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标签归档:index UNUSABLE
move lob导致index失效
在一次数据库升级过程中,因为blug需要move lob,导致表相关index失效,这里通过实验重现
数据库版本
SQL> select * from v$version; BANNER -------------------------------------------------------------------------------- Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production PL/SQL Release 11.2.0.4.0 - Production CORE 11.2.0.4.0 Production TNS for Linux: Version 11.2.0.4.0 - Production NLSRTL Version 11.2.0.4.0 - Production
创建用户
SQL> create user xff identified by oracle; User created. SQL> grant dba to xff; Grant succeeded.
创建测试表和插入数据
SQL> conn xff/oracle Connected. SQL> create table t_xff (id int primary key not null,name varchar2(20),c_lob clob); Table created. SQL> insert into t_xff values(1,'www.xifenfei.com','//www.xifenfei.com'); 1 row created. SQL> insert into t_xff values(2,'www.xifenfei.com','//www.xifenfei.com'); 1 row created. SQL> commit; Commit complete. SQL> select index_name,status from user_indexes; INDEX_NAME STATUS ------------------------------ -------- SYS_IL0000090094C00003$$ VALID SYS_C0011148 VALID
move lob
SQL> ALTER TABLE t_xff MOVE LOB (c_lob) store as (tablespace users); Table altered. SQL> select index_name,status from user_indexes; INDEX_NAME STATUS ------------------------------ -------- SYS_IL0000090094C00003$$ VALID SYS_C0011148 UNUSABLE SQL> insert into t_xff values(3,'www.xifenfei.com','//www.xifenfei.com'); insert into t_xff values(3,'www.xifenfei.com','//www.xifenfei.com') * ERROR at line 1: ORA-01502: index 'XFF.SYS_C0011148' or partition of such index is in unusable state
这里很明显,当我们move lob之后,表的index变为无效,插入操作无法进行
rebuind index
SQL> alter index xff.SYS_C0011148 rebuild; Index altered. SQL> select index_name,status from user_indexes; INDEX_NAME STATUS ------------------------------ -------- SYS_IL0000090094C00003$$ VALID SYS_C0011148 VALID SQL> insert into t_xff values(3,'www.xifenfei.com','//www.xifenfei.com'); 1 row created. SQL> commit; Commit complete.
这个测试就是告诫自己,做oracle 不要想当然,move lob之后,表相关的index 都会失效,需要rebuild。具体参见:
Bug 6525073 : STBH: INDEX IS IN UNUSABLE STATE AFTER A LOB COLUMN IS MOVED
ALTER TABLE MOVE LOB makes indexes unusable on the parent table (Doc ID 1228324.1)