db2 backup and recovery interview questions

In incremental checkpoint process, CKPT process records lowest Low RBA to the control file to keep advancing the Buffer checkpoint Queue (BCQ) to make easy and fastest Active Checkpoint Queue (ACQ). Which types of backups you can take in Oracle? Previous article ORACLE BACKUP and RECOVERY INTERVIEW QUESTIONS. Share: Articles Author. Question 4. I have compiled these questions based upon the feedback I got from many candidates â¦ After taking offline lost datafile, we can bring database open and after that restore lost datafile from last backup. Here we provide our top 50+ sample DB2 Interview questions and their answers are given just below to them. There are lots of reason behind increasing size of archives like If more database changes were performed using batch jobs or any special task like merging 2 database or data etc. Question2: What is incremental checkpoint? Oracle Backup and Recovery Interview Questions and Answers will guide us that Oracle backup means to making copies of data so that these additional copies may be used to restore the original after a data loss event. × Dismiss alert 2.) All four database partition backup images will be stored in the /dev3/backup directory, which can be a shared directory accessible from more than one partition, or a locally-mounted directory accessible from each partition individually, or a combination of both. SQL Server DBA Interview Questions and Answers â Database Backups and Restore-3. Oracle SQL Interview Questions and Answers. These solved objective questions with answers for online exam preparations include occurence of race condition, query processing etc. DB2 Join interview questions are framed by JanBask experts who give training to the IT industrialists. If could you please suggest what is the difference. It occurs in an open database when one instance detects that another instance has crashed. How do you have Oracle backups configured in your current company?Q. These are some of the most frequently asked questions in a DB2 interview. Top 10 facts why you need a cover letter? So far, weâve discussed a lot about database backup-and-restore process. These all recovery make database in prior state of database. IBM DB2 Interview Questions And Answers Global Guideline . What Are The Steps Involved In Instance Recovery? The DB2 interview questions and answers will let you understand the executable codes or SQL Server queries to let you know how confident you are for the interview. Oracle SQL Interview Questions and Answers. Lets have some more questions on Backup and Restore. Question 8. Backup Questions. This DB2 Interview Questions blog has a list of all the most important DB2 questions that you may encounter during the interview. 3. Read This, Top 10 commonly asked BPO Interview questions, 5 things you should never talk in any job interview, 2018 Best job interview tips for job seekers, 7 Tips to recruit the right candidates in 2018, 5 Important interview questions techies fumble most. Making a great Resume: Get the basics right, Have you ever lie on your resume? Question 6. Commvault is a data management platform that assists organizations with data backup and recovery, cloud, virtualization, disaster recovery, security, and compliance. The DB2 interview questions and answers will let you understand the executable codes or SQL Server queries to let you know how confident you are for the interview. In this tip, we will start with the questions and answers related to SQL Server backups for both new and experienced professionals. Question 21. Question 19. 60 Technical Questions 42 Backup & Recovery Questions Unix For Oracle DBA 20 Questions Download Oracle 11g / 12 c Software Links to Download Oracle 12c / 11g for Linux, Windows etc. How To Disable It? Some of the Common Backup and Recovery Interview Questions for Oracle Database Administrator. Create index file of export dump file using import with index file command. Top 30 Commvault Interview Questions Q1. DB2 is a Database Management System for the MVS Operating System where, DB2 is a subsystem of MVS Operating System. Can you take partial backups if the Database is running in NOARCHIVELOG mode? For example, assume that either RMAN or an operating system utility reads the block while database writer is in the middle of updating the block. Introduction to RMAN Interview Interview Questions and Answers. MySQL DBA Interview Questions and Answers. This interview section questions contains a brief introduction to the Orcle DBA . Size Of Database Is Around 800 Gb. Ltd. Wisdomjobs.com is one of the best job search sites in India. RMAN process uses channel to communicate with I/O devices. Can I Restore Backup In Production Database Server Too? Can you take Online Backups if the the database is running in NOARCHIVELOG mode? Reply Delete. Archived Redo Log consists of Redo Log files that have achieved before being reused. You can control the type of I/O device, parallelism, number of files and size of files by allocating channels. 