进行在线创建索引操作时会话中断，索引处于中间状态。这时尝试删除、重建或rename该索引时，出现如下报错：

ora-08104:该索引对象216832正在被连接建立或重建

一般可以等SMON后台进程进行自动清理。也可以使用DBMS_REPAIR.ONLINE_INDEX_CLEAN进行手工清理。

语法：

DBMS_REPAIR.ONLINE_INDEX_CLEAN (

   object_id      IN BINARY_INTEGER DEFAULT ALL_INDEX_ID,

   wait_for_lock  IN BINARY_INTEGER DEFAULT LOCK_WAIT)

 RETURN BOOLEAN;

如果清理成功，返回TRUE；如果存在未清理成功的对象，则返回FALSE

wait_for_lock:

This parameter specifies whether to try getting DML locks on underlying table [[sub]partition] object. The default retries up to an internal retry limit, after which the lock get will give up. If LOCK_NOWAIT is specified, then the lock get does not retry.

简单调用：

SQL> conn / as sysdba

SQL> DECLARE

isClean BOOLEAN;

BEGIN

isClean := DBMS_REPAIR.ONLINE_INDEX_CLEAN();

END;

/

实际遇到的问题等了四十多分钟后自动清理的。查了一下SMON进程的trace文件，没有记录相关信息。

参考：

How to Cleanup and Rebuild an Interrupted Online Index Rebuild - ORA-8104 , ORA-8106 (Doc ID 272735.1)

https://docs.oracle.com/en/database/oracle/oracle-database/19/arpls/DBMS_REPAIR.html#GUID-1F9B7342-ADD5-43F8-BD20-38E629D21E8F