Ssis-834 Jun 2026

| Step | Description | SSIS Component / T‑SQL | |------|-------------|------------------------| | | Control Table – Add/extend dbo.ETL_LoadLog (if not present). Store LastLoadTimestamp per package. | T‑SQL CREATE TABLE | | 2 | Hash Column – Ensure source table has a persisted computed column HashCheck (e.g., CHECKSUM(*) ). If missing, add it. | ALTER TABLE dbo.Sales_Transactions ADD HashCheck AS CHECKSUM(*) PERSISTED; | | 3 | Lookup – In the Data Flow, use a Lookup (full cache) on the target fact table keyed by TransactionID . Return the existing HashCheck . | SSIS Lookup | | 4 | Conditional Split – Split rows into three streams: • New (no match) • Changed (match but HashCheck differs) • Unchanged (match & same hash – discard). | SSIS Conditional Split | | 5 | Destination – Use OLE DB Destination with Fast Load for New rows (INSERT) and a OLE DB Command for Changed rows (UPDATE). | SSIS OLE DB Destination / OLE DB Command | | 6 | Row Count – Capture rows inserted/updated via Row Count transform and map to variables for logging. | SSIS Row Count | | 7 | Transaction – Wrap the whole Data Flow in a Package‑Level Transaction ( TransactionOption = Required ). Enable ForceExecutionResult = Success only after commit. | SSIS Package Properties | | 8 | Logging – Add Execute SQL Task at the end to write final status/counts to ETL_LoadLog . On failure, write to ETL_ErrorLog . | Execute SQL Task | | 9 | Parameterization – Use Project Parameters for source/target connection strings, and for the LastLoadTimestamp variable (read from ETL_LoadLog ). | SSIS Project Params | | 10 | Testing – Create a Test Harness SSIS package that seeds the source with a known set of rows, runs the package, and asserts expected row counts using Data Flow Script Task (C#). | C# Script Task + SQL scripts |

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