Oracle undotbs 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

Oracle undotbs usage

-- UNDOTBS usage per User:
SELECT u.TABLESPACE_NAME          AS TABLESPACE,
       s.USERNAME,
       u.STATUS,
       sum(u.BYTES) / 1024 / 1024 AS SUM_IN_MB,
       count(u.SEGMENT_NAME)      AS SEG_CNTS
FROM DBA_UNDO_EXTENTS u, V$TRANSACTION T, V$SESSION s
WHERE T.ADDR = s.TADDR
GROUP BY u.TABLESPACE_NAME, s.USERNAME, u.STATUS
ORDER BY 1, 2, 3;

Similar codes

-2 votes182 views2 answers
Add auto_increment column to existing table mysql
SQL
0 vote175 views2 answers
Mysql to python pandas
SQL
0 vote171 views1 answer
Can we rollback deleted data in sql
SQL
19 votes173 views2 answers
Mysql tinyint max value
SQL
0 vote171 views1 answer
Access denied for user 'root'@'localhost' workbench ubuntu
SQL
0 vote188 views1 answer
Postgresql regular expression special characters
SQL
0 vote203 views1 answer
TSQL function split string
SQL
1 vote223 views2 answers
Laravel jwt generate token
SQL
2 votes160 views2 answers
Oracle create table if not exists
SQL
13 votes172 views5 answers
Alter table query sql server change column
SQL