A number of the most necessary matters in Oracle Interview questions are SQL, date, inbuilt operate, saved process, and fewer used options like a cursor, set off, and views. These questions additionally give an concept concerning the codecs of questions requested through the Oracle Interview.
Oracle Interview Questions and Solutions
Query 1: Oracle model 9.2.0.4.0 what does every quantity refers to?
Reply : oracle model quantity refers
- 9-Main database launch quantity
- 2-Database Upkeep launch quantity
- 0-Software server launch quantity
- 4-Part Particular launch quantity
- 0-Platform particular launch quantity
Query 2: How do you discover present date and time in oracle?
Reply: This is without doubt one of the steadily requested Oracle Interview questions. I’ve seen this query every so often. By the way in which SYSDATE operate is utilized in oracle to seek out present date and time of the working system on which the database is operating return kind of operate is DATE
Syntax:
SELECT TO_CHAR (SYSDATE, 'MM-DD-YYYY HH24:MI:SS') "Current_Date" FROM DUAL.
Query 3: Write the syntax to seek out the present date and time in format “YYYY-MM-DD”.
Reply:
SELECT TO_CHAR (SYSDATE, 'YYYY-MM-DD HH24:MI:SS') "Current_Date" FROM DUAL
Query 4: How will you change a date to char in Oracle give one instance
Reply: Just like the earlier Oracle Interview query, that is additionally one of many well-liked questions in varied Oracle Interviews. to_char() operate is used to transform date to the character we will specify format additionally by which we would like the output.
SELECT to_char( to_date('11-01-2012', 'DD-MM-YYYY') , 'YYYY-MM-DD') FROM twin;
or
SELECT to_char( to_date('11-01-2012, 'DD-MM-YYYY') , 'DD-MM-YYYY') FROM twin
Query 5: What’s bulk copy or BCP in oracle?
Reply: BCP or bulk copy instrument is one kind of command line instrument for unload knowledge from database got here into existence after oracle 8 .it’s used to import or export knowledge from tables and views but it surely is not going to copy construction of knowledge similar. Fundamental benefit is quick mechanism for copying knowledge and we will take backup of necessary knowledge simply.
Query 6: What are the extensions utilized by oracle stories
Reply : Oracle stories are used to make enterprise allow to supply data of all degree inside or outdoors in safe method. REP file and RDF file extensions are utilized by oracle report.
Query 7: What’s Save Factors in Oracle database?
Reply : SAVE POINTS are used to divide a transaction into smaller components. It permits rolling again a part of a transaction. Most of 5 save factors are allowed. Each time we encounter error we will rollback from the purpose the place we set our SAVEPOINT.That is helpful for multistage transaction and conditional transaction the place commit and rollback rely upon sure situation. That is one other generally requested Oracle Interview Query and since save factors are additionally obtainable in different database e.g. SQL Server, a while Interviewer observe up with variations with different database as effectively.Query 8: How will you change string to a date in oracle database?
Reply : This Oracle Interview questions is a while requested as observe up of earlier Oracle Interview questions associated to changing date to char in Oracle. By the way in which to_ date operate is used to transform string to a date operate.
Syntax : to_date(string, format)
Instance:
to_date('2012/06/12', 'yyyy/mm/dd') It would return June 12, 2012
Query 9: What’s hash cluster in Oracle?
Reply : That is certainly one of my favourite Oracle Interview query. Hash cluster is without doubt one of the strategies to retailer the desk in a hash cluster to enhance the efficiency of knowledge retrieval .we apply hash operate on the desk row’s cluster key worth and retailer within the hash cluster. All rows with the identical hash key worth are shops collectively on disk.key worth is similar like key of index cluster ,for knowledge retrieval Oracle applies the hash operate to the row’s cluster key worth.
Query 10: What’s Snap shot in Oracle database?
Reply : Snapshots are read-only copies of a grasp desk positioned on a distant node which is periodically refreshed to replicate adjustments made to the grasp desk.
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