Ssis-776 💯 Hot

(A 2,500‑word post for developers, DBAs, and integration architects)

TL;DR – SSIS‑776 is a long‑standing bug in SQL Server Integration Services (SSIS) that causes packages to crash, leak memory, or return 0xC0010009 – The XML source is not valid when processing XML files larger than ~150 MB. The root cause is a buffer overflow in the XML Source component’s internal XmlReader when the document contains deeply nested elements (> 25 levels) combined with large text nodes. The fix shipped in SQL Server 2019 CU8 (and later cumulative updates) replaces the parser with a streaming XmlReaderSettings that disables DtdProcessing and enforces a max depth of 10 k characters per node. Until you can apply the hot‑fix, the recommended work‑around is to split the XML upstream, use the Script Component (or a custom .NET parser), or switch to the XML Task in a separate Control Flow step.

Below you’ll find a complete, step‑by‑step exploration of the problem, a forensic look at the source code (as far as Microsoft has made it public), the debugging journey, the official Microsoft response, the community‑driven mitigations, and a set of best‑practice recommendations you can start applying today.

Authors:
Your Name¹, Co‑author Name², Advisor Name³

Affiliations:
š Department of Computer Science, University A
² Department of Information Systems, University B
Âł Research Lab, Company C SSIS-776

Correspondence: your.email@university.edu

| Limitation | Impact | Planned Remedy | |------------|--------|----------------| | Dependency on Azure services (Schema Registry, Key Vault) | Locks implementation to Azure ecosystem | Develop an on‑prem plugin for HashiCorp Vault and an open‑source schema registry (e.g., Con

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In other contexts, SSIS-776 might have a completely different meaning. For example:

Enterprise data ecosystems now span on‑premises relational stores, cloud‑native object stores, streaming platforms, and legacy mainframes. Traditional ETL (Extract‑Transform‑Load) solutions, including the widely‑adopted SQL Server Integration Services (SSIS), are limited by static schemas, coarse‑grained encryption, and batch‑oriented execution. These constraints lead to: TL;DR – SSIS‑776 is a long‑standing bug in

Error: 0xC0010009 at Data Flow Task, XML Source [1]: The XML source is not valid.
Error: 0xC0047062 at Data Flow Task, XML Source [1]: Unexpected end of file.
Error: 0xC004703A at Data Flow Task, XML Source [1]: An internal error has occurred.

In short: SSIS‑776 is not a configuration issue; it is a code defect that only appears under a specific combination of file size, depth, and validation settings.

| Metric | Baseline A | SSIS‑776 | |--------|------------|----------| | CPU (average %) | 68 % | 71 % | | Memory (average GB) | 12 GB | 13 GB | | Additional KV calls per 10 k rows | — | 0.8 |

The modest increase in CPU/memory is offset by the latency/throughput gains and the security guarantees.

Prerequisite: You must be on SQL Server 2022 CU15 or later, or Azure Synapse with the latest runtime update.

| Step | Action | Screenshot / Code | |------|--------|-------------------| | 1️⃣ | Open your package in SQL Server Data Tools (SSDT) 2024. | ![SSDT UI] | | 2️⃣ | Select the OLE DB Source (or ADO.NET Source) that reads from a partitioned table. | | | 3️⃣ | In the Properties window, locate DynamicPartitionPruning (under Advanced). Set it to True. | | | 4️⃣ | (Optional) If you use parameterized dates (@StartDate, @EndDate), add them to the Variables tab as you normally would – no extra work needed. | | | 5️⃣ | Deploy the package to the SSIS Catalog (/SSISDB). | | | 6️⃣ | Run the package once in debug mode. Open the Integration Services Dashboard → Execution and view the DPP event log. You should see something like:
[SSIS_DPP] Pruned partitions: 12,13,14 (out of 30 total). | | | 7️⃣ | Verify data correctness – the row count should be identical to the pre‑migration run. | | | 8️⃣ | (Optional) Turn on Data Flow Performance Counters to capture the exact I/O reduction. | |