two ways to get the freespace in an oracle database show different values
Hello
I tried to get the freespace in a tablespace with different methods.
R: first method
1 Select tablespace_name, sum (bytes) /(1024*1024) MB dba_data_files group by tablespace_name; # to get the totalspace (divided) of storage space
TBS1 13312 MB
2. Select tablespace_name, sum (bytes) /(1024*1024) dba_segments MB group by tablespace_name; # to get used space in the tablespace
TBS1 13231,625 MB
3. calculate the free space: totalspace - used space = free space
13312 - 13231.625 = 80,375 MB of space in the tablespace TBS1
B: second method
1. Select tablespace_name, sum (bytes) /(1024*1024) MB dba_free_space group by tablespace_name; # to get the free space in the tablespace
TBS1 3888,25 MB
where is my mistake?
which is correct?
best regards george
It can help u
http://kpkarthickumardba.blogspot.in/2011/12/size-difference-dbasegments-vs.html
Tags: Database
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