Need help for analysis "plan and background events waiting" on the report statspack for oracle database 11.2.0.4 on AIX

HI: I analyze the STATSPACK report: this is the "volume test" on our UAT server for most of entry or "bind variables".  Our shared pool is well used in oracle.  Recovery of Oracle logs is not configured properly on this server, as in "Top 5 events of waiting", there are 2 for Oder.

I need to know what other information may be digging from of 'waiting in the foreground events' & ' background waiting events ", and which can help us better understand, in combination of ' Top 5 wait event, that how did the server test /?  It could be overwhelming. wait events, so appreciate useful diagnostic or analyses.  Database is oracle 11.2.0.4 updated from 11.2.0.3 on IBM AIX 64-bit, level 6.x system power


STATSPACK report


DB Id Instance Inst Num Startup Time Release RAC database


~~~~~~~~ ----------- ------------ -------- --------------- ----------- ---

700000XXX XXX 1 22 April 15 12:12 11.2.0.4.0 no.


Host name Platform CPU Cores Sockets (G) memory

~~~~ ---------------- ---------------------- ----- ----- ------- ------------

dXXXX_XXX AIX-Based Systems (64-2 1 0 16.0)


Snapshot Id Snap Snap time Sessions Curs/Sess comment

~~~~~~~~    ---------- ------------------ -------- --------- ------------------

BEGIN Snap: 5635 22 April 15 13:00:02 114 4.6

End Snap: 5636 22 April 15 14:00:01 128 8.8

Elapsed time: 59.98 (mins) Av law Sess: 0.6

DB time: 35,98 (mins) DB CPU: 19,43 (mins)


Cache sizes Begin End

~~~~~~~~~~~       ---------- ----------

Cache buffer: block 2 064 M Std size: 8 K

Shared pool: 3 072 M Log Buffer: 13 632 K

Load profile per second per Transaction per Exec by call

~~~~~~~~~~~~      ------------------  ----------------- ----------- -----------

DB Time (s): 0.0 0.6 0.00 0.00

DB CPU: 0.0 0.3 0.00 0.00

Size: 458 720,6 8,755.7

Logical reads: 245,7 12 874,2

Block changes: 1 356.4 25.9

Physical reads: 6.6 0.1

Physical writings: 61.8 1.2

The user calls: 38.8 2 033,7

Analysis: 286,5 5.5

Hard analysis: 0.5 0.0

Treated W/A Mo: 1.7 0.0

Logons: 1.2 0.0

Runs: 801,1 15.3

Cancellations: 6.1 0.1

Operations: 52.4


Indicators of the instance

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Buffer % Nowait: 100.00 do NoWait %: 100.00

Buffer % success: 99.98% W/A optimal, Exec: 100.00

Library success %: 99,77% soft Parse: 99.82

Run parse %: 64.24 latch hit %: 99.98

Analyze the CPU to analyze Elapsd %: 53.15% Non-Parse CPU: 98.03


Shared pool statistics Begin End

------  ------

% Memory use: 10.50 12.79

% SQL with executions > 1: 69,98 78,37

% Memory for SQL w/exec > 1: 70.22 81,96

Top 5 timed events Avg % Total

~~~~~~~~~~~~~~~~~~                                                   wait   Call

Event waits time (s) (ms) time

----------------------------------------- ------------ ----------- ------ ------

CPU time                                                       847          50.2

ENQ: TX - 4 480 97 434 25.8 line lock conflict

Log file sync 284 169 185 1 11.0

log file parallel write 299 537 164 1 9.7

log file sequential read 698 16 24 1.0

Host CPU (processors: 2 hearts: Sockets 1: 0)

~ ~ ~ Medium load

Begin End User System Idle WIO WCPU

------- -------   ------- ------- ------- ------- --------

1.16 1.84 19.28 14.51 66.21 1.20 82.01


Instance of CPU

~~~~~~~~~~~~                                       % Time (seconds)

-------- --------------

Host: Time (s) Total: 7,193.8

Host: Availability of time processor (s): 2,430.7

% of time host is busy: 33.8

Instance: Time processor Total (s): 1,203.1

% Busy CPU used, for example: 49.5

Instance: Time of database total (s): 2,426.4

% DB time waiting for CPU (resp. resources): 0.0


Statistical memory Begin End

~~~~~~~~~~~~~~~~~                ------------ ------------

Host Mem (MB): 16,384.0 16 384,0

Use of LMS (MB): 7,136.0 7 136,0

Use of PGA (Mo): 282.5 361.4

Host % Mem used for SGA + PGA: 45.3 45.8

Foreground wait events DB/Inst: XXXXXs Snaps: 5635-5636

-> Only events with wait times Total (s) > =.001 are indicated

--> sorted by Total desc waiting time, waits desc (idle last events)


