Purge undo tablespace usage

-- UNDO tablespace current usage / available space
SELECT a.TABLESPACE_NAME, SIZEMB, USAGEMB, (SIZEMB - USAGEMB) AS FREEMB
FROM (SELECT round(sum(BYTES) / 1e6) AS SIZEMB, b.TABLESPACE_NAME
      FROM DBA_DATA_FILES a, DBA_TABLESPACES b
      WHERE a.TABLESPACE_NAME = b.TABLESPACE_NAME AND b.CONTENTS LIKE 'UNDO'
      GROUP BY b.TABLESPACE_NAME) a,
     (SELECT c.TABLESPACE_NAME, sum(BYTES) / 1e6 AS USAGEMB
      FROM DBA_UNDO_EXTENTS c
      WHERE STATUS <> 'EXPIRED'
      GROUP BY c.TABLESPACE_NAME) b
WHERE a.TABLESPACE_NAME = b.TABLESPACE_NAME;

Source: smarttechways.com

Similar codes

1 vote273 views1 answer
Column with prefix in sql
SQL
7 votes175 views1 answer
Oracle set sequence value to max(id)
SQL
0 vote212 views2 answers
Postgres isnull
SQL
0 vote163 views1 answer
Metada in sql
SQL
0 vote186 views1 answer
Create column that already exists mysql
SQL
6 votes279 views3 answers
Psql show columns of table
SQL
5 votes185 views2 answers
Mysql drop table cascade
SQL
2 votes189 views1 answer
Sqlserver: how to search a table used in particular stored procedure
SQL
0 vote191 views1 answer
Postgres list all triggers
SQL
1 vote195 views1 answer
Sql server get users
SQL