SSIs

SQL Server Integration Services (SSIS) is a platform for data integration and workflow applications that is part of Microsoft SQL Server. It provides tools and components to perform data extraction, transformation, and loading (ETL), data migration, and data integration tasks across heterogeneous data sources. SSIS packages can be developed in SQL Server Data Tools and executed by the SQL Server Integration Services runtime, either on premises or in the cloud via Azure-SSIS Integration Runtime.

A package contains a control flow that orchestrates tasks and a data flow that moves and transforms data. Tasks include operations such as executing SQL statements, sending messages, and performing file operations; data flow components connect sources to destinations, applying transformations like lookups, joins, aggregations, and data cleansing. Packages support variables, parameters, expressions, error handling, event handlers, and logging. They can be organized with containers such as sequences, loops, and transactions to manage complex workflows.

SSIS connects to a wide range of data sources and destinations using providers and connectors, including relational databases, flat files, Excel, XML/JSON, and cloud services. It supports scripting through Script Task and Script Component, enabling custom logic with C# or VB.NET. Deployment can target the SSIS catalog (SSISDB) or the file system, and execution can be scheduled with SQL Server Agent or triggered by events. Security and auditing features include project-level parameters, environments, and logging.

Historically, SSIS was introduced with SQL Server 2005 as the successor to Data Transformation Services, and has since evolved with enhancements in performance, debugging, deployment models, cloud integration, and data governance capabilities.