Request for interpretation of AWR sections

Question

Hi there
I am new to the world of AWRs and performance tuning.
Could someone please let me know how to interpret the following information in an AWR report:
Instance Efficiency Percentages (Target 100%)
Buffer Nowait %:
  100.00
Redo NoWait %:
  100.00
Buffer Hit %:
  99.98
In-memory Sort %:
  100.00
Library Hit %:
  99.07
Soft Parse %:
  98.73
Execute to Parse %:
  72.75
Latch Hit %:
  96.90
Parse CPU to Parse Elapsd %:
  76.90
% Non-Parse CPU:
  99.97
Time Model Statistics
Total time in database user-calls (DB Time): 134448s
Statistics including the word "background" measure background process time, and so do not contribute to the DB time statistic
Ordered by % or DB time desc, Statistic name
Statistic Name
Time (s)
% of DB Time
sql execute elapsed time
130,172.50
96.82
DB CPU
71,318.25
53.05
PL/SQL execution elapsed time
2,710.48
2.02
parse time elapsed
69.60
0.05
hard parse elapsed time
53.39
0.04
repeated bind elapsed time
25.46
0.02
PL/SQL compilation elapsed time
20.26
0.02
hard parse (sharing criteria) elapsed time
10.04
0.01
sequence load elapsed time
4.17
0.00
hard parse (bind mismatch) elapsed time
1.99
0.00
Wait Class
s - second
cs - centisecond - 100th of a second
ms - millisecond - 1000th of a second
us - microsecond - 1000000th of a second
ordered by wait time desc, waits desc
%Timeouts: value of 0 indicates value was < .5%. Value of null is truly 0
Wait Class
Waits
%Time -outs
Total Wait Time (s)
Avg wait (ms)
%Total Call Time
CPU time
71,318
53.05
Other
1,671,221
2
32,638
20
24.28
User I/O
7,330,309
0
28,679
4
21.33
System I/O
771,496
4,678
6
3.48
Wait Events
s - second
cs - centisecond - 100th of a second
ms - millisecond - 1000th of a second
us - microsecond - 1000000th of a second
ordered by wait time desc, waits desc (idle events last)
%Timeouts: value of 0 indicates value was < .5%. Value of null is truly 0
Event
Waits
%Time -outs
Total Wait Time (s)
Avg wait (ms)
Waits /txn
PX Deq Credit: send blkd
1,598,158
0
32,525
20
11.00
direct path read
199,076
9,380
47
1.37
db file sequential read
3,632,410
8,563
2
25.01
direct path read temp
714,772
5,375
8
4.92
db file scattered read
286,910
4,496
16
1.98
Based on these sections, what can be said about the database performance?
My manager has asked me to provide the analysis so I think just telling him that "all is well" may not be enough :-)
Best regards,

Answer 1

Sorry I know this AWR was for 24-hr period and as such is not very useful. The DB is not OLTP but for batch processing.
I spotted one query that has "  SELECT /*+ parallel(ABC 4) */ ... ". Would removing the "parallel" hint possibly improve?
The new server has 16CPUs vs the old one has 8. New one has 128GB of RAM and the old one has 32GB.
Sorry but what is the "top n cpu" section you have referred to above?
I just ran two reports for 30-min period and here is I see for both:
3:30pm to 4:00pm (when I see high CPU usage):
Instance Efficiency Percentages (Target 100%)
Buffer Nowait %:
  100.00
Redo NoWait %:
  100.00
Buffer Hit %:
  100.00
In-memory Sort %:
  100.00
Library Hit %:
  98.44
Soft Parse %:
  98.69
Execute to Parse %:
  59.63
Latch Hit %:
  93.83
Parse CPU to Parse Elapsd %:
  189.47
% Non-Parse CPU:
  100.00
Time Model Statistics
Statistic Name
Time (s)
% of DB Time
DB CPU
7,209.95
99.87
sql execute elapsed time
7,052.04
97.69
parse time elapsed
0.36
0.00
PL/SQL execution elapsed time
0.34
0.00
hard parse elapsed time
0.12
0.00
PL/SQL compilation elapsed time
0.04
0.00
hard parse (sharing criteria) elapsed time
0.04
0.00
hard parse (bind mismatch) elapsed time
0.02
0.00
connection management call elapsed time
0.02
0.00
repeated bind elapsed time
0.00
0.00
DB time
7,219.01
Wait Class
Wait Class
Waits
%Time -outs
Total Wait Time (s)
Avg wait (ms)
%Total Call Time
CPU time
7,210
99.87
System I/O
3,388
4
1
0.06
9:00am - 9:30am (High Wait time):
Instance Efficiency Percentages (Target 100%)
Buffer Nowait %:
  100.00
Redo NoWait %:
  100.00
Buffer Hit %:
  100.00
In-memory Sort %:
  100.00
Library Hit %:
  98.91
Soft Parse %:
  98.91
Execute to Parse %:
  63.54
Latch Hit %:
  100.00
Parse CPU to Parse Elapsd %:
  74.07
% Non-Parse CPU:
  99.98
Time Model Statistics
Statistic Name
Time (s)
% of DB Time
sql execute elapsed time
10,560.70
99.99
DB CPU
964.60
9.13
parse time elapsed
0.51
0.00
hard parse elapsed time
0.41
0.00
PL/SQL execution elapsed time
0.37
0.00
connection management call elapsed time
0.17
0.00
PL/SQL compilation elapsed time
0.07
0.00
sequence load elapsed time
0.01
0.00
hard parse (bind mismatch) elapsed time
0.00
0.00
hard parse (sharing criteria) elapsed time
0.00
0.00
repeated bind elapsed time
0.00
0.00
DB time
10,562.04
Wait Class
Wait Class
Waits
%Time -outs
Total Wait Time (s)
Avg wait (ms)
%Total Call Time
Other
30,720
0
8,678
282
82.16
Network
36,427,917
1,292
0
12.23
CPU time
965
9.13
Does this info gives better picture? I know this is a very very small portion of the report.
Best regards