Oracle Certification Exam Interview Preparation Guide
Optimize your Oracle Certification interview preparation with our curated set of 25 questions. Each question is crafted to challenge your understanding and proficiency in Oracle Certification. Suitable for all skill levels, these questions are essential for effective preparation. Dont miss out on our free PDF download, containing all 25 questions to help you succeed in your Oracle Certification interview. Its an invaluable tool for reinforcing your knowledge and building confidence.25 Oracle Certification Questions and Answers:
1 :: How to create a multiple databases with the same configuration?
Applications can create multiple databases with in a single file.This is useful when database are both numerous and reasonably small in order to avoid creating a large number of underlying files.Putting multiple databases in a single physical file is an administrative convenience and unlikely to affectdatabase performance.
2 :: Explain Which two statements are true regarding working with dates? (Choose two.)
A. The default internal storage of dates is in the numeric format
B. The default internal storage of dates is in the character format
C. The RR date format automatically calculates the century from the SYSDATE function and does
not allow the user to enter the century
D. The RR date format automatically calculates the century from the SYSDATE function but allows
the user to enter the century if required?
A. The default internal storage of dates is in the numeric format
D. The RR date format automatically calculates the century from the SYSDATE function but allows
the user to enter the century if required
D. The RR date format automatically calculates the century from the SYSDATE function but allows
the user to enter the century if required
3 :: what is the difference between TRUNCATE, DELETE, DROP?
1) Drop will drop the records from the table along with its structure.All the indexes associated with it will also deleted and there is no rollback.
2) Delete will deletes the records of the table but the structure of the table is retained back.It is a DML operation which is slower but provides rollback facility.
3) Truncate is a DDL command which is faster ,retain structure of the table and rollback is possible.It allocates memory usually after truncating so structure is retained.
2) Delete will deletes the records of the table but the structure of the table is retained back.It is a DML operation which is slower but provides rollback facility.
3) Truncate is a DDL command which is faster ,retain structure of the table and rollback is possible.It allocates memory usually after truncating so structure is retained.
4 :: Explain When does a transaction complete? (Choose all that apply.)
A. When a DELETE statement is executed
B. When a ROLLBACK command is executed
C. When a PL/SQL anonymous block is executed
D. When a data definition language statement is executed
E. When a TRUNCATE statement is executed after the pending transaction
B. When a ROLLBACK command is executed
D. When a data definition language statement is executed
E. When a TRUNCATE statement is executed after the pending transaction
D. When a data definition language statement is executed
E. When a TRUNCATE statement is executed after the pending transaction
5 :: What is the difference between primary key and foreign key
Primary Key is unique Key entire the table and which is
also NOT NULL
where as foriegn key is the null & which references the
primary key .
also NOT NULL
where as foriegn key is the null & which references the
primary key .
6 :: How to use STANDBY_ARCHIVE_DEST parameter and explain its need?
STANDBY_ARCHIVE_DEST is relevant only for a standby database in managed recovery mode. It specifies the location of archive logs arriving from a primary database.
7 :: Explain What is the use of PARALLEL_ADAPTIVE_MULTI_USER initialization parameter?
When we set to PARALLEL_ADAPTIVE_MULTI_USER true enables an adaptive algorithm designed to improve performance in multiuser environments that use parallel execution. The algorithm automatically reduces the request degree of parallelism based on the degree at the system load at query startup time.
8 :: Explain Which three statements are true regarding the data types in Oracle Database 10g/11g? (Choose
two.)
A. Only One LONG column can be used per table
B. A TIMESTAMP data type column stores only time values with fractional seconds
C. The BLOB data type column is used to store binary data in an operating system file
D. The minimum column width that can be specified for a VARCHAR2 data type column is one
E. The value for a CHAR data type column is blanked-padded to the maximum defined column
width
A. Only One LONG column can be used per table
D. The minimum column width that can be specified for a VARCHAR2 data type column is one
E. The value for a CHAR data type column is blanked-padded to the maximum defined column
width
D. The minimum column width that can be specified for a VARCHAR2 data type column is one
E. The value for a CHAR data type column is blanked-padded to the maximum defined column
width
9 :: Explain Which two statements are true regarding single row functions? (Choose two.)
A. They accept only a single argument
B. They can be nested only to two levels
C. Arguments can only be column values or constant
D. They always return a single result row for every row of a queried table
E. They can return a data type value different from the one that is reference
D. They always return a single result row for every row of a queried table
E. They can return a data type value different from the one that is reference
E. They can return a data type value different from the one that is reference
10 :: What is row chaining and row migration?
We will migrate a row when an update to that row would cause it to not fit on the block anymore (with all of the other data that exists there currently). A migration means that the entire row will move and we just leave behind the. So, the original block just has the rowid of the new block and the entire row is moved.
Row chaining nstead of just having a forwarding address on one block and the data on another we have data on two or more blocks.
Row chaining nstead of just having a forwarding address on one block and the data on another we have data on two or more blocks.