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通过一段时间的宣传,很多人都知道了ORACLE 12C可以实现在线move数据文件,使得我们从以前先offline相关文件任何系统级别mv,然后在rename file方便了很多。该功能的强大之处在于:
1.可以在库open的情况下move system表空间文件
2.对于其他表空间的数据文件move不用offline(意味着不用停业务)
3.大大简化了以前的操作步骤,很多初级dba对于原来的操作方法不理解,经常导致datafile最终异常
move datafile语法
move datafile之前操作
[oracle@xifenfei ~]$ sqlplus / as sysdba SQL*Plus: Release 12.1.0.0.2 Beta on Thu Dec 13 05:57:18 2012 Copyright (c) 1982, 2012, Oracle. All rights reserved. Connected to: Oracle Database 12c Enterprise Edition Release 12.1.0.0.2 - 64bit With the Partitioning, OLAP, Data Mining and Real Application Testing options SQL> select *from v$version; BANNER CON_ID -------------------------------------------------------------------------------- ---------- Oracle Database 12c Enterprise Edition Release 12.1.0.0.2 - 64bit 0 PL/SQL Release 12.1.0.0.2 0 CORE 12.1.0.0.2 0 TNS for Linux: Version 12.1.0.0.2 0 NLSRTL Version 12.1.0.0.2 0 SQL> alter session set container = ff; Session altered. SQL> show con_name; CON_NAME ------------------------------ FF SQL> col name for a65 SQL> set lines 134 SQL> select file#,name from v$datafile; FILE# NAME ---------- ----------------------------------------------------------------- 5 /u01/app/oracle/oradata/xifenfei/undotbs01.dbf 16 /u01/app/oracle/oradata/xifenfei/xffsystem01.dbf 17 /u01/app/oracle/oradata/xifenfei/xffsysaux01.dbf 18 /u01/app/oracle/oradata/xifenfei/xffSAMPLE_SCHEMA_users01.dbf 19 /u01/app/oracle/oradata/xifenfei/xffexample01.dbf SQL> !ls -l /u01/app/oracle/oradata/xifenfei/xff* -rw-r----- 1 oracle oinstall 365699072 Dec 13 05:55 /u01/app/oracle/oradata/xifenfei/xffexample01.dbf -rw-r----- 1 oracle oinstall 5251072 Dec 13 05:55 /u01/app/oracle/oradata/xifenfei/xffSAMPLE_SCHEMA_users01.dbf -rw-r----- 1 oracle oinstall 597696512 Dec 13 05:55 /u01/app/oracle/oradata/xifenfei/xffsysaux01.dbf -rw-r----- 1 oracle oinstall 283123712 Dec 13 05:55 /u01/app/oracle/oradata/xifenfei/xffsystem01.dbf -rw-r----- 1 oracle oinstall 20979712 Dec 12 21:28 /u01/app/oracle/oradata/xifenfei/xfftemp01.dbf /u01/app/oracle/oradata/xifenfei/xff: total 0
执行move datafile操作
SQL> select sid from v$mystat where rownum=1; SID ---------- 259 SQL> alter database move datafile 16 to '/u01/app/oracle/oradata/xifenfei/xff/system01.dbf'; Database altered. --new session SQL> select con_id,sid,event from v$session where sid=259; CON_ID SID EVENT ---------- ---------- ----------------------------------------------- 1 259 db file single write SQL> / CON_ID SID EVENT ---------- ---------- ------------------------------------------------ 1 259 db file sequential read SQL> / CON_ID SID EVENT ---------- ---------- ------------------------------------------------- 1 259 db file single write --通过新会话监控等待事件发现,move datafile的主要等待是 --db file sequential read和db file single write --继续执行move datafile SQL> alter database move datafile 2 '/u01/app/oracle/oradata/xifenfei/xffsysaux01.dbf' to 3 '/u01/app/oracle/oradata/xifenfei/xff/sysaux01.dbf'; Database altered. SQL> alter database move datafile 18 to 2 '/u01/app/oracle/oradata/xifenfei/xff/users01.dbf'; Database altered. SQL> alter database move datafile 19 to 2 '/u01/app/oracle/oradata/xifenfei/xff/example01.dbf'; Database altered. SQL> select file#,name from v$datafile; FILE# NAME ---------- ----------------------------------------------------------------- 5 /u01/app/oracle/oradata/xifenfei/undotbs01.dbf 16 /u01/app/oracle/oradata/xifenfei/xff/system01.dbf 17 /u01/app/oracle/oradata/xifenfei/xff/sysaux01.dbf 18 /u01/app/oracle/oradata/xifenfei/xff/users01.dbf 19 /u01/app/oracle/oradata/xifenfei/xff/example01.dbf
move datafile 也支持cdb中数据文件