SQL Server 2017 marked a significant advancement in high availability architectures by introducing the The By default, this setting is configured to 0, mirroring SQL Server 2016\u2019s behavior, where no additional synchronous secondaries are required for a commit to proceed on the primary. Administrators, however, have the discretion to modify this value to enhance data durability further, with the ceiling set at the total number of replicas minus one. It is crucial to note that this setting exclusively applies to replicas configured in synchronous commit mode.<\/p>\n The implementation of In SQL Server 2022, Configuring this setting involves utilizing the The inception of 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.<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[36,35,29,40],"tags":[38,100,30],"class_list":["post-345","post","type-post","status-publish","format-standard","hentry","category-availability-groups","category-data-integrity","category-security","category-sql-server-2022","tag-availability-groups","tag-data-durability","tag-security"],"yoast_head":"\nREQUIRED_SYNCHRONIZED_SECONDARIES_TO_COMMIT<\/code> 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.<\/p>\nUnderstanding REQUIRED_SYNCHRONIZED_SECONDARIES_TO_COMMIT<\/h3>\n
REQUIRED_SYNCHRONIZED_SECONDARIES_TO_COMMIT<\/code> setting is instrumental in specifying the minimum number of synchronous secondary replicas that must acknowledge a transaction commit before the primary replica proceeds with its own commit. This mechanism ensures that a transaction is only considered complete once it has been securely recorded across multiple replicas, substantially minimizing the risk of data loss.<\/p>\nOperational Implications<\/h3>\n
REQUIRED_SYNCHRONIZED_SECONDARIES_TO_COMMIT<\/code> intricately affects transaction management within AGs:<\/p>\n\n
SQL Server 2022: Distributed AG Lossless Failover<\/h3>\n
REQUIRED_SYNCHRONIZED_SECONDARIES_TO_COMMIT<\/code> gains additional significance in the context of Distributed Availability Groups, particularly concerning lossless failover. This configuration ensures that before committing a transaction on the primary, it is acknowledged on a specified number of secondary replicas, thus enhancing the durability and consistency of data across geographically distributed replicas.<\/p>\nConfiguring REQUIRED_SYNCHRONIZED_SECONDARIES_TO_COMMIT<\/h3>\n
ALTER AVAILABILITY GROUP<\/code> statement, wherein the desired count of synchronized secondaries is specified. For example, applying REQUIRED_SYNCHRONIZED_SECONDARIES_TO_COMMIT = 1<\/code> requires that at least one secondary replica must commit the transaction prior to the primary.<\/p>\nSQL 2022 Configuration Steps<\/h4>\n
\n
last_hardened_lsn<\/code> and synchronization_state_desc<\/code> queries to confirm that the LSNs are identical and synchronized.<\/li>\nALTER AVAILABILITY GROUP [DAG] SET (REQUIRED_SYNCHRONIZED_SECONDARIES_TO_COMMIT = 1);<\/code><\/pre>\n<\/li>\nlast_hardened_lsn<\/code>.<\/li>\nALLOW_DATA_LOSS<\/code>.<\/li>\nALTER AVAILABILITY GROUP [DAG] SET (REQUIRED_SYNCHRONIZED_SECONDARIES_TO_COMMIT = 0);<\/code><\/pre>\n<\/li>\nREQUIRED_SYNCHRONIZED_SECONDARIES_TO_COMMIT<\/code>.<\/li>\n<\/ul>\nConclusion<\/h2>\n
REQUIRED_SYNCHRONIZED_SECONDARIES_TO_COMMIT<\/code> in SQL Server 2017, and its enhancement in SQL Server 2022, underscores a sustained effort towards ensuring high data durability in availability and disaster recovery setups. By judiciously configuring this setting, database administrators can strike a meticulous balance between guaranteeing data durability and maintaining efficient system performance, customized to the nuanced requirements and architecture of their SQL Server environments.<\/p>\n","protected":false},"excerpt":{"rendered":"