[20190524]DISABLE TABLE LOCK(12c).txt

[20190524]disable table lock(12c).txt

--//如果禁止table lock时,一些ddl操作会被禁止.但是我有点吃惊的是增加字段不受限制.
--//链接:http://blog.itpub.net/267265/viewspace-2645161/=>[20190522]disable table lock.txt
--//昨天kerrycode给我反馈,10g和11g某个版本增加1列会遇到ora-00069错误.

1.环境:
scott@test01p> @ ver1
port_string                    version        banner                                                                               con_id
------------------------------ -------------- -------------------------------------------------------------------------------- ----------
ibmpc/win_nt64-9.1.0           12.2.0.1.0     oracle database 12c enterprise edition release 12.2.0.1.0 - 64bit production              0

scott@test01p> create table t as select rownum id from dual ;
table created.

scott@test01p> alter table t disable table lock;
table altered.

2.测试:
scott@test01p> truncate table t;
truncate table t
               *
error at line 1:
ora-00069: cannot acquire lock -- table locks disabled for t

scott@test01p> alter table t add v1 varchar2(10);
alter table t add v1 varchar2(10)
*
error at line 1:
ora-00069: cannot acquire lock -- table locks disabled for t

--//很明显11.2.0.4下存在问题,估计遇到了bug,我自己都无法理解在11.2.0.4下的测试结果.