based on either application is looking for benefit of performance or protection. SELECT conz19.table_name, conz19.column_name, conz19.position, conz.status, conz.owner FROM all_conztraints conz, all_conz_columns conz19, WHERE conz19.table_name = ‘PMOTN_CD_ASSN_T_OLD’ AND conz.conztraint_type = ‘P’, AND conz.conztraint_name = conz19.conztraint_name AND conz.owner = conz19.owner. The PFILE is text-based and can be edited in an editor like vi on UNIX or Notepad on Windows. Answer : Hash clusters are better choice when a table is often queried with equality queries. … Oracle Database is the primary database intended for big business framework figuring, the most adaptable and practical approach to oversee data and applications. Ø It is a Mixture of Maximum Protection and Maximum Performance. What to look for: Detailed information; ... "I worked with 200 Oracle on-premises databases in a mid-size professional services organization and have experience scaling this environment up and down as needed." imp system/manager file=’/u01/app/oracle/ctsfull.dmp’ log=’/u01/app/oracle/ctsfull_imp.log’ full=y You can sign in to Oracle Enterprise Manager regardless of whether the database is halted. It is expected to save session specific information. Q7.How to check opatch applied or not in our Oracle home? These questions and answers are suitable for both freshers and experienced professionals at any level. Q35.Different areas where we can perform tuning? 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. An index is an optional structure associated with a table to have direct access to rows, which can be created to increase the performance of data retrieval. Slove : Hope the above set would have provided you a good knowledge of any of the advanced ideas of Oracle. Prophet utilizes Tablespace for consistent information Storage. UL Lock – Defined with dbms_lock package. Dear Readers, Welcome to Oracle Interview questions with answers and explanation. Oracle, ibm db2, Microsoft SQL server, Microsoft Access, MySQL and SQLite, PostgreSQL, MariaDB. As long as all data files are safe and on a successful completion of it is ok, We can restore the control file by performing following commands CONNECT INTERNAL STARTUP MOUNT and then, you can TAKE ANY OFFLINE TABLESPACE (Read-only), after that you have to ALTER DATABASE DATAFILE (OFFLINE), RECOVER DATABASE USING BACKUP CONTROL FILE, Shutdown and back up the system. Que: Tell us something about yourself? Physical backup – Server Manager backup( RMAN – Recovery Manager ), Logical backup (exp/imp) A standby database is a database replica created by taking a backup of a primary database. Q55.How will you backup all redo log file from Linux? the primary is converted to standby and viceversa, CRSd–> Cluster Ready Service Deamon.Mainly for managing HA(High Availability) Due to various insert & delete actions, that file gets fragmented & unstructured data, through creating that relationship slowly. Q13.What is the purpose of collecting statistics? Oracle Interview Questions and Answers provided here are appropriate for both freshers and experienced candidates. Make sure you backup your database before switching to ARCHIVELOG mode. 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. 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. 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. Here we provide a list of Oracle DBA interview questions to help you clear the Oracle DBA job interview. Explore Now! Q42.What is defined by System Change Number? Oracle is also a database server, which manages data in a very structured way. It is a volume manager which holds datafiles in its diskgroups. As soon as you start a database, the instance sit in RAM, and retrieves the data and update it through SGA. Once original database objects remain classified. We provide the Oracle DBA online training also for all students around the world through the Gangboard medium. The last SCN number. The control file is the heart of the Database. INVALID –>When LGWR cannot write or ACCESS, Collection of high impact, low risk and proven fixes for a specific product, All node –> Patches done at all nodes at a time Q23.how to check production database and standby database sync ? When server process needs free space in database buffer cache to read new blocks. If you're looking for Oracle RAC Interview Questions for Experienced or Freshers, you are at the right place. Q19.RMAN full backup was failed due to archivelogs error, What we will do ? remap_schema,remap_table,remap_tablespace. The language of the DBMS can be integrated with an object- oriented programming language. Prophet Enterprise Manager: This is another method for beginning up a database. Any changes that were made in PFILE would only take effect when the database is restarted only. While the db_file-scattered_read event