注意事项：

1. 必须以管理员身份登录；
2. sequence_owner必须为大写，不管你的用户名是否大写。只有大写才能识别。

--查看当前用户的所有序列    select SEQUENCE_OWNER,SEQUENCE_NAME from dba_sequences where sequence_owner='用户名';   --查询当前用户的序列总数    select count(*) from dba_sequences where sequence_owner='用户名';   --示例：    select SEQUENCE_OWNER,SEQUENCE_NAME from dba_sequences  where sequence_owner=’WGB;   select count(*) from dba_sequences where sequence_owner=’ WGB’;  SQL> select SEQUENCE_OWNER,SEQUENCE_NAME from dba_sequences where sequence_owner='CHES';SEQUENCE_OWNER          SEQUENCE_NAME--------------------   ---------------------------CHES                CHE_PACKAGE_SEQCHES                CHE_PART_SEQCHES                CHE_SCHEDULE_SEQCHES                CHE_TYPE_SEQSQL> select count(*) from dba_sequences where sequence_owner='CHES';     COUNT(*)   ----------     4