RMAN Backup Perfroms Poorly using Native Async IO
(Doc ID 468598.1)
Last updated on OCTOBER 28, 2019
Applies to:Oracle Database - Enterprise Edition - Version 10.2.0.3 and later
RMAN backups are running extremely slowly.
Native async IO is being used.
Tests of a backup validate confirm that most of the time is spent READING the input files.
If async io is simulated by using disk io slaves, then backup speed is very fast.
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