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本版专家分：34结帖率 100% -
这样的环境：
Win2k AD+oracle8
两台x2.4g+2g ram做集群
运行一个c/s的系统
配合两个磁盘阵列（raid5，320g）
磁盘由os管理
数据大约是1kW条，数据量是150g左右（其中图片数据100G左右）
从6月开始出现这样的问题：
进行数据操作（查询、提取数据上报、业务操作），非常慢，到现在为止，进行一次业务操作，需要差不多5分钟（原来是几十秒）
而数据提取上报（上级服务器直连，提取），根本无法完成
现在系统已经到接近崩溃的境地了
经过检查，os的cpu和ram占用分别是30％，45％
还比较正常，而数据库和应用系统都没有什么问题
网络连接很正常，是40m的带宽，利用率不到10m
目前的表现主要是两个：
一个是授权，因为连接数到489个后，就无法连接了
一个是磁盘阵列，磁盘阵列的读写非常频繁（比以前大很多）
我们分析是因为磁盘阵列有问题造成系统的缓慢
但是数据备份所需要的时间和以前比，只增加少量（大约几分钟）
而检查授权，和原来没有什么差别，就出现这个问题了
所以，百思不得其解
这个到底是什么原因？
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版主本版专家分：1155
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- GitHub 绑定GitHub第三方账户获取
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- 进士 2006年 总版技术专家分年内排行榜第四
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- 金牌 2006年4月 总版技术专家分月排行榜第一
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- 铜牌 2006年3月 总版技术专家分月排行榜第三
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整理一下数据库碎片看看
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本版专家分：1206
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数据库慢.原因很多的,楼上说的就是一种,我的建议先用第三方工具,比如说toad
测一下系统的健康状况和运行情况,看看是什么原因导致的数据库缓慢,查到原因后再去做进一步处理,省的无的放矢,费了时间还没有效果
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本版专家分：9439
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- 红花 2008年1月 Oracle大版内专家分月排行榜第一
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蓝花
2007年12月 Oracle大版内专家分月排行榜第三
2007年9月 Oracle大版内专家分月排行榜第三
2007年8月 Oracle大版内专家分月排行榜第三
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查看v$session_wait表
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本版专家分：34
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由于我们的网络与互联网没有连接，so，需要回家上网才行
今天我查看了一下数据库磁盘，发现没有什么碎片
但是系统（操作系统）盘上面碎片非常多，
是否就是造成这个的原因？
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本版专家分：388 -
我觉得，磁盘空间占用的比较大，而且可能是磁盘碎片比较多。我有一次在执行sql的时候，看到放oracle的盘的空间，直接被占用了2G。经过整理，就恢复了
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本版专家分：15777
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- 进士 2007年 总版技术专家分年内排行榜第九
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- 铜牌 2007年7月 总版技术专家分月排行榜第三
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红花
2007年9月 Oracle大版内专家分月排行榜第一
2007年7月 Oracle大版内专家分月排行榜第一
2007年6月 Oracle大版内专家分月排行榜第一
2008年7月 Delphi大版内专家分月排行榜第一
2008年3月 Delphi大版内专家分月排行榜第一
2008年2月 Delphi大版内专家分月排行榜第一
2007年12月 Delphi大版内专家分月排行榜第一
2007年11月 Delphi大版内专家分月排行榜第一
2007年10月 Delphi大版内专家分月排行榜第一
2007年9月 Delphi大版内专家分月排行榜第一
2007年7月 Delphi大版内专家分月排行榜第一
2007年6月 Delphi大版内专家分月排行榜第一
2007年4月 Delphi大版内专家分月排行榜第一
2007年1月 Delphi大版内专家分月排行榜第一
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黄花
2009年5月 Delphi大版内专家分月排行榜第二
2007年8月 Oracle大版内专家分月排行榜第二
2007年4月 Oracle大版内专家分月排行榜第二
2008年1月 Delphi大版内专家分月排行榜第二
2007年8月 Delphi大版内专家分月排行榜第二
2007年5月 Delphi大版内专家分月排行榜第二
2007年3月 Delphi大版内专家分月排行榜第二
2007年2月 Delphi大版内专家分月排行榜第二
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如果查询包括100G图片的那个表的话，速度慢也是有可能的
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本版专家分：34
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查询是不包括图片的
图片数据是存放再另外一个表中
如果是图片的问题
我估计可能不大
应为原来也有这么多图片
数据每个月增加的不多，也就是几十～几百m的样子
磁盘已经进行了一次整理，似乎没有什么改观
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本版专家分：34
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下面是v$session_wait的内容
请求帮忙看看
SID SEQ# EVENT P1TEXT P1 P1RAW P2TEXT P2 P2RAW P3TEXT P3 P3RAW WAIT_TIME SECONDS_IN_WAIT STATE
1 1 13564 pmon timer duration 300 0000012C 0 00 0 00 0 33 WAITING
2 2 27093 rdbms ipc message timeout 300 0000012C 0 00 0 00 0 5 WAITING
3 3 20653 rdbms ipc message timeout 272 00000110 0 00 0 00 0 0 WAITING
4 6 28 rdbms ipc message timeout 180000 0002BF20 0 00 0 00 0 936 WAITING
5 17 35564 rdbms ipc message timeout 30000 00007530 0 00 0 00 0 239 WAITING
6 46 19672 rdbms ipc message timeout 30000 00007530 0 00 0 00 0 1446 WAITING
7 7 32711 rdbms ipc message timeout 30000 00007530 0 00 0 00 0 360 WAITING
8 4 14113 rdbms ipc message timeout 300 0000012C 0 00 0 00 0 0 WAITING
9 5 2347 smon timer sleep time 300 0000012C failed 0 00 0 00 0 236 WAITING
10 8 148 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 3202 WAITING
11 27 502 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 798 WAITING
12 26 1141 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 722 WAITING
13 25 397 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 728 WAITING
14 24 5292 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 1980 WAITING
15 23 16367 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 1372 WAITING
16 22 2475 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 2272 WAITING
17 21 690 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 2275 WAITING
18 20 106 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 2573 WAITING
19 18 1769 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 96 WAITING
20 44 502 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 2277 WAITING
21 43 1954 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 779 WAITING
22 42 422 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 3243 WAITING
23 41 49627 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 5200 WAITING
24 40 470 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 2322 WAITING
25 39 581 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 1305 WAITING
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本版专家分：34
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26 38 499 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 96 WAITING
