Workday Most Frequently Asked Latest Oracle Interview Questions Answers
How Will You Monitor The Space Allocation?
By querying DBA_SEGMENT table/view
What Are The Advantages Of Views?
Provide an additional level of table security, by restricting access to a predetermined set of rows and columns of a table.
Hide data complexity.
Simplify commands for the user.
Present the data in a different perspective from that of the base table.
Store complex queries.
Can A View Based On Another View?
Yes.
Do A View Contain Data?
Views do not contain or store data.
What Is An Oracle View?
A view is a virtual table. Every view has a query attached to it. (The query is a SELECT statement that identifies the columns and rows of the table(s) the view uses.)
What Is Oracle Table?
A table is the basic unit of data storage in an Oracle database. The tables of a database hold all of the user accessible data. Table data is stored in rows and columns.
Can A Tablespace Hold Objects From Different Schemes?
Yes.
Can Objects Of The Same Schema Reside In Different Tablespaces?
Yes.
What Are Schema Objects?
Schema objects are the logical structures that directly refer to the database’s data. Schema objects include tables, views, sequences, synonyms, indexes, clusters, database triggers, procedures, functions packages and database links.
What Is Schema?
A schema is collection of database objects of a user.
Explain The Relationship Among Database, Tablespace And Data File.
Each databases logically divided into one or more tablespaces one or more data files are explicitly created for each tablespace.
Why Query Fails Sometimes?
Rollback segment dynamically extent to handle larger transactions entry loads.
A single transaction may wipeout all available free space in the rollback segment tablespace. This prevents other user using rollback segments.
How The Space Utilization Takes Place Within Rollback Segments?
It will try to fit the transaction in a cyclic fashion to all existing extents. Once it found an extent is in use then it forced to acquire a new extent (number of extents is based on the optimal size)
How Will You Create Multiple Rollback Segments In A Database?
- Create a database, which implicitly creates a SYSTEM rollback segment in a SYSTEM tablespace.
- Create a second rollback segment name R0 in the SYSTEM tablespace.
- Make new rollback segment available (after shutdown, modify init.ora file and start database)
- Create other tablespaces (RBS) for rollback segments.
- Deactivate rollback segment R0 and activate the newly created rollback segments.
What Is The Functionality Of System Table Space?
To manage the database level transactions such as modifications of the data dictionary table that record information about the free space usage.
What Is The Optimal Parameter?
It is used to set the optimal length of a rollback segment.
What Is The Role Of Pctfree Parameter Is Storage Clause?
This is used to reserve certain amount of space in a block for expansion of rows.
How Does Space Allocation Table Place Within A Block?
Each block contains entries as follows
Fixed block header
Variable block header
Row Header, row date (multiple rows may exists)
PCTEREE (% of free space for row updating in future)
What Is Public Database Link?
Public database link is created for the special user group PUBLIC. A public database link can be used when any user in the associated database specifies a global object name in a SQL statement or object definition.
What Is Private Database Link?
Private database link is created on behalf of a specific user. A private database link can be used only when the owner of the link specifies a global object name in a SQL statement or in the definition of the owner’s views or procedures.
What Are The Types Of Database Links?
Private database link, public database link & network database link.
What Is Database Link?
A database link is a named object that describes a “path” from one database to another.
How Will You Monitor The Space Allocation?
By querying DBA_SEGMENT table/view
What Are The Advantages Of Views?
Provide an additional level of table security, by restricting access to a predetermined set of rows and columns of a table.
Hide data complexity.
Simplify commands for the user.
Present the data in a different perspective from that of the base table.
Store complex queries.
Can A View Based On Another View?
Yes.
Do A View Contain Data?
Views do not contain or store data.
What Is An Oracle View?
A view is a virtual table. Every view has a query attached to it. (The query is a SELECT statement that identifies the columns and rows of the table(s) the view uses.)
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| Workday Most Frequently Asked Latest Oracle Interview Questions Answers |
What Is Oracle Table?
A table is the basic unit of data storage in an Oracle database. The tables of a database hold all of the user accessible data. Table data is stored in rows and columns.
Can A Tablespace Hold Objects From Different Schemes?
Yes.
Can Objects Of The Same Schema Reside In Different Tablespaces?
Yes.
What Are Schema Objects?
Schema objects are the logical structures that directly refer to the database’s data. Schema objects include tables, views, sequences, synonyms, indexes, clusters, database triggers, procedures, functions packages and database links.
What Is Schema?
A schema is collection of database objects of a user.
Explain The Relationship Among Database, Tablespace And Data File.
Each databases logically divided into one or more tablespaces one or more data files are explicitly created for each tablespace.
Rollback segment dynamically extent to handle larger transactions entry loads.
A single transaction may wipeout all available free space in the rollback segment tablespace. This prevents other user using rollback segments.
How The Space Utilization Takes Place Within Rollback Segments?
It will try to fit the transaction in a cyclic fashion to all existing extents. Once it found an extent is in use then it forced to acquire a new extent (number of extents is based on the optimal size)
How Will You Create Multiple Rollback Segments In A Database?
- Create a database, which implicitly creates a SYSTEM rollback segment in a SYSTEM tablespace.
- Create a second rollback segment name R0 in the SYSTEM tablespace.
- Make new rollback segment available (after shutdown, modify init.ora file and start database)
- Create other tablespaces (RBS) for rollback segments.
- Deactivate rollback segment R0 and activate the newly created rollback segments.
What Is The Functionality Of System Table Space?
To manage the database level transactions such as modifications of the data dictionary table that record information about the free space usage.
What Is The Optimal Parameter?
It is used to set the optimal length of a rollback segment.
What Is The Role Of Pctfree Parameter Is Storage Clause?
This is used to reserve certain amount of space in a block for expansion of rows.
How Does Space Allocation Table Place Within A Block?
Each block contains entries as follows
Fixed block header
Variable block header
Row Header, row date (multiple rows may exists)
PCTEREE (% of free space for row updating in future)
What Is Public Database Link?
Public database link is created for the special user group PUBLIC. A public database link can be used when any user in the associated database specifies a global object name in a SQL statement or object definition.
What Is Private Database Link?
Private database link is created on behalf of a specific user. A private database link can be used only when the owner of the link specifies a global object name in a SQL statement or in the definition of the owner’s views or procedures.
What Are The Types Of Database Links?
Private database link, public database link & network database link.
What Is Database Link?
A database link is a named object that describes a “path” from one database to another.
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