案例如下：
数据库环境：Oracle数据库9.2.0.7 RAC。（注：由于数据库的事务量体别大，所以数据库没有进行备份）。
检查后发现的被截断表：
SQL> select object_name,object_type from dba_objects where object_name like 'IDL%';OBJECT_NAME OBJECT_TYPE------------------- ------------------IDL_CHAR$ TABLEIDL_SB4$TABLEIDL_UB1$TABLEIDL_UB2$TABLE
IDL_UB1$表是特别重要的字典表，只要出现故障，数据库就会出现大量的ORA-00600错误，所有事务将不能进行。
ORA-00600: internal error code, arguments: [17069],[0xC0000000DDDFA690], [], [], [], [], [], []
ORA-600 17069错误是一个特别难解决的问题，问题出现后数据库的某个跟踪日志很快就会出现暴涨的情况，因为IDL系列字典表是记录数据库对象编译信息的，丢失了其中的数据，所有过程、Package等都将无法执行。
字典表作用的说明：
IDL_UB1$ is one of four tables that hold compiled PL/SQL code:IDL_UB1$IDL_CHAR$IDL_UB2$IDL_SB4$'PL/SQL is based on the programming language Ada. As a result, PL/SQL uses avariant of Descriptive Intermediate Attributed Notation for Ada (DIANA), whichis a tree-structured intermediate language. It is defined using a meta-notationcalled Interface Definition Language (IDL). DIANA provides for communicationinternal to compilers and other tools.'At compile time, PL/SQL source code is translated into machine-readablem-code.Both the DIANA and m-code for a procedure or package are stored in thedatabase.At run time, they are loaded into the shared (memory) pool. The DIANA isused to compile dependent procedures; the m-code is simply executed.'These four tables hold the DIANA and the so-code m-code. I think 'm-code' isshort for machine-dependent byte code but there is a sizable machine-indenpendent partas well. If you have a look at sql.bsq, you can seethat Oracle documents the 'type' column of these tables as follows:part number not null,/* part: 0 = diana, 1 = portable pcode, 2 = machine-dependentpcode */
如果出现更为严重的情况，它将导致大量系统DBMS包失效，其重新编译也将更为复杂。
恢复数据库，消除所有ORA-600错误的方法：
恢复的方法是通过运行相关的脚本，重建和重新编译所有Procedure/Trigger/Package等对象，重新生成这些对象的DIANA和so-code m-code，主要包括catlog.sql,catproc.sql等脚本。
注意：即使以花费大量的时间为代价，一些ORA-00600错误也必须解决。
