Oracle undo usage by session

-- 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 undo usage by session

-- UNDO tablespace usage per user / session
SELECT s.SID, s.USERNAME, round(sum(ss.VALUE) / 1e6, 2) AS UNDO_SIZE_MB,
       sql.ELAPSED_TIME, sql.SQL_TEXT
FROM V$SESSTAT ss JOIN V$SESSION s ON s.SID = ss.SID
     JOIN V$STATNAME STAT ON STAT.STATISTIC# = ss.STATISTIC#
     LEFT JOIN V$SQLAREA sql 
     	ON s.SQL_ADDRESS = sql.ADDRESS AND s.SQL_HASH_VALUE = sql.HASH_VALUE
WHERE STAT.NAME = 'undo change vector size' AND s.TYPE <> 'BACKGROUND' 
  AND s.USERNAME IS NOT NULL AND ss.VALUE >= 0.01 * 1e6
GROUP BY s.SID, s.USERNAME, sql.ELAPSED_TIME, sql.SQL_TEXT
ORDER BY s.USERNAME, round(sum(ss.VALUE) / 1e6, 2);

Source: dba.stackexchange.com

Oracle undo usage per session

-- 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 votes171 views1 answer
Select from array in psql
SQL
0 vote139 views1 answer
Sql values not in another table
SQL
0 vote129 views1 answer
Access denied for user 'root'@'localhost' workbench ubuntu
SQL
0 vote123 views1 answer
Mysql function variable
SQL
1 vote127 views6 answers
In sql
SQL
0 vote132 views1 answer
Access denied for user 'root'@'localhost' (using password no) stackoverflow
SQL
11 votes152 views4 answers
Reset identity column values in sql server
SQL
1 vote139 views1 answer
Delete from inner join sql
SQL
0 vote120 views1 answer
Postgres set default schema
SQL
0 vote131 views1 answer
SqlFunction does not exist
SQL