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Usage of the temp tablespace in Oracle

First find the block size:

SELECT VALUE "BLOCK_SIZE"
FROM v$parameter
WHERE name='db_block_size' ;

Now check the usage of the tablespace:

SELECT
 s.username "USER",s.sid,s.osuser,
 u.TABLESPACE "TS" ,
 SUM(u.blocks) * &BLOCK_SIZE./1024/1024 MB,
 x.sql_text
FROM v$session s,v$sort_usage u,v$sqltext x
WHERE s.saddr=u.session_addr
 AND s.sql_address=x.address
GROUP BY
 s.sid, s.username, osuser,
 TABLESPACE, sql_text, address, piece
ORDER BY sid, piece ASC;

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