Which type of query optimization technique focuses on reducing the number of rows to be scanned in a database query?
- Indexing
- Partitioning
- Predicate Pushdown
- Projection Pushdown
Predicate Pushdown is a query optimization technique that focuses on reducing the number of rows to be scanned in a database query. It involves pushing down the predicates (conditions) from the outer query into the inner query, thereby filtering the rows early in the query execution process. This helps in improving query performance by minimizing the amount of data that needs to be processed.
SQL injection is a type of security vulnerability that occurs when an attacker can manipulate ____________ statements sent to a database.
- HTTP
- JavaScript
- Query
- SQL
SQL
Advanced test data generation tools often incorporate _________ algorithms to generate complex and realistic data scenarios.
- Genetic
- Iterative
- Random
- Sorting
Advanced test data generation tools often use genetic algorithms to generate complex and realistic data scenarios by mimicking natural selection processes, producing diverse and representative datasets.
____________ testing is performed to assess the database's ability to handle concurrent user requests.
- Load
- Performance
- Scalability
- Stress
Load testing evaluates the system's performance under normal and expected peak load conditions, including assessing the database's concurrent user handling.
In SQL, the "TRY...CATCH" block is used to handle ____________ that may occur during query execution.
- Compilation errors
- Logical errors
- Runtime errors
- Syntax
The "TRY...CATCH" block in SQL is used to handle runtime errors that may occur during query execution. This includes errors such as divide by zero, arithmetic overflow, and so on. The block allows for graceful handling of exceptions, enabling the program to continue executing despite encountering an error.
Database administrators often use monitoring tools to set ____________ that trigger alerts when predefined thresholds are exceeded.
- Constraints
- Indexes
- Queries
- Triggers
Monitoring tools such as triggers enable database administrators to automate the process of monitoring critical thresholds in databases. When specified conditions are met, these triggers can initiate actions like sending alerts, logging events, or executing scripts, allowing administrators to promptly address potential issues before they escalate.
Which type of testing ensures that users can access only the resources and features they are authorized to use?
- Authorization Testing
- Regression Testing
- Stress Testing
- Usability Testing
Authorization testing ensures that users can access only the resources and features they are authorized to use, based on their roles and permissions within the system. It verifies that the access control mechanisms are correctly implemented and enforced, preventing unauthorized access and protecting sensitive data.
One of the best practices in database testing is to use ____________ data for testing, which represents a typical production dataset.
- Dummy
- Real
- Sample
- Synthetic
Real data closely mimics the characteristics and volumes of actual production data, providing realistic scenarios for testing.
What is the main objective of the database testing process?
- Check for data redundancy
- Ensure data integrity
- Validate database schema
- Verify database performance
The main objective of database testing is to ensure data integrity, which means ensuring that the data stored in the database is accurate, consistent, and reliable. This involves checking for any discrepancies or errors in the data, ensuring that all constraints and rules are enforced properly, and confirming that the data is being stored, retrieved, and manipulated correctly by the database system.
In ETL testing, the process of transforming data from source to target is known as ____________.
- Conversion
- Elevation
- Migration
- Transition
ETL (Extract, Transform, Load) testing involves validating the entire process of data movement from source systems to the target data warehouse or database. The transformation stage is where data undergoes changes in structure, format, or values to meet the requirements of the target system. Thus, it is referred to as data conversion.