_________ in connection pools helps to identify and replace connections that are no longer viable.
- Expiration
- Monitoring
- Replacement
- Validation
Validation in connection pools helps to identify and replace connections that are no longer viable or have become stale.
During peak usage, a web application's response time degrades significantly. Which connection pool setting should be investigated?
- Connection Timeout
- Max Connections Per Partition
- Min Pool Size
- Partition Count
To address degraded response time during peak usage, investigate the Max Connections Per Partition setting, which controls the maximum number of connections allowed in each partition.
What is the primary advantage of using a PreparedStatement in JDBC?
- PreparedStatements are faster than Statement objects.
- PreparedStatements are used for executing stored procedures.
- PreparedStatements help prevent SQL injection attacks.
- PreparedStatements require a connection pool.
PreparedStatements are precompiled SQL statements that are faster than Statement objects, providing better performance in JDBC operations.
What is a common strategy for handling the situation when all connections in the pool are in use?
- Automatically create more connections
- Ignore the situation
- Terminate the application
- Wait for a connection to become available
Waiting for a connection to become available is a common strategy, ensuring that the application doesn't crash when all connections in the pool are in use.
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.
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.
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.
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.
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 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.