2、dba_segments#describes the storage allocated for all segments in the database.
owner
segment_name
partition_name
segment_type *
segment_subtype # subtype of lob segment :sourcefile assm mssm and null
tablespace_name
bytes
NOTE：The next Blog describe the principles of Oracle 12C RAC .Oracle commonly uesd tables/views and processes（二）
原文：https://blog.51cto.com/11298469/2451078