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Applies to: 
SQL Server
Details
| Attribute | Value |
|---|---|
| Product Name | SQL Server |
| Event ID | 8642 |
| Event Source | MSSQLSERVER |
| Component | SQLEngine |
| Symbolic Name | EXCHNGSTART_ERR |
| Message Text | The query processor could not start the necessary thread resources for parallel query execution. |
Explanation
Thread resources are low in the server.
User Action
Reduce load on the server, and run the query again.