数据库(database)保存有组织的数据的容器(通常是一个文件或一组文件)。 表(table)某种特定类型数据的结构化清单。 SQL 是什么 SQL(发音为字母S-Q-L或sequel)是 Structured Query Language(结构化查询语言)的缩写。SQL 是一种专门用来与数据库沟通的语言。 SQL 的扩展许多 DBMS 厂商通过增加语句或指令,
NavigationPropertyNameGenerator: A function that is used for the creation of names for navigation properties. MaxDegreeOfParallelism: A number that sets the value of the "maxdop" query clause in the generated SQL query. CommandTimeout: A duration that controls how long the server-side query is...
sqlserver.lock_escalation ( SET collect_database_name=1,collect_statement=1 ACTION(sqlserver.database_id,sqlserver.database_name,sqlserver.query_hash_signed,sqlserver.query_plan_hash_signed,sqlserver.sql_text,sqlserver.username) ) ADD TARGET package0.histogram ( SET source=N'sqlserver.data...
SQL INSERT is a fundamental query for adding one or multiple rows of data into a specific table within a database. To run the statement, you need to specify a table name and, optionally, column names with their corresponding values that you want to insert into a table. Usually, the synta...
400 PerDatabaseCMKDWNotSupported - Datawarehouse 版本不支援預覽中的資料庫層級 CMK。 400 DatabaseCreationBlockedForNonActivatedCMKServer - 啟用 CMK 的工作區會封鎖 SQL 集區建立,直到工作區啟用為止。 首先,啟用清除保護,並在工作區密鑰的 Azure 金鑰保存庫 上,將所需的許可權授與工作區受控識別, (取得、...
Applies to: SQL Server (starting with SQL Server 2008 (10.0.x)) and Azure SQL Database. Overrides the max degree of parallelism configuration option of sp_configure. Also overrides the Resource Governor for the query specifying this option. The MAXDOP query hint can exceed the value...
Start Query Tuning Assistant for database upgrades Permissions Related content Applies to: SQL Server 2016 (13.x) and later versions When migrating from an older version of SQL Server to SQL Server 2014 (12.x) or later versions, and upgrading the database compatibility level ...
Query PlansReduced the number of characters in the Description of an execution plan to 1000. The full query is available using the ellipses. Query StoreAddressed an issue where theQueries With Forced Plansreport generated the error "Couldn't connect to database", seeQuery Store report 'Queries ...
Accidentally scanning an entire table. For example, this executes an extra unnecessary database query and load a lot of unnecessary data into memory: projects=Project.all.pluck(:id)MergeRequest.where(source_project_id: projects) Instead you can just use sub-queries which perform far better: ...
For more information, seeWITH common_table_expression. NO_PERFORMANCE_SPOOL Applies to: SQL Server (starting with SQL Server 2016 (13.x)) and Azure SQL Database. Prevents a spool operator from being added to query plans (except for the plans when spool is required to guarantee valid update...