Archive for 一月, 2006

oracle rowid

Published by
wanghai
一月 19, 2006 in Oracle. 4 Comments

搞oracle的人都很清楚rowid这个东西，rowid就是唯一标志记录物理位置的一个id，在oracle 8版本以前，rowid由file#+block#+row#组成，占用6个bytes的空间，10 bit 的 file# ，22bit 的 block# ，16 bit 的 row#。
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what is data_object_id?

Published by
wanghai
一月 15, 2006 in Oracle. 5 Comments

前些天有人问data_object_id究竟是个什么东东，既然有了object_id那还要data_object_id干吗？
Continue reading ‘what is data_object_id?’

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