How to troubleshooting high sys cpu usage ???

Question

how to troubleshooting high sys cpu usage ???

Answer 1

Hi,I have post the top 5 event above.
before tuning:
SQL ordered by Gets
•     Resources reported for PL/SQL code includes the resources used by all SQL statements called by the code.
•     Total Buffer Gets: 4,348,081
•     Captured SQL account for 73.3% of Total
Buffer Gets      Executions      Gets per Exec      %Total     CPU Time (s)     Elapsed Time (s)     SQL Id     SQL Module     SQL Text
1,768,970     2,593     682.21     40.68     32.47     1375.28     a2vm9mf99ma3p
       select
712,504     2,883     247.14     16.39     13.14     83.85     66vrg3gz2stvf
       select
130,928     7,901     16.57     3.01     7.83     10.49     ctnn0bpfd3v5k
       select
92,800     2,902     31.98     2.13     2.73     6.40     2985xzq8x547u
       select
81,498     27,159     3.00     1.87     3.12     3.98     1prkhshjp25sc
       select
60,513     2,631     23.00     1.39     2.29     5.64     2d8w9016z0kug
       select
55,416     15,835     3.50     1.27     2.12     2.39     8tk22zsappg9m
       select
44,879     15,838     2.83     1.03     1.74     1.89     c6sjzyfh9jmz0
       select
31,677     10,558     3.00     0.73     1.15     1.24     5yr7z98xmcpqz
       select
26,346     13,172     2.00     0.61     1.31     1.47     36shs0f8kxp5z
       select after tuning:
SQL ordered by Gets
•     Resources reported for PL/SQL code includes the resources used by all SQL statements called by the code.
•     Total Buffer Gets: 7,734,429
•     Captured SQL account for 99.4% of Total
Buffer Gets      Executions      Gets per Exec      %Total     CPU Time (s)     Elapsed Time (s)     SQL Id     SQL Module     SQL Text
1,728,723     99,759     17.33     22.35     113.87     119.45     309a6ak09rud2
       select
996,920     332,437     3.00     12.89     41.57     44.03     1prkhshjp25sc
       select
964,093     199,469     4.83     12.46     32.19     33.28     8tk22zsappg9m
       select
531,776     33,241     16.00     6.88     34.38     36.36     2985xzq8x547u
       select
432,140     199,473     2.17     5.59     20.86     21.57     c6sjzyfh9jmz0
       select
332,406     166,226     2.00     4.30     17.28     17.84     36shs0f8kxp5z
       select
265,872     33,234     8.00     3.44     7.74     8.09     4a34fa9tt90wx
       select *
232,617     33,243     7.00     3.01     7.54     7.78     53rvrd0ug5gwm
       select
232,603     33,237     7.00     3.01     9.24     9.83     9254c5ag3z9qd
       select
232,589     33,239     7.00     3.01     8.11     8.40     gum17w9qgrw8p
       select co
232,547     33,246     6.99     3.01     12.56     13.21     cx8yttzjh9ftz
       select
232,484     33,244     6.99     3.01     10.08     11.07     gbx7hs3ykpjqs
       select
199,446     99,753     2.00     2.58     11.27     11.89     2hpja5k312kwa
       select
199,428     33,241     6.00     2.58     9.15     9.56     2d8w9016z0kug
       select
199,389     199,469     1.00     2.58     19.59     20.25     b9j0pb2d5cn69
       select
133,004     33,253     4.00     1.72     17.56     18.67     a2vm9mf99ma3p
       select
99,756     33,255     3.00     1.29     3.77     3.92     5yr7z98xmcpqz
       select
99,747     33,258     3.00     1.29     4.58     4.70     1fnshqnqxjtqz
       select