whisch are OK for undo_retention and what is the difference

Hi all

whisch are OK for undo_retention and what is the difference


SQL > select max (maxquerylen) of v$ undostat;

MAX (MAXQUERYLEN)
----------------
6060

SQL > select max (maxquerylen) in the dba_hist_undostat;

MAX (MAXQUERYLEN)
----------------
17221

Hi amal.

You can use begin_time & end_time v$ undostat-> to specify the time interval that you want.

A brief note, of what you discussed here:

maxquerylen

Identifies the length of the longest request (in seconds) in the Forum during the period. You can use this statistic to estimate the right setting of UNDO_RETENTION initialization parameter. The length of a query is measured between the open time of cursor for the last time to fetch/execution of the cursor. As the length of these cursors that have been read/performed during the period are reflected in the view.

V$ UNDOSTAT is dynamic, display of the current statistics.

DBA_HIST_UNDOSTAT displays the history of the histograms of statistical data to show how the system works. Available statistics include undo space consumption, simultaneity of the transaction and the length of queries in the instance. This view contains snapshots of V$ UNDOSTAT

hope that helps.

Kind regards
X

Tags: Database

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