Whisch one is correct for undo_retention and what is the difference

Hi ALL,
whisch one is correct for undo_retention and what is the difference
SQL> select max(maxquerylen) from v$undostat;
MAX(MAXQUERYLEN)
6060
SQL> select max(maxquerylen) from dba_hist_undostat;
MAX(MAXQUERYLEN)
17221

hi Afzal,
you can use begin_time & end_time of v$undostat -> to specify the time interval of your interest.
A brief note, of what you have discussed here:
maxquerylen
Identifies the length of the longest query (in seconds) executed in the instance during the period. You can use this statistic to estimate the proper setting of the UNDO_RETENTION initialization parameter. The length of a query is measured from the cursor open time to the last fetch/execute time of the cursor. Only the length of those cursors that have been fetched/executed during the period are reflected in the view.
V$UNDOSTAT is dynamic, showing current stats.
DBA_HIST_UNDOSTAT displays the history of histograms of statistical data to show how well the system is working. The available statistics include undo space consumption, transaction concurrency, and length of queries executed in the instance.This view contains snapshots of V$UNDOSTAT
hope it help.
regards,
X

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