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Message	Score	Author	Date
Hi Guys, can you please help us ? we have a si......		Rastislav Farar	Sep 07, 2021, 13:54
You can't corrupt data killing the process or sh......		Michel Cadot	Sep 07, 2021, 14:52
Coming back to my remark about increasing parall......		Michel Cadot	Sep 07, 2021, 17:48

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Subject:	rollback taking long time oracle
Author:	Rastislav Farar, Slovakia
Date:	Sep 07, 2021, 13:54, 634 days ago
Os info:	Red Hat Enterprise Linux Server release 7.9
Message:	Hi Guys, can you please help us ? we have a situation in our production db there is a very large transaction currently rollbacking. Estimated time of run is 16 plus hours. Is there any possibility to speed up without any data corruption? we would like to avoid killing the process on OS or DB restart to avoid data corruption BR thank you in advance Rasto
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Subject:	Re: rollback taking long time oracle
Author:	Michel Cadot, France
Date:	Sep 07, 2021, 14:52, 634 days ago
Score:
Message:	You can't corrupt data killing the process or shutting down the instance, Oracle has strong mechanisms to prevent from this. Grossly, rollback will take as much time as the transaction ran. You can speed up recovery (if you choose to shutdown abort the instance) setting "fast_start_parallel_rollback" to "HIGH" and/or increasing "recovery_parallelism" and "parallel_max_servers" (the former is limited by the later). Regards Michel
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Subject:	Re: rollback taking long time oracle
Author:	Michel Cadot, France
Date:	Sep 07, 2021, 17:48, 633 days ago
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Message:	Coming back to my remark about increasing parallelism, check your IO subsystem and memory can afford it otherwise performances will (drastically) drop down. Also, obviously, concurrent processes (if there are any) will suffer because of instance recovery load. Regards Michel
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