Oracle数据库迁移几种方式

来源：中国it实验室作者：佚名出处：巧巧读书 2008-05-08 进入讨论组

以下是引用片段：
　　WAIT #2: nam='Data file init write' ela= 13031 count=1 intr=256 timeout=-1 obj#=51706 tim=6068271611
　　WAIT #2: nam='Data file init write' ela= 118163 count=1 intr=256 timeout=-1 obj#=51706 tim=6068392491
　　WAIT #2: nam='Data file init write' ela= 94036 count=1 intr=256 timeout=-1 obj#=51706 tim=6068490286
　　WAIT #2: nam='Data file init write' ela= 52412 count=1 intr=256 timeout=-1 obj#=51706 tim=6068545333
　　WAIT #2: nam='Data file init write' ela= 4 count=0 intr=32 timeout=2147483647 obj#=51706 tim=6068545596
　　WAIT #2: nam='Data file init write' ela= 26 count=1 intr=32 timeout=2147483647 obj#=51706 tim=6068545641
　　WAIT #2: nam='Data file init write' ela= 101743 count=1 intr=256 timeout=-1 obj#=51706 tim=6068648487
　　WAIT #2: nam='Data file init write' ela= 44854 count=1 intr=256 timeout=-1 obj#=51706 tim=6068694281
　　WAIT #2: nam='Data file init write' ela= 52841 count=1 intr=256 timeout=-1 obj#=51706 tim=6068748054
　　WAIT #2: nam='Data file init write' ela= 48984 count=1 intr=256 timeout=-1 obj#=51706 tim=6068798310
　　WAIT #2: nam='Data file init write' ela= 3 count=0 intr=32 timeout=2147483647 obj#=51706 tim=6068798365
　　WAIT #2: nam='Data file init write' ela= 26 count=1 intr=32 timeout=2147483647 obj#=51706 tim=6068798409
　　WAIT #2: nam='Data file init write' ela= 101899 count=1 intr=256 timeout=-1 obj#=51706 tim=6068900931
　　WAIT #2: nam='Data file init write' ela= 21 count=-1 intr=32 timeout=2147483647 obj#=51706 tim=6068901053

　　测试数据库是Oracle10g 10.2.0.3，实际上这个等待事件也是从Oracle 10g开始引入的，用来标识表空间或数据文件扩展时的等待。

　　Oracle 需要将系统块格式化为Oracle数据块，然后才能提供数据库使用。

　　在这个流程处理中，Oracle经过如下三个步骤：

　　1.扩展数据文件

　　select file# from file$ where ts#=:1

　　2.更新用户空间限额

　　update tsq$ set blocks=:3,maxblocks=:4,grantor#=:5,priv1=:6,priv2=:7,priv3=:8 where ts#=:1 and user#=:2

　　3.扩展数据段

　　update seg$ set type#=:4,blocks=:5,extents=:6,minexts=:7,maxexts=:8,extsize=:9,extpct=:10,user#=:11,iniexts=:12,lists=decode(:13, 65535, NULL, :13),groups=decode(:14, 65535, NULL, :14), cachehint=:15, hwmincr=:16, spare1=DECODE(:17,0,NULL,:17),scanhint=:18 where ts#=:1 and file#=:2 and block#=:3

　　这就是Oracle10g中空间扩展时内部流程。