Shulou(Shulou.com)06/01 Report--

SQL ordered by Reads to fetch data from disk, the unit is times, if too large, IO will cause the entire database to slow down, is RAC environment, may cause the database to restart.

BEGIN SYS.KUPW$WORKER.MAIN ('SYS_EXPORT_SCHEMA_01','SYS', 0); END; ##stands for data pump backup, don't be unfamiliar.

The most physical reads above are data pumps, which have a great impact on the CPU and IO of the system, especially when we use compressed backups. This is why we are usually forbidden to run scripts when making database backups. A batch that normally takes an hour to run, while expdp may take three hours to run. I recently encountered such a situation.

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