ORA-17688
Object store file physical size is unexpected.
Cause
While writing to an object store file, one of the file segments is being read and its size is not expected. This can be caused by multiple clients writing to the same object store file at the same time.
Action
Check for multiple clients writing to the same object store file concurrently. Change the name of the object store file to ensure a unique file name for each running job. The Oracle Cloud Infrastructure (OCI) object store service provides event logs which can be enabled in the OCI console. These logs can then later be reviewed to identify from where read or write events are originating. This error will generate trace logs which can also be reviewed to confirm interference while writing to an object store file.