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Home -> Community -> Mailing Lists -> Oracle-L -> Seconds in Wait
I've been sampling active SQL at a rate of 5 Hz and saving the wait information to a table. Here is one example.
SELECT RUNDATE, EVENT, SECONDS_IN_WAIT, STATE, SEQ# FROM STATEMENT_WAIT_INFO WHERE USERNAME = 'ARF' AND ADDRESS = '8992E2C8' AND HASH_VALUE = 3642756738
RUNDATE EVENT SECONDS_IN_WAIT STATE SEQ# -------------------- ------------------------------ --------------- ------------------- ---------- 29-AUG-2002:22:41:53 SQL*Net message from dblink 3 WAITING 209 29-AUG-2002:22:41:58 SQL*Net message from dblink 8 WAITING 209 29-AUG-2002:22:42:04 SQL*Net message from dblink 25 WAITING 209 29-AUG-2002:22:42:10 SQL*Net message from dblink 30 WAITING 209 29-AUG-2002:22:42:15 SQL*Net message from dblink 35 WAITING 209 29-AUG-2002:22:42:21 SQL*Net message from dblink 39 WAITING 209 29-AUG-2002:22:42:27 SQL*Net message from dblink 42 WAITING 209 29-AUG-2002:22:42:32 SQL*Net message from dblink 47 WAITING 209 29-AUG-2002:22:42:38 SQL*Net message from dblink 52 WAITING 209 29-AUG-2002:22:42:43 SQL*Net message from dblink 57 WAITING 209 29-AUG-2002:22:42:49 SQL*Net message from dblink 62 WAITING 209 29-AUG-2002:22:42:55 SQL*Net message from dblink 64 WAITING 209 29-AUG-2002:22:43:00 SQL*Net message from dblink 69 WAITING 209 29-AUG-2002:22:43:06 SQL*Net message from dblink 86 WAITING 209 29-AUG-2002:22:43:12 SQL*Net message from dblink 91 WAITING 209 29-AUG-2002:22:43:17 SQL*Net message from dblink 96 WAITING 209 -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Note that the state is "WAITING" so seconds_in_wait should be the Actual Wait time in Seconds. See "Oracle Performance Tuning 101" pg 32. Note, also the seq# number. I am intrigued by the jump from 8 seconds to 25 seconds for the seconds_in_wait column where the clock time only advanced six seconds. Also the jump from 69 to 86 seconds of wait_time between 10:43:00 PM and 10:43:06 PM. Interestingly both of these great leaps are 17 seconds, and both occurred just after the system time had changed to the next minute. These could both be coincidences.
Any thoughts about what's going on here.
Ian MacGregor
Stanford Linear Accelerator Center
ian_at_slac.stanford.edu
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Please see the official ORACLE-L FAQ: http://www.orafaq.com
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Author: MacGregor, Ian A.
INET: ian_at_SLAC.Stanford.EDU
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