27 37 36 SQL*Net message from client driver id 1413697536 54435000 #bytes 1 00000001 0 00 -2 0 WAITED UNKNOWN TIME
28 36 2777 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 1354 WAITING
29 68 157 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 2272 WAITING
30 67 177 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 2280 WAITING
31 66 635 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 1308 WAITING
32 65 1154 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 1390 WAITING
33 64 7707 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 3 WAITING
34 63 4551 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 2272 WAITING
35 60 186 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 1967 WAITING
36 59 433 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 10 WAITING
37 58 135 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 1980 WAITING
38 93 584 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 5058 WAITING
39 91 191 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 2270 WAITING
40 90 781 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 473 WAITING
41 89 13999 SQL*Net message from client driver id 1413697536 54435000 #bytes 1 00000001 0 00 0 7124 WAITING
42 88 49523 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 27 WAITING
43 84 1118 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 735 WAITING
44 82 157 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 80 WAITING
45 81 34999 SQL*Net message from client driver id 1413697536 54435000 #bytes 1 00000001 0 00 0 15 WAITING
46 79 102 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 2013 WAITING
47 120 1824 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 721 WAITING
48 119 529 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 5072 WAITING
49 118 16525 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 8 WAITING
50 117 24176 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 3279 WAITING
51 112 269 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 27 WAITING
52 111 1251 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 5138 WAITING
53 110 1157 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 1374 WAITING
54 108 1070 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 5135 WAITING
55 107 10957 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 93 WAITING
56 145 214 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 5199 WAITING
57 144 1003 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 5200 WAITING
58 143 1224 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 5072 WAITING
59 142 307 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 5200 WAITING
60 141 179 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 5058 WAITING
61 140 205 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 5123 WAITING
62 139 651 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 1995 WAITING
63 138 281 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 5125 WAITING
64 137 940 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 3230 WAITING
65 162 866 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 2272 WAITING
66 161 225 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 88 WAITING
67 160 214 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 1306 WAITING
68 159 151 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 4623 WAITING
69 158 38 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 5067 WAITING
70 157 113 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 5064 WAITING
71 156 86 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 5144 WAITING
72 155 142 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 5125 WAITING
73 154 734 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 5117 WAITING
74 196 150 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 24 WAITING
75 194 130 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 27 WAITING
76 193 430 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 0 WAITING
77 192 1702 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 0 WAITING
78 191 95 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 728 WAITING
79 190 324 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 739 WAITING
80 189 217 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 1073 WAITING
81 188 774 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 49 WAITING
82 187 1704 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 0 WAITING
83 186 1136 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 718 WAITING
84 185 9479 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 717 WAITING
85 184 209 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 1352 WAITING
86 183 555 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 713 WAITING
87 182 123 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 102 WAITING
88 181 920 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 2302 WAITING
89 180 4475 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 2347 WAITING
90 179 879 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 30 WAITING
91 178 993 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 2277 WAITING
92 177 2557 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 59 WAITING
93 176 53 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 4620 WAITING
94 175 438 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 4592 WAITING
95 174 799 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 4592 WAITING
96 173 464 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 4626 WAITING
