Ssis-661 ✨

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6. Future‑Proofing Your ETL Pipelines

1. Adopt Unicode‑Native Design

   • Define all staging tables with NVARCHAR.
   • Keep the final target as VARCHAR only when you are certain the source data is pure ASCII/Latin‑1.

2. Add a Validation Step

   • Use a Script Task (or T‑SQL TRY_CAST) to scan the source for characters outside the target code page before the Data Flow runs.
   • Log any offending rows to a QC table for manual review.

3. Enable SSIS Logging & Event Handlers

   • Turn on Package Logging (OnError, OnWarning).
   • Capture the SourceName, MessageText, and ErrorCode; filter for 0xC020901C to automatically alert the team.

4. Automated Unit Tests

   • Use SSIS Unit Test frameworks (e.g., SSISTest, tSQLt) to assert that a sample payload containing Unicode characters does not cause package failure.

5. Monitor the SSIS Catalog

   • Query catalog.operation_messages after each execution to ensure there are no hidden warnings about data loss.

6️⃣ Verification & Testing

1️⃣ What is “SSIS‑661”?

| Item | Description | |------|-------------| | Error number | 661 | | Message text | “The user does not have the necessary permissions to perform this action.” | | Typical sources | - Deploying a package to the SSIS Catalog (SSISDB)
- Executing a package that accesses a secured data source (e.g., Azure Blob, SQL Server, Oracle)
- Using the SSISDB stored procedures (e.g., catalog.create_project, catalog.start_execution)
- Running a package from DTExec / DTExecUI under a Windows account lacking required rights | | Why it matters | SSIS runs with the security context of the SQL Server service account, the SQL Agent proxy, or the Windows user you launch it under. If that identity can’t read/write to the Catalog, or can’t access external resources, the package aborts with error 661. |

3. How to reproduce the error (quick test)

1. Create a simple package with an OLE DB Source that reads SELECT ColumnA, ColumnB FROM dbo.SampleTable.

2. Deploy the package to a test folder.

3. Alter the source table – change ColumnB from int to bigint or rename it.

4. Run the package again.

5. You will see:

   SSIS package "MyPackage.dtsx" started.
   [Data Flow Task] Error: SSIS-661...
   

Step 6 – Harden the package against future drift (optional but recommended)

| Technique | How to implement | |-----------|-----------------| | Schema validation at the start of the package | Add an Execute SQL Task that runs SELECT TOP 0 * FROM dbo.Table and checks sys.columns via a script task; raise an error if a mismatch is detected. | | Version‑controlled source objects | Keep a DDL script in source control and enforce a build‑time check that the production object matches the script. | | Explicit column list in all sources | Never use SELECT *. | | Package‑level data‑type constraints | Use the Data Flow → Advanced → Data Type property to lock a column to a specific type. | | Deploy with “ValidateExternalMetadata = False” (cautiously) | In scenarios where you know the schema will change but you want the package to continue, set the property on the component, but be aware you lose early detection. | | Continuous Integration (CI) testing | Add a step in your CI pipeline that runs the package against a test copy of the production database and fails the build on any SSIS‑661 (or other) error. | SSIS-661

1. What Is SSIS‑661?

| Attribute | Value | |-----------|-------| | Bug ID | SSIS‑661 (internal Microsoft tracking number) | | Affected components | OLE DB Source, Flat File Source, ADO.NET Source, Data Conversion, Derived Column | | Symptom | Package fails with error “The conversion from data type Unicode string to non‑Unicode string resulted in a loss of data.” or the task hangs when the pipeline processes rows that contain characters outside the ASCII range (e.g., “é”, “ß”, “汉”). | | First observed | SQL Server 2016 SP2, but reproduced on 2017, 2019, and 2022 RTM builds | | Severity | High – data loss can go unnoticed in large‑scale ETL jobs |

Bottom line: SSIS‑661 is a data‑type conversion bug that mishandles Unicode → non‑Unicode casts when the underlying provider (ODBC/OLE DB) returns UTF‑16 strings but the SSIS metadata expects ANSI (DT_STR). The engine incorrectly assumes that the length of the target column is sufficient, leading to buffer overruns or silent truncation.

Step 4 – Resolve the mismatch

| Fix type | When to use | What to do | |----------|------------|------------| | Refresh the component | Schema changed in source, same environment | Right‑click the component → Refresh (or click Validate). This forces SSIS to re‑pull the external metadata. | | Re‑configure the component | Column added/removed, data‑type change | Open the component → Columns tab → remove the old column, add the new one, or adjust the data‑type mapping. | | Update downstream components | Any change cascades to downstream components (e.g., OLE DB Destination, Derived Column) | Repeat the Refresh on each downstream component; if column names change, you may need to re‑map them. | | Use explicit column list instead of SELECT * | Dynamic queries cause hidden drift | Change the source query to list the columns explicitly, e.g., SELECT ColumnA, ColumnB FROM dbo.SampleTable. | | Add a Data Conversion component | Source type changed to a larger type that downstream components cannot handle (e.g., bigint → int) | Convert the column to the expected type before it reaches the failing component. | | Parameterize the query properly | Query built with expressions that may change the schema | Ensure the expression always returns the same column list, or move the query logic to a stored procedure with a stable result set. | | Re‑deploy the package after a full validation | Corrupted metadata cache | In SSDT, right‑click the project → Build → Deploy. Make sure the target server has the latest package version. | | Create a new connection manager (if connection string changed) | Different server/DB version (e.g., SQL 2008 → SQL 2019) | Delete the old connection manager, add a new one, and re‑wire the components. |

4. Immediate Work‑Arounds (No Patch Required)

| Work‑Around | Steps | Pros | Cons | |------------|-------|------|------| | Force Unicode End‑to‑End | - Change destination column to NVARCHAR (or NVARCHAR(MAX) for staging).
- Or, in the Data Flow, add a Data Conversion component and convert the source to DT_WSTR (same length as source) before the destination. | Guarantees no data loss.
Simple to implement. | Requires schema change on destination (may not be feasible in production). | | Explicit Code Page Conversion | - In the Flat File Connection Manager, set Code Page to 65001 (UTF‑8) and ensure the destination column is VARCHAR.
- Add a Derived Column with TRIM( (DT_STR, 50, 1252) [UnicodeColumn] ). | Keeps destination as non‑Unicode; works for most Latin‑1 characters. | Still fails for characters outside the chosen code page (e.g., Asian scripts). | | Pre‑load Staging Table | - Load the source into a temporary staging table with all columns as NVARCHAR.
- Use a set‑based T‑SQL INSERT … SELECT to move data to the final table, letting SQL Server handle the conversion (it raises an error if data is lost). | Leverages SQL Server’s robust conversion logic. | Adds an extra step & temporary storage. | | Script Component (C#) Conversion | - Replace the Data Flow’s built‑in conversion with a Script Component.
- Use Encoding.UTF8.GetBytes() and Encoding.Default.GetString() to control how characters are dropped or replaced (e.g., replace with “?”). | Full control over conversion policy. | Requires custom code; harder to maintain. | | Upgrade to the Latest SSIS CU | - Install the Cumulative Update (CU) that contains KB‑xxxxxx (see next section). | Fixes the bug at the engine level. | May require a full build/re‑deployment of the SSIS catalog. | I’m unable to generate content related to specific

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