oracle数据库重要的查询语句

查看所有数据文件（dbf文件）的存放位置

SQL> select name from v$datafile;

标红色的为默认表空间文件

SQL> select name from v$datafile;

NAME
--------------------------------------------------------------------------------
/home/oracle/app/oracle/oradata/helowin/system01.dbf
/home/oracle/app/oracle/oradata/helowin/sysaux01.dbf
/home/oracle/app/oracle/oradata/helowin/undotbs01.dbf
/home/oracle/app/oracle/oradata/helowin/users01.dbf
/home/oracle/app/oracle/oradata/helowin/example01.dbf
/oracle-tablespace/brdb_1031_tablespace.dbf

6 rows selected.

SQL>

 查看数据库的字符集

SQL> select userenv('language') from dual;

SQL> select userenv('language') from dual;

USERENV('LANGUAGE')
----------------------------------------------------
AMERICAN_AMERICA.AL32UTF8

查看系统中所有的路径信息

SQL> select * from dba_directories;

查询数据库用户信息

SQL> select * from dba_users;

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