2. Addition and management of Oracle data files

0. Inquire about V$DATAFILE、DBA_DATA_FILES surface
   Inquire about V$DATAFILE

select name,file#,checkpoint_change# from v$datafile;

Inquire about DBA_DATA_FILES

select tablespace_name,autoextensible,file_name from dba_data_files;

1. by users Tablespace add data file users03.dbf, size 10mb

alter tablespace users add datafile 'D:\app\Snakewood\oradata\orcl\users03.dbf' size 10m;

2. by users Tablespace add data file user02.dbf, size 10mb, Automatic extension

alter tablespace users add datafile 'D:\app\Snakewood\oradata\orcl\user02.dbf' size 10m autoextend on;

3. by users Tablespace add data file users05.dbf, size 10mb, Maximum 50mb

alter tablespace users add datafile 'D:\app\Snakewood\oradata\orcl\users05.dbf' size 10m autoextend on maxsize 50m;

4. modify users In tablespace users03.dbf For automatic extension , Every expansion 5mb, Maximum 20mb

alter database datafile 'D:\app\Snakewood\oradata\orcl\users03.dbf' autoextend on next 5m maxsize 20m;

5. Change the database to archive

First , Query whether the database is currently in archive mode

select name,log_mode from v$database;

Close the database , stay mount Change the database to archive mode , Restart the database

Check the archive mode of the current database

6. take users01.dbf offline , Observe the changes of control documents
Before offline ：


After offline ：

alter database backup controlfile to trace as 'C:\Users\Snakewood\Desktop\offline.txt';

offline (offline) Return to online after (online):

7. take users03.dbf Renamed users003.dbf,users02 Move to e disc （ Try 3 Methods ）
take users03.dbf Renamed users003.dbf:
① Only right users03.dbf offline
First modify the file name to users003.dbf
Go offline

Modify the records in the control document

Reconnect the database and online

② Offline for tablespaces
Change the file name to users03.dbf
Go offline

① Only right users003.dbf offline

Modify the records in the control document

Re connect to the database

② Perform offline operations on tablespaces
Set the tablespace offline

Move users003 The new folder will be named users203
Modify the control file information

Bring tablespaces online