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Questions and Answers
What occurs in a relation when records are added or removed?
What occurs in a relation when records are added or removed?
- The number of domains changes.
- The degree of the relation is fixed but the cardinality varies.
- The cardinality of the relation is fixed but the degree varies. (correct)
- The attributes in the domain change.
What database protection technique should be employed to prioritize security over processing speed?
What database protection technique should be employed to prioritize security over processing speed?
- Integrity controls
- Backups
- Encryption (correct)
- User views
What is a composite key?
What is a composite key?
- A primary or foreign key defined by its parent keys.
- A foreign key that consists of the same attributes as the primary key from a related table.
- A primary key that consists of the first two attributes of a relation.
- A primary or foreign key that consists of two or more attributes of a relation. (correct)
What process is used to prevent the current database operation from reading or writing a data item while it is being accessed by another operation?
What process is used to prevent the current database operation from reading or writing a data item while it is being accessed by another operation?
Which of the following is NOT a characteristic of file-based database systems?
Which of the following is NOT a characteristic of file-based database systems?
What is the correct order of the database design activities?
What is the correct order of the database design activities?
Why is encryption used in a database system?
Why is encryption used in a database system?
What is the main advantage of using a database management system?
What is the main advantage of using a database management system?
What is the term that describes the management of simultaneous transactions to prevent conflicts?
What is the term that describes the management of simultaneous transactions to prevent conflicts?
When would the DBMS use a serial schedule to execute transactions?
When would the DBMS use a serial schedule to execute transactions?
What is the correct ordering of activities by assigned numbers?
What is the correct ordering of activities by assigned numbers?
What is a characteristic that applies to all types of databases?
What is a characteristic that applies to all types of databases?
What is an entity in the context of databases?
What is an entity in the context of databases?
What is white-box testing of software?
What is white-box testing of software?
Which SQL language is used to limit access to a database or its data?
Which SQL language is used to limit access to a database or its data?
What is a data dictionary?
What is a data dictionary?
Which subset of Structured Query Language (SQL) is used to perform operations such as data retrieval or deletion?
Which subset of Structured Query Language (SQL) is used to perform operations such as data retrieval or deletion?
What is the primary function of concurrency control in a database?
What is the primary function of concurrency control in a database?
Which area of database security involves maintaining access to enterprise data?
Which area of database security involves maintaining access to enterprise data?
What type of testing involves testing the software with knowledge of the underlying code?
What type of testing involves testing the software with knowledge of the underlying code?
How do you remove alteration privileges from a group of users?
How do you remove alteration privileges from a group of users?
What mechanism provides controlled access to the database through virtual tables?
What mechanism provides controlled access to the database through virtual tables?
What is the term for a database application that has entered the testing phase?
What is the term for a database application that has entered the testing phase?
Which database architecture is best suited for implementation in the World Wide Web environment?
Which database architecture is best suited for implementation in the World Wide Web environment?
What type of entity-relationship model lacks redundant data?
What type of entity-relationship model lacks redundant data?
What is a database operation that is executed as a single unit?
What is a database operation that is executed as a single unit?
Which type of tables should triggers avoid referencing?
Which type of tables should triggers avoid referencing?
What type of partitioning is suitable for reducing backup volumes?
What type of partitioning is suitable for reducing backup volumes?
What feature should be omitted from a highly available data warehouse design?
What feature should be omitted from a highly available data warehouse design?
Which two features provide fine-grained access control?
Which two features provide fine-grained access control?
Which security feature allows access control based on values in individual records?
Which security feature allows access control based on values in individual records?
What is required for instance recovery after a power outage?
What is required for instance recovery after a power outage?
What is required to accomplish instance recovery?
What is required to accomplish instance recovery?
What happens to the SKD user after the command SQL>ALTER USR skd ACCOUNT LOCK; is executed?
What happens to the SKD user after the command SQL>ALTER USR skd ACCOUNT LOCK; is executed?
In which database state would you need to be to re-create the control files?
In which database state would you need to be to re-create the control files?
What is Possession in the context of Access Management?
What is Possession in the context of Access Management?
What is an Alert in the context of IT service management?
What is an Alert in the context of IT service management?
What is the purpose of creating intermediate entities during logical database design?
What is the purpose of creating intermediate entities during logical database design?
Which process is responsible for recording relationships between service components?
Which process is responsible for recording relationships between service components?
What is the effect of the command SQL>ALTER USR skd ACCOUNT LOCK; on the objects owned by the SKD user?
What is the effect of the command SQL>ALTER USR skd ACCOUNT LOCK; on the objects owned by the SKD user?
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Study Notes
Database Concepts
- When records are added or removed from a relation, the degree of the relation varies, but the cardinality remains fixed.
- To prioritize security over processing speed, encryption protection technique should be employed.
Database Security
- Composite key is a primary or foreign key that consists of two or more attributes of a relation.
- To prevent simultaneous database operations from reading or writing a data item, the lock process is used.
- Data dictionary is metadata that is stored in tables and is only accessible by the DBMS.
Database Design
- In database design, entities are items about which information is stored.
- normalization is applied before determining entities.
- Designing user views is a later step in the database design process.
SQL and Database Management
- Data Control Language (DCL) is a subset of SQL used to limit access to a database or its data.
- REVOKE command is used to remove privileges from a user or group.
- Views provide controlled access to the database through virtual tables.
Database Architecture
- Three-tier architecture using thin client is suitable for the World Wide Web environment.
- Concurrency control is the management of simultaneous transactions to prevent conflicts.
Transactions and Control
- Serialization ensures that transactions are executed in a predictable order to prevent conflicts.
- A serial schedule is used when concurrent transactions read or write the same data structure.
- A transaction is a single unit of one or more database operations.
Testing and Quality Assurance
- White-box testing involves testing the software with knowledge of the underlying code.
Partitioning and Data Warehousing
- Range Partitioning is suitable for scenarios where older data does not need to be backed up frequently.
- Partitioning and RAC (Real Application Clusters) are features that provide high availability.
Database Administration
- Redo log files are required for instance recovery after a power outage.
- The ALTER USR command with ACCOUNT LOCK option locks a user account.
Access Management and Security
- Identity, Rights, and Access are concepts within the Access Management process.
- An alert is a warning that a threshold has been reached, something has changed, or a failure has occurred.
Database Design and Modeling
- Intermediate entities are created during logical database design to resolve complex, recursive, and many-to-many relationships.
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