Hadoop data load interview question answer preparation

1) What are all the datasources from which we can load data into Hadoop?
Hadoop is an open source framework for supporting distributed data and processing of big data. First step would be to pump data into hadoop. Datasources can come in many different forms as follows:
1) Traditional relational databases like oracle
2) Data warehouses
3) Middle tier including web server and application server – Server logs from major source of information
4) Database logs
2) What tools are mainly used in data load scenarios?
Hadoop does offer data load into and out of hadoop from one or more of the above mentioned datasources. Tools including Sqoop, flume are used with data load scenarios. If you are from oracle background think of tools like datapump, sql*loader that help with data load. Though not exactly the same logicwise they match
3) What is a load scenario?
Bigdata loaded into hadoop can come from many different datasources. Depending on datasource origin there are many different load scenarios as follows:
1) Data at rest – Normal information stored in files, directories, sub-directories are considered data at rest. These files are not intended to be modified any further and are considered data at rest. To load such information HDFS shell commands like cp, copyfromlocal, put can be used
2) Data in motion – Also called as streaming data. This is a type of data that is continuously being updated. New information keeps on getting added to the datasource. Logs from webservers like apache, logs from application server, database server logs say alert.log in case of oracle database are all examples of data in motion. It is to be notes that multiple logs need to be merged before being uploaded onto hadoop
3) Data from web server – Web server logs
4) Data from datawarehouse – Data should be exporeted from traditional warehouses and imported onto hadoop. Tools like sqoop, bigsql load, jaql netezza can be used for this purpose
3) How does sqoop connect to relational databases?
Information stored in relational DBMS liek Oracle, MySQL, SQL Server etc can be loaded into Hadoop using sqoop. As with any load tool, sqoop needs some parameters to connect to RDBMS, pull information, upload the data into hadoop. Typically it includes
3.1) username/password
3.2) connector – this is a database specific JDBC driver needed to connect to many different databases
3.3) target-dir – This is the name of directory in HDFS into which information is loaded as csv file
3.4) WHERE – subset of rows from a table can be exported and loaded using WHERE clause

PMP Exam Preparation Tutorial

PMP exam the popular credential offered by Project Management Institute aka PMI is often considered crown certification among project management aspirants and job seekers. The essential credential many employers, recruiters look for while hiring project managers is the PMP.
PMI often conducts review of its exam content in the form of role delineation study that takes into consideration roles, responsibilities of project managers in many different industries, the way they evolve, keep changing to meet current trends. This is included and updated in PMBOK, Project Managment Body Of Knowledge the standard that gets updated by PMI on a priodic basis. This update on an average does happen once in two to three years.
PMBOK book is the basis upon which PMP credential is designed. Complete understanding of PMBOK knowledge areas, tasks within each knowledge areas is often expected as an essential skill while choosing project managers who undertake new projects as well as someone who is already well experienced and standardizes himself by understanding PMBOK.
PMP exam preparation involves lot of preparation, practice. We at learnersreference.com would like to help you with exam preparation and success by providing useful PMP exam preparation articles. For daily updates in your inbox, have an email subscription with us.

