Do I Need a Database Administrator? Why Is This Important to The Organization?

The company's image might be damaged if the customer's data is lost. You don’t need a DBA to handle database problems. If your company doesn't have a DBA, you might be unable to resolve critical database issues on time or together. Your company may lose business, fail to meet customer needs, or miss deadlines because you need to consult with a DBA to fix the problem. But to truly understand what a DBA does, we must go back to the basics.

A DBA makes your life easier and your business more profitable. How do you find the right person to work for you? How much should you pay? It all depend on your workload and technical environment. If you have more databases and all databases are running round the clock, you need to hire a senior-level database administrator who can handle this kind of complex environment very smoothly. And hiring senior DBA becomes costly.

Database administrator plays a very important role in the company because he/she protects your data. Data is very important for every company. 

Every company is using data to improve its products and services. In a typical company, there are a lot of databases that contain the data. So, when you have any kind of problem, you need to find the cause of it. Every company needs to protect its data. These data are stored in a database. And this database is administered and maintained by the database administrator. 

Nowadays, financial companies and telecom companies are using live database servers. Online banking, 24 hours ATM, share transactions, SMS, etc., are parts of the database server. These all database servers are being maintained by the database administrator.

What are the daily routine tasks of DBA:

Backup Database: A backup Database is one of a database administrator's most essential and crucial tasks. It should be done regularly to ensure that your database's data is not lost for any reason. In a real-time scenario, the backup procedure may take some time. You should schedule it to be performed at least once a week. 

The size of the backup file depends on the size of the database. Testing the backup on the demo or sample server is also the database administrator's work. Without testing, there is no guarantee of restoration.

DBA's daily routine tasks are backup, database performance, security, and space monitoring. 

How Much Does a Database Administrator Get Paid?

You can use one of the sites to look up the DBA's salary. You can find a salary by job title and location on Monster.com. Put in your favorite DBA title, and the location where you work DBAs earning the most money will be brought up in this list. dictionary dot com is another website. 

Underneath the definition, you will find a box with a list of different words. You can find a list of occupations with the highest average annual pay by clicking on the one that sounds the most like what you do. Sales, marketing, and all other "cloak-and-dagger" duties should be included on your resume. If you are good at what you do, the hiring manager should be willing to spend a lot of money on you.

How do I Become a Database Administrator?

There are many resources for self-study in the community. Try to find answers. You do not necessarily have to post them. The problems that keep people up at night can be understood by reading them. When trying to solve a problem, you might ask some questions. 

In online forums and communities, different people put their own problems. Some of those are resolved by others and you can get extraordinary knowledge using these resources. You can also post your query or problem. Invite some of the good experts. They will give you the best advice and guidance.

You can join some good online Oracle DBA Training centers or read Oracle DBA Interview questions for getting the best knowledge.

Who Should be a Database Administrator?

A degree in computer science is beneficial. You need to learn quickly and like technology. A four-year degree will put you on the right path, but it won't get you there. That's great if you already have a bachelor's degree. You're almost there! Preferably with a focus on internet and email marketing. Three years of experience in direct response or internet marketing is required. "big data" is not intimidating. You thrive in a fast-paced environment and welcome it. Excellent written and verbal communication skills are what you have. You can multitask like crazy. You are focused on results. You are driven. A good sense of humor is what you have.

What is a Database Administrator?

A DBA is an IT professional who manages Microsoft, IBM, and other databases. The Database Administrators are part of the IT Operations Team, the Application Support Team, or the Software Development Team. This article will discuss what a DBA does in an IT organization and how he or she can best contribute to the company's success. What is a DBA doing? The first thing a DBA does is take care of the database. It means doing routine maintenance and backing up databases. It also means moving data from one database to another.

Oracle DBA Interview Questions

Do you think those are being needed to clear job interview? Off course yes because you have knowledge of Oracle database administration but you don’t have experience about how to face technical questions. Sometimes, interviewer is very keen in recruitment and he or she is having good technical knowledge in database administration then interview will be toughest. Sometimes, interviewer is facing any database related issue or faced any problem then obviously he or she can be expect proper solution from candidate then he or she will be asking Oracle DBA interview questions related with same issues.

• What is SGA?
• What are background processes?
• What is ASM?
• What is RAC?
• If I will be kill SMON then what would be happening?
• My Oracle doesn’t bring up with error out of memory how can I resolve it?  
• What is relation between schema and Oracle user?
• I am altering datatype of table column does synonym will be invalidated?
• How can I recover database when datafile got corrupted?
• Which command should need to execute for unmounting ASM disk where 3 instances are running?
• What is command of checking last backup of RMAN?
• How to check defragmentation in database?
• What is the solution to remove defragmentation of tables?
• What is the command to remove connected user from database?
• Log file sync wait event is constantly appearing in top 5 wait event with high resource consumption in AWR report then what is the issue and how can I solve it?

