环境
OS： SunOS HOSTNAME 5.10 Generic_127111-11 sun4u sparc SUNW,Sun-Fire-V890
DB：Oracle9i Enterprise Edition Release 9.2.0.8.0 - Production

问题：一个包处于无效状态，通常直接用命令编译一下，就行了，但这个简单的操作，却碰到:
SQL> alter package SCHEMA.PACKAGENAME compile;
alter package SCHEMA.PACKAGENAME compile
*
ERROR at line 1:
ORA-04043: object SYS_PLSQL_6459_DUMMY_2 does not exist

这个错误，其实在9i里这是比较常见的错误，在SP里定义：TYPE和TABLE OF TYPE的数据对象时.Oracle就会自动的在系统内生成SYS_PLSQL_%对象,好象Pipeline也会产生.当找到不这些SYS_PLSQL对象时，这个SP就无法通过编译了.

SQL> select 'drop type SCHEMA.'||object_name||' force;' from dba_objects where object_name like 'SYS_PLSQL_6459%';
drop type SCHEMA.SYS_PLSQL_6459_15_1 force;
drop type SCHEMA.SYS_PLSQL_6459_DUMMY_1 force;

这里确实没有错误提示里所指的对象。

解决办法,把这个SP对应的SYS_PLSQL对象全删除：
SQL> drop type SCHEMA.SYS_PLSQL_6459_15_1 force;

Type dropped.

SQL> drop type SCHEMA.SYS_PLSQL_6459_DUMMY_1 force;

Type dropped.

SQL> alter package SCHEMA.PACKAGENAME compile;

Package altered.

确认一下，有没有重新生成SYS_PLSQL:

SQL> select 'drop type SCHEMA.'||object_name||' force;' from dba_objects where object_name like 'SYS_PLSQL_6459%';
drop type SCHEMA.SYS_PLSQL_6459_DUMMY_2 force;
drop type SCHEMA.SYS_PLSQL_6459_15_2 force;
drop type SCHEMA.SYS_PLSQL_6459_DUMMY_2 force;

这就对应Package header里定义了三个TYPE:
TYPE invcur_t IS REF CURSOR RETURN trinvoicemaster%ROWTYPE;
TYPE inv_lines IS TABLE OF trinvoicemaster%ROWTYPE;
FUNCTION split_invoice ( cur_invoicemast in invcur_t ) RETURN inv_lines pipelined;

要删除这些SYS_PLSQL有时比较难的，记得有次用命令死活也删除不了，最后借助TOAD，在图形里把它删除了。Package所引用的SYS_PLSQL对象怎么会不见了，我记得这是一个BUG. 10G之后，就没有碰到这个问题了。