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select count(1) from dictionary;
select * from dba_data_files;
select count(1) from dba_objects t where t.owner='BESTTONE';
select * from dba_tablespaces t where t.tablespace_name='BESTTONE';
select count(1) from dba_tables t where t.owner='BESTTONE';
select t.table_name,t.comments from dictionary t where t.table_name like 'V$%';
select * from dba_constraints;
select * from dba_cons_columns;
select * from dba_tablespaces t where t.tablespace_name='SIM002';
CREATE TABLESPACE SS DATAFILE 'D:\ORACLE\ORADATA\BSTO\SS.DBF' SIZE 1M;
SELECT T.tablespace_name, T.status from DBA_TABLESPACES T;
SELECT T.TABLESPACE_NAME,T.FILE_NAME from DBA_DATA_FILES T;
ALTER TABLESPACE SIM002 OFFLINE;
ALTER TABLESPACE SIM002 ONLINE;
SELECT T.os_username,
  T.username,
  T.terminal,
  DECODE(T.returncode,
  '0',
  'Connected',
  '1005',
  'failedNull',
  '1017',
  'failed'),
  to_char(t.timestamp, 'dd-mon-yy hh24:mi:ss'),
  to_char(t.logoff_time, 'dd-mon-yy hh24:mi:ss')
  from DBA_AUDIT_SESSION T;--³¢ÊԵǽÉó¼Æ
select t.action,t.name from audit_actions t;
select * from dba_audit_object;
select * from v$sesstat;
select a.sid,a.value "total