TNS Listener service down root cause investigation

There are times a DBA can expect an application down scenario. We will be made to believe that the database is gone, entire application is down, there is a corruption in database causing DB down situation, database server is gone etc.
Once we login, do RDP session into database server the issue will turn out to be extremely simple. Let us consider a windows environment and here is what you can do to investigate the down scenario
1) Log into sql prompt, see if database is up and running
sqlplus /nolog
connect sys/password@oracle_sid as sysdba
2) Look for status of database
select open_mode,database_role from v$database;
If the above query returns READ WRITE output, now the issue is outside scope of database
3) Launch services panel, see all oracle related services are up and running – OracleORACLE_SIDService, Oracle TNSListener service mainly needed for DB functioning
Based on query output we can be really sure that OracleORACLE_SIDService is not down. Problem should be with Oracle listener service. As a second testing method run the following command from client environment:
tnsping db_server_name
Above command might return an error showing that database is down
In any case, start the listener service
Now, we see that an attempt to start this will fail causing the service to be in STOP status. Lets start investigating the root cause of this issue
1) Navigate to $ORACLE_HOME/network/admin folder. Check the hostname details in network configuration files – tnsnames.ora, listener.ora – I had a catch 22 recently and it turned out that they cloned the server and failed to change the hostnames causing listener service to be down. Upon renaming them properly, listener started working fine
2) If all the entries are fine, now go to client machine. Navigate to oracleclient/network/admin folder. Check for proper servername in tnsnames.ora. This might be the culprit causing issue during client connection. Make the changes to fix the connectivity issue
3) If none of the issue exists check for logfile in ORACLE_HOME/network/logs folder. If you don’t understand error raise a support ticket with oracle support

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Tourist spot 1 year old baby

As a parent enjoying parenthood for about 1 year, you might start thinking more on what are all the places to explore with your 1 year old kid. As with pets, kids are sensitive to tourist spots 🙂

Ever since your wife did see a positive sign in her pregnancy kit, the world would have been 360 degree different. Starting with food habits, lifestyle changes all the routine including vacation would have been different for the past 2 years. Now, lets see what places does fit your bill

  1. Zoo – It would be perfect to check some zoo that is closer to your county. Look for details on animals in exhibit that you think might interest your little one. It is to be noted that kids may not realize what they are watching but would try to relate the pictures they have seen all these months with the real animals. You can carry animal pictures, show them while watching real animals, reptiles etc and make them understand better. It would be fun to explore ray touch pools, feed the ray fish that has now been part of many zoo’s. Note that most of the zoo visits does not cost a single penny. It is 100% FREE for kids under 2 years of age. animals, fresh greenery would add more interest to your visit. If you live in hot places, see that zoo has extended weekday hours that does offer an option to stroll around your kids in the evening rather than mid-day hot sun. Zoo has train railroad ride option, waterfront ride option, pony ride option, Farm feed option, String ray fish pool feed option etc. This might cost $2 to $5 depending on zoo . Zoo visit is 100% worth it. Some zoo’s offer summer movies between 6pm-8pm. You can take kids as small as 6 months to zoo
  2. Aquarium – Another interesting option to explore fishes, enjoy penguin feeds, seal feeds, sea lion feeds, ray tank food feed, whale feed would be aquarium. Zoo in most counties does host a small aquarium as a portion of it. If not look for aquarium closer to your place. As opposed to zoo, aquarium is closed and is a perfect bet even during a hot sunny day. They offer movies in theaters inside aquarium. Your little ones will enjoy cute tentacles of star fish, would be interested in watching moon like octopus, aquatic feed shows etc. Again you can start taking out kids as young as 5 to 6 months of age as the aquarium has no risk of exposure to hot sun.
  3. Beaches Boardwalk – It may not be perfect time to build castle in sand. It is an optimal time to stroll around in beach boardwalk. This is 100% FREE option. They love colors, love to enjoy lights inside casinos. Look for smoke free areas. They love to watch game shows, toy chows that do get hosted in boardwalk. Again during sunny day look for weather condition before going out. Age around 6 plus months would enjoy this
  4. Museum – Kids may not fully enjoy a normal museum. Look for theme based museums like pre-historic creature museums that does have artificial well built exhibits of creatures like dinosaur, reptiles etc. These parks do come with entry fee for parents. Typically kids under 2 years of age get FREE entry in all these places
  5. Local festivals involving moving objects – In summer season most states, counties host festivals like balloon festival, kite festival. Though you may not prefer balloon ride, your kids will enjoy to see lots and lots of colorful balloons riding beautifully. Kite festival is another visual treat for your cute little ones. As such these options have no age restriction. Make sure the weather condition does fit your bill