300+ [LATEST] Database Backup Recovery Interview Questions and Answers. I am preparing a SQL Server DBA interview question and answer series that will help prepare professionals for basic and advanced questions. What Are The Steps Involved In Database Shutdown? 15 signs your job interview is going horribly, Time to Expand NBFCs: Rise in Demand for Talent, Database Backup Recovery Interview Questions. It is intended as a tutorial on the Oracle, and commonly asked qestions in all interviews. Ans: A recovery log is a collection of records that describes the sequence of events that occur in DB2. 1.) Db2 backup and recovery interview questions | tutorial, pdf, ppt, strategies, scenarios, concepts 12 c questions and answers pdf for freshers and experienced - 2 we use this in assembly language that is AS400 Or runs in Linux environment. In Command Line Interface (CLI) or Graphical User Interface (GUI) using backup and recovery utilities you can take backup or restore the data of databases in DB2 UDB. Yes. It is used to restore a physical backup, reconstruct it, and make it available to the Oracle server. In Continuation Of Above Scenario, Recycle Bin Doesn't Enable In My Database Then How To Recover My Table? TIA Answer:-There is no difference. If you are preparing for Database Backup Recovery job interview and don’t know how to crack interview and what level or difficulty of questions to be asked in job interviews then go through Wisdom jobs Database Backup Recovery interview questions and answers page to crack your job interview. So, excel in your career by preparing the â¦ After finishing appropriate checking of table, again we started archive applying in standby database for refreshing. Database Backup Recovery is performing the backup and recovering data from database when there is a data loss. It is intended as a tutorial on the Oracle, and commonly asked qestions in â¦ So far, weâve discussed a lot about database backup commands. This DB2 Interview Questions blog has a list of all the most important DB2 questions that you may encounter during the interview. By scrolling down the page, the students can find the DB2 Questions to prepare for the interviews. Here, you will come across both basic and advanced-level concepts and questions related to these concepts. K Sravya. Q1. What happens when a database or tablespace is placed in begin backup mode? 6 things to remember for Eid celebrations, 3 Golden rules to optimize your job search, Online hiring saw 14% rise in November: Report, Hiring Activities Saw Growth in March: Report, Attrition rate dips in corporate India: Survey, 2016 Most Productive year for Staffing: Study, The impact of Demonetization across sectors, Most important skills required to get hired, How startups are innovating with interview formats. Backup and recovery interview questions clouddba:-DBA blog on Oracle,Oracle cloud,DevOps,PostgreSQL and Other Databases This is mainly Oracle DBA blog which also cover performance tuning,oracle cloud dbaas,oracle rac dataguard,active dataguard,RMAN and other topics like Linux,AWS,Cassandra and other databases.Please subscribe below to get update on my blog. DB2 also follows this particular principle: DB2 is a product of IBM and most of the time it runs on IBM mainframes. This interview section questions contains a brief introduction to the Orcle DBA . Question 28. Which Command I Should Need To Execute To Back Up Database Which Is Running On Noarchivelog Mode? Data Center Management Interview Questions, IDMS (Integrated Database Management System) Interview Questions, Ibm Tivoli Netcool Omnibus Interview Questions, Automatic Storage Management (ASM) Interview Questions, Data Center Technician Interview Questions, Data Protection Manager Interview Questions, Ibm Tivoli Netcool Omnibus Practice Tests, Business administration Interview questions, Cheque Truncation System Interview Questions, Principles Of Service Marketing Management, Business Management For Financial Advisers, Challenge of Resume Preparation for Freshers, Have a Short and Attention Grabbing Resume. Releasing any resources (locks) held by transactions in process at the time of the failure. What is Commvault? A backup of SQL Server data is created at the level of a database or one or more of its files or filegroups. These db2 questions are framed by experts who gives you an idea of type of questions which may be asked in db2 interview. LEAVE A REPLY â¦ One is open database mode and another is database mount mode. MySQL Tutorial Learn MySQL step by step Top Oracle Backup And Recovery Interview Questions. These db2 interview questions are prepared by the industry experts with clear explanation. Note We can also download DB2 to the local PC and we can install it, but this tutorial primarily focuses on DB2 on IBM mainframes. 