How to check my use (data size) of Oracle XE?

The maximum is 4G, right? How will I know how much there is to the left of sqlplus? Thank you very much!

Also, if I use the space, can I backup my DB and empty for later use?

Here are a few queries dictionary to find the space used and who owns the blocks...

select a.tablespace_name ts, a.file_id,
sum(b.bytes)/count(*) bytes,
sum(b.bytes)/count(*) - sum(a.bytes) used,
sum(a.bytes) free,
nvl(100-(sum(nvl(a.bytes,0))/(sum(nvl(b.bytes,0))/count(*)))*100,0) pct_used
from sys.dba_free_space a, sys.dba_data_files b
where a.tablespace_name = b.tablespace_name and a.file_id = b.file_id
 and a.tablespace_name not in ('SYSTEM', 'SYSAUX','UNDOTBS')
group by a.tablespace_name, a.file_id
order by 1

System, sysaux cancellation are not supposed to count towards 4G. To display totals by schema...

select OWNER, TABLESPACE_NAME, sum( BYTES ) from dba_segments
 where tablespace_name not in ('SYSTEM', 'SYSAUX','UNDOTBS')
group by OWNER, TABLESPACE_NAME;

If you are bumping into the limit of 4G and you decide one of these owners can be trashed, which will certainly free up space.

drop user [username] cascade;

Check the export and datapump utilities docs, save a username is to do an OWNER = user name of dump or simply close the database and make a backup of data files some safe place.

Tags: Database

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