What is the impact on performance when using PreparedStatement for repeated database operations?
- Decreased performance due to compilation
- Improved security with parameterized queries
- Increased performance due to query caching
- No impact on performance
Using PreparedStatement can lead to increased performance as the query is precompiled and cached, reducing database load and improving execution speed.
How can you retrieve the output of a stored procedure using CallableStatement?
- getOutput()
- getOutputParameterValue()
- getProcedureOutput()
- getResultSet()
You can retrieve the output of a stored procedure using getOutputParameterValue() method in CallableStatement, which returns the value of a designated OUT parameter after the stored procedure execution.
What method is used to execute a stored procedure using a CallableStatement?
- callProcedure()
- execute()
- executeProcedure()
- executeQuery()
The execute() method is used to execute a stored procedure using a CallableStatement.
How does PreparedStatement help in preventing SQL injection attacks?
- It automatically escapes special characters in the SQL query.
- It encrypts the entire SQL query.
- It relies on client-side validation.
- It uses parameterized queries.
PreparedStatement helps prevent SQL injection attacks by using parameterized queries, ensuring that user input is treated as data and not executable code.
What is a CallableStatement used for in JDBC?
- Executing DDL statements.
- Executing batch updates.
- Executing dynamic SQL queries.
- Executing stored procedures.
CallableStatement is used in JDBC for executing stored procedures in the database, providing a way to call database stored procedures from Java code.
How do you set a parameter in a PreparedStatement?
- Using the set() method.
- Using the setInt() method.
- Using the setParameter() method.
- Using the setParameter(int index, Object value) method.
Parameters in a PreparedStatement are set using specific methods like setInt(), setString(), etc., depending on the data type of the parameter.
In a high-load scenario, a web application is unable to obtain database connections quickly. What aspect of connection pooling should be optimized?
- Acquire Increment
- Idle Timeout
- Max Idle Time
- Min Pool Size
To optimize obtaining database connections in a high-load scenario, focus on the Acquire Increment setting, which determines how many connections are added to the pool when all connections are in use.
A web application experiences intermittent database connection issues. What connection pooling feature should be evaluated to resolve this?
- Connection Retry
- Idle Timeout
- Max Pool Size
- Min Pool Size
To address intermittent database connection issues, one should evaluate the Max Pool Size setting in connection pooling, which determines the maximum number of connections that can be created.
A __________ strategy in connection pooling helps to optimize resource utilization under varying load conditions.
- Adaptive Allocation
- Dynamic Allocation
- Incremental Allocation
- Static Allocation
An Adaptive Allocation strategy in connection pooling helps optimize resource utilization under varying load conditions.
Which SQL statement is used to start a transaction in a database?
- BEGIN TRANSACTION
- COMMIT TRANSACTION
- ROLLBACK TRANSACTION
- START TRANSACTION
The START TRANSACTION statement is used to begin a transaction in a database, marking the starting point for a series of SQL statements to be treated as a single unit.
What is the primary purpose of transaction management in database operations?
- Encrypting data
- Ensuring data consistency
- Managing user permissions
- Optimizing queries
The primary purpose of transaction management is to ensure data consistency by either committing or rolling back changes as a single, atomic operation.
In a transactional context, if one of the PreparedStatement executions fails, what should be the approach for handling this situation?
- Commit the successful executions, ignore the failure
- Continue with the next PreparedStatement
- Manually undo the changes of successful executions
- Rollback the entire transaction
In a transactional context, if one of the PreparedStatement executions fails, the appropriate approach is to rollback the entire transaction to maintain data consistency. Committing successful executions and ignoring the failure may lead to inconsistent data.