bytes received via SQL*Net from
d 123,793 146.9 1.6 bytes sent via SQL*Net to
client 25,187,619 29,878.6 333.1 bytes sent via SQL*Net to
dblink 76,754 91.1 1.0 calls to get snapshot scn:
kcmgss 1,533,555 1,819.2 20.3
calls to
kcmgas 149,646 177.5 2.0
calls to
kcmgcs 10,190 12.1 0.1
change write
time 762 0.9 0.0 cleanout - number of ktugct
calls 13,095 15.5 0.2 cluster key scan block
gets 424 0.5 0.0
cluster key
scans 202 0.2 0.0 commit cleanout failures: block
l 1 0.0 0.0 commit cleanout failures:
buffer 18 0.0 0.0 commit cleanout failures:
callbac 63 0.1 0.0 commit cleanout failures:
cannot 2,087 2.5 0.0
commit
cleanouts 643,505 763.4 8.5
commit cleanouts successfully
com 641,336 760.8 8.5 commit txn count during
cleanout 35,188 41.7 0.5
consistent
changes 63,943 75.9 0.9 consistent
gets 16,616,758 19,711.5 219.8
由consistent gets，db block gets和physical reads这三个值，我们也可以计算得到buffer hit ratio，计算的公式如下： buffer hit ratio = 100*(1-physical reads /(consistent gets+ db block gets))，例如在这里，我们可以计算得到：buffer hit ratio =100*(1-26524/(16616758+2941398))= 99.86
consistent gets -
examination 1,168,584 1,386.2 15.5 current blocks converted for
CR 0 0.0 0.0
cursor
authentications 2 0.0 0.0
data blocks consistent reads -
un 63,873 75.8 0.8
db block
changes 2,596,938 3,080.6 34.4
db block
gets 2,941,398 3,489.2 38.9
deferred (CURRENT) block
cleanout 130,783 155.1 1.7
dirty buffers
inspected 166 0.2 0.0
脏数据从LRU列表中老化，A value here indicates that the DBWR is not keeping up。如果这个值大于0，就需要考虑增加DBWRs。
dirty buffers inspected: This is the number of dirty (modified) data buffers that were aged out on the LRU list. You may benefit by adding more DBWRs.If it is greater than 0, consider increasing the database writes.
enqueue
conversions 485 0.6 0.0
enqueue
deadlocks 0 0.0 0.0
enqueue
releases 318,825 378.2 4.2
enqueue
requests 318,825 378.2 4.2
enqueue
timeouts 0 0.0 0.0
Instance Activity Stats for DB: ORA92 Instance: ora92 Snaps: 13 -14 Statistic Total per Second per Trans
--------------------------------- ------------------ -------------- ------------
enqueue
waits 728 0.9 0.0
exchange
deadlocks 30 0.0 0.0
execute
count 1,004,280 1,191.3 13.3
free buffer
inspected 188 0.2 0.0
这个值包含dirty，pinned，busy的buffer区域，如果free buffer inspected - dirty buffers inspected - buffer is pinned count的值还是比较大，表明不能被重用的内存块比较多，这将导致latch争用，需要增大buffer cache。
free buffer
requested 116,422 138.1 1.5 hot buffers moved to head of
LRU 17,750 21.1 0.2 immediate (CR) block cleanout
app 1,916 2.3 0.0 immediate (CURRENT) block
cleanou 81,385 96.5 1.1 index fast full scans
(full) 0 0.0 0.0 index fetch by
key 335,907 398.5 4.4 index scans
kdiixs1 692,053 820.9 9.2 leaf node 90-10
splits 418 0.5 0.0 leaf node
splits 1,941 2.3 0.0
logons
cumulative 716 0.9 0.0
messages
received 67,830 80.5 0.9