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PRM 扫描抽取lob大对象的关键

PRM 扫描抽取lob大对象的关键

直接对lob segment扫描后的抽取lob时,必要收集一些信息:

1、是blob还是clob
2、对于clob的字符集,单字节的或者UCS16,byte大小
3、chunk 大小,通过头部的page#获得
4、丢失的page

得到这些信息: data_object_id,lobid, fatpageno (chunk#), version wrap, vsn base, ts#, file#, block#

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