What to carry while taking out the baby?
It would be always appropriate to have a separate bag for your baby. Maintain the following items as first baby aids during travel

  1. Diapers – These are the parent saviors. Maintain sufficient number of diapers. Make it a point to stack age relevant diapers. Say you piled up the diapers before 6 months, they may have outgrown the diaper size

  2. Baby Wipes – Have a box full of baby wipes. If you have this separate than home baby wipes box it would be better

  3. Diaper Rash cream – If your little one is sensitive and prone to rashes in this hot humid weather, better carry a rash cream with you

  4. Tissue papers – Paper towels help us wipe the dirt after feeding, cleaning hands etc
  5. Formula/Food  – Typically this is something that should be added to the bag during travel
  6. Towel – Have a spare baby towel
  7. Burp cloth
  8. Additional set of dresses – This is something that can be added during travel
  9. Camera – You always love to stack the memories. Take your handy camera phone (or) a separate camera during travel
  10. Sun-screen lotion – If you visit on hot sunny day, this is an option that will help you and your little ones to be protected from hot burning sun

How to save money on baby travel?
Always plan well in advance. Here are some steps every parent can take before travel

  1. Deals – Check websites that offer deals relevant to spots say zoo, aquarium related coupon website. Check the website of the zoo or aquarium. At times online booking will help you save good money
  2. Choosing day of the week – Say you have sufficient vacation and you find that ticket prices are cheaper and you get extended hours during weekday. Avail holiday, visit the places on a weekday rather than a weekend
  3. Discount Coupons – Websites like groupon offers lots of local deals. Make it a habit to check  such websites, look for discounts, deals before you make visit
  4. Water –  You might manage using soft drinks. Kids need water. As such water is really expensive inside. Carry little water bottles during visit. This saves good amount of money

RMAN log file location dba interview questions

RMAN the oracle recovery manager is the backup solution that comes as part of oracle software. As with all other utilities oracle RMAN has the provision to log the commands being run, status of the commands onto logfile. Here are some real-time dba interview questions you can expect on rman log file location
1) Is the rman logfile created by default during command run?
Nope. In case of RMAN logfile location needs to be specified explicitly. We make use of RMAN parameter log=’filename’ to specify the file onto which the commadn run details need to be logged
2) What is the file specified does not exist physically?
RMAN creates this file during the job run.
3) What happens when there is an issue with opening the file?
If for some reason RMAN could not open this file, then output is written onto standard output. This makes sure RMAN is safe and is not impacted owing to this
4) What is view that records log information on rman?
v$rman_output is the in-memory view that records information during job run
If for some reason there has been database restart then we can rely on v$rman_Status view
5) Why is v$rman_Status used after database restart?
This view relies on controlfile information that is not erased from memory as part of restart
6) What happens if no logfile is specified?
Command run details are logged onto standard output

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ORA-00439 online index rebuild

I installed an Oracle Database Standard Edition recently and I tried rebuilding index online. I got the following error – ORA-00439: feature not enabled: Online Index Build
Rebuild Online works only in Enterprise Edition.
SQL> alter index manualtindex rebuild online tablespace autosegments;
alter index manualtindex rebuild online tablespace auto segments
*
ERROR at line 1:
ORA-00439: feature not enabled: Online Index Build
Best possible alternative in Standard Edition is to use REBUILD option instead of REBUILD ONLINE
SQL> alter index manualtindex rebuild;
Index altered.
By default online index rebuild online is available as part of enterprise edition. If you have enterprise license, it would be appropriate to make use of it for using such interesting features as part of license
What is the main advantage of index rebuild online?
As the clause suggests index rebuild is completely online. Oracle waits for current DML to complete on tables and associated indexes, acquires lock for short timeframe, rebuilds indexes
Let’s say the indexes are corrupt in a tablespace. To fix the corruption it might be necessary to rebuild the indexes, perform export and import of database using datapump in extreme cases.
Both the above fixes demand downtime if not maximum with datapump, minimal in case of complete drop and recreation of indexes (or) index rebuild as an attempt to fix corruption
If we have REBUILD ONLINE in place an attempt can be made to rebuild indexes online with minimal downtime

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What is covered in HL7 FHIR Training?

