Recently started seeing this error on few of the RAC environments.
ORA–00600: internal error code, arguments:[KDZA_CHECK_EQ NOT IN DICTIONARY]
As per metalink this is a known Bug 24818566
Patch 24818566: SQLLOAD FAILED WITH ORA-600 [KDZA_CHECK_EQ NOT IN DICTIONARY]
I’ve seen this in 11204 ,12102,12.2 both. As per Oracle it’s fixed in version 18.1