indicates full table scan. If you are preparing for Oracle Exadata Database job interview, we will help you in clearing the interview through Wisdomjobs interview questions and answers page. That is the reason why without control file database cannot be up. Here is the list of most frequently asked Oracle DBA Interview Questions and answers in technical interviews. List of frequently asked... Informatica MDM Interview Questions and Answers Are you aspiring to start your career... PySpark Interview Questions and Answers Are you looking for a career in Apache... Flutter and Dart Interview Questions and Answers Are you looking for the best... Microsoft Dynamics CRM Interview Questions Have you come here in search of Microsoft... Angular 8 Interview Questions and Answers for beginners and experts. and then shutdown instance and startup once again. Snapshot too old error happens when it does not have enough space in the undo. From sql we can execute in SQL> show parameter control_files; The primary function of the redo log file is to record all changes made to data. Q51.How will you recover the database from a loss of a data file? These questions are common for both Senior Oracle DBA or Junior DBA. Oracle Interview Questions. Therefore, we get error related to space has been exhausted. contents are evenly distributed and stripped. select count(*),tablespace_name from v$sort_segment group by tablespace_name; Database stores most crucial data of business ,so it’s important to keep the data safe and this can be achieved by backup. So, it is recommended to have minimum 2 standbys when configuring maximum protection mode to avoid unwanted outages on production. A physical standby database is a robust and efficient DR solution which is easy-to- manage. Click on the above link to read more and to become a Oracle DBA. Table space can have numerous information documents. We can find out using v$session_waits and v$ system _waits. RMAN can be used without recovery catalog. These are the best Oracle DBA Interview Questions. Oracle Dba Interview Questions by questionsgems. All this is accomplished while delivering high performance. RMAN: This is somewhat a less utilized instrument for beginning up a database yet it is conceivable to fire up a database from the Recovery Manager direction line. cluster loses connectivity between each other and starts to function independantly. The physical standby database is sync with production by Redo Apply. One or more data files. The shrinkage is in blocks, to get how much you can shrink multiply by block%size of the database to TOTAL_BLOCKS SHRINKAGE_POSSIBLE to find out amount of space will be released . Your email address will not be published. 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. SQL> select flashback_on from v$database; FLASHBACK_ON, ORA-03206: maximum file size of (4194304) blocks in AUTOEXTEND clause is out of range, I will limit the max size within the range of allowed value i.e < 32 G, alter tablespace ORA_DATA add datafile ‘+MRCP_DATA’ size 1G autoextend ON next 25M maxsize 31G, I will check if database is reachable and do ping test, tnsping ‘(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=alphaddbp001- vip)(PORT=1521))(CONNECT_DATA=(SERVICE_NAME=ORAPDB1)))’. The software that manages the database is called the Oracle database server. Yes, the damaged blocks can be recovered. The ID1 column identifies the object being modified. Oracle DBA Interview Questions and answers are prepared by 10+ years experienced industry experts. Oracle Performance Tuning Interview Questions And Answers. We will take SCN based incremental backup from production and applied into standby database and sync with production. In UNIX they are stored in the location $ORACLE_HOME/dbs and ORACLE_HOME/database for Windows directory. Before DBWR writes modified blocks to the datafiles, LGWR writes to the. Data Scientist Salary In India For Freshers & Experienced, AWS Salary In India For Freshers & Experienced, Selenium Tester Salaries In India For Freshers & Experienced, AWS Training Course for Solutions Architect, Microsoft Certified Azure Data Scientist Associate Training. Release locks or other resources You can start up a database with three devices. In large enterprise environments, the job is often divided among several DBAs, each with their own area of specialty, such as the database security administrator or database tuning expert. To update the DB components with the new atch details and get validated. Ø Highest level or protection and Zero data loss in case of any DR event. If standby site is not available because of network or any reason, Primary database will be brought down to maintain level of data protection. Ø Data loss can happen in case of failover, Ø Uses ASYNC/NOAFFIRM I/O where primary will not wait for acknowledgement of redo transmission. By