最近在搞一个升级脚本,发现有一张业务表中的某些字段长度需要调整,直接使用alter table alter column进行修改发现修改一列要用十几分钟!!!两三个列那用时简直不能容忍啊!google了一下,相关链接参考文末stackoverflow问答。 测试环境配置 表中数据量100多万; 虚拟机4核16G内存400G硬盘; 优化步骤 1.删除修改列
sp_changearticlecolumndatatype 用于替代受支持的发布服务器类型(Oracle 和 SQL Server)之间的默认数据类型映射。 若要查看这些默认数据类型映射,请执行 sp_getdefaultdatatypemapping。 sp_changearticlecolumndatatype 仅Oracle 发布服务器支持。 针对 SQL Server 发布执行此存储过程会导致错误。 sp_changearticlecolumn...
SQL Server的变更数据捕获(Change Data Capture,CDC),就是异步捕获表数据的修改,只有很少的性能开销,可以持续的更新其他数据源,比如,将联机事务处理数据库中的持续数据变化迁移到数据仓库数据库。同时提供了侦测数据中间变化的能力。 --1.建库 create database t use t go --2.1启用变更捕获 exec sys.sp_cdc_ena...
Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance Change data is made available to change data capture consumers through table-valued functions (TVFs). All queries of these functions require two parameters to define the range of Log Sequence Numbers (LSNs) that are eligible ...
SQL Server CDC is the process of recording changes in a Microsoft SQL Server database and then delivering those changes in real-time to a downstream system.
SQL Server 匯入和導出精靈中的步驟 從Excel 匯入或匯出 將數據載入 SQL Server 或 SQL Database 將數據載入 Azure Synapse Analytics 異動數據擷取 概述 指定變更數據的間隔 判斷變更數據是否已就緒 準備查詢變更數據 建立函式以擷取變更數據 擷取並瞭解變更數據 ...
The source of change data for change data capture is the SQL Server transaction log. As inserts, updates, and deletes are applied to tracked source tables, entries that describe those changes are added to the log. The log serves as input to the capture process. T...
적용 대상: SQL Server(SQL Server 2016(13.x) SP2 CU16, SQL Server 2017(14.x) CU24 및 SQL Server 2019(15.x) CU11부터), Azure SQL Database 및 Azure SQL Managed Instance 검색 작업을 강제로 사용하여 table_name 액세스하는 선택적 매...
The remaining columns mirror the identified captured columns from the source table in name and, typically, in type. These columns hold the captured column data that is gathered from the source table. Each insert or delete operation that is applied to a source table appears as a single row ...
1.1.3 read CDC data by system functions 1.1.4 two sql server agent jobs, one for populating data from log into change table; one for cleanup process. Their creation and starting can both be configured . Sys.sp_cdc_add_job & sys.sp_cdc_drop_job ...