Oracle Database Discussions

Hello,

The system we use is a kind of OLTP thing.
platform - linux
version - 10.2

here, in the statspack everything seems okay to me except the logical reads.(if not tell)

the problems is, the cpu grows gradually and reaches 100.

i need the cpu to be steady.

can somebody tell what is happening here?

STATSPACK report for

Database DB Id Instance Inst Num Startup Time Release RAC
~~~~~~~~ ----------- ------------ -------- --------------- ----------- ---
2386172435 apple22a 1 11-Aug-09 23:14 10.2.0.1.0 NO

Host Name: xxxxxxxxx Num CPUs: 4 Phys Memory (MB): 2
~~~~

Snapshot Snap Id Snap Time Sessions Curs/Sess Comment
~~~~~~~~ ---------- ------------------ -------- --------- -------------------
Begin Snap: 1747 11-Aug-09 23:23:46 96 7.6
End Snap: 1752 11-Aug-09 23:34:00 218 12.5
Elapsed: 10.23 (mins)

Cache Sizes Begin End
~~~~~~~~~~~ ---------- ----------
Buffer Cache: 2,864M Std Block Size: 8K
Shared Pool Size: 656M Log Buffer: 29,855K

Load Profile Per Second Per Transaction
~~~~~~~~~~~~ --------------- ---------------
Redo size: 8,051,891.15 5,042.02
Logical reads: 289,821.64 181.48
Block changes: 49,889.55 31.24
Physical reads: 197.76 0.12
Physical writes: 717.84 0.45
User calls: 1,908.82 1.20
Parses: 962.84 0.60
Hard parses: 0.25 0.00
Sorts: 591.85 0.37
Logons: 0.35 0.00
Executes: 25,757.48 16.13
Transactions: 1,596.96

% Blocks changed per Read: 17.21 Recursive Call %: 94.11
Rollback per transaction %: 26.58 Rows per Sort: 628.58

Instance Efficiency Percentages
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Buffer Nowait %: 99.97 Redo NoWait %: 100.00
Buffer Hit %: 99.93 In-memory Sort %: 100.00
Library Hit %: 100.01 Soft Parse %: 99.97
Execute to Parse %: 96.26 Latch Hit %: 99.78
Parse CPU to Parse Elapsd %: 91.30 % Non-Parse CPU: 99.31

Shared Pool Statistics Begin End
------ ------
Memory Usage %: 47.56 49.99
% SQL with executions>1: 60.62 73.55
% Memory for SQL w/exec>1: 77.58 84.79

Top 5 Timed Events Avg %Total
~~~~~~~~~~~~~~~~~~ wait Call
Event Waits Time (s) (ms) Time
----------------------------------------- ------------ ----------- ------ ------
CPU time 1,362 31.6
log file sync 16,960 1,264 75 29.4
PL/SQL lock timer 10 586 58606 13.6
buffer busy waits 57,444 388 7 9.0
enq: TX - row lock contention 12,036 298 25 6.9
-------------------------------------------------------------
Host CPU (CPUs: 4)
~~~~~~~~ Load Average
Begin End User System Idle WIO WCPU
------- ------- ------- ------- ------- ------- --------
0.20 10.74 53.82 9.51 36.67

Note: There is a 8% discrepancy between the OS Stat total CPU time and
the total CPU time estimated by Statspack
OS Stat CPU time: 2261(s) (BUSY_TIME + IDLE_TIME)
Statspack CPU time: 2456(s) (Elapsed time * num CPUs in end snap)

Instance CPU
~~~~~~~~~~~~
% of total CPU for Instance: 63.51
% of busy CPU for Instance: 100.30
%DB time waiting for CPU - Resource Mgr:

Memory Statistics Begin End
~~~~~~~~~~~~~~~~~ ------------ ------------
Host Mem (MB): 1.9 .0
SGA use (MB): 3,584.0 3,584.0
PGA use (MB): 164.2 258.5
% Host Mem used for SGA+PGA: 194875.2 8987233.1
-------------------------------------------------------------


Avg
%Time Total Wait wait Waits
Event Waits -outs Time (s) (ms) /txn
--------------------------------- ------------ ------ ---------- ------ --------
log file sync 16,960 4 1,264 75 0.0
PL/SQL lock timer 10 100 586 58606 0.0
buffer busy waits 57,444 0 388 7 0.1
enq: TX - row lock contention 12,036 0 298 25 0.0
log file parallel write 11,870 0 163 14 0.0
db file sequential read 21,324 0 95 4 0.0
log file sequential read 3,963 0 47 12 0.0
db file scattered read 22,614 0 29 1 0.0
log file switch completion 102 17 28 272 0.0
latch: cache buffers chains 5,829 0 11 2 0.0
Log archive I/O 4,346 0 9 2 0.0
enq: TX - index contention 1,153 0 7 6 0.0
latch free 1,483 0 4 3 0.0
control file parallel write 328 0 4 11 0.0
control file sequential read 1,593 0 2 1 0.0
latch: enqueue hash chains 337 0 2 6 0.0
buffer deadlock 1,091 99 2 2 0.0



Segments by Logical Reads DB/Inst: apple22A/apple22a Snaps: 1747-1752
-> End Segment Logical Reads Threshold: 10000
-> Pct Total shows % of logical reads for each top segment compared with total
logical reads for all segments captured by the Snapshot

Subobject Obj. Logical Pct
Owner Tablespace Object Name Name Type Reads Total
---------- ---------- -------------------- ------------ ----- ------------ -----
TPCCDB TPCCDB NEW_ORDER TABLE 89,638,240 51.4
TPCCDB TPCCDB PK_STOCK INDEX 22,913,776 13.1
TPCCDB TPCCDB PK_ORDER_LINE INDEX 14,941,264 8.6
TPCCDB TPCCDB PK_O_ORDER INDEX 10,503,040 6.0
TPCCDB TPCCDB ORDER_LINE TABLE 6,368,896 3.7
-------------------------------------------------------------


Segments by Physical Reads DB/Inst: apple22A/apple22a Snaps: 1747-1752
-> End Segment Physical Reads Threshold: 1000

Subobject Obj. Physical Pct
Owner Tablespace Object Name Name Type Reads Total
---------- ---------- -------------------- ------------ ----- ------------ -----
TPCCDB TPCCDB NEW_ORDER TABLE 49 12.2
TPCCDB TPCCDB WAREHOUSE TABLE 49 12.2
TPCCDB TPCCDB DISTRICT TABLE 49 12.2
TPCCDB TPCCDB INDEX_NO_D_ID INDEX 49 12.2
TPCCDB TPCCDB PK_NEW_ORDER INDEX 49 12.2
-------------------------------------------------------------

SQL Memory Statistics DB/Inst: apple22A/apple22a Snaps: 1747-1752

Begin End % Diff
-------------- -------------- --------------
Avg Cursor Size (KB): 65.12 67.79 3.95
Cursor to Parent ratio: 1.03 1.02 -.08
Total Cursors: 560 620 9.68
Total Parents: 546 605 9.75
-------------------------------------------------------------
init.ora Parameters DB/Inst: apple22A/apple22a Snaps: 1747-1752

End value
Parameter Name Begin value (if different)
----------------------------- --------------------------------- --------------
aq_tm_processes 1
audit_file_dest /rdbms/oracle/apple22i/64/admin/o
background_dump_dest /rdbms/oracle/apple22i/64/admin/o
commit_write BATCH,NOWAIT
compatible 10.2.0.1.0
control_files /rdbms/oracle/apple22i/64/oradata
core_dump_dest /rdbms/oracle/apple22i/64/admin/o
cursor_sharing EXACT
db_block_size 8192
db_domain yyyyyyy
db_file_multiblock_read_count 16
db_name apple22a
db_recovery_file_dest /rdbms/oracle/apple22i/64/flash_r
db_recovery_file_dest_size 2147483648
dispatchers (PROTOCOL=TCP) (SERVICE=apple22aX
dml_locks 30028
global_names TRUE
job_queue_processes 10
log_archive_dest_1 LOCATION=/perf0/Archivelog_10g_ch
log_archive_format arch_%t_%s_%r.dbf
log_buffer 30571520
open_cursors 300
pga_aggregate_target 524288000
processes 2000
remote_login_passwordfile EXCLUSIVE
sessions 2205
sga_max_size 3758096384
sga_target 3758096384
transactions 7507
undo_management AUTO
undo_tablespace UNDOTBS1
user_dump_dest /rdbms/oracle/apple22i/64/admin/o
-------------------------------------------------------------