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Home -> Community -> Mailing Lists -> Oracle-L -> RE: "free buffer waits" under eXtreme Transaction Loads
Shall get requested info & post. Below data from the SAME Statspack Report
Buffer Pool Statistics for DB: BMON Instance: bmon Snaps: 666 -667
-> Standard block size Pools D: default, K: keep, R: recycle
-> Default Pools for other block sizes: 2k, 4k, 8k, 16k, 32k
Free Write
Buffer
Number of Cache Buffer Physical Physical Buffer Complete
Busy
P Buffers Hit % Gets Reads Writes Waits Waits
Waits
init.ora Parameters for DB: BMON Instance: bmon Snaps: 666 -667
End
value
Parameter Name Begin value (if
different)
----------------------------- ---------------------------------
------------
_library_cache_advice FALSE
_log_simultaneous_copies 256
_system_trig_enabled FALSE
aq_tm_processes 0
compatible 9.2.0.5
control_files /BMON/findata1/TBAHP/CF/bmon_cont
db_2k_cache_size 268435456
db_block_size 8192
db_cache_advice off
db_cache_size 536870912
db_file_multiblock_read_count 8
db_files 1024
db_name bmon
db_writer_processes 4
dml_locks 2500
enqueue_resources 800000
global_names TRUE
hash_join_enabled FALSE
hpux_sched_noage 178
job_queue_processes 4
log_buffer 1048576
log_checkpoint_interval 31457290
log_checkpoint_timeout 0
log_parallelism 4
max_dump_file_size 10485760
open_cursors 5000
optimizer_index_cost_adj 15
parallel_max_servers 0
pga_aggregate_target 314572800
processes 2500
session_cached_cursors 50
sessions 4000
shared_pool_size 167772160
sort_area_size 1048576
transaction_auditing FALSE
undo_management AUTO
undo_tablespace undotbs
-------------------------------------------------------------
-----Original Message-----
From: VIVEK_SHARMA=20
Sent: Monday, July 26, 2004 10:59 PM
To: 'oracle-l_at_freelists.org'; 'oracledba_at_lazydba.com'
Subject: "free buffer waits" under eXtreme Transaction Loads
Folks
How are "free buffer waits" (below) to be addressed?
Case - Benchmark of OLTP Transactions(ATM Trans) of a Banking Application
Machine - HP Superdome
Storage XP1024
DB Server =3D 32 CPUs (Itanium)
CPU Utilization =3D 30 % approx
For log file sync wait (below) we are considering assigning 4 controllers exclusively to the 4 logfiles(raw)
Will provide any data needed
Thanks
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@STATSPACK report for
DB Name DB Id Instance Inst Num Release Cluster Host ------------ ----------- ------------ -------- ----------- -------
BMON 19538057 bmon 1 9.2.0.5.0 NO sut92
Snap Id Snap Time Sessions Curs/Sess Comment
------- ------------------ -------- ---------
-------------------
Begin Snap: 666 26-Jul-04 00:42:11 82 16.1
End Snap: 667 26-Jul-04 00:53:04 84 35.4
Elapsed: 10.88 (mins)
Cache Sizes (end)
Buffer Cache: 768M Std Block Size: 8K
Shared Pool Size: 160M Log Buffer: 1,024K
Load Profile
~~~~~~~~~~~~ Per Second Per Transaction
--------------- ---------------
Redo size: 6,159,634.77 5,678.93
Logical reads: 101,769.87 93.83
Block changes: 26,383.87 24.32
Physical reads: 11.62 0.01
Physical writes: 392.43 0.36
User calls: 33,233.83 30.64
Parses: 3,261.30 3.01
Hard parses: 0.00 0.00
Sorts: 0.29 0.00
Logons: 0.00 0.00
Executes: 30,980.41 28.56
Transactions: 1,084.65
% Blocks changed per Read: 25.93 Recursive Call %: 6.54
Rollback per transaction %: 0.00 Rows per Sort: 126.76
Instance Efficiency Percentages (Target 100%)
Buffer Nowait %: 99.98 Redo NoWait %: 100.00
Buffer Hit %: 99.99 In-memory Sort %: 100.00
Library Hit %: 100.02 Soft Parse %: 100.00
Execute to Parse %: 89.47 Latch Hit %: 98.18
Parse CPU to Parse Elapsd %: 83.70 % Non-Parse CPU: 98.47
Shared Pool Statistics Begin End
------ ------
Memory Usage %: 42.95 43.16
% SQL with executions>1: 80.91 84.42
% Memory for SQL w/exec>1: 81.85 86.25
Top 5 Timed Events
~~~~~~~~~~~~~~~~~~ % Total Event Waits Time (s)Ela Time
-------------------------------------------- ------------ -----------
--------
log file sync 710,816 2,601
24.30
CPU time 2,569
24.00
free buffer waits 3,743 2,525
23.58
latch free 90,584 1,056
9.86
write complete waits 981 749
7.00
-------------------------------------------------------------
CPU Elapsd
Buffer Gets Executions Gets per Exec %Total Time (s) Time (s)
Hash Value
7,753,648 708,188 10.9 11.7 199.02 1427.49
327885819
Module: lisrvr_at_sut93 (TNS V1-V3)
insert into TBA_DAILY_TRAN_DETAIL_TBL (tran_date,tran_id,part_tr
an_srl_num,del_flg,tran_type,tran_sub_type,part_tran_type,gl_sub
_head_code,acid,value_date,tran_amt,tran_particular,entry_user_i
d,pstd_user_id,vfd_user_id,entry_date,pstd_date,vfd_date,rpt_cod
e,ref_num,instrmnt_type,instrmnt_date,instrmnt_num,instrmnt_alph
-- Archives are at http://www.freelists.org/archives/oracle-l/ FAQ is at http://www.freelists.org/help/fom-serve/cache/1.html -----------------------------------------------------------------Received on Mon Jul 26 2004 - 22:24:21 CDT
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