適用於:Microsoft Fabric 中的 SQL ServerAzure SQL 資料庫 Azure SQL 受控執行個體 SQL 資料庫 傳回指定 geometry 執行個體的近似值。 在執行個體上以所指定容錯執行 Douglas-Peucker 演算法的延伸模組,即可產生該近似值。語法複製 .Reduce ( tolerance ) 引...
Databricks SQL Databricks Runtime 使用自定义聚合器聚合数组中的元素。 此函数是聚合函数的同义词。 语法 reduce(expr, start, merge [, finish] ) 自变量 expr:一个ARRAY表达式。 start:任意类型的初始值。 merge:用于聚合当前元素的 lambda 函数。
There are specific but uncommon scenarios when one-time or periodic index maintenance may be needed in Azure SQL Database and Azure SQL Managed Instance: To increase page density and reduce used space in the database, and thus stay within the size limit of the pricing tier. This avoids havin...
Applies to:SQL ServerAzure SQL Database Database Engine Tuning Advisor relies on the query optimizer to analyze a workload and to make tuning recommendations. Performing this analysis on the production server adds to the server load and can hurt server performance during the tuning session. Y...
He worked several years with the Hadoop ecosystem and with No-Sql technologies like Cassandra and HBase. Mikael can be reached at Mikael.Sitruk@outlook.com Mark Staveley is a Senior Programmer with Azure’s Big Compute Team. Prior to moving to Azure, Mark was part of Microsoft Research (...
Applies to:SQL ServerAzure SQL Database Database Engine Tuning Advisor relies on the query optimizer to analyze a workload and to make tuning recommendations. Performing this analysis on the production server adds to the server load and can hurt server performance during the tuning session. You ...
Azure SQL Database serverless automatically scales compute based on workload demand and bills for compute used per second. In the General Purpose tier, serverless also provides an option to automati...Show More Updated Oct 08, 2024Version 2.0 azure s...
适用于:SQL ServerAzure SQL 数据库 数据库引擎优化顾问依赖于查询优化器分析工作负载并提供优化建议。 在生产服务器上执行此分析会增加服务器负荷,并且可能会在优化会话过程中影响服务器的性能。 通过除了使用生产服务器以外,再使用一台测试服务器,可以减小在优化会话过程中对服务器负...
Read Committed Snapshot (RCSI) READ_COMMITTED_SNAPSHOT 数据库选项设置为 ON(Azure SQL 数据库中的默认设置)时,READ COMMITTED 隔离级别使用行版本控制来提供语句级读取一致性。 读取操作只需要架构稳定性 (Sch-S) 表级别的锁,不需要页锁或行锁。 即,数据库引擎使用行版本控制为每个语句提供一个在...
as well as SQL experts learn how to understand the benefits of Azure SQL. Since SQL Server and Azure SQL share the same engine, these new set of tools builds upon familiar content. This means SQL Server professionals can becomeAzure SQLprofessionals with just a little bit of help, such a...