Database tuning with Time Model Statistics

Question

How can we use V$SESS_TIME_MODEL and V$SYS_TIME_MODEL or DB_TIME to daignose/tune the database

Answer 1

Tnx Jaffar,
I know the description of each column for dynamic performance views.
My question is how can we get any meaningful information which can help interpreting problem or possible solution in the DB.
For instance look at the output from V$SYS_TIME_MODEL from one of the production Database.How can I use that information to good use.
3649082374 DB time                                                             855657150735
2748282437 DB CPU                                                              270642990896
4157170894 background elapsed time                                             511263826646
2451517896 background cpu time                                                 128007010158
4127043053 sequence load elapsed time                                             102151062
1431595225 parse time elapsed                                                  105369068246
372226525 hard parse elapsed time                                              91457461637
2821698184 sql execute elapsed time                                            694544980733
1990024365 connection management call elapsed time                                933285066
1824284809 failed parse elapsed time                                             3890881196
4125607023 failed parse (out of shared memory) elapsed time                               0
3138706091 hard parse (sharing criteria) elapsed time                             113740639
268357648 hard parse (bind mismatch) elapsed time                                  8999669
2643905994 PL/SQL execution elapsed time                                        32792584918
290749718 inbound PL/SQL rpc elapsed time                                        122796155
1311180441 PL/SQL compilation elapsed time                                        103310315
751169994 Java execution elapsed time                                                    0
1159091985 repeated bind elapsed time                                              45211144
2411117902 RMAN cpu time (backup/restore)                                      100789016188