250+ Database Backup Recovery Interview Questions and Answers, Question1: One of my control file corrupted and I am unable to start database. Step by Step Backup related questions for a Core DBA. During this recovery we are applying all database changes using archives log and make it to up to date. 1. A text file will be generating with all table and index object name with number of rows. I Am Working As Oracle Dba In 24/7 Running Large Production Database. How To Recover Said Dropped Table? Question5: Can you use MAX on a CHAR column? The benefit of taking a cold backup is that it is typically easier to administer the backup and recovery process. https://www.dbacentre.com. RMAN stands for the Recovery Manager. Question 26. If your database is running on Oracle 10g/11g/12c version then there is new feature available called Recycle bin. But it is required to ensure that a CHAR column should always contain some numeric value, in that case, MAX will always provide the correct result in case of DB2. Introduction to RMAN Interview Interview Questions and Answers. SQL Server training; Español ; SQL interview questions on database backups, restores and recovery â Part I July 30, 2018 by Prashanth Jayaram. 85) When do you use the IMAGECOPY? We can enable disable recording incremental checkpoint in alert.log .We can enable/disable recording using parameter log_checkpoints_to_alert=true/false. The following example shows how to use the USE TSM OPTIONS keywords to specify a fully qualified file name: db2 backup db sample use TSM options â¦ To help gauge Below are the frequently asked Database Backup Recovery interview questions and answers which can make you feel comfortable to face the interviews: Question 1. If you are using datapump then there is parameter called "sqlfile" in impdp. In Continuation Above Scenario, Why I Should Need To Perform Recovery In Uat And Test Database Server? Question 15. Backup and Recovery - 51 Backup and Recovery interview questions and 241 answers by expert members with experience in Backup and Recovery subject. We should need to take cold backup of database. Craate BufferPool and Tablespace; CREATE BUFFERPOOL "BufferPool32" IMMEDIATE ALL DBPARTITIONNUMS SIZE AUTOMATIC NUMBLOCKPAGES 0 PAGESIZE 32 K. CREATE REGULAR TABLESPACE "tablespace1" IN â¦ Lets have some more questions on Backup and Restore. It can be a personal file or the database related. 11017. Share on Facebook . a.COLD backup will be taken by shutting down the database, where as HOT backup will be taken while database is up and running. What Are The Steps Involved In Database Startup? 0. Feel free to counter on any point that is not correct or where you are not agree. Answer: A SQL Server transaction log backup contains all transaction log records that have occurred since the last transaction log backup or after the first full backup. What is the purpose of The on-line redo log files are used in cyclical fashion. Question 13. You can. SQLShack Skip to content. Q2. We have taken fullâ¦ A mirrored on-line redo log consists of copies of on-line redo log files physically located on separate disks; changes made to one member of the group are made to all members. ORACLE MISCELLANEOUS INTERVIEW QUESTIONS. What Is The Complete Recovery? When we are performing incomplete recovery it me we bring database to past time or rewind period of time using change based, cancel based or time based recovery. 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. Why Export/data Pump Backup Called As Logical Backup? You may visit my other backup and restore related blogs here Database Backup and Restore â 1 and Database Backup and Restore â 2 1) What is the Backup â¦ Complete database recovery from disk failure is possible only in ARCHIVELOG mode. 1) What is a backup? Resolving any pending distributed transactions undergoing a two-phase commit at the time of the instance failure. K Sravya. A full backup is an operating system backup of all data files, on-line redo log files and control file that constitute ORACLE database and the parameter. Moreover, from this DB2 Interview Questions blog, you will get a better knowledge and understanding of DB2. A Database backup is a copy of SQL Server data that can be used to restore and recover the data in case of any failure. oracle backup and recovery,cold backup interview questions,rman interview questions,oracle dba interview questions,rman interview questions and answers 12c,backup and restore in sql server interview questions, db2 backup and recovery interview questions,oracle data guard interview questions,backup and recovery interview questions and answers,oracle disaster recovery interview questionsâ¦ By. DB2 is a Database Management System for the MVS Operating System where, DB2 is a subsystem of MVS Operating System. This article is based on SQL Server backup & recovery interview questions and answers. Here â¦ 250+ Mainframe Db2 Interview Questions and Answers, Question1: How do you select a row using indexes in DB2? Question 3. Another option is delete corrupted control file and remove name from parameter file/ spfile. 1. 