ORA-01658: unable to create INITIAL extent for segment in tablespace TS_DATA
When i tried to create a table in my User_DB schema i am getting an error as ORA-01658: unable to create INITIAL extent for segment in tablespace TS_DATA . I run the following query to get all the TABLESPACE_NAME : SELECT * FROM DBA_DATA_FILES; But i really dont know which tablespace i am using and how to extend the tablespace to solve this issue. As the error message indicates, you're using the TS_DATA tablespace. You can extend it by either enlarging one of the existing data files: ALTER DATABASE DATAFILE 'C:\ORACLEXE\APP\ORACLE\ORADATA\XE\TS_DATA.DBF' RESIZE 3000M; Or by adding a second