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ORA-600 [32695] [hash aggregation can't be done] (Doc ID 729447.1)

Last updated on JUNE 06, 2019

Applies to:

Oracle Database - Enterprise Edition - Version to [Release 10.2 to 11.1]
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Information in this document applies to any platform.
***Checked for relevance on 17-Nov-2011***


When running a statement that involves a GROUP BY operation, the following error is raised:

ORA-00600: internal error code, arguments: [32695], [hash aggregation can't be done], [], [],

 If we look in the trace file, under Call Stack Trace section, we see the functions:

... qeshPartitionBuildHD qeshGBYOpenScan2 qeshGBYOpenScan qerghFetch qervwFetch ...


and the query plan for the SQL statement shows a HASH GROUP BY, eg. :


| Id | Operation                         |
| 0 | INSERT STATEMENT                   |
| 1 | PX COORDINATOR                     |
| 2 | PX SEND QC (RANDOM)                |
| 3 | HASH GROUP BY                      |


A second case where this would occur could be with a failing query that has no GROUP BY, but has a Select Distinct. The Plan table indicates a HASH UNIQUE instead of HASH GROUP BY.




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