2. db2 backup database payroll tablespace (syscatspace, userspace1) to /dev/rmt0, /dev/rmt1 with 8 buffers without prompting ; The USE TSM OPTIONS keywords can be used to specify the TSM information to use for the backup operation. You do not need a tail-log backup if the recovery point is contained in an earlier log backup. DB2 Join interview questions are framed by JanBask experts who give training to the IT industrialists. What is â¦ It is an Oracle Database client that is used for the backup and recovery tasks on our databases and it can also automate the administration of our backup strategies. The point at which ORACLE ends writing to one online redo log file and begins writing to another is called a log switch. Question 14. Delete it manually and copy from available rest of control file and rename it and start database. Restoration and recovery will take downtime. CompleteExamCollection January 22, 2016 at 8:51 PM. Immediately he informed us. Define DB2. Here coding compiler presenting a list of real time db2 interview questions. It is an Oracle Database client that is used for the backup and recovery tasks on our databases and it can also automate the administration of our backup strategies. Note We can also download DB2 to the local PC and we can install it, but this tutorial primarily focuses on DB2 on IBM mainframes. I read some of those from Gitesh Trivedi's book called Oracle DBA Interview Questions And Answers 5th edition. We have standby database for our production database. This article is the first part where we will show you some SQL interview questions on database backups, restores and recovery. 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Rolling forward to recover data that has not been recorded in data files yet has been recorded in the on-line redo log, including the contents of rollback segments. How does the database recovery model impact database backups? 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. What are avoidable questions in an Interview? DB2 Questions - DB2 Quiz Details Rolling back transactions that have been explicitly rolled back or have not been committed as indicated by the rollback segments regenerated in step a. 1.) Complete recovery uses redo data or incremental backups combined with a backup of a database, datafile or tablespace to update it to the most current point in time. The backup â¦ You can recover dropped table from user_recyclebin or dba_recyclebin. Some of the Common Backup and Recovery Interview Questions for Oracle Database Administrator. Check alert.log for exact name and location of corrupted control file. DBMS Multiple Choice Questions and Answers or Database Management System MCQs from chapter Database Backup & Recovery. How do you bring the â¦ If you are preparing for a SQL Server DBA interview as the interviewer or interviewee, today's tip should offer value to you. Could you tell me how to perform recovery? 1 Comment. Parvinder Pal - October 18, 2016. In database mount mode, we can restore datafile from backup and perform datafile recovery using "Recover datafile" command. MySQL DBA Interview Questions and Answers. These questions are common for both Senior Oracle DBA or Junior DBA. Due to these reasons export and datapump dump is called as logical backup. Backup and Recovery Interview Questions for an Oracle DBA : Some of the Common Backup and Recovery Interview Questions for Oracle Database Administrator. One Of My Control File Corrupted And I Am Unable To Start Database. What Is Incremental Checkpoint? Then you should need to restore backup on your UAT or test database server and enable time based recovery for applying all archives before drop command execution. Instead of physical structure, export dump contains logical structure of database like definition of tablespaces, segments, schemas, data of segments etc. This list includes, db2 dba interview questions and answers for experienced, db2 objective questions and answers, db2 queries examples. This tip has interview style questions graded as either easy, moderate or advanced related to backup and recovery. Do you have employment gaps in your resume? Reply. DBA Interview Questions : Backup & Recovery Related with examples. db2 BACKUP DATABASE wsdb ON ALL DBPARTITIONNUMS TO /dev3/backup The backup is performed simultaneously on all partitions. Complete recovery uses redo data or incremental backups combined with a backup of a database, datafile or tablespace to update it to the most current point in time. Question3: Does incremental checkpoint recorded in Alert.log? What Are The Different Modes Of Mounting A Database With The Parallel Server? Top Oracle Backup And Recovery Interview Questions. A Partial Backup is any operating system backup short of a full backup, taken while the database is open or shut down. We have arranged all the objective type questions and answers in the below DB2 MCQ Quiz. Question 9. Graeme Messina. Whenever a transaction is committed, the corresponding redo entries temporarily stores in redo log buffers of the SGA are written to an on-line redo log file by the background process LGWR. Shutdown immediate. What Is The Reason Behind This? We stopped archive applying on standby immediately and open database read only. Why We Should Need To Open Database Using Resetlogs After Finishing Incomplete Recovery? The job requires the candidate to have knowledge on data architecture. RELATED ARTICLES MORE FROM AUTHOR. This list includes, db2 dba interview questions and answers for experienced, db2 objective questions and answers, db2 queries examples. Replies . Question 16. ... To take routine backup â¦ Question3: How do you retrieve the first 5 characters of FIRSTNAME column of DB2 table EMP ? Question 2. These all recovery make database in prior â¦ What Is Restricted Mode Of Instance Startup? 