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Db_block_size Requirements For Direct IO / Concurrent IO (Doc ID 418714.1)

Last updated on FEBRUARY 02, 2022

Applies to:

Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Cloud Exadata Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Database Cloud Schema Service - Version N/A and later
IBM AIX on POWER Systems (64-bit)



Goal

Running benchmarks with Direct IO and Concurrent IO.

disk_asynch_io is set to true, filesystemio_options = setall and db_block_size=8k

Will DIO and CIO be used when the operating system uses 4k blocks and Oracle is set to 8k blocks or is it required to set the db_block_size to 4k so it matches exactly what the OS has?

Solution

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Goal
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