什么是MLSLABEL Oracle数据类型?

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我在oracle中遇到了一个奇怪的数据类型，称为MLSLABEL.它未在数据类型docs上列出，仅对受信任的oracle"有效(无论如何).我可以找到的文档是此.什么是MLSLABEL，它做什么用?

I've come across a strange datatype in oracle called MLSLABEL. It's not listed on datatype docs, and is only valid for 'trusted oracle' (whatever that is). The documentation I could find on it is this. What is MLSLABEL, and what does it do?

推荐答案

MLSLABEL是(曾经是)Oracle Advanced Security Option的前身Trusted Oracle使用的数据类型.管理员文档说，出于兼容性考虑，它已包含在常规Oracle中. 了解详情.

MLSLABEL is (was?) a datatype used by Trusted Oracle, the foreunner of Oracle's Advanced Security Option. The Admin docs say it was included in regular Oracle for compatibility. Find out more.

使用Oracle 9i(我认为)将ASO取代了受信任的Oracle品牌.我不认为ASO中使用了MLSLABEL(在相关文档中找不到任何内容).现代版本的数据库仍支持该功能.可能是为了向后兼容:

Trusted Oracle as a brand was replaced by ASO with Oracle 9i (I think). I don't think MLSLABEL is used in ASO (I can't find anything in the relevant docs). It is still supported in modern versions of the database. probably for backwards compatibility:

SQL> select * from v$version; BANNER ----------------------------------------------------------------------------- Oracle Database 11g Enterprise Edition Release 11.1.0.6.0 - Production PL/SQL Release 11.1.0.6.0 - Production CORE 11.1.0.6.0 Production TNS for 32-bit Windows: Version 11.1.0.6.0 - Production NLSRTL Version 11.1.0.6.0 - Production SQL> create table mls (id number, lbl mlslabel); Table created. SQL>