Oracle Internals Notes

Cache Layer Block Types

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

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1Undo header block (limited extents)all, but superseded by type 14 from 8.0 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3Save undo header block (limited extents)all, but superseded by type 15 from 8.0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5Data segment header block (limited extents, no freelist groups)all, but superseded by type 16 from 8.0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10Free list blockall, but superseded by type 22 from 8.0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12Data segment header block (limited extents, with freelist groups)all, but superseded by type 17 from 8.0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


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12-Oct-2007 22:22
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