DBA_TS_QUOTAS

Tablespace quotas for all users

Columns
   ___________________________
 
   TABLESPACE_NAME
      Tablespace name
   USERNAME
      User with resource rights on the tablespace
   BYTES
      Number of bytes charged to the user
   MAX_BYTES
      User's quota in bytes. NULL if no limit
   BLOCKS
      Number of ORACLE blocks charged to the user
   MAX_BLOCKS
      User's quota in ORACLE blocks. NULL if no limit