You can see above Oracle DBA interview questions are very easy but some of those should need more concentration. Some of are tricky and those require more attention because you might be trapped. If any tricky question will be asked first during interview starting time and you will give wrong answer then what will be happening? First impression is last impression. You might be loose impression and chance of job too. Sometime your answer will be correct from your side but it won’t be expected by interviewer and interviewer is expecting something else answer then also you would be rejected.

Use smart technique for replying those tricky and real time scenario based Oracle DBA interview questions. If you will be act smart then you can be create good impression during technical interview or discussion. Chances of getting job become easier. 

You can find out so many technical interview related dba questions from web but all were outdated and some of having wrong answers. You should need to prepare yourself what interviewer expecting. Real time scenario based Oracle DBA interview Questions are available very rare with explanation on web. Off course, grabbing Oracle DBA job is dream of every DBAs but without proper preparation they get failure for getting job.

Query Rewrite in Oracle for Data Warehousing Application

Query Rewrite in Oracle for Data Warehousing Application

There are several ways that you can affect the optimizer’s logic in rewriting a query. First using the QUERY_REWRITE_ENABLED parameter, you can enable or disable the ability of the entire database to do query rewrites. This feature is very useful to maintain data warehouse database. Oracle supports so many good features and those are very useful in data warehousing database.

The QUERY_REWRITE_INTEGRITY parameter determines the freshness that is required of a materialized view. The options for this parameter are

ENFORCED:

The default setting for the QUERY_REWRITE_INTEGRITY parameter, this setting tells the optimizer to use only materialized views that contain fresh data. This setting also instructs the optimizer to use relationships that are based on enforced constraints like NOT NULL and Foreign key.

TRUSTED:

In this mode, the optimizer trusts that the data in the materialized views is correct and the relationships are correct. The optimizer also trusts declared but not enforced relationships and constraints, and it will use relationships specified by dimensions

STALE_TOLERATED:

In this mode, the optimizer trusts that the data in the materialized views is correct even if the views aren’t current and fresh. This mode offers the greatest flexibility in terms of rewrite capabilities but with the risk of returning incorrect results.

The safest level if rewrite integrity is ENFORCED. This setting guarantees that no data returned y the materialized view will be out of sync with a similar query against the base tables the base tables of the materialized view.

We can change above parameters in session level too using following commands.

Alter session set QUERY_REWRITE_ENABLED=true;

Alter session set QUERY_REWRITE_INTEGRITY=stale_tolerated;

This kind of questions can be asked during Oracle DBA interview questions and you can also need to take care for performance tuning during database services activities.

Can Oracle DBA Interview Questions help to clear Technical Interview?

How to Clear Tough Technical Interview Of Oracle DBA?

Different Oracle version has different kind of features. Every time Oracle changes version and introduces new features with new version. But company’s basic requirement is same. It cannot change with version changes. Due to this reason, interviewer thinks first company’s requirement and tries to ask those kinds of interview questions. Candidate should have superb knowledge of Oracle fundamentals and basic architecture. Candidate should need to keen about company’s basic requirement of opening.

We cannot say that interviewer would ask you same question from any book but interviewer always tries to test your skills and ask questions start from basics to advance. Real time scenario based Oracle DBA interview questions are very tough to understand and crack it. Those are based on practical hands on or experience. If you are able to understand those queries then easily crack it.

Sometimes interviewer tries to ask those questions, which are not related with their requirement. This time, interviewers attempt to read candidate’s mind about in toughest condition or situation how he or she would act. Take example, candidate acts normally any disaster recovery scenario. This kind of situation might not occur in company any time but they are asking this kind of questions to candidate.

Some good and nice book which contains only Oracle DBA Interview Questions Answers, then it would useful to candidate as well as interviewer too. Because using this kind of book, it becomes easier to judge candidate for all expectations without making prior home work. Interviewer always prefers this kind of book and use in any kind of interviews from junior level of interview to senior level of interview.

Every candidate fears about real time scenario based interview questions in technical interview of Oracle. They are not assuming which kind of questions is being asked. Due to this reason, they are losing self confidence before interview and finally they failed in technical interview. For avoiding this kind of situation, you need to prepare yourself using some nice quick ready reference book. Prepare with real time scenario based questions and think about another which kind of questions would be asked. Once you get basic idea and concept of this, you can easily judge another questions too. This situation would build your confidence.

Be careful about your preparation; take help of any good nice Oracle DBA Interview Questions book. Appear in your technical interview without hesitation, you would get success. Today, latest edition of Oracle DBA interview questions answers Book has been released with 4th edition. Discount rate is being offered for very limited time.