понедельник, 17 января 2011 г.

Заметки по Oracle RDBMS

Подключение к СУБД через sqlplus с использованием Easy connnect:
 $ sqlplus userName/userPass@serverHost:serverPort/serviceName  
Просмотр информации о свободном пространстве в табличных пространствах:
 SELECT /* + RULE */ df.tablespace_name "Tablespace",  
     df.bytes / (1024 * 1024) "Size (MB)",  
     SUM(fs.bytes) / (1024 * 1024) "Free (MB)",  
     Nvl(Round(SUM(fs.bytes) * 100 / df.bytes),1) "% Free",  
     Round((df.bytes - SUM(fs.bytes)) * 100 / df.bytes) "% Used"  
  FROM dba_free_space fs,  
     (SELECT tablespace_name,SUM(bytes) bytes  
      FROM dba_data_files  
      GROUP BY tablespace_name) df  
  WHERE fs.tablespace_name (+) = df.tablespace_name  
  GROUP BY df.tablespace_name,df.bytes  
 UNION ALL  
 SELECT /* + RULE */ df.tablespace_name "Tablespace",  
     fs.bytes / (1024 * 1024) "Size (MB)",  
     SUM(df.bytes_free) / (1024 * 1024) "Free (MB)",  
     Nvl(Round((SUM(fs.bytes) - df.bytes_used) * 100 / fs.bytes), 1) "% Free",  
     Round((SUM(fs.bytes) - df.bytes_free) * 100 / fs.bytes) "% Used"  
  FROM dba_temp_files fs,  
     (SELECT tablespace_name,bytes_free,bytes_used  
      FROM v$temp_space_header  
      GROUP BY tablespace_name,bytes_free,bytes_used) df  
  WHERE fs.tablespace_name (+) = df.tablespace_name  
  GROUP BY df.tablespace_name,fs.bytes,df.bytes_free,df.bytes_used  
  ORDER BY 4 DESC;  
'Завершить' все неактивные сессии:
 begin     
   -- ALTER SYSTEM ENABLE RESTRICTED SESSION;  
   for x in (   
       select Sid, Serial#, machine, program   
       from v$session   
       where  status='INACTIVE'   
     ) loop   
     execute immediate 'Alter System Kill Session '''|| x.Sid   
            || ',' || x.Serial# || ''' IMMEDIATE';   
   end loop;   
 end;   
Сделать бессрочным срок действия пароля пользователя:
 ALTER PROFILE DEFAULT LIMIT PASSWORD_LIFE_TIME UNLIMITED;  
Увеличить размер табличного пространства:
 ALTER DATABASE DATAFILE '/u02/oracle/rbdb1/stuff01.dbf' RESIZE 100M;  
Поиск дубликатов в таблице:
 SELECT column_name, COUNT(column_name)
 FROM table_name
 GROUP BY column_name
 HAVING COUNT (column_name) > 1
Создание DBLink с использованием Easy connnect:
CREATE PUBLIC DATABASE LINK dbLinkName
   CONNECT TO userName identified by userPassword
   USING '(DESCRIPTION =    
    (ADDRESS = (PROTOCOL = TCP)(HOST = hostname)(PORT = portNumber))    
    (CONNECT_DATA =      
    (SERVICE_NAME = serviceName)))';


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