Tuning Undo - Part 1

Execute the following query,

SELECT inst_id, to_char(begin_time,'MM/DD/YYYY HH24:MI') begin_time, UNXPSTEALCNT "Unexpired Stolen", EXPSTEALCNT "Expired Reused",
SSOLDERRCNT "Snapshot err", NOSPACEERRCNT "Out of space err",
MAXQUERYLEN, tuned_undoretention
FROM gv$undostat
WHERE begin_time between to_date('','MM/DD/YYYY HH24:MI:SS')and to_date('','MM/DD/YYYY HH24:MI:SS')
ORDER BY inst_id, begin_time;

Problem 1: Out of space error and unexpired extents are stolen
Solution : Increase the undo Tablespace size.

Problem 2: Snapshot error and Expired extents are reused
Solution: Increase the undo Retention

Thanks