Как в Oracle Database установить значение поля по умолчанию

Для того чтобы сделать значение по умолчанию в Oracle есть три способа.

1. При создании таблицы:
CREATE TABLE test (name VARCHAR2(10), score NUMBER DEFAULT 0);

2. При добавлении столбца:
ALTER TABLE test ADD min_score NUMBER DEFAULT 0;

3. При редактировании столбца:
ALTER TABLE test ADD max_score NUMBER;
ALTER TABLE test MODIFY max_score DEFAULT 100;

Значение по умолчанию возвращается, если столбец содержит null-значение.
Например,
INSERT INTO test(name) VALUES('devtype');

Т.к. для столбцов score, min_score, max_score не было указано значение, то они будут содержать null, а возвращать будут значение по умолчанию.

[Err] ORA-30036: unable to extend segment by 8 in undo tablespace 'UNDO'

List tablespaces, size, free space, and percent free:

SELECT df.tablespace_name TABLESPACE, df.total_space TOTAL_SPACE,
fs.free_space FREE_SPACE, df.total_space_mb TOTAL_SPACE_MB,
(df.total_space_mb - fs.free_space_mb) USED_SPACE_MB,
fs.free_space_mb FREE_SPACE_MB,
ROUND(100 * (fs.free_space / df.total_space),2) PCT_FREE
FROM (SELECT tablespace_name, SUM(bytes) TOTAL_SPACE,
      ROUND(SUM(bytes) / 1048576) TOTAL_SPACE_MB
      FROM dba_data_files
      GROUP BY tablespace_name) df,
     (SELECT tablespace_name, SUM(bytes) FREE_SPACE,
       ROUND(SUM(bytes) / 1048576) FREE_SPACE_MB
       FROM dba_free_space
       GROUP BY tablespace_name) fs
WHERE df.tablespace_name = fs.tablespace_name(+)
ORDER BY fs.tablespace_name;

Смена порта по умолчанию 1521 в Oracle Server

1)
Win + R
notepad c:\oraclexe\app\oracle\product\10.2.0\server\NETWORK\ADMIN\listener.ora

SID_LIST_LISTENER =
  (SID_LIST =
    (SID_DESC =
      (SID_NAME = PLSExtProc)
      (ORACLE_HOME = C:\oraclexe\app\oracle\product\10.2.0\server)
      (PROGRAM = extproc)
    )
    (SID_DESC =
      (SID_NAME = CLRExtProc)
      (ORACLE_HOME = C:\oraclexe\app\oracle\product\10.2.0\server)
      (PROGRAM = extproc)
    )
  )

LISTENER =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC_FOR_XE))
      (ADDRESS = (PROTOCOL = TCP)(HOST = vista)(PORT = 11521))
    )
  )

DEFAULT_SERVICE_LISTENER = (XE)

2)
Win + R
notepad c:\oraclexe\app\oracle\product\10.2.0\server\NETWORK\ADMIN\tnsnames.ora

XE =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = vista)(PORT = 11521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = XE)
    )
  )

EXTPROC_CONNECTION_DATA =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC_FOR_XE))
    )
    (CONNECT_DATA =
      (SID = PLSExtProc)
      (PRESENTATION = RO)
    )
  )

ORACLR_CONNECTION_DATA =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC_FOR_XE))
    )
    (CONNECT_DATA =
      (SID = CLRExtProc)
      (PRESENTATION = RO)
    )
  )

3)

CONNECT SYSTEM
ALTER SYSTEM SET LOCAL_LISTENER = "(ADDRESS=(PROTOCOL=TCP)(HOST=127.0.0.1)(PORT=11521))";
ALTER SYSTEM REGISTER

4) Перезапустить службы OracleXETNSListener и OracleServiceXE


--
Change the default port 1521 in Oracle Server
Changing the Listener Port Number for Database Connection Requests 

Как изменить порт Oracle XE веб-интерфейса?

1) Открыть SQL Command Line:

2) Ввести:

CONNECT system
admin
BEGIN
DBMS_XDB.sethttpport('9090');
END;
/

--
How to change the Oracle XE web interface port