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Monitor Tablespace Script Oracle 12c 11g 10g

The Below Script will generate output if percentage of tablespace space left free is less tan 20%. You can easily put in a shell script and schedule it on crontab to send alerts on a daily basis.

select df.tablespace_name tspace,
round(sum(fs.bytes)/(df.bytes) * 100) "%_free",
round(sum(fs.bytes)/(1024*1024)) free_ts_size,
df.bytes/(1024*1024) tot_ts_size
from dba_free_space fs, (select tablespace_name, sum(bytes) bytes from dba_data_files
group by tablespace_name ) df
where fs.tablespace_name = df.tablespace_name
group by df.tablespace_name, df.bytes
having round(sum(fs.bytes)/(df.bytes) * 100) < 20;


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