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- Question
Explain Data Definition Language
- Correct Answer
- Data Definition Language (DDL):- are the SQL statements that define the database structure Example: CREATE ALTER DROP TRUNCATE COMMENT RENAME
- 1. What is XPath? Discuss
- 2. What is the purpose of SQL Profiler in SQL server? Discuss
- 3. Count function in SQL returns the number of
Options- A. groups
- B. values or rows
- C. columns
- D. distinct values Discuss
- 4. A relational database developer refers to a record as
Options- A. a relation
- B. an attribute
- C. a criteria
- D. a tuple Discuss
- 5. A Transparent DBMS
Options- A. Keep its logical structure hidden from users
- B. Can access control
- C. Keeps its physical structure hidden from users
- D. Can not hide sensitive information from users Discuss
- 6. What is Log Shipping? Discuss
- 7. What is the difference between a Local and a Global temporary table? Discuss
- 8. Which command is used to return maximum value from result set?
Options- A. MAX
- B. MIN
- C. MAXIMUM
- D. MAXI Discuss
- 9. A column defined as UNIQUE can contain Nulls while a column defined as PRIMARY KEY can't contain Nulls
Options- A. TRUE
- B. FALSE Discuss
- 10. Foreign key in DBMS is Discuss
Oracle Certification problems
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Correct Answer: XPath is an expressions to select a xml node in an XML document It allows the navigation on the XML document to the straight to the element where we need to reach and access the attributes
Correct Answer: SQL profiler is a tool to monitor performance of various stored procedures It is used to debug the queries and procedures Based on performance, it identifies the slow executing queries Capture any problems by capturing the events on production environment so that they can be solved
Correct Answer: values or rows
Explanation:
Count function in SQL returns the number of values or rows.
Correct Answer: a tuple
Explanation:
A relational database developer refers to a record as a tuple.
Correct Answer: Keeps its physical structure hidden from users
Explanation:
DBMS :: Database Managemet System.
A DBMS which keeps its physical structure hidden from the user is known as a transparent DBMS.
Correct Answer: Log shipping defines the process for automatically taking backup of the database and transaction files on a SQL Server and then restoring them on a standby/backup server This keeps the two SQL Server instances in sync with each other In case production server fails, users simply need to be pointed to the standby/backup server Log shipping primarily consists of 3 operations: Backup transaction logs of the Production server Copy these logs on the standby/backup server Restore the log on standby/backup server
Correct Answer: Local : Only available to the current Db connection for current user and are cleared when connection is closed Multiple users can?t share a local temporary table Global: Available to any connection once created They are cleared when the last connection is closed Can be shared by multiple user sessions
Correct Answer: MAX
Explanation:
MAX command is used to return maximum value from result setMAX
Correct Answer: TRUE
Explanation:
Because a table can have only one primary key
Correct Answer: Foreign keys are the columns of a table that points to the primary key of another table They act as a cross-reference between tables In detail : A Foreign key is a field (or collection of fields) in one table that uniquely identifies a row of another table or the same table In simpler words, the foreign key is defined in a second table, but it refers to the primary key or a unique key in the first table
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