Percy Reyes
My thoughts on cryptography and SQL database Engineering
Friday, 20 September 2024
Is Achieving Perfect Secrecy Through Quantum Computing Feasible?
Thursday, 1 August 2024
SQL Server Internals Explained: An Introductory Guide
Understanding SQL Server's internal architecture and components, such as the Relational Engine, Storage Engine, indexes, and locking mechanisms, helps database administrators (DBAs) and developers optimise performance, troubleshoot issues, and ensure efficient data management. Each part of SQL Server, from how data is stored to how queries are processed, contributes to its overall efficiency and scalability. By diving deeper into SQL Server internals, one can make informed decisions to improve database performance and stability.
Here’s an overview of some of the key internal components and concepts of SQL Server:
Wednesday, 19 June 2024
Some common reasons why the transaction log cannot be reused automatically
Monday, 13 May 2024
Boosting SQL Server Efficiency: Why You Should Update Statistics Manually
Saturday, 20 April 2024
Detailed Explanation of SQL Server Query Hints
SQL Server query hints are directives that can be included in your SQL queries to guide the SQL Server Query Optimiser in executing them. Typically, SQL Server automatically selects the most efficient execution plan based on the query and underlying data. However, query hints enable you to override the optimiser’s default choices, giving you greater control over specific aspects of query execution.
While these hints can significantly enhance performance in particular scenarios, they must be used cautiously and strategically. Incorrect application of hints can lead to degraded performance or unpredictable outcomes. Therefore, it is essential to thoroughly test your queries both with and without hints to evaluate their impact. Ensure that hints are employed appropriately and suited to your specific workloads to achieve optimal results.
Below is a detailed look at common SQL Server query hints, examples of their usage, and the potential risks associated with each.
Monday, 4 March 2024
Understanding the SQL Server Query Optimiser: A Comprehensive Overview
The primary goals of the Query Optimiser include:
- Generating Execution Plans: The optimiser creates a roadmap that describes how SQL Server will access the data required by the query.
- Maximising Efficiency: By evaluating different potential execution paths, the optimiser selects the one that minimises resource utilisation, such as CPU, memory, and disk I/O.
- Improving Response Times: A well-optimised query results in faster execution, contributing to better overall system performance.