pak ujang, apakah dengan menaikkan parameter session_cached_cursors akan memberikan impact yg significant ? bila harus menaikkan session_cached_cursors, berapakah nilai yg pas ? current parameter session_cached_cursors = 20 (masih default) dan current parameter open_cursors = 1024 (sudah pernah di rubah)
adakan saran berapa besar nilai untuk menaikkan kedua parameter ini ? mohon pencerahannya. untuk apply patch, saya akan cari2 dulu di metalink yg mengenai cursor:pin S wait on X" many thanks. On Wed, Mar 11, 2009 at 9:55 AM, Ujang Jaenudin <[email protected]>wrote: > mencermati "execute to parse", dimana kalkulasinya diambil dari > perbandingan parses/executions, parses disini adalah soft parse maupun > hard parse: > > 100*(1-(1,076.18/2,074.36)) = 48.12 > > dari situ diperkiraan terjadi "tidak efisien" pada shared pool, apatah > karena: > > - tidak menggunakan bind variable, namun ini hanya sedikit impact, > buktinya angka hard parse tidak begitu tinggi. > - parameter session_cached_cursor kurang memadai. > sehingga terlalu banyak soft parses. > - namun demikian jika melihat top 5 wait event, silahkan cek di > metalink, dulu di 10.2.0.3 pernah menemukan bugs yg berelasi dgn > "cursor: pin S wait on X". > > so, apply patch dulu baru cek lagi apakah shared pool masih bermasalah > ataukah ndak.... > > > -- > thanks and regards > ujang | oracle dba | mysql dba > http://ora62.wordpress.com > > On Tue, Mar 10, 2009 at 2:49 PM, Andes Febrian > <[email protected]<pejantan4u%40gmail.com>> > wrote: > > Halo pak ujang, maaf baru bisa bales, berikut saya paste awr report nya, > > mohon di liat2, Thanks. btw, mau tanya jg, klo istilah2 yg ada di top 5 > > event, apa siy artinya ? Many thanks. > > > > DB NameDB IdInstanceInst numReleaseRACHost > ITTDB1135347846ITTDB110.2.0.3.0NO > > ITTDB > > > > > > Snap IdSnap TimeSessionsCursors/Session Begin Snap:1874310-Mar-09 > 09:00:05 > > 258 19.8 End Snap:1874410-Mar-09 10:00:11516 14.7 Elapsed: 60.10 (mins) > DB > > Time: 647.52 (mins) > > > > Report Summary > > > > Cache Sizes > > > > > > BeginEnd > > > > Buffer Cache: 2,860M 2,860MStd Block Size: 8K Shared Pool Size: > 5,252M5,252MLog > > Buffer: 6,104K > > > > Load Profile > > > > > > Per SecondPer Transaction Redo size: 143,421.18 3,968.22 Logical > > reads:160,750.904,447.70 Block > > changes: 405.14 11.21 Physical reads: 208.17 5.76 Physical writes: > > 154.924.29 User > > calls: 1,688.73 46.72 Parses: 1,076.18 29.78 Hard parses: 3.17 0.09 > > Sorts:34.440.95 > > Logons: 13.23 0.37 Executes: 2,074.36 57.39 Transactions: 36.14 > > > > % Blocks changed per Read: 0.25Recursive Call %: 55.94 Rollback per > > transaction %: 41.85Rows per Sort: 914.74 > > > > Instance Efficiency Percentages (Target 100%) > > > > Buffer Nowait %: 100.00Redo NoWait %: 100.00 Buffer Hit %: > 99.91In-memory > > Sort %: 99.99 Library Hit %: 99.92Soft Parse %: 99.71 Execute to Parse > > %:48.12Latch > > Hit %: 98.86 Parse CPU to Parse Elapsd %: 10.59% Non-Parse CPU: 96.62 > > > > Shared Pool Statistics > > > > > > BeginEnd Memory Usage %: 74.11 78.28 % SQL with executions>1: 85.29 81.36 > % > > Memory for SQL w/exec>1: 98.95 98.60 > > > > Top 5 Timed Events > > > > EventWaitsTime(s)Avg Wait(ms)% Total Call TimeWait Class CPU time > 16,394 42.2 > > cursor: pin S wait on X 634,165 6,950 11 17.9Concurrency PX Deq Credit: > > send blkd 230,874 6,862 30 17.7Other enq: TX - row lock contention 621 > > 1,6882,7184.3 > > Application PX qref latch 430,860 1,664 4 4.3Other > > > > > > On Thu, Mar 5, 2009 at 4:37 PM, Ujang Jaenudin > > <[email protected]<ujang.jaenudin%40gmail.com> > >wrote: > > > >> bisa dipaste disini awr report sampe bagian top 5 wait event...? > >> > >> atau bisa cari statistik session cursor cache count, session cursor > >> cache hits, cursor cache hits, parse count (total). > >> > >> kalau ini cara extrim, musti hati2 di environment > >> production...analisanya pun butuh waktu :) > >> > >> alter session set events '10270 trace name context forever, level 10'; > >> > > -- Cheers, ^_^ Andes ^_^ [Non-text portions of this message have been removed]