HL7 the healthcare standard consortium offers online training program on FHIR standard. This training comes with unique opportunity of gaining knowledge on HL7 FHIR as well as applying the FHIR knowledge in the form of hands-on training

This is a four week online course covering the following topics:
1) In-depth overview of HL7’s newest standard Fast Healthcare Interoperability Resources aka FHIR
2) Hands-on training covering details on implementing HL7 FHIR

What do you get upon course completion?
Once you complete this training program you will be able to:
1) Read FHIR specification
2) Learn details on how FHIR is organized
3) Understand what an FHIR resource. Read and write FHIR resource
4) Understand interoperability paradigm supported by FHIR
5) Understand use of use of controlled vocabularies, master files, and entity registries in FHIR
6) Learn FHIR profiles and constraints, and the use of extensions
7) REST in FHIR, FHIR documents, transactions and messaging

What is the mode of this training?
This is a web based online training. This is an online instructor-led training program. Here are the unique advantages of this course:
Instructors are HL7 subject matter experts and working professionals who help you step-by-step
Course contect is accessed online
Discussion forums supporting collaboration
Quizzes to test the knowledge gained
Feedback on each module from HL7 experienced tutors

What is the pre-requisite needed to attend this training program?
FHIR is a latest standard from HL7. No prior knowledge of HL7 or FHIR is needed
Familiarity with XML or JSON recommended not mandate
Software development experience comes handy

How do I register for this course?
Send emailto eLearning@HL7.org
Course pricing details:
$800 for Members
$1200 for Non Members
$400 for Lower Income Economies as determined by the WorldBank as in data.worldbank.org/country
What are the upcoming course dates?
August 4 – 31
October 6 – 27
November 10 – December 8

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Know importance of v$sysaux_occupants

SYSAUX tablespace is the auxillary tablespace that has been introduced ever since oracle 10g. This is an alternative tablespace to SYSTEM tablespace and component proprietory tablespace used for storing the specific components
Oracle enterprise manager repository used to have its own tablespace called OEM_REPOSITORY. Some other database components like oracle text, oracle spatial have been stored in SYSAUX tablespace instead of SYSTEM tablespace. In my personal experience, datapump will not function if there are some corruption in SYSAUX tablespace. Henceforth, Datapump utility depends on SYSAUX as well
Now, let us see the importance of v$SYSAUX_occupants :
It is to be noted that details on owner, component_name, space utilization are stored in this view
This will help us determine space utilization and we can allocate more space if need be
Is there a way t move the component out of this tablespace?
Yes. Components and procedure needed to move the component out of tablespace can be obtained using move_procedure column of v$sysaux_components view
Not all components eat up all the space. Some components like Oracle Text repository is something that needs to be monitored properly for growth

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External file access oracle dba interview questions

Oracle dba will be expected to be knowing ways and means to handle external files. Scope of a DBA does not stop at the database level. DBA will need to know ways and means to create, manage external files, its interaction with database etc. There will be definitely some interview questions in this topic
1) How do you create output of a query in html report format?
set markup html on
spool outputfile.html
sql query whose output is needed # select * from dual; Say
spool off
set markup html off
2) How to get query output in text format?
spool output.txt
select * from dual; #sample
spool off
3) Is there an oracle supplied PL/SQL package to manage external file?
UTL_FILE package contains the features needed to open file, write content to it, close file
DBMS_OUTPUT is another package to collect diagnostics information, error messages, write information etc during report generation
4) How is an external binary file referenced?
Create a physical directory at operating system level, create a directory path reference at the oracle database. BFILE datatype can be used as a pointer to access external data
5) How are C++/Java codes supported?
Oracle database makes data exchange possible using DBMS_PIPE

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