Performance Problem.

Need some help on this.


We have a peoplesoft environment here that seems to have performance
issues every so often.

When this happens performance comes to s standstill for everyone and a
SQL*Plus query that takes about 6-7 seconds normally takes about 13
minutes. During this time it will pretty much wait for sequential reads
only. 
I have not yet had the chance to install statspack yet and we are not
licensed for AWR.
We are on oracle 10.2.0.3 on solaris 64bit

When I check the database quickly (needs to be done quickly as business
dictates a reboot at the moment) I do not see any obvious reasons why
this would be happening.
On unix the admins see quite a large increase in use of semaphores.

After the reboot the problems seem to disappear for several weeks/months

Has anyone seen something similar before and found out why this is
happening.


Brgds


Jack
00:00:00 msg/s sema/s
00:05:00 15.19 17.37
00:05:00 16.03 19.85
00:10:00 15.30 16.88
00:15:00 15.20 16.74
00:20:00 15.28 16.33
00:25:00 15.18 16.69
00:30:00 15.29 16.64
00:35:00 15.20 16.77
00:40:00 15.29 16.50
00:45:00 15.20 16.38
00:50:00 15.29 16.85
00:55:00 15.20 16.10
01:00:00 15.29 16.38
01:05:00 15.98 18.36
01:10:00 15.27 17.00
01:15:00 15.20 16.11
01:20:00 15.30 16.87
01:25:00 15.21 16.78
01:30:00 15.28 16.39
01:35:00 15.21 16.62
01:40:00 15.24 16.37
01:45:00 15.25 16.69
01:50:00 15.22 16.46
01:55:00 15.25 16.48
02:00:00 15.26 16.77
02:05:00 15.24 24.18
02:10:00 15.23 17.22
02:15:00 15.25 16.10
02:20:01 15.21 16.84
02:25:00 18.13 38.54
02:30:00 15.41 5314.39
02:35:00 14.98 8429.98
02:40:00 15.65 3357.07
02:45:00 15.31 2490.93
02:50:00 15.65 3482.85
02:55:00 15.73 148.26
03:00:00 15.08 171.86
03:05:00 15.21 183.91
03:10:00 14.92 294.01
03:15:00 15.00 468.95
03:20:00 14.93 520.64
03:25:00 15.01 412.20
03:30:00 14.92 447.94
03:35:00 15.00 424.45
03:40:00 14.94 431.55
03:45:00 15.01 456.17
03:50:01 14.93 411.22
03:55:00 15.00 391.96
04:00:00 14.92 394.48
04:05:00 15.00 498.71
04:10:00 14.94 570.89
04:15:00 15.00 522.34
04:20:00 15.74 400.65
04:25:00 15.34 428.68
04:30:00 14.96 430.52
04:35:00 14.97 472.91
04:40:00 16.23 254.53
04:45:00 15.47 198.73
04:50:00 15.53 198.35
04:55:00 15.99 190.24
05:00:00 16.42 209.91
05:05:00 16.22 174.31
05:10:00 15.94 140.37
05:15:00 15.52 106.79
05:20:00 15.51 329.76
05:25:00 15.90 303.13
05:30:00 15.40 534.14
05:35:00 16.42 577.82
05:40:00 17.19 584.08
05:45:00 15.01 48.89
05:50:00 15.71 69.60
05:55:00 14.93 68.07
06:00:00 15.15 68.18
06:05:00 14.94 70.65
06:05:00 14.17 20.47
06:10:00 15.01 16.73
06:15:00 14.92 16.64
06:20:00 15.00 18.19
06:25:00 15.07 17.92
06:30:00 15.02 47.48
06:35:00 14.92 77.07
06:40:01 15.75 86.36
06:45:00 15.81 42.92
06:50:00 15.44 61.03
06:55:00 16.15 35.05
07:00:00 16.73 98.17
07:05:00 15.13 36.37
07:10:00 15.27 34.78
07:15:00 15.10 221.79
07:20:00 14.99 134.22
07:25:00 15.18 5043.76
07:30:00 15.41 61.87
07:35:01 16.78 68.32
07:40:00 15.76 77.19
07:45:00 15.25 35.46
07:50:00 15.21 27.88
07:55:01 15.26 21.13
08:00:00 15.27 16.33
08:05:00 15.24 16.91
08:10:01 15.99 17.44
08:15:00 15.55 16.72
08:20:00 15.51 16.90
08:25:00 15.53 17.25
08:30:00 15.46 16.53
08:35:00 15.99 17.27
08:40:00 15.35 17.08
08:45:00 17.14 17.50
08:50:01 15.98 19.26
08:55:00 15.50 22.11
09:00:00 16.13 23.00
09:05:00 17.20 26.45
09:10:00 15.00 162.57
09:15:00 16.40 152.22
09:20:00 15.85 637.20
09:25:00 13.10 25387.19
09:30:00 15.77 5485.02
09:35:00 16.88 4685.59
09:40:00 18.28 4743.99
09:45:00 15.72 470.47
09:50:01 16.72 493.55
09:55:00 15.61 646.27
10:00:00 16.61 590.49
10:05:00 16.63 1078.74
10:10:00 16.98 2303.44 -----> stop/start Psoft/Ost and oracle from 10:15
- 10:27am <---- semaphore back to normal rates.
10:15:00 15.82 17.97
10:20:00 9.27 16.40
10:25:01 3.43 8.64
10:30:00 17.49 17.85
10:35:00 17.52 17.81
10:40:00 16.38 18.27
10:45:01 15.21 17.25
10:50:00 16.32 17.78
10:55:00 15.42 17.84
11:00:00 16.84 18.47
11:05:00 17.00 18.27


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