97 172 2053 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 1354 WAITING
98 171 3753 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 2272 WAITING
99 170 311 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 1309 WAITING
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本版专家分：34
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100 169 272 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 4515 WAITING
101 168 535 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 4597 WAITING
102 167 262 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 80 WAITING
103 166 8401 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 1967 WAITING
104 165 6863 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 2312 WAITING
105 164 1119 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 4593 WAITING
106 163 365 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 2352 WAITING
107 153 149 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 4620 WAITING
108 152 671 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 5149 WAITING
109 151 1408 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 0 WAITING
110 150 2288 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 5117 WAITING
111 149 489 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 5125 WAITING
112 148 136 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 5058 WAITING
113 147 176 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 5171 WAITING
114 146 1103 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 5117 WAITING
115 136 303 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 5156 WAITING
116 135 933 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 5132 WAITING
117 134 192 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 5136 WAITING
118 131 1486 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 99 WAITING
119 130 364 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 5137 WAITING
120 127 332 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 5125 WAITING
121 122 327 SQL*Net message from client driver id 1413697536 54435000 #bytes 1 00000001 0 00 0 0 WAITING
122 121 1551 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 5125 WAITING
123 106 286 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 10 WAITING
124 105 7280 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 70 WAITING
125 102 842 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 15 WAITING
126 101 1164 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 0 WAITING
127 99 1764 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 795 WAITING
128 98 961 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 74 WAITING
129 96 850 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 10 WAITING
130 95 41085 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 5114 WAITING
131 78 1116 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 5138 WAITING
132 75 147 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 1313 WAITING
133 74 339 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 737 WAITING
134 73 88 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 1972 WAITING
135 72 147 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 1958 WAITING
136 71 17378 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 45 WAITING
137 70 155 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 24 WAITING
138 69 715 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 27 WAITING
139 57 275 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 713 WAITING
140 56 1530 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 1963 WAITING
141 55 256 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 2339 WAITING
142 53 264 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 1327 WAITING
143 52 791 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 1305 WAITING
144 51 1068 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 2302 WAITING
145 49 189 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 2275 WAITING
146 47 206 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 2577 WAITING
147 35 135 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 1079 WAITING
148 34 22551 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 8 WAITING
149 33 193 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 1331 WAITING
150 32 46 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 12 WAITING
151 31 426 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 0 WAITING
152 30 469 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 10 WAITING
153 29 4150 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 1364 WAITING
154 28 177 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 1984 WAITING
155 9 235 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 4503 WAITING
156 11 780 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 1309 WAITING
157 12 2010 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 96 WAITING
158 13 713 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 1986 WAITING
159 14 42067 SQL*Net message from client driver id 1413697536 54435000 #bytes 1 00000001 0 00 0 8123 WAITING
160 15 40 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 1963 WAITING
161 16 85 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 4653 WAITING
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本版专家分：34
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问题解决了
是有个和c/s运行有关,但是无需备份的中间表,因为磁盘碎片比较多，造成读写慢，从而造成办理业务慢，而备份无需备份此数据，故没有问题