How to determine the approximate amount of SQL work left in Oracle?

Problem:

You want to know how much longer a long running SQL might ake to finish.

Solution

We can use “V$SESSION_LONGOPS" view to know the approximate time of a query left to execute. "V$SESSION_LONGOPS” view displays the status of various database operations that have been running for longer than six seconds. Please note that this view give you only a rough estimate of when a SQL might complete.

Example

select a.username ,a.opname ,b.sql_text ,to_char(a.start_time,'DD-MON-YY HH24:MI') start_time ,a.elapsed_seconds how_long ,a.time_remaining secs_left ,a.sofar ,a.totalwork ,round(a.sofar/a.totalwork*100,2) percent from v$session_longops a ,v$sql b where a.sql_address = b.address and a.sql_hash_value = b.hash_value and a.sofar <> a.totalwork and a.totalwork != 0;

In order, to view the results properly via SQLPLUS, set he below parameters first.

Example

SET LINESIZE 141 TRIMSPOOL ON PAGES 66 COL username FORMAT A8 HEAD "User|Name" COL opname FORMAT A16 HEAD "Operation|Type" COL sql_text FORMAT A33 HEAD "SQL|Text" TRUNC COL start_time FORMAT A15 HEAD "Start|Time" COL how_long FORMAT 99,990 HEAD "Time|Run" COL secs_left FORMAT 99,990 HEAD "Appr.|Secs Left" COL sofar FORMAT 9,999,990 HEAD "Work|Done" COL totalwork FORMAT 9,999,990 HEAD "Total|Work" COL percent FORMAT 999.90 HEAD "%|Done" select a.username ,a.opname ,b.sql_text ,to_char(a.start_time,'DD-MON-YY HH24:MI') start_time ,a.elapsed_seconds how_long ,a.time_remaining secs_left ,a.sofar ,a.totalwork ,round(a.sofar/a.totalwork*100,2) percent from v$session_longops a ,v$sql b where a.sql_address = b.address and a.sql_hash_value = b.hash_value? and a.sofar <> a.totalwork and a.totalwork != 0;

Kiran P

Published on 05-Dec-2020 06:22:48

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