文档解释
ORA-22292: Cannot open a LOB in read-write mode without a transaction
Cause: An attempt was made to open a LOB in read-write mode before a transaction was started.
Action: Start a transaction before opening the LOB in read-write mode. Ways to start a transaction include issuing a SQL DML or SELECT FOR UPDATE command. Opening hte LOB in read-only mode does not require a transaction.
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