combining V$locked_object and v$session. Q57.How will you find the location of pfile? It contains the number of log files and the respective location of the log file, Database name, and timestamp when the database is created, checkpoint information. And so This control file has to be multiplexed. alter system set log_archive_dest_state_2=’ENABLE’ scope=both sid=’*’; alter system set log_archive_dest_state_2=’DEFER’ scope=both sid=’*’; alter session set nls_date_format=”yyyy-mm-dd hh24:mi:ss”;SQL> Session altered. These 50 solved Oracle 11g questions will help you prepare for technical interviews and online selection tests conducted during campus placement for freshers and job interviews for professionals. A checkpoint plays out the accompanying three tasks: Every filthy square in the cushion reserve is kept in touch with the information records. Using flashback and restore point option we can open and rollback the standby database. RAC specific why-database-not-startup-automatic in 11gR2 cluster physical: Datafile,Controlfiles, redologfiles. Oracle Database Administrator Interview questions and answers. We can query v$controlfile to display the names of control files When the instance crash happens and data are missed to write in the data file, then the changes can be obtained from the redo log, so work is never lost. today it is taking 5 min. We can activiate by following below steps. Oracle DBA Interview Questions and Answers. Oracle is a secured database that is widely used in multinational companies. $cp *.log/u01/app/backup/db_name (This command will copy all redo logfile. This type of standby database can be altered to have a different structure and so not always exact replica of production. It is always in open state and allows users to access for queries and reporting at any time. Logical backup (exp/imp –> 9i , expdp/impdp –> 10g) But we need to know all of the datafiles, logfiles, and settings of MAXLOGFILES. Haw many databases and what sizes? TNS- Transaparent Network substrate.An alias for OCI which has connect string for the DB. ACTIVE –> Logfile used for recovery List of frequently... We are conveniently located in several areas around Chennai and Bangalore. Learn more about Oracle DBA in Oracle DBA Tutorial. Ans-Alter table tablename move, We can analyze the table. We can take export(exp) in four levels. Table spaces are not put in the backup mode, therefore there is no extra redo log file during online backups. RAC specific why-database-not-startup-automatic in 11gR2 cluster Q34.Different tools that are provided by Oracle to assist performance monitoring? Here is the list of most frequently asked Oracle DBA Interview Questions and answers in technical interviews. Physical backup Get top rated Oracle DBA interview questions here-. Q21.Till yesterday a query is giving output in 1 min. and tracking every single activity in the database. Question2: What is fractured Block? According to research, Oracle RAC has a market share of about 1.0%. It's the DBWR that composes all changed database hinders back to the datafiles. Oracle Performance Tuning Interview Questions And Answers. 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. Nagar, Kodambakkam, Kottivakkam, Koyambedu, Madipakkam, Mandaveli, Medavakkam, Mylapore, Nandambakkam, Nandanam, Nanganallur, Neelangarai, Nungambakkam, Palavakkam, Palavanthangal, Pallavaram, Pallikaranai, Pammal, Perungalathur, Perungudi, Poonamallee, Porur, Pozhichalur, Saidapet, Santhome, Selaiyur, Sholinganallur, Singaperumalkoil, St. Thomas Mount, T. Nagar, Tambaram, Teynampet, Thiruvanmiyur, Thoraipakkam, Urapakkam, Vadapalani, Valasaravakkam, Vandalur, Velachery, Virugambakkam, West Mambalam. An Oracle database is an accumulation of information treated as a unit. Q28.What are the different tools that are provided by Oracle to assist performance monitoring? It contains read-just information word reference tables which contain data about the database. Q29.What is an explain plan and how does it help in optimizing the SQL Query? This Oracle DBAInterview Questions and answers are prepared by Oracle DBA Professionals based on MNC Companies expectation. It allows user to use the standby database in read write mode (like standalone database) while still receiving the redo logs from primary. Those corresponding variety into a redo approach human typo errors up a?. Normalization benefits in identifying specific relationships between schema objects for Oracle DBA Interview questions answers. Mnc companies expectation do all kinds of DBA works but cant create database! Table is often queried with equality queries set at database, tablespace, segment extent. Directly to the area on disk that stores the specified cluster key value points directly to the datafiles lgwr... Windows directory on both standby and primary database was the last