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从Load profile数据对比来看，应用调整后系统负载有一定的提高，同时每事务逻辑读也有一定的增加（不足10%）。这会是个问题吗？

从第2份数据来看，latch: shared pool 和 latch: library cache有明显的增加。

下面的是性能问题更加严重的时候的AWR数据（采集时长为2小时）：

              Snap Id      Snap Time      Sessions Curs/Sess
            --------- ------------------- -------- ---------
Begin Snap:      3744 26-Sep-11 09:00:01     4,504      38.2
  End Snap:      3748 26-Sep-11 11:00:26     4,916      52.7
   Elapsed:              120.41 (mins)
   DB Time:           21,868.27 (mins)

Cache Sizes
~~~~~~~~~~~                       Begin        End
                             ---------- ----------
               Buffer Cache:    35,840M    35,840M  Std Block Size:         8K
           Shared Pool Size:     6,144M     6,144M      Log Buffer:    30,632K

Load Profile
~~~~~~~~~~~~                            Per Second       Per Transaction
                                   ---------------       ---------------
                  Redo size:          1,790,430.57              5,945.33
              Logical reads:          1,162,875.15              3,861.46
              Block changes:            154,064.15                511.59
             Physical reads:              3,007.80                  9.99
            Physical writes:                337.21                  1.12
                 User calls:              8,227.28                 27.32
                     Parses:              3,603.24                 11.96
                Hard parses:                 11.25                  0.04
                      Sorts:              7,304.40                 24.26
                     Logons:                 11.27                  0.04
                   Executes:             25,994.53                 86.32
               Transactions:                301.15

  % Blocks changed per Read:   13.25    Recursive Call %:    82.87
 Rollback per transaction %:    0.21       Rows per Sort:     8.14

Instance Efficiency Percentages (Target 100%)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
            Buffer Nowait %:   99.99       Redo NoWait %:  100.00
            Buffer  Hit   %:   99.75    In-memory Sort %:  100.00
            Library Hit   %:   99.94        Soft Parse %:   99.69
         Execute to Parse %:   86.14         Latch Hit %:   98.90
Parse CPU to Parse Elapsd %:   14.69     % Non-Parse CPU:   84.51

 Shared Pool Statistics        Begin    End
                              ------  ------
             Memory Usage %:   95.48   94.33
    % SQL with executions>1:   87.63   74.92
  % Memory for SQL w/exec>1:   86.52   74.66

Top 5 Timed Events                                         Avg %Total
~~~~~~~~~~~~~~~~~~                                        wait   Call
Event                                 Waits    Time (s)   (ms)   Time Wait Class
------------------------------ ------------ ----------- ------ ------ ----------
latch: shared pool                  991,918     274,715    277   20.9 Concurrenc
latch: library cache                941,443     232,344    247   17.7 Concurrenc
CPU time                                        212,150          16.2
cursor: pin S                  ############     115,049      0    8.8      Other
latch: cache buffers lru chain    1,106,570      96,442     87    7.4      Other
          -------------------------------------------------------------
^LWait Events                         DB/Inst: CRM2DB/crm2db1  Snaps: 3744-3748
-> 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

                                                                  Avg
                                            %Time  Total Wait    wait     Waits
Event                                 Waits -outs    Time (s)    (ms)      /txn
---------------------------- -------------- ----- ----------- ------- ---------
latch: shared pool                  991,918   N/A     274,715     277       0.5
latch: library cache                941,443   N/A     232,344     247       0.4
cursor: pin S                 9,095,470,035   N/A     115,049       0   4,180.5
latch: cache buffers lru cha      1,106,570   N/A      96,442      87       0.5
db file sequential read           7,819,285   N/A      49,564       6       3.6
latch: cache buffers chains         511,936   N/A      35,753      70       0.2
latch free                           95,257     0      14,609     153       0.0
latch: object queue header o        221,907   N/A      14,378      65       0.1
log file sync                     2,156,343     1      11,496       5       1.0
cursor: pin S wait on X             422,320   100       4,603      11       0.2
gc cr grant 2-way                 3,526,856     0       3,430       1       1.6
db file scattered read              624,480   N/A       3,083       5       0.3
enq: TX - row lock contentio          5,946    88       2,600     437       0.0
latch: row cache objects             16,983   N/A       2,281     134       0.0
SQL*Net message from dblink       1,284,487   N/A       2,179       2       0.6
gc buffer busy                      353,228     0       2,054       6       0.2
gc cr multi block request         2,499,709     0       1,974       1       1.1
gc current block 2-way            1,969,516     0       1,920       1       0.9
SQL*Net more data from clien      1,667,513   N/A       1,914       1       0.8
control file sequential read      2,974,349   N/A       1,735       1       1.4
db file parallel read               230,795   N/A       1,645       7       0.1
log file parallel write           1,581,432   N/A       1,303       1       0.7
Backup: sbtbackup                        14   N/A         730   52120       0.0
buffer busy waits                   143,869     0         488       3       0.1
latch: library cache lock             5,058   N/A         378      75       0.0
enq: HW - contention                 22,039     0         370      17       0.0
gc current grant 2-way              424,243   N/A         357       1       0.2
enq: SQ - contention                  5,010     1         354      71       0.0
read by other session                50,153     0         339       7       0.0
direct path read                    324,226   N/A         305       1       0.1
db file parallel write              207,793   N/A         274       1       0.1
row cache lock                      175,301     0         263       1       0.1
          

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