ValueLabs SQL Server Developer Interview Questions and Answers

SQL DMVs are dynamic management views that provide information about the current state of a SQL Server instance for performance tuning.

• DMVs can be used to identify performance bottlenecks, monitor resource usage, and troubleshoot issues.

• Examples of commonly used DMVs include sys.dm_exec_query_stats, sys.dm_os_wait_stats, and sys.dm_io_virtual_file_stats.

The greatest challenge faced during migration to cloud from on-premise DB is ensuring data security and compliance.

• Ensuring data security during transit and at rest

• Maintaining compliance with regulations and industry standards

• Minimizing downtime and ensuring data integrity

• Optimizing performance and cost efficiency in the cloud environment

Locks and latches are mechanisms used in database management systems to control access to data and ensure data integrity.

• Locks are used to control access to data by preventing multiple users from modifying the same data simultaneously.

• Latches are lightweight synchronization mechanisms used to protect data structures in memory.

• Locks can be of different types such as shared locks, exclusive locks, and update locks.

• Latche...read more

Isolation level determines how transactions interact with each other in a database.

• Isolation levels include Read Uncommitted, Read Committed, Repeatable Read, Serializable.

• Higher isolation levels provide more data consistency but may lead to more locking and potential performance issues.

• Example: Using Read Uncommitted isolation level allows reading uncommitted data, while Serializable ensures data integrity but may lea...read more

A service account is a special account used by a service or application to access resources on a network.

• Service accounts are used to run services or applications with the necessary permissions and access rights.

• Service accounts are often used in database administration to allow the database service to interact with the operating system.

• Service accounts can be configured with specific permissions and restrictions to li...read more

Replication can be configured by setting up a publication, creating a subscription, and initializing the subscription.

• Set up a publication by selecting the database objects to replicate and defining the publication properties.

• Create a subscription by specifying the subscriber server, database, and synchronization schedule.

• Initialize the subscription by generating a snapshot of the publication and applying it to the sub

Truncate is faster and cannot be rolled back, while delete is slower and can be rolled back.

• Truncate is a DDL command, while delete is a DML command.

• Truncate removes all rows from a table, while delete removes specific rows based on a condition.

• Truncate resets identity column values, while delete does not.

• Truncate cannot be used with a WHERE clause, while delete can.

• Truncate is faster than delete as it does not log ind...read more

Team dynamics refer to the interactions and relationships among team members that impact team performance and effectiveness.

• Effective communication is key for successful team dynamics

• Establishing clear roles and responsibilities helps avoid conflicts

• Encouraging collaboration and mutual respect fosters a positive team environment