RE: DML blocking

Does the affected table have any LOBs that aren’t cached?

Best regards,

Nenad

From: oracle-l-bounce_at_freelists.org <oracle-l-bounce_at_freelists.org> On Behalf Of Pap Sent: Montag, 11. Juli 2022 11:18
To: Oracle L <oracle-l_at_freelists.org> Subject: DML blocking

• E-Mail from outside Vontobel: Do not click on links or open attachments unless you know the content is safe. *** Hi We have a customer database on version 19.11.We saw all of sudden most of the session for a INSERT query got blocked and the wait event was showing as "enq: TT - contention [mode=4]" . And the blocking session appeared to be a session executing "ALTER database sql" as below. However , wanted to know if its expected behavior to block application query doing DML on that same tablespace object or we are hitting any bug here?

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