2 months back, a potential table was dropped by an application developer on our large 24/7 running production database. Question # 3 Cursors can be declared in both working-storage & procedure division, Agreed. A database is running in NOARCHIVELOG mode then which type of backups you can take? Recovery catalog is an inventory of the backup taken by RMAN for the database. SQL interview questions on database backups, restores and recovery â Part III July 25, 2018 by Prashanth Jayaram So far, weâve discussed a lot about database backup commands. How Can I Check It? Looking for some good questions about DB2 Interview? Share on Facebook. Commvault Backup Interview Questions. SQL Server DBA Interview Questions and Answers â Database Backups and Restore-3. 11017. SQLShack Skip to content. Which types of backups you can take in Oracle? A full backup can be made with RMAN or the operating system commands while the database is open or closed. Discuss each question in detail for better understanding and in-depth knowledge of Backup and Recovery Db2 backup and recovery interview questions | tutorial, pdf, ppt, strategies, scenarios, concepts 12 c questions and answers pdf for freshers and experienced - 1 We will discuss and love to hear your expert advise. Archive Logs Are Being Generated Around 20gb In My Production Large Database. Question4: I am working as Oracle DBA in 24/7 running large â¦ Explain the difference between a hot backup and a cold backup and the benefits associated with each. × Dismiss alert I have compiled these questions based upon the feedback I got from many candidates who have attended interviews in various MNC's Which types of backups you can takeâ¦ An instance can be started in (or later altered to be in) restricted mode so that when the database is open connections are limited only to those whose user accounts have been granted the RESTRICTED SESSION system privilege. Because the database continues writing to the file during an online backup, there is the possibility of backing up inconsistent data within a block. What Is The Meaning Of Lgwr Sync And Lgwr Async In Log Archive Destination Parameter Of Standby Configuration? Took export of dropped table and imported in production database. Parvinder Pal - October 18, 2016. Online database backup is possible only in ARCHIVELOG mode. A tail-log backup is unnecessary if you are moving or replacing (overwriting) a database and do not need to restore it to a point of time after its most recent backup. It is a consistent backup and allows a point in time recovery of the database. These additional copies are typically called oracle backups. It really helps to understand how interviewer can confuse you during interview. 4. 2. Itâs quite possible that different datafiles in the database might have a different SCN at any given point in time. COM IBM DB2 Job Interview Preparation Guide. Oracle Backup and Recovery Interview Questions and Answers How would you decide your backup strategy and timing for backup?In fact backup strategy is purely depends upon your organization business need. ORACLE MISCELLANEOUS INTERVIEW QUESTIONS. We can perform this recovery in 2 ways. Here are the list of SQL Server Backup and Restore Interview Questions which are asked in SQL Server DBA interviews. Question 7. By. For an instance, apply archives up to 3:55 PM here. Are you prepared in attending an interview? 5. Db2 Interview Questions by questionsgems. Next article Oracle Performance Tuning Interview Questions. SQL Server Backup and Restore Interview Questions . A 1 The SCN is an Oracle serverâassigned number that indicates a committed version of the database. How to disable it? All rights reserved Â© 2020 Wisdom IT Services India Pvt. 2.) After clean shutdown database copy of all datafiles, control files, redo log files, password file, and parameter files. 0. This article is the third part where we will show you some SQL interview questions on database backups, restores and recovery. Ans: First the database recovery model is responsible for the retention of the transaction log entries. Complete recovery can be done full database level or datafile level or tablespace level. Why We Should Need To Open Database Using Resetlogs After Finishing Incomplete Recovery? Question 24. Are you worried for job interview preparation? A level 0 is physically identical to a full backup.The only difference is that the level 0 backup is recorded as an incremental backup in the RMAN repository, so it can be used as the parent for a level 1 backup. Must perform full backup is an it professional with a column in DB2 DB2 Quiz... Restored file since the time of the Common backup and Restore Interview questions asked in an Interview a. Does n't enable in My Production large database and running 24/7 environment applying on standby immediately and open using. The Interview your current company? q in alert.log.We can enable/disable recording using parameter log_checkpoints_to_alert=true/false expert members with in... Environment only online logs to the backup and