Don't argue / for other people's weaknesses./ Don't argue / for your own.
/ When you make a mistake,/ admit it,/ correct it,/ and learn from it / immediately.



文件系統OMF
文件系統默認不使用OMF，默認是DB_CREATE_FILE_DEST參數值為NULL，也就是禁用OMF;
(1)
SQL> show parameter db_create_file_dest

NAME???????????????????????????????? TYPE??????? VALUE
------------------------------------ ----------- ------------------------------
db_create_file_dest????????????????? string
(2)
創建一個表空間，必須要指定數據文件名，也就是必須要加上datafile子句才可以，否則會報錯。
(3)刪除表空間時，磁盤文件不會自動刪除，必須使用including contents and datafiles才能同時刪除，或者
os的rm命令手工刪除。
SQL>drop tablespace test including contents and datafiles;

(4)文件系統使用OMF時
SQL>alter system set db_create_file_dest='/backup' scope=both;
啟用OMF后，創建表空間就不用指定文件名稱。
SQL>create tablespace test;
ASM上的OMF
ASM FILE在ASM磁盤組上也是以OMF方式進行存放的，因此ASM的存放路徑和文件命是遵循格式：
+diskgroup_name/database_name/database file type/tag_name.file_number.incarnation.


添加ASM alias
SQL>create tablespace omf datafile '+data' size 2m;
SQL>select name from v$datafile;
添加ASM ALIAS
EXPORT ORACLE_SID=+ASM1
SQL>alter diskgroup data add alias '+data/omf.dbf' for '+DATA/WXXRZXM/datafile/omf.273.660074819';
查看ASM ALIAS別名
select *
? from (select file_number,
?????????????? file_incarnation,
?????????????? '+' || gname || sys_connect_by_path(aname, '/') as full_alias_path
????????? from (select a.file_number????? file_number,
?????????????????????? a.file_incarnation file_incarnation,
?????????????????????? g.name???????????? gname,
?????????????????????? a.parent_index???? pindex,
?????????????????????? a.name???????????? aname,
?????????????????????? a.reference_index? rindex
????????????????? from v$asm_alias a, v$asm_diskgroup g
???????????????? where a.group_number = g.group_number)
???????? start with (mod(pindex, power(2, 24))) = 0
??????? connect by prior rindex = pindex
???????? order by 1, 2) a
?where file_incarnation = &fi;

轉載于:https://www.cnblogs.com/alang85/archive/2011/09/26/2192200.html

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