oracle查询字符集语句分享

select from v$nls_parameters  where parameter='NLS_CHARACTERSET'
select from  nls_database_parameters where parameter='NLS_CHARACTERSET'
select from props$ where name='NLS_CHARACTERSET'

select from  nls_database_parameters where parameter='NLS_NCHAR_CHARACTERSET'
select from  nls_database_parameters where parameter='NLS_NCHAR_CHARACTERSET'
select from props$ where name='NLS_NCHAR_CHARACTERSET'

select userenv('language') from dual

 --DataFile联机
ALTER TABLESPACE BSS11 ONLINE
ALTER DATABASE 'BSS_03.dbf' ONLINE

--DataFile脱机
ALTER TABLESPACE BSS11 OFFLINE      --作用对象表空间BSS11的所有datafile
ALTER DATABASE 'BSS_03.dbf' OFFLINE  ---作用对象BSS_03.dbf，就一个datafile

--resize datafile
ALTER DATABASE DATAFILE 'BSS_03.dbf' RESIZE 500M;