How to "clean" the tablespace USERS ?

I have a user "GIS", it's tablespace is USERS, there are only two tables in this user(RASTER_DATA and RASTER_DATA_RDT).
I put some raster data in "GIS", now I delete all data(delete from RASTER_DATA), but the tablespace USERS is still 7/10GB, how to "clean" the USERS?

zhu19774279 wrote:
I have a user "GIS", it's tablespace is USERS, there are only two tables in this user(RASTER_DATA and RASTER_DATA_RDT).
I put some raster data in "GIS", now I delete all data(delete from RASTER_DATA), but the tablespace USERS is still 7/10GB, how to "clean" the USERS?When you delete a row, or all the rows, the extent that was allocated for them stays allocated. De-allocating/re-allocating extents is a fairly expensive operation, and it is assumed that if a table once needed an extent it will probably need it again, so it is not routinely de-allocated just because it is empty at the moment.

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