How an Oracle block# is mapped to a file offset (in bytes or OS blocks)
(Doc ID 761734.1)
Last updated on AUGUST 24, 2023
Applies to:
Oracle Database - Enterprise Edition - Version 10.2.0.1 to 12.1.0.1 [Release 10.2 to 12.1]Oracle Database Cloud Schema Service - Version N/A and later
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
Information in this document applies to any platform.
Goal
This document is about how an Oracle block number is mapped to a file offset (in bytes or OS blocks) for Generic OS platforms and includes an alternate formula for specific OS platforms like AIX and HP Tru64. These are the only 2 platforms where the Volume Manager reserves space for Metadata in the Oracle datafile.
For Oracle 10g and 10gR2 there are only two platforms with logical volume Metadata on raw devices: AIX and HP Tru64.
HP Tru64 is no longer supported on Oracle 11g, so AIX is the only one in 11g.
Solution
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In this Document
| Goal |
| Solution |
| Generic Platform Formula: |
| Alternate Platform Specific Formula (i.e. AIX and HP Tru64): |