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myisamchk
•
no endspace
Do not store endspace.
•
no endspace, not_always
Do not store endspace and do not do endspace compression for all values.
•
no endspace, no empty
Do not store endspace. Do not store empty values.
•
table-lookup
The column was converted to an ENUM.
•
zerofill(N)
The most significant
•
no zeros
Do not store zeros.
•
always zero
Zero values are stored using one bit.
•
Huff tree
The number of the Huffman tree associated with the column.
•
Bits
The number of bits used in the Huffman tree.
The
and
Huff tree
Bits
See
Section 4.6.5,
"myisampack
example of this information.
Example of
myisamchk -eiv
Checking MyISAM file: person
Data records:
306688
- check file-size
- check record delete-chain
No recordlinks
- check key delete-chain
block_size 1024:
- check index reference
- check data record references index: 1
Key:
1:
Keyblocks used:
- check data record references index: 2
Key:
2:
Keyblocks used:
- check data record references index: 3
Key:
3:
Keyblocks used:
Total:
Keyblocks used:
- check records and index
Records:
306688
Recordspace used:
Record blocks:
306688
Record data:
7934464
Lost space:
256512
— MyISAM Table-Maintenance Utility
bytes in the value are always 0 and are not stored.
N
fields are displayed if the table has been compressed with myisampack.
— Generate Compressed, Read-Only MyISAM
output:
Deleted blocks:
98%
Packed:
0%
99%
Packed:
97%
98%
Packed:
-14%
98%
Packed:
89%
references*** LOTS OF ROW NUMBERS DELETED ***
M.recordlength:
97% Empty space:
Delete blocks:
Deleted data:
Linkdata:
330
0
Max levels:
3
Max levels:
3
Max levels:
3
25
Packed:
2% Blocks/Record:
0
0
1156096
Tables", for an
83%
1.00
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