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Cache Layer Block Types

上一篇 / 下一篇 2007-02-13 00:00:00 / 个人分类：RDBMS

This is a list of the block type numbers found in cache layer block headers.

Code	Block Type	Versions
1	Undo header block (limited extents)	all, but superseded by type 14 from 8.0
2	Undo data block	all
3	Save undo header block (limited extents)	all, but superseded by type 15 from 8.0
4	Save undo data block	all
5	Data segment header block (limited extents, no freelist groups)	all, but superseded by type 16 from 8.0
6	Table/cluster/index segment data block	all
7	Temporary segment data block	all
8	Sort key block	all
9	Sort run block	all
10	Free list block	all, but superseded by type 22 from 8.0
11	Data file header block	all
12	Data segment header block (limited extents, with freelist groups)	all, but superseded by type 17 from 8.0
13	Compatibility segment	all
14	Undo header block (unlimited extents)	from 7.3
15	Save undo header block (unlimited extents)	from 7.3
16	Data segment header block (unlimited extents, no freelist groups)	from 7.3
17	Data segment header block (unlimited extents, with freelist groups)	from 7.3
18	Extent map block	from 7.3
19	Backup set piece header	from 8.0
20	Backup set directory block	from 8.0
21	Controlfile block	from 8.0
22	Free list block with free block count	from 8.0
23	LOB segment header block	from 8.0
24	LOB segment freelist block	from 8.0
25	LOB segment space usage index block	from 8.0
26	LOB segment space usage bitmap block	from 8.0
27	LOB segment chunk data block	from 8.0
28	don't know
29	LMT space map header block	from 8.1
30	LMT space map block	from 8.1
31	don't know
32	ASSM level 1 bitmap block	from 9.0
33	ASSM level 2 bitmap block	from 9.0
34	ASSM level 3 bitmap block	from 9.0
35	ASSM segment header block	from 9.0
36	ASSM extent map block	from 9.0
37	don't know
38	System managed undo header block	from 9.0