Help understand about values retrieved by Tom Kyte script for my LOB segment

I have the LOB segment. When I use Tom Kyte show_space script

()https://asktom.oracle.com/pls/apex/f?p=100:11:0:P11_QUESTION_ID:14339684180676) have this output:

Unformatted blocks...             107

FS1 Blocks (0-25)...               0

FS2 Blocks (25-50)...               0

FS3 Blocks (50-75)...               0

FS4 Blocks (75-100)...               0

Complete blocks...         859 438

Total blocks...       1 746 304

Total number of bytes...  14,305,722,368

Total MB...          13 643

Unused blocks...               0

Unused bytes...               0

Used in last Ext FileId...               5

Used in last Ext BlockId...       1 261 056

Used in last block...             128

I have only full blocks = 859 438, but Total of blocks = 1 746 304 why so?

Looks like you chunk's size 16 k - Oracle seems to watch only the headers of piece in this code; so you expect the segment number raw blocks to be twice the space 'blocks', as this report if you are using a size of 8 KB block and a fragment of 16 k size.

Concerning

Jonathan Lewis

Tags: Database

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