Chapter 05–Using Data Dictionary and Dynamic Performance.txt
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data dictionary
stored in the system tablespace
owned by the user sys
read-only
when DDL statement is executed
由base tables(sql.bsq)和data dictionary views(catalog.sql)构成
静态：
USER_XXX
ALL_XXX
DBA_XXX
预览表 desc dictionary
dynamic performance tables (虚表，存在内存与控制文件里的信息以表的形式
表现出来)
动态：
V$XXX
预览表 desc V$FIXED_TABLE
一般普通用户查询不了这种表，性能调优查看
查看数据字典通常是你要先知道想查看的表名，然后desc一下，有必要col 字段名
format a50，再select查看想要的字段，具体字段参数的含义就要查联机文档了（
reference）
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