Ssis-661 ((top)) May 2026
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Ssis-661 ((top)) May 2026

Here are a few questions to help me get started:

3.3. Check SQL Server Service Account vs. Execution Account

If you’re launching the package via DTExec from a command line, run:

If you're still experiencing issues or have further questions, please provide more context or details about your specific scenario, and I'll do my best to assist you. SSIS-661

6️⃣ Verification & Testing

6.1. Quick “Smoke Test” After Fix

USE SSISDB;
DECLARE @execution_id BIGINT;

4️⃣️ 4.2. Use a Credential + Proxy (SQL Agent)

If the package runs from an Agent job, create a proxy that runs under the Windows account that already has the proper SSISDB rights.

Title: SQL Server Integration Services (SSIS): A Comprehensive Overview Here are a few questions to help me get started: 3

Best practice: If you have the ability to modify the destination schema, the Unicode‑to‑Unicode approach is the safest long‑term solution.

Could you please clarify the context of SSIS-661? For example: 6️⃣ Verification & Testing 6

Understanding and Resolving SSIS‑661: “Data Flow Component Fails When Using Unicode Characters”

TL;DR

SSIS‑661 is a known bug that causes the Data Flow Task to crash (or silently drop rows) when a source column containing Unicode characters is mapped to a destination column that is defined as non‑Unicode (e.g., DT_STR). The issue typically surfaces in SQL Server Integration Services 2016–2022 when the source is Oracle, MySQL, or a flat‑file encoded in UTF‑8/UTF‑16.