也有人反对，这样说来，创建 10046 和 10053 的 trace 文件也是反向工程(我认识的很多 dba 也热衷于研究 Oracle "internal"的dong) ? 不是也有很多工具可以读取微软的　office　文档的么? 另外有人提问说：Quest 公司的 Shareplex 也是 Illegal ? 每一条还是基本上都有解释的，比如关于 10046 跟踪文件的创建：

Such traces are provided by Oracle without the use or construction of third-party tools. As you've stated the explanation of the trace symbols is provided by Oracle Corporation; Oracle provides these traces to enable a DBA to properly tune queries and the database. This, in my mind, is a far different situation than knowingly writing a replacement, albeit incomplete, of DUL.

不过，接下来 d.c.b.a 的发言似乎是不打自招：

I wrote a tool to do os dump of binary file, just like od, and the I issue the "alter system dump datafile ..." command, then compair and found the location, after multiple times, I can locate the most of key bytes in block, Oracle should use a relative simple rule to format block to keep high effectivity, so after tried many times I found out some rules.

两点思考:

• 有的时候，还是闷声发大财为好......
• Steve Adams 这样的高手为什么不自己写一个类似 DUL 的工具出来?