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Ssis-834 Here

SSIS‑834 – Issue Investigation & Resolution Report

Document Owner: [Your Name] – SSIS Development Lead
Date: 2026‑04‑16
Status: Closed – Fixed (v2026.1)

1. Executive Summary

SSIS‑834 was reported on 2026‑02‑10 by the Data‑Warehouse team. The issue manifested as intermittent package failures when loading large fact tables (> 5 M rows) using a Data Flow Task that combined a OLE DB Source and a SQL Server Destination. The failure produced the error:

Error: 0xC0202009 at Data Flow Task, OLE DB Destination [1]: SSIS Error Code DTS_E_OLEDBERROR.  
An OLE DB error has occurred. Check the error table for more details.

Root‑cause analysis revealed a buffer‑size overflow in the OLE DB Destination caused by the “FastLoadMaxInsertCommitSize” property being set to 0 (unlimited) on a server with limited tempdb space. The package would accumulate an excessively large transaction, exhausting tempdb and causing the OLE DB error.

The fix involved setting FastLoadMaxInsertCommitSize to a sensible batch size (10 000 rows) and adding a pre‑load tempdb health check. After regression testing on the staging environment, the fix was promoted to production on 2026‑04‑04 with zero regressions. SSIS-834

10. References

| Ref # | Link / Document | |-------|-----------------| | R1 | Microsoft Docs – SQL Server Integration Services (SSIS) FastLoad Options – https://learn.microsoft.com/sql/integration-services/data-flow/fastload-options | | R2 | KB 327130 – TempDB: Best Practices for Configuration – https://support.microsoft.com/kb/327130 | | R3 | Internal Wiki – SSIS Package Design Guidelines – \\wiki\ssisdg\fastload | | R4 | JIRA Ticket SSIS‑834 – Full change‑log and discussion (restricted access). |

6. Critical Success Factors

  1. Skill Alignment – While SSIS‑834 retains the familiar visual designer for quick prototyping, the production environment relies heavily on DevOps practices (Git, CI/CD). Upskilling the data‑engineering team in containerization and YAML is essential.

  2. Governance Commitment – The power of the Unified Metadata Catalog is realized only when lineage is actively used for impact analysis, data‑quality monitoring, and audit reporting. and audit reporting.

  3. Performance Testing – Early performance tests (load, stress, chaos) should be part of the CI pipeline to avoid surprises when autoscaling triggers.

  4. Cloud‑Ready Architecture – Even on‑premises customers benefit from a hybrid model: core catalog and orchestration run on Azure, while sensitive data remains behind the firewall.

  5. Vendor Support & Community – Microsoft’s roadmap for SSIS‑834 includes quarterly feature releases and an active community forum. Engaging with this ecosystem accelerates problem solving and adoption of best practices. 6. Critical Success Factors

5. The Fix – Turning a “Low Priority” Ticket into a Heroic Patch

Ravi and Maya drafted a three‑step mitigation plan:

  1. Immediate Work‑Around – Add an Execute SQL Task before the OLE DB Source to SET FMTONLY OFF; and then SELECT TOP 0 * FROM dbo.CustomerOrders. This forces SSIS to refresh the metadata cache on every run.
  2. Long‑Term Solution – Change the Data Flow to use an ADO.NET Source instead of OLE DB. ADO.NET does not suffer from the same caching bug and gracefully handles computed columns.
  3. Patch Request – Open a Microsoft Connect issue (now the Azure Feedback portal) with the exact error messages and steps to reproduce. Include the KB reference and a request to revert the schema‑caching change for OLE DB sources.

The team applied the immediate work‑around that afternoon. The nightly batch ran cleanly for the next ten days, and the data‑quality team reported zero missing rows.

Within a week, the Azure Feedback portal logged the bug as “SSIS‑10089 – OLE DB source metadata cache does not detect newly added computed columns after cumulative update”, and Microsoft released a hotfix (KB 5044001) that restored the old behavior.

8. Deployment Timeline

| Date | Activity | |------|----------| | 2026‑03‑15 | Issue triage & root‑cause analysis completed. | | 2026‑03‑20 | Fix implemented in a feature branch (SSIS-834-fix). | | 2026‑03‑25 | Code review & QA sign‑off. | | 2026‑03‑28 | Staging deployment & regression testing. | | 2026‑04‑02 | Change‑control approval (CAB). | | 2026‑04‑04 | Production deployment (00:30 AM). | | 2026‑04‑10 | Post‑deployment monitoring (no regressions). | | 2026‑04‑12 | Documentation update released to the team. | | 2026‑04‑16 | Issue officially closed (SSIS‑834). |