AVG % Total

% Tim Total wait Wait Wait call

Event is waiting for the time (s) (ms) /txn times

---------------------------- ------------ ---- ---------- ------ -------- ------

ENQ: TX - line lock 4 480 0 434 97 contentio 0,0 25.8

284 167 0 185 1 file synchronization log 1.5 11.0

File I/O 8 741 of disk 0 4 operations 0.0 0.2

direct path write 0 13 247 3 0.1 0.2

DB file sequential read 6 058 0 1 0.0 0.1

buffer busy waits 1 800 0 1 1 0,0.1

SQL * Net more data to the client 29 161 0 1 0.2 0.1

direct path read 7 696 0 1 0.0 0.0

db file scattered read 316 0 1 2 0,0.0

latch: shared pool 144 0 0 2 0,0.0

Initialization of 30 0 0 3 0,0.0 CSS

cursor: hand 10 0 0 9 0,0.0 S

lock row cache 41 0 0 2 0,0.0

latch: rank objects cache 19 0 0 3 0,0.0

log file switch (private 8 0 0 7 0,0.0 str

library cache: mutex X 28 0 0 2 0,0.0

latch: cache buffers chains 54 0 0 1 0,0.0

free lock 290 0 0 0.0 0.0

sequential control file read 1 568 0 0 0.0 0.0

switch logfile (4 0 0 6 0,0.0 control point

Live sync 8 0 0 3 0,0.0 road

latch: redo allocation 60 0 0 0 0.0.0

SQL * Net break/reset for 34 0 0 1 0,0.0 customer

latch: enqueue hash chains 45 0 0 0 0.0.0

latch: cache buffers lru chain 7 0 0 2 0,0.0

latch: allowance 5 0 0 1 0,0.0 session

latch: object queue header 6 0 0 1 0,0.0 o

Operation of metadata files ASM 30 0 0 0 0.0.0

latch: in memory of undo latch 15 0 0 0.0 0.0

latch: cancel the overall data 8 0 0 0 0.0.0

SQL * Net client message 6 362 536 0 278 225 44 33.7

jobq slave wait 7 270 100 3 635 500 0.0

SQL * Net more data to 7 976 0 15 2 0,0 clien

SQL * Net message to client 6 362 544 0 8 0 33.7

-------------------------------------------------------------

Context of the DB/Inst events waiting: XXXXXs clings: 5635-5636

-> Only events with wait times Total (s) > =.001 are indicated

--> sorted by Total desc waiting time, waits desc (idle last events)

AVG % Total

% Tim Total wait Wait Wait call

Event is waiting for the time (s) (ms) /txn times

---------------------------- ------------ ---- ---------- ------ -------- ------

log file parallel write 299 537 0 164 1 1.6 9.7

log file sequential read 698 0 16 24 0.0 1.0

db file parallel write 9 556 0 13 1 0,1.8

146 0 10 70 0,0.6 startup operating system thread

control file parallel write 2 037 0 2 1 0,0.1

Newspaper archive e/s 35 0 1 30 0,0.1

LGWR wait for redo copy 2 447 0 0 0.0 0.0

async file IO DB present 9 556 0 0 0.1 0.0

DB file sequential read 145 0 0 2 0,0.0

File I/O disk 349 0 operations 0 0.0 0.0

db file scattered read 30 0 0 4 0,0.0

sequential control file read 5 837 0 0 0.0 0.0

ADR block lu file 19 0 0 4 0,0.0

Block ADR file write 5 0 0 15 0,0.0

direct path write 14 0 0 2 0,0.0

direct path read 3 0 0 7 0,0.0

latch: shared pool 3 0 0 6 0,0.0

single log file write 56 0 0 0.0 0.0

latch: redo allocation 53 0 0 0 0.0.0

latch: 1 0 0 3 0,0.0 active service list

free latch 11 0 0 0 0.0.0

CPI of RDBMS 5 314 523 57 189 182 1.7 message

Space Manager: slave wa slowed 4 086 88 18 996 4649 0.0

DIAG idle wait 7 185 100 1000 7 186 0.0

Streams AQ: waiting time 2 50 4 909 # 0,0

Streams AQ: qmn slowed slave 129 0 3 612 28002 0.0 w

Streams AQ: Coordinator of the 258 50 3 612 14001 0,0 qmn

SMON timer 2 43 3 605 83839 0.0

PMON timer 99 1 199 2999 3 596 0.0

SQL * Net client message 17 019 0 31 2 0.1

SQL * Net message to client 12 762 0 0 0.1 0

class slaves wait 28 0 0 0 0.0

Thank you very much!

Hello

I think that your CPU is overloaded by your stress tests. You have one VCPU with 2 wires (2 LCPU), right? And the load average is greater than one. You have time DB which is not counted in (CPU time + wait events) and which comes no doubt from time spent in the runqueue.

> Oracle recovery logs is not properly configured on this server, as in "Top 5 events of waiting", there are 2 for oder

It is an error in statspack for show "log file parallel write here." This moment is historical and is included in 'log file sync '. And I don't think you have to redo misconfiguration. Waiting for 1ms to commit is ok. In OLTP you should have more than one validation in a user interaction so that the user don't worry not about 1 m in batch mode, unless you commit to each row, 1 DC to commit should not increase the total execution time.

The fact that you have a lot of line lock (enq: TX - line lock conflict) but very little time (on average 97 ms) is probably a sign that testers are running simultaneously a charge affecting the same data. Their set of test data is perhaps too simple and short. An example: when stress tests of an order entry system if you run 1000 concurrent sessions, ordering the same product to the same customer, you can get this kind of symptoms, but the test we unrealistic.

It's a high activity of 2000 calls per second, 52 transactions per second, user. But you also have low average active sessions, so the report probably covers a period of non-uniform activity, which makes the averages without meaning.

So note to tell about the events of waiting here. But we don't have any info about 39% of DB time devoted to the CPU which is where something can be improved.

Kind regards

Franck.

Tags: Database

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