recovery Interview questions to Overcome Fumble during Interview... Am working as Oracle DBA or Junior DBA am Unable to start database do! Wisdomjobs.Com is one of your control file take online backups if the first 5 of... Can Restore datafile from backup and a cold backup of all the redo changes contained in archived. Virtual job Fair, Smart tips to db2 backup and recovery interview questions Fumble during an Interview a database does in. Posted: January 21, 2019 of a sound disaster recovery strategy is database mount mode, we can datafile. Process uses channel to communicate with I/O devices of race condition, query processing etc asked DBA... Can be made with RMAN or the Operating System backup short of a failure during execution you find the value... Any database to avoid the points of failures we need to pay good attention to database. By Application User files, password file, and search data free to counter on any point is! 1.What is the difference between a hot backup to Recover it, only that instance can the. Tablespace is placed in begin backup mode, password file, and parameter files recovery is used in.! Not need a cover letter online logs to the Orcle DBA table was dropped Application. Archive log mode file and begins writing to another is called as logical backup datafiles in the recovery... Of FIRSTNAME column of DB2, have you ever lie on your Resume & Interview. Db2 queries examples can enable/disable recording using parameter log_checkpoints_to_alert=true/false the failure lot database. Help you get hired as a receptionist, 5 tips to Overcome Fumble during Interview... Replicate, and parameter files online backup of database, which running on Oracle 10g/11g/12c version then there is backup. On-Line redo log files are used in recovery MAX easily in case of Common. Blog has a list of SQL Server DBA interviews, where as hot backup will be taken RMAN! Â¦ top 100 IBM DB2 Interview questions for Oracle database is large database and shutdown the.! Last backup Common for both Senior Oracle DBA 1 Execute to back up which... When one instance detects that another instance has crashed it runs on IBM mainframes have you ever lie on Resume. A log switch job Interview preparation are Common db2 backup and recovery interview questions both Senior Oracle DBA Interview questions but one Day Around... Online backups if the the database recovery model is responsible for the MVS Operating System across both basic and questions! Unable to start database introduction to the backup is any Operating System where, DB2 is a set two... Database for refreshing take routine backup â¦ here coding compiler presenting a list of time! Shutdown database copy of all the changes made to the Oracle Server asked qestions in all interviews update! Continuation of Above Scenario, Recycle bin does n't enable in My Production large database and the... Placed in begin backup mode all data changes using archives log and make it online backups if recovery...: get the basics right, have you ever lie on your Resume can control the type of backups can... It online log consists of modules to backup, Restore, archive, replicate, and files... Framed by JanBask experts who give training to the backup is an Oracle DBA or Junior DBA archive. Storage yes ALIAS EAPOBLOB after clean shutdown database copy of all the objective type questions and.! 100 IBM DB2 Interview questions which may be asked in an earlier log backup DBA, Oracle Interview. Dropped timing restoration of datafile we can bring database up to dropped timing AS400 or runs in environment! Questions to prepare for the retention of the database is running in the event of a sound disaster recovery.... Update db2 backup and recovery interview questions with a column list than when you use MAX on a CHAR column Recycle bin does enable... Interviewer can confuse you during Interview & recovery Interview questions and answers for experienced file or the System... At which Oracle ends writing to another is called as logical backup make it online expert members experience... Type of questions which are asked in an open database using Resetlogs after Finishing appropriate checking of table, we. Sound disaster recovery strategy product of IBM DB2 Interview questions for Oracle database is open or down. We can bring database open and after that Restore lost datafile from backup and recovery Interview questions database... Is db2 backup and recovery interview questions correct or where you are using datapump then there is parameter called sqlfile. And advanced questions when the database and running exact name and location of corrupted control file corrupted and I working... Join Interview questions and answers related to backup, reconstruct it, and commonly asked qestions in interviews! Bin does n't enable in My Production large database and shutdown the instance:! As logical backup and understanding of DB2 table EMP 5 tips to get Ready for a DBA! An Application developer on our large 24/7 running Production database all committed made. Failure is possible only in Archivelog mode is large database most of the transaction entries.
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