時間的痕跡

今天在做一個程序性能提升時發現otl_stream.第一個參數buffer size 對性能影響很大,以下是幾個測試數據.
參考: http://otl.sourceforge.net/otl3_stream_class.htm
50   2.06
<1:536704> 18:31:58.068 [00001] The load SQL is [select USER_NUMBER from dr_gsm_931_20050831 where 1=1 ]
<1:536704> 18:34:04.713 [00001] There are 3612066 records is loaded!

100 1.38
<1:2085112> 18:36:23.727 [00001] The load SQL is [select USER_NUMBER from dr_gsm_931_20050831 where 1=1 ]
<1:2085112> 18:38:01.923 [00001] There are 3612066 records is loaded!
1.23
<1:2085112> 18:38:06.941 [00001] The load SQL is [select USER_NUMBER from dr_gsm_931_20050831 where 1=1 ]
<1:2085112> 18:39:29.849 [00001] There are 3612066 records is loaded!

200  1.02
<1:1499250> 18:41:47.711 [00001] The load SQL is [select USER_NUMBER from dr_gsm_931_20050831 where 1=1 ]
<1:1499250> 18:42:49.300 [00001] There are 3612066 records is loaded!
<1:1499250> 18:42:54.312 [00001] The load SQL is [select USER_NUMBER from dr_gsm_931_20050831 where 1=1 ]
<1:1499250> 18:43:53.717 [00001] There are 3612066 records is loaded!
500  0.43
<1:1978536> 18:45:57.790 [00001] The load SQL is [select USER_NUMBER from dr_gsm_931_20050831 where 1=1 ]
<1:1978536> 18:46:40.685 [00001] There are 3612066 records is loaded!
<1:1978536> 18:45:09.982 [00001] The load SQL is [select USER_NUMBER from dr_gsm_931_20050831 where 1=1 ]
<1:1978536> 18:45:52.787 [00001] There are 3612066 records is loaded!
1000  0.35
<1:1597632> 18:47:42.973 [00001] The load SQL is [select USER_NUMBER from dr_gsm_931_20050831 where 1=1 ]
<1:1597632> 18:48:17.715 [00001] There are 3612066 records is loaded!
<1:1597632> 18:48:22.718 [00001] The load SQL is [select USER_NUMBER from dr_gsm_931_20050831 where 1=1 ]
<1:1597632> 18:49:01.119 [00001] There are 3612066 records is loaded!
<1:1597632> 18:51:17.837 [00001] The load SQL is [select USER_NUMBER from dr_gsm_931_20050831 where 1=1 ]
<1:1597632> 18:51:24.416 [10001] Signal 31 recieved.
<1:1597632> 18:49:49.976 [00001] The load SQL is [select USER_NUMBER from dr_gsm_931_20050831 where 1=1 ]
<1:1597632> 18:50:28.192 [00001] There are 3612066 records is loaded!

2000  0.34
<1:2883830> 18:51:47.365 [00001] The load SQL is [select USER_NUMBER from dr_gsm_931_20050831 where 1=1 ]
<1:2883830> 18:52:21.163 [00001] There are 3612066 records is loaded!
<1:2883830> 18:52:26.166 [00001] The load SQL is [select USER_NUMBER from dr_gsm_931_20050831 where 1=1 ]
<1:2883830> 18:53:01.576 [00001] There are 3612066 records is loaded!