ORA-02441

ORA-02441: Cannot drop nonexistent primary key

Cause: alter table drop primary key - primary key does not exist.

Action: None

Note: get the error in sde.log when deleting a layer without a primary key in ArcCatalog
db_sda_execute_stmt::OCIStmtExecute (2441)

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All ESRI ArcSDE errors in the blog can found at: ArcSDE Errors