DBA_TABLESPACE_USAGE_METRICS

DBA_TABLESPACE_USAGE_METRICS describes tablespace usage metrics for all types of tablespaces, including permanent, temporary, and undo tablespaces.

Column	Datatype	Description
`TABLESPACE_NAME`	`VARCHAR2(30)`	Tablespace name
`USED_SPACE`	`NUMBER`	Total space consumed by the tablespace
`TABLESPACE_SIZE`	`NUMBER`	Total size of the tablespace
`USED_PERCENT`	`NUMBER`	Percentage of used space, as a function of the maximum possible tablespace size