需求：默认无法直接删除Oracle的users表空间，直接尝试删除会有报错如下：
SQL> drop tablespace users including contents and datafiles; drop tablespace users including contents and datafiles * ERROR at line 1: ORA-12919: Can not drop the default permanent tablespace
报错很明确，USERS目前作为数据库目前默认的永久表空间，暂不支持直接删除。
进一步查询，看到有很多用户的确是默认用到了USERS表空间：
SQL> USERNAME DEFAULT_TABLESPACE CREATED ------------------------------ ------------------------------ --------- SYSRAC USERS 04-JAN-23 SYSTEM SYSTEM 04-JAN-23 SYSBACKUP USERS 04-JAN-23 AUDSYS USERS 04-JAN-23 SYSKM USERS 04-JAN-23 SYS SYSTEM 04-JAN-23 SYSDG USERS 04-JAN-23 OUTLN SYSTEM 04-JAN-23 GSMADMIN_INTERNAL SYSAUX 04-JAN-23 GSMUSER USERS 04-JAN-23 DIP USERS 04-JAN-23 USERNAME DEFAULT_TABLESPACE CREATED ------------------------------ ------------------------------ --------- XS$NULL SYSTEM 04-JAN-23 REMOTE_SCHEDULER_AGENT USERS 04-JAN-23 DBSFWUSER SYSAUX 04-JAN-23 ORACLE_OCM USERS 04-JAN-23 SYS$UMF USERS 04-JAN-23 DBSNMP SYSAUX 04-JAN-23 APPQOSSYS SYSAUX 04-JAN-23 GSMCATUSER USERS 04-JAN-23 GGSYS SYSAUX 04-JAN-23 XDB SYSAUX 04-JAN-23 ANONYMOUS SYSAUX 04-JAN-23 USERNAME DEFAULT_TABLESPACE CREATED ------------------------------ ------------------------------ --------- WMSYS SYSAUX 04-JAN-23 OJVMSYS USERS 04-JAN-23 CTXSYS SYSAUX 04-JAN-23 MDSYS SYSAUX 04-JAN-23 ORDSYS USERS 04-JAN-23 ORDDATA USERS 04-JAN-23 ORDPLUGINS USERS 04-JAN-23 SI_INFORMTN_SCHEMA USERS 04-JAN-23 OLAPSYS SYSAUX 04-JAN-23 MDDATA USERS 04-JAN-23 APEX_180200 SYSAUX 04-JAN-23 USERNAME DEFAULT_TABLESPACE CREATED ------------------------------ ------------------------------ --------- FLOWS_FILES SYSAUX 04-JAN-23 APEX_PUBLIC_USER USERS 04-JAN-23 APEX_INSTANCE_ADMIN_USER USERS 04-JAN-23 PDBADMIN USERS 04-JAN-23 HR SYSAUX 04-JAN-23 JINGYU USERS 06-JAN-23 TEAM USERS 01-MAR-23 40 rows selected.
但现在XTTS测试，客户现有源端的users表空间也需要迁移（有用户数据，注意我们并不推荐在users存放用户数据）
如果真想删除，也是可以的，就是修改默认表空间，但还需要考虑USERS里面是否有数据要迁移，比较麻烦。
现场实施的兄弟提出能否重命名users表空间，这是个好主意，实测是OK，操作也很简单，一条语句搞定：
SQL> alter tablespace users rename to user1; Tablespace altered.
瞬间执行完成，然后再查用户的默认表空间，也已经从users已经变成user1：
SQL> select USERNAME, DEFAULT_TABLESPACE, CREATED from dba_users order by 3; USERNAME DEFAULT_TABLESPACE CREATED ------------------------------ ------------------------------ --------- SYSRAC USER1 04-JAN-23 SYSTEM SYSTEM 04-JAN-23 SYSBACKUP USER1 04-JAN-23 AUDSYS USER1 04-JAN-23 SYSKM USER1 04-JAN-23 SYS SYSTEM 04-JAN-23 SYSDG USER1 04-JAN-23 OUTLN SYSTEM 04-JAN-23 GSMADMIN_INTERNAL SYSAUX 04-JAN-23 GSMUSER USER1 04-JAN-23 DIP USER1 04-JAN-23 USERNAME DEFAULT_TABLESPACE CREATED ------------------------------ ------------------------------ --------- XS$NULL SYSTEM 04-JAN-23 REMOTE_SCHEDULER_AGENT USER1 04-JAN-23 DBSFWUSER SYSAUX 04-JAN-23 ORACLE_OCM USER1 04-JAN-23 SYS$UMF USER1 04-JAN-23 DBSNMP SYSAUX 04-JAN-23 APPQOSSYS SYSAUX 04-JAN-23 GSMCATUSER USER1 04-JAN-23 GGSYS SYSAUX 04-JAN-23 XDB SYSAUX 04-JAN-23 ANONYMOUS SYSAUX 04-JAN-23 USERNAME DEFAULT_TABLESPACE CREATED ------------------------------ ------------------------------ --------- WMSYS SYSAUX 04-JAN-23 OJVMSYS USER1 04-JAN-23 CTXSYS SYSAUX 04-JAN-23 MDSYS SYSAUX 04-JAN-23 ORDSYS USER1 04-JAN-23 ORDDATA USER1 04-JAN-23 ORDPLUGINS USER1 04-JAN-23 SI_INFORMTN_SCHEMA USER1 04-JAN-23 OLAPSYS SYSAUX 04-JAN-23 MDDATA USER1 04-JAN-23 APEX_180200 SYSAUX 04-JAN-23 USERNAME DEFAULT_TABLESPACE CREATED ------------------------------ ------------------------------ --------- FLOWS_FILES SYSAUX 04-JAN-23 APEX_PUBLIC_USER USER1 04-JAN-23 APEX_INSTANCE_ADMIN_USER USER1 04-JAN-23 PDBADMIN USER1 04-JAN-23 HR SYSAUX 04-JAN-23 JINGYU USER1 06-JAN-23 TEAM USER1 01-MAR-23 40 rows selected.
查询数据库默认永久表空间也都变成了USER1：
SQL> SELECT PROPERTY_VALUE FROM DATABASE_PROPERTIES WHERE PROPERTY_NAME = 'DEFAULT_PERMANENT_TABLESPACE'; 2 3 PROPERTY_VALUE ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ USER1
