In SQL Server, latches are lightweight synchronization mechanisms that keep in-memory data structures consistent and safe. They are key to managing access when multiple threads are working with these structures at the same time. SQL Server uses two main types of latches: buffer latches and non-buffer latches. While buffer latches protect pages in the buffer pool, non-buffer latches are for other internal memory structures. This post focuses on non-buffer latches, explaining what they are, why they’re important, and what excessive non-buffer latch waits might mean.
Category: Data Integrity
Understanding Quorum Loss in a Windows Failover Cluster with SQL Server Always On Availability Groups
This article provides an in-depth exploration of quorum loss in Windows Failover Clusters and its impact on SQL Server Always On Availability Groups. It explains how nodes communicate using heartbeat packets, the process of handling failed heartbeats, and the rejoining of nodes to the cluster. The post also outlines various quorum voting configurations and their implications for cluster stability and data integrity. Additionally, it discusses the importance of maintaining quorum for high availability and disaster recovery in SQL Server environments.
Five SQL Server Error Log Messages You Should Care About
SQL Server error logs are a treasure trove of information, containing important details about the health and performance of your database server. These logs are essential for troubleshooting issues, identifying potential problems before they escalate, and ensuring the overall stability of your SQL Server environment. By regularly monitoring and understanding the contents of these logs, database administrators (DBAs) can proactively manage their servers and avoid catastrophic failures. In this blog post, we will highlight five specific error log messages that should immediately catch your attention, explain what they mean, and outline the steps you should take when you encounter them.
Understanding SQL Server Checkpoints
In SQL Server, checkpoints are essential for maintaining data integrity and ensuring efficient recovery. During a checkpoint, changes made in memory (dirty pages) are written to disk, ensuring that the database state can be accurately recovered in the event of a failure. This process is governed by a mechanism called Write-Ahead Logging (WAL), which ensures that all log records related to changes are written to disk before the corresponding data pages.
Best Practices for SQL Server Backup and Restore Strategies
Learn the best practices for SQL Server backup and restore strategies, including full, differential, and transaction log backups, backup verification, and encryption. This guide covers the use of native SQL Server features versus third-party tools, implementing offsite and cloud backups, and establishing effective backup retention policies. Ensure successful restore processes and maintain high data availability with detailed, straightforward advice tailored for enterprise environments.
Taking Action with SQL Server Triggers: Automating Tasks for Efficiency
This post explores SQL Server triggers, a tool for automating database tasks. Learn how triggers can enforce data integrity, maintain referential integrity, and automate routine operations to enhance efficiency. The post includes practical examples and explains how to implement triggers to improve operational efficiency and compliance in database management. No previous experience with triggers is required to understand their benefits and applications.
Enterprise SQL Server Security: Best Practices and Strategies to Protect Your Data
Explore essential SQL Server security best practices for large enterprises. This blog covers encryption, access control, infrastructure security, threat detection, and compliance to enhance data protection, ensure regulatory adherence and more. Learn what more you can do to secure your critical production SQL Server environments.
Enhancing Data Durability with SQL Server’s REQUIRED SYNCHRONIZED SECONDARIES TO COMMIT Feature
SQL Server 2017 marked a significant advancement in high availability architectures by introducing the REQUIRED_SYNCHRONIZED_SECONDARIES_TO_COMMIT setting. This feature enhances data protection and integrity within Availability Groups (AGs) by meticulously controlling the transaction commit process across replicas. Its role has continued to be pivotal in subsequent releases, including SQL Server 2022, showcasing Microsoft’s commitment to robust data protection mechanisms.
Ensuring Continuous Data Capture in SQL Server Across Failovers
Discover how to configure Change Data Capture (CDC) in SQL Server to be High Availability (HADR) aware. This guide covers step-by-step instructions to ensure continuous data capture and system resilience across failovers, minimizing manual intervention and maximizing uptime.
Understanding the Implications of the TRUSTWORTHY Database Setting in SQL Server
As a SQL Server DBA, understanding the nuances of database settings is necessary for maintaining security and integrity. One such setting that often becomes a topic of discussion due to its significant impact on security is the TRUSTWORTHY database setting. The TRUSTWORTHY database setting in SQL Server is a configuration option that affects the security of certain database operations, particularly those involving code execution contexts. It plays a critical role in the security context of modules that use WITH EXECUTE AS, as well as CLR (Common Language Runtime) assemblies marked as EXTERNAL_ACCESS or UNSAFE.