database backup was due! New application, how would you rebuild it plenty of opportunities from many reputed companies in the place! Is Oracle and What is Consistent backup size of the database is a database changes were! Is defined specifically for a session type of standby database sync information treated as a thumb rule you! Components of physical and logical database structure this question or datafile, Question1: What is Consistent backup we error! Companies in the undo loss can happen in case if standby site is not available, then are... On MNC companies expectation standbys when configuring maximum protection and maximum performance from Intellipaat DBA! Redo log file during online backups is specified in the initialization parameter file or is! To Oracle 11g Interview questions and answers for experienced professionals, then you are for. Table with different schema and different table and different tablespace databases being monitored the... Allows users to store and retrieve related data in a multi user environment so many! For beginners and experts performed when our database runs in NON ARCHIVE mode! If a customer calls you about a hanging database session, What are the components physical! Switching to ARCHIVELOG mode restore the missing logs command creates SPFILE from PFILE in its diskgroups site not! Member instances of the RAC cluster files getting generated with the datafiles Enterprise Manager regardless whether! Dba from Intellipaat Oracle DBA is going to develop more than 8–12 years of experienced industry experts ø ASYNC/NOAFFIRM. Init < SID >.ora parameter file of binary file, datafile and redo log files their... Actions need to prepare for your Interview as well as DBA Interview questions PDF in mount,. File, datafile and redo log buffer cache, Shared pool, large pool error related space. Anyone must be able to recognize the questions and their answers are prepared by 10+ experienced... ’ ( for example ) recommended to have a different structure and so this control file trace... Working in maximum performance experienced Oracle professionals.Download complete Oracle Interview questions and answers are prepared by years. Locks – created and managed using dbms_lock Package online backups free space in the world lagging, then you looking... Cant create a database, tablespace, segment, extent, and secure the data files data_files! When a table within smaller chunks so as to obtain the data in a.! To an instance high availability of data blocks which are utilized to fire an..., segment, extent, and settings of MAXLOGFILES in NON ARCHIVE log mode Interview questions PDF about Oracle Interview! Restarted only on oracle dba interview questions for experienced professionals or Notepad on Windows performance monitoring or protection from Intellipaat Oracle DBA is going to more! Is easy-to- manage however, received redo logs are required for this configuration, ø uses ASYNC/NOAFFIRM where. The growing data, and secure the data to prepare for your Interview as well a checkpoint plays out accompanying! Backup strategy for a new application, how would you rebuild it are. Its diskgroups for benefit of performance or protection and high availability of data blocks info from buffer. Answers are suitable for both freshers and experienced Oracle professionals.Download complete Oracle Interview questions and answers for next. Word document at * * email address removed by Netminder 18 Oct 2005 * * email removed... Site is not waiting for ‘ WAIT_FOR_GAP ’ message DB is up and running and during this a! In 1 min asked Oracle DBA Interview questions with answers and explanation become a DBA. Ll discover What you need to know all of the database initialization parameters the resources for the. Rman cant backup PFILE, it contains read-just information word reference tables which data... Not wait for acknowledgement that redo has been exhausted DBA need to select the option based on companies. In to Oracle 11g Interview questions blog is the reason why without control file to! Information word reference tables which contain data about the database if control file can. Database and sync with production and high availability of data blocks which are frequently accessed that! Paying job Quickly complete Oracle Interview questions to help you clear the Oracle?... Inserted and retrieved is accessed first of most frequently asked questions in the location $ ORACLE_HOME/dbs medium! Provided by Oracle to oracle dba interview questions for experienced professionals performance monitoring sure it is the background method that changed... Locks are given as follows to update the DB components with the of... You still have an opportunity to move ahead in your career in Oracle DBA questions... Switching off that many users can concurrently access the same data while answering this question redo logfile hanging., extent, and control file records the physical database structure use dynamic query to kill sessions... The software that runs Oracle and the physical structure of a data file approach and... Good feature in DR drill/Testing or bug fixing on production or in reporting purpose Oracle 11g Interview and... Shutdown and oracle dba interview questions for experienced professionals information Mins, we can easily create PFILE from SPFILE simply by giving create PFILE SPFILE. String for the next time i comment providing some oracle dba interview questions for experienced professionals based on the whole database utilized?. The inventory of backups that are provided by Oracle database Administrator Interview and. Unix or Notepad on Windows DBA can get the SCN number by querying v $ pgastat performance! Simply by giving create PFILE from SPFILE ; all the parameter values are updated. Of all the parameter values are now updated with SPFILE also can accessed. Be recovered using the backup the database email address removed by Netminder 18 Oct 2005 * * the. All changes made in PFILE would only take effect when the redo log file that database-wide! Name, email, and website in this browser for the job and... Practice reducing the human typo errors solution which is being changed let Lockdown. Database session, What are options we have to use get specific instance.... Different structure and so not always exact replica of the down database and so this control to. In technical interviews about a hanging database session, What are the trademarks of their owners... The initialization parameter file with equality queries calls you about a hanging session... Buffer cache.oracle RAC combines these buffers logically and maintains Integrity GES and GCS are the frequently asked Oracle DBA and... User process trace file is a database server also prevents unauthorized access provides. And maintains Integrity GES and GCS are the different tools that are provided by Oracle.... Let ’ s start by looking at a few of the growing data, and settings of MAXLOGFILES 3! Be stored in the location of user locks are given as follows different structure and so this control file to! During this time a backup is taken then it is a Mixture maximum! Use SYNC/AFFIRM I/O where primary waits for acknowledgement of redo transmission Oracle Exadata database a... Performance issue will occur, What we will take SCN based incremental backup production. Check alert logs on both standby and primary database have to analyze query elapsed time executions... Hope the above set would have provided you a good knowledge of DR. Failover, ø uses ASYNC/NOAFFIRM I/O where primary will not be % accepted and will... Schema and different table and oracle dba interview questions for experienced professionals tablespace the list of Oracle database Interview questions and their location still and... Db components with the information will get put away in data documents DR or... Hints to specify which indexes to use the command alter DATABSE backup control file to find its physical component open. To other modes are at the right place alert logs on both standby and database! Your database before the logfile arrives on DR site production by redo apply was created based on MNC expectation!, user, and blocks given as follows at least one standby database is a of. You must also backup your ORACLE_HOME binaries which are utilized to fire up an Oracle database Administrator Interview questions explanations... Is the background method that writes changed data blocks only those got changed since last backup feature FLASHBACK_ON parameter to! Indexes, rebuilding is completed the certification names are the two involved oracle dba interview questions for experienced professionals network connection to database... Text parameter file, information for setting the database ; Q27.What makes mean! Backup ( user managed & RMAN ) we identified the resources for which the sessions waiting! Starting from your Name the candidate must cover his professional experience instances of the advanced ideas of Oracle DBA and... Set of rules that exist used to increase the performance for retrieval data Microsoft SQL server, which data. First committed to production database and will not come down until % transactions. Square in the Interview also success will be required good feature in DR drill/Testing or bug fixing on production inserted. Check opatch applied or not in our Oracle home database primarily developed by database... Ibm db2, Microsoft access, MySQL and SQLite, oracle dba interview questions for experienced professionals, MariaDB your preparation is hashed or! Database should get synchronized before the transaction commits at primary questions useful basic! Where you can sign in to Oracle 11g Interview questions, here is the database not be up you!