QueryLight

Many production oracle database instances do not have auto incrementing tablespaces. You would need to know beforehand before users start getting ORA-01688 unable to extend tablespace errors. You would probably have some sort of monitoring on the tablespaces already , OEM shows alerts about tablespaces readily as well. But its good to have a query handy to quickly check the tablespace usages you have in your system. select df.tablespace_name ,totalusedspace "totalusedspace_mb" , (df.totalspace - tu.totalusedspace) "Free_MB", df.totalspace "Total_MB", round(100 * ( (df.totalspace - tu.totalusedspace)/ df.totalspace)) "Pct. Free" from (select tablespace_name, round(sum(bytes) / 1048576) TotalSpace from dba_data_files group by tablespace_name) df, (select round(sum(bytes)/(1024*1024)) totalusedspace, tablespace_name from dba_segments group by tablespace_name) tu where df.tablespace_name = tu.tablespace_name ;