I need some clarification on my understanding of the Row Source Operation
section in the TKP output file. The following statistics show that the
statement was executed 27 times and it ended up doing over 300k IOs. However,
the Row Source Operation section of the statement shows that only one row was
scanned from the OE_ORDER_HEADERS_N5 index. When I looked at the raw trace
file, I could see that the first 10-12 runs of the statement were very quick
and only one of the last few runs ran longer and did most of the IOs. So, it
seems that the Row Source Operation section in TKP only reports statistics from
the first run? I was under the impression that this section shows cumulative
value from all executions?
call count cpu elapsed disk query current rows
------- ------ -------- ---------- ---------- ---------- ---------- ----------
Parse 1 0.00 0.00 0 0 0 0
Execute 27 63.79 796.81 328824 344593 0 0
Fetch 27 0.00 0.00 0 0 0 25
------- ------ -------- ---------- ---------- ---------- ---------- ----------
total 55 63.79 796.81 328824 344593 0 25
Rows (1st) Rows (avg) Rows (max) Row Source Operation
---------- ---------- ----------
---------------------------------------------------
1 1 1 FILTER (cr=4 pr=0 pw=0 time=58 us)
1 1 1 FAST DUAL (cr=0 pr=0 pw=0 time=2 us cost=2
size=0 card=1)
1 1 1 TABLE ACCESS BY INDEX ROWID
OE_ORDER_HEADERS_ALL (cr=4 pr=0 pw=0 time=49 us cost=47 size=19 card=1)
1 1 1 INDEX RANGE SCAN OE_ORDER_HEADERS_N5 (cr=3
pr=0 pw=0 time=26 us cost=3 size=0 card=73)(